#define DEBUG_TYPE "dagcombine"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/DerivedTypes.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/PseudoSourceValue.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetFrameInfo.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/MathExtras.h"
#include <algorithm>
#include <set>
using namespace llvm;
STATISTIC(NodesCombined , "Number of dag nodes combined");
STATISTIC(PreIndexedNodes , "Number of pre-indexed nodes created");
STATISTIC(PostIndexedNodes, "Number of post-indexed nodes created");
namespace {
static cl::opt<bool>
CombinerAA("combiner-alias-analysis", cl::Hidden,
cl::desc("Turn on alias analysis during testing"));
static cl::opt<bool>
CombinerGlobalAA("combiner-global-alias-analysis", cl::Hidden,
cl::desc("Include global information in alias analysis"));
class VISIBILITY_HIDDEN DAGCombiner {
SelectionDAG &DAG;
const TargetLowering &TLI;
CombineLevel Level;
CodeGenOpt::Level OptLevel;
bool LegalOperations;
bool LegalTypes;
std::vector<SDNode*> WorkList;
AliasAnalysis &AA;
void AddUsersToWorkList(SDNode *N) {
for (SDNode::use_iterator UI = N->use_begin(), UE = N->use_end();
UI != UE; ++UI)
AddToWorkList(*UI);
}
SDValue visit(SDNode *N);
public:
void AddToWorkList(SDNode *N) {
removeFromWorkList(N);
WorkList.push_back(N);
}
void removeFromWorkList(SDNode *N) {
WorkList.erase(std::remove(WorkList.begin(), WorkList.end(), N),
WorkList.end());
}
SDValue CombineTo(SDNode *N, const SDValue *To, unsigned NumTo,
bool AddTo = true);
SDValue CombineTo(SDNode *N, SDValue Res, bool AddTo = true) {
return CombineTo(N, &Res, 1, AddTo);
}
SDValue CombineTo(SDNode *N, SDValue Res0, SDValue Res1,
bool AddTo = true) {
SDValue To[] = { Res0, Res1 };
return CombineTo(N, To, 2, AddTo);
}
void CommitTargetLoweringOpt(const TargetLowering::TargetLoweringOpt &TLO);
private:
bool SimplifyDemandedBits(SDValue Op) {
APInt Demanded = APInt::getAllOnesValue(Op.getValueSizeInBits());
return SimplifyDemandedBits(Op, Demanded);
}
bool SimplifyDemandedBits(SDValue Op, const APInt &Demanded);
bool CombineToPreIndexedLoadStore(SDNode *N);
bool CombineToPostIndexedLoadStore(SDNode *N);
SDValue combine(SDNode *N);
SDValue visitTokenFactor(SDNode *N);
SDValue visitMERGE_VALUES(SDNode *N);
SDValue visitADD(SDNode *N);
SDValue visitSUB(SDNode *N);
SDValue visitADDC(SDNode *N);
SDValue visitADDE(SDNode *N);
SDValue visitMUL(SDNode *N);
SDValue visitSDIV(SDNode *N);
SDValue visitUDIV(SDNode *N);
SDValue visitSREM(SDNode *N);
SDValue visitUREM(SDNode *N);
SDValue visitMULHU(SDNode *N);
SDValue visitMULHS(SDNode *N);
SDValue visitSMUL_LOHI(SDNode *N);
SDValue visitUMUL_LOHI(SDNode *N);
SDValue visitSDIVREM(SDNode *N);
SDValue visitUDIVREM(SDNode *N);
SDValue visitAND(SDNode *N);
SDValue visitOR(SDNode *N);
SDValue visitXOR(SDNode *N);
SDValue SimplifyVBinOp(SDNode *N);
SDValue visitSHL(SDNode *N);
SDValue visitSRA(SDNode *N);
SDValue visitSRL(SDNode *N);
SDValue visitCTLZ(SDNode *N);
SDValue visitCTTZ(SDNode *N);
SDValue visitCTPOP(SDNode *N);
SDValue visitSELECT(SDNode *N);
SDValue visitSELECT_CC(SDNode *N);
SDValue visitSETCC(SDNode *N);
SDValue visitSIGN_EXTEND(SDNode *N);
SDValue visitZERO_EXTEND(SDNode *N);
SDValue visitANY_EXTEND(SDNode *N);
SDValue visitSIGN_EXTEND_INREG(SDNode *N);
SDValue visitTRUNCATE(SDNode *N);
SDValue visitBIT_CONVERT(SDNode *N);
SDValue visitBUILD_PAIR(SDNode *N);
SDValue visitFADD(SDNode *N);
SDValue visitFSUB(SDNode *N);
SDValue visitFMUL(SDNode *N);
SDValue visitFDIV(SDNode *N);
SDValue visitFREM(SDNode *N);
SDValue visitFCOPYSIGN(SDNode *N);
SDValue visitSINT_TO_FP(SDNode *N);
SDValue visitUINT_TO_FP(SDNode *N);
SDValue visitFP_TO_SINT(SDNode *N);
SDValue visitFP_TO_UINT(SDNode *N);
SDValue visitFP_ROUND(SDNode *N);
SDValue visitFP_ROUND_INREG(SDNode *N);
SDValue visitFP_EXTEND(SDNode *N);
SDValue visitFNEG(SDNode *N);
SDValue visitFABS(SDNode *N);
SDValue visitBRCOND(SDNode *N);
SDValue visitBR_CC(SDNode *N);
SDValue visitLOAD(SDNode *N);
SDValue visitSTORE(SDNode *N);
SDValue visitINSERT_VECTOR_ELT(SDNode *N);
SDValue visitEXTRACT_VECTOR_ELT(SDNode *N);
SDValue visitBUILD_VECTOR(SDNode *N);
SDValue visitCONCAT_VECTORS(SDNode *N);
SDValue visitVECTOR_SHUFFLE(SDNode *N);
SDValue XformToShuffleWithZero(SDNode *N);
SDValue ReassociateOps(unsigned Opc, DebugLoc DL, SDValue LHS, SDValue RHS);
SDValue visitShiftByConstant(SDNode *N, unsigned Amt);
bool SimplifySelectOps(SDNode *SELECT, SDValue LHS, SDValue RHS);
SDValue SimplifyBinOpWithSameOpcodeHands(SDNode *N);
SDValue SimplifySelect(DebugLoc DL, SDValue N0, SDValue N1, SDValue N2);
SDValue SimplifySelectCC(DebugLoc DL, SDValue N0, SDValue N1, SDValue N2,
SDValue N3, ISD::CondCode CC,
bool NotExtCompare = false);
SDValue SimplifySetCC(MVT VT, SDValue N0, SDValue N1, ISD::CondCode Cond,
DebugLoc DL, bool foldBooleans = true);
SDValue SimplifyNodeWithTwoResults(SDNode *N, unsigned LoOp,
unsigned HiOp);
SDValue CombineConsecutiveLoads(SDNode *N, MVT VT);
SDValue ConstantFoldBIT_CONVERTofBUILD_VECTOR(SDNode *, MVT);
SDValue BuildSDIV(SDNode *N);
SDValue BuildUDIV(SDNode *N);
SDNode *MatchRotate(SDValue LHS, SDValue RHS, DebugLoc DL);
SDValue ReduceLoadWidth(SDNode *N);
SDValue GetDemandedBits(SDValue V, const APInt &Mask);
void GatherAllAliases(SDNode *N, SDValue OriginalChain,
SmallVector<SDValue, 8> &Aliases);
bool isAlias(SDValue Ptr1, int64_t Size1,
const Value *SrcValue1, int SrcValueOffset1,
SDValue Ptr2, int64_t Size2,
const Value *SrcValue2, int SrcValueOffset2) const;
bool FindAliasInfo(SDNode *N,
SDValue &Ptr, int64_t &Size,
const Value *&SrcValue, int &SrcValueOffset) const;
SDValue FindBetterChain(SDNode *N, SDValue Chain);
MVT getShiftAmountTy() {
return LegalTypes ? TLI.getShiftAmountTy() : TLI.getPointerTy();
}
public:
DAGCombiner(SelectionDAG &D, AliasAnalysis &A, CodeGenOpt::Level OL)
: DAG(D),
TLI(D.getTargetLoweringInfo()),
Level(Unrestricted),
OptLevel(OL),
LegalOperations(false),
LegalTypes(false),
AA(A) {}
void Run(CombineLevel AtLevel);
};
}
namespace {
class VISIBILITY_HIDDEN WorkListRemover :
public SelectionDAG::DAGUpdateListener {
DAGCombiner &DC;
public:
explicit WorkListRemover(DAGCombiner &dc) : DC(dc) {}
virtual void NodeDeleted(SDNode *N, SDNode *E) {
DC.removeFromWorkList(N);
}
virtual void NodeUpdated(SDNode *N) {
}
};
}
void TargetLowering::DAGCombinerInfo::AddToWorklist(SDNode *N) {
((DAGCombiner*)DC)->AddToWorkList(N);
}
SDValue TargetLowering::DAGCombinerInfo::
CombineTo(SDNode *N, const std::vector<SDValue> &To, bool AddTo) {
return ((DAGCombiner*)DC)->CombineTo(N, &To[0], To.size(), AddTo);
}
SDValue TargetLowering::DAGCombinerInfo::
CombineTo(SDNode *N, SDValue Res, bool AddTo) {
return ((DAGCombiner*)DC)->CombineTo(N, Res, AddTo);
}
SDValue TargetLowering::DAGCombinerInfo::
CombineTo(SDNode *N, SDValue Res0, SDValue Res1, bool AddTo) {
return ((DAGCombiner*)DC)->CombineTo(N, Res0, Res1, AddTo);
}
void TargetLowering::DAGCombinerInfo::
CommitTargetLoweringOpt(const TargetLowering::TargetLoweringOpt &TLO) {
return ((DAGCombiner*)DC)->CommitTargetLoweringOpt(TLO);
}
static char isNegatibleForFree(SDValue Op, bool LegalOperations,
unsigned Depth = 0) {
if (Op.getValueType() == MVT::ppcf128)
return 0;
if (Op.getOpcode() == ISD::FNEG) return 2;
if (!Op.hasOneUse()) return 0;
if (Depth > 6) return 0;
switch (Op.getOpcode()) {
default: return false;
case ISD::ConstantFP:
return LegalOperations ? 0 : 1;
case ISD::FADD:
if (!UnsafeFPMath) return 0;
if (char V = isNegatibleForFree(Op.getOperand(0), LegalOperations, Depth+1))
return V;
return isNegatibleForFree(Op.getOperand(1), LegalOperations, Depth+1);
case ISD::FSUB:
if (!UnsafeFPMath) return 0;
return 1;
case ISD::FMUL:
case ISD::FDIV:
if (HonorSignDependentRoundingFPMath()) return 0;
if (char V = isNegatibleForFree(Op.getOperand(0), LegalOperations, Depth+1))
return V;
return isNegatibleForFree(Op.getOperand(1), LegalOperations, Depth+1);
case ISD::FP_EXTEND:
case ISD::FP_ROUND:
case ISD::FSIN:
return isNegatibleForFree(Op.getOperand(0), LegalOperations, Depth+1);
}
}
static SDValue GetNegatedExpression(SDValue Op, SelectionDAG &DAG,
bool LegalOperations, unsigned Depth = 0) {
if (Op.getOpcode() == ISD::FNEG) return Op.getOperand(0);
assert(Op.hasOneUse() && "Unknown reuse!");
assert(Depth <= 6 && "GetNegatedExpression doesn't match isNegatibleForFree");
switch (Op.getOpcode()) {
default: assert(0 && "Unknown code");
case ISD::ConstantFP: {
APFloat V = cast<ConstantFPSDNode>(Op)->getValueAPF();
V.changeSign();
return DAG.getConstantFP(V, Op.getValueType());
}
case ISD::FADD:
assert(UnsafeFPMath);
if (isNegatibleForFree(Op.getOperand(0), LegalOperations, Depth+1))
return DAG.getNode(ISD::FSUB, Op.getDebugLoc(), Op.getValueType(),
GetNegatedExpression(Op.getOperand(0), DAG,
LegalOperations, Depth+1),
Op.getOperand(1));
return DAG.getNode(ISD::FSUB, Op.getDebugLoc(), Op.getValueType(),
GetNegatedExpression(Op.getOperand(1), DAG,
LegalOperations, Depth+1),
Op.getOperand(0));
case ISD::FSUB:
assert(UnsafeFPMath);
if (ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(Op.getOperand(0)))
if (N0CFP->getValueAPF().isZero())
return Op.getOperand(1);
return DAG.getNode(ISD::FSUB, Op.getDebugLoc(), Op.getValueType(),
Op.getOperand(1), Op.getOperand(0));
case ISD::FMUL:
case ISD::FDIV:
assert(!HonorSignDependentRoundingFPMath());
if (isNegatibleForFree(Op.getOperand(0), LegalOperations, Depth+1))
return DAG.getNode(Op.getOpcode(), Op.getDebugLoc(), Op.getValueType(),
GetNegatedExpression(Op.getOperand(0), DAG,
LegalOperations, Depth+1),
Op.getOperand(1));
return DAG.getNode(Op.getOpcode(), Op.getDebugLoc(), Op.getValueType(),
Op.getOperand(0),
GetNegatedExpression(Op.getOperand(1), DAG,
LegalOperations, Depth+1));
case ISD::FP_EXTEND:
case ISD::FSIN:
return DAG.getNode(Op.getOpcode(), Op.getDebugLoc(), Op.getValueType(),
GetNegatedExpression(Op.getOperand(0), DAG,
LegalOperations, Depth+1));
case ISD::FP_ROUND:
return DAG.getNode(ISD::FP_ROUND, Op.getDebugLoc(), Op.getValueType(),
GetNegatedExpression(Op.getOperand(0), DAG,
LegalOperations, Depth+1),
Op.getOperand(1));
}
}
static bool isSetCCEquivalent(SDValue N, SDValue &LHS, SDValue &RHS,
SDValue &CC) {
if (N.getOpcode() == ISD::SETCC) {
LHS = N.getOperand(0);
RHS = N.getOperand(1);
CC = N.getOperand(2);
return true;
}
if (N.getOpcode() == ISD::SELECT_CC &&
N.getOperand(2).getOpcode() == ISD::Constant &&
N.getOperand(3).getOpcode() == ISD::Constant &&
cast<ConstantSDNode>(N.getOperand(2))->getAPIntValue() == 1 &&
cast<ConstantSDNode>(N.getOperand(3))->isNullValue()) {
LHS = N.getOperand(0);
RHS = N.getOperand(1);
CC = N.getOperand(4);
return true;
}
return false;
}
static bool isOneUseSetCC(SDValue N) {
SDValue N0, N1, N2;
if (isSetCCEquivalent(N, N0, N1, N2) && N.getNode()->hasOneUse())
return true;
return false;
}
SDValue DAGCombiner::ReassociateOps(unsigned Opc, DebugLoc DL,
SDValue N0, SDValue N1) {
MVT VT = N0.getValueType();
if (N0.getOpcode() == Opc && isa<ConstantSDNode>(N0.getOperand(1))) {
if (isa<ConstantSDNode>(N1)) {
SDValue OpNode =
DAG.FoldConstantArithmetic(Opc, VT,
cast<ConstantSDNode>(N0.getOperand(1)),
cast<ConstantSDNode>(N1));
return DAG.getNode(Opc, DL, VT, N0.getOperand(0), OpNode);
} else if (N0.hasOneUse()) {
SDValue OpNode = DAG.getNode(Opc, N0.getDebugLoc(), VT,
N0.getOperand(0), N1);
AddToWorkList(OpNode.getNode());
return DAG.getNode(Opc, DL, VT, OpNode, N0.getOperand(1));
}
}
if (N1.getOpcode() == Opc && isa<ConstantSDNode>(N1.getOperand(1))) {
if (isa<ConstantSDNode>(N0)) {
SDValue OpNode =
DAG.FoldConstantArithmetic(Opc, VT,
cast<ConstantSDNode>(N1.getOperand(1)),
cast<ConstantSDNode>(N0));
return DAG.getNode(Opc, DL, VT, N1.getOperand(0), OpNode);
} else if (N1.hasOneUse()) {
SDValue OpNode = DAG.getNode(Opc, N0.getDebugLoc(), VT,
N1.getOperand(0), N0);
AddToWorkList(OpNode.getNode());
return DAG.getNode(Opc, DL, VT, OpNode, N1.getOperand(1));
}
}
return SDValue();
}
SDValue DAGCombiner::CombineTo(SDNode *N, const SDValue *To, unsigned NumTo,
bool AddTo) {
assert(N->getNumValues() == NumTo && "Broken CombineTo call!");
++NodesCombined;
DOUT << "\nReplacing.1 "; DEBUG(N->dump(&DAG));
DOUT << "\nWith: "; DEBUG(To[0].getNode()->dump(&DAG));
DOUT << " and " << NumTo-1 << " other values\n";
DEBUG(for (unsigned i = 0, e = NumTo; i != e; ++i)
assert(N->getValueType(i) == To[i].getValueType() &&
"Cannot combine value to value of different type!"));
WorkListRemover DeadNodes(*this);
DAG.ReplaceAllUsesWith(N, To, &DeadNodes);
if (AddTo) {
for (unsigned i = 0, e = NumTo; i != e; ++i) {
if (To[i].getNode()) {
AddToWorkList(To[i].getNode());
AddUsersToWorkList(To[i].getNode());
}
}
}
if (N->use_empty()) {
removeFromWorkList(N);
DAG.DeleteNode(N);
}
return SDValue(N, 0);
}
void
DAGCombiner::CommitTargetLoweringOpt(const TargetLowering::TargetLoweringOpt &
TLO) {
WorkListRemover DeadNodes(*this);
DAG.ReplaceAllUsesOfValueWith(TLO.Old, TLO.New, &DeadNodes);
AddToWorkList(TLO.New.getNode());
AddUsersToWorkList(TLO.New.getNode());
if (TLO.Old.getNode()->use_empty()) {
removeFromWorkList(TLO.Old.getNode());
for (unsigned i = 0, e = TLO.Old.getNode()->getNumOperands(); i != e; ++i)
if (TLO.Old.getNode()->getOperand(i).getNode()->hasOneUse())
AddToWorkList(TLO.Old.getNode()->getOperand(i).getNode());
DAG.DeleteNode(TLO.Old.getNode());
}
}
bool DAGCombiner::SimplifyDemandedBits(SDValue Op, const APInt &Demanded) {
TargetLowering::TargetLoweringOpt TLO(DAG);
APInt KnownZero, KnownOne;
if (!TLI.SimplifyDemandedBits(Op, Demanded, KnownZero, KnownOne, TLO))
return false;
AddToWorkList(Op.getNode());
++NodesCombined;
DOUT << "\nReplacing.2 "; DEBUG(TLO.Old.getNode()->dump(&DAG));
DOUT << "\nWith: "; DEBUG(TLO.New.getNode()->dump(&DAG));
DOUT << '\n';
CommitTargetLoweringOpt(TLO);
return true;
}
void DAGCombiner::Run(CombineLevel AtLevel) {
Level = AtLevel;
LegalOperations = Level >= NoIllegalOperations;
LegalTypes = Level >= NoIllegalTypes;
WorkList.reserve(DAG.allnodes_size());
for (SelectionDAG::allnodes_iterator I = DAG.allnodes_begin(),
E = DAG.allnodes_end(); I != E; ++I)
WorkList.push_back(I);
HandleSDNode Dummy(DAG.getRoot());
DAG.setRoot(SDValue());
while (!WorkList.empty()) {
SDNode *N = WorkList.back();
WorkList.pop_back();
if (N->use_empty() && N != &Dummy) {
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
AddToWorkList(N->getOperand(i).getNode());
DAG.DeleteNode(N);
continue;
}
SDValue RV = combine(N);
if (RV.getNode() == 0)
continue;
++NodesCombined;
if (RV.getNode() == N)
continue;
assert(N->getOpcode() != ISD::DELETED_NODE &&
RV.getNode()->getOpcode() != ISD::DELETED_NODE &&
"Node was deleted but visit returned new node!");
DOUT << "\nReplacing.3 "; DEBUG(N->dump(&DAG));
DOUT << "\nWith: "; DEBUG(RV.getNode()->dump(&DAG));
DOUT << '\n';
WorkListRemover DeadNodes(*this);
if (N->getNumValues() == RV.getNode()->getNumValues())
DAG.ReplaceAllUsesWith(N, RV.getNode(), &DeadNodes);
else {
assert(N->getValueType(0) == RV.getValueType() &&
N->getNumValues() == 1 && "Type mismatch");
SDValue OpV = RV;
DAG.ReplaceAllUsesWith(N, &OpV, &DeadNodes);
}
AddToWorkList(RV.getNode());
AddUsersToWorkList(RV.getNode());
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
AddToWorkList(N->getOperand(i).getNode());
if (N->use_empty()) {
removeFromWorkList(N);
DAG.DeleteNode(N);
}
}
DAG.setRoot(Dummy.getValue());
}
SDValue DAGCombiner::visit(SDNode *N) {
switch(N->getOpcode()) {
default: break;
case ISD::TokenFactor: return visitTokenFactor(N);
case ISD::MERGE_VALUES: return visitMERGE_VALUES(N);
case ISD::ADD: return visitADD(N);
case ISD::SUB: return visitSUB(N);
case ISD::ADDC: return visitADDC(N);
case ISD::ADDE: return visitADDE(N);
case ISD::MUL: return visitMUL(N);
case ISD::SDIV: return visitSDIV(N);
case ISD::UDIV: return visitUDIV(N);
case ISD::SREM: return visitSREM(N);
case ISD::UREM: return visitUREM(N);
case ISD::MULHU: return visitMULHU(N);
case ISD::MULHS: return visitMULHS(N);
case ISD::SMUL_LOHI: return visitSMUL_LOHI(N);
case ISD::UMUL_LOHI: return visitUMUL_LOHI(N);
case ISD::SDIVREM: return visitSDIVREM(N);
case ISD::UDIVREM: return visitUDIVREM(N);
case ISD::AND: return visitAND(N);
case ISD::OR: return visitOR(N);
case ISD::XOR: return visitXOR(N);
case ISD::SHL: return visitSHL(N);
case ISD::SRA: return visitSRA(N);
case ISD::SRL: return visitSRL(N);
case ISD::CTLZ: return visitCTLZ(N);
case ISD::CTTZ: return visitCTTZ(N);
case ISD::CTPOP: return visitCTPOP(N);
case ISD::SELECT: return visitSELECT(N);
case ISD::SELECT_CC: return visitSELECT_CC(N);
case ISD::SETCC: return visitSETCC(N);
case ISD::SIGN_EXTEND: return visitSIGN_EXTEND(N);
case ISD::ZERO_EXTEND: return visitZERO_EXTEND(N);
case ISD::ANY_EXTEND: return visitANY_EXTEND(N);
case ISD::SIGN_EXTEND_INREG: return visitSIGN_EXTEND_INREG(N);
case ISD::TRUNCATE: return visitTRUNCATE(N);
case ISD::BIT_CONVERT: return visitBIT_CONVERT(N);
case ISD::BUILD_PAIR: return visitBUILD_PAIR(N);
case ISD::FADD: return visitFADD(N);
case ISD::FSUB: return visitFSUB(N);
case ISD::FMUL: return visitFMUL(N);
case ISD::FDIV: return visitFDIV(N);
case ISD::FREM: return visitFREM(N);
case ISD::FCOPYSIGN: return visitFCOPYSIGN(N);
case ISD::SINT_TO_FP: return visitSINT_TO_FP(N);
case ISD::UINT_TO_FP: return visitUINT_TO_FP(N);
case ISD::FP_TO_SINT: return visitFP_TO_SINT(N);
case ISD::FP_TO_UINT: return visitFP_TO_UINT(N);
case ISD::FP_ROUND: return visitFP_ROUND(N);
case ISD::FP_ROUND_INREG: return visitFP_ROUND_INREG(N);
case ISD::FP_EXTEND: return visitFP_EXTEND(N);
case ISD::FNEG: return visitFNEG(N);
case ISD::FABS: return visitFABS(N);
case ISD::BRCOND: return visitBRCOND(N);
case ISD::BR_CC: return visitBR_CC(N);
case ISD::LOAD: return visitLOAD(N);
case ISD::STORE: return visitSTORE(N);
case ISD::INSERT_VECTOR_ELT: return visitINSERT_VECTOR_ELT(N);
case ISD::EXTRACT_VECTOR_ELT: return visitEXTRACT_VECTOR_ELT(N);
case ISD::BUILD_VECTOR: return visitBUILD_VECTOR(N);
case ISD::CONCAT_VECTORS: return visitCONCAT_VECTORS(N);
case ISD::VECTOR_SHUFFLE: return visitVECTOR_SHUFFLE(N);
}
return SDValue();
}
SDValue DAGCombiner::combine(SDNode *N) {
SDValue RV = visit(N);
if (RV.getNode() == 0) {
assert(N->getOpcode() != ISD::DELETED_NODE &&
"Node was deleted but visit returned NULL!");
if (N->getOpcode() >= ISD::BUILTIN_OP_END ||
TLI.hasTargetDAGCombine((ISD::NodeType)N->getOpcode())) {
TargetLowering::DAGCombinerInfo
DagCombineInfo(DAG, Level == Unrestricted, false, this);
RV = TLI.PerformDAGCombine(N, DagCombineInfo);
}
}
if (RV.getNode() == 0 &&
SelectionDAG::isCommutativeBinOp(N->getOpcode()) &&
N->getNumValues() == 1) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
if (isa<ConstantSDNode>(N0) || !isa<ConstantSDNode>(N1)) {
SDValue Ops[] = { N1, N0 };
SDNode *CSENode = DAG.getNodeIfExists(N->getOpcode(), N->getVTList(),
Ops, 2);
if (CSENode)
return SDValue(CSENode, 0);
}
}
return RV;
}
static SDValue getInputChainForNode(SDNode *N) {
if (unsigned NumOps = N->getNumOperands()) {
if (N->getOperand(0).getValueType() == MVT::Other)
return N->getOperand(0);
else if (N->getOperand(NumOps-1).getValueType() == MVT::Other)
return N->getOperand(NumOps-1);
for (unsigned i = 1; i < NumOps-1; ++i)
if (N->getOperand(i).getValueType() == MVT::Other)
return N->getOperand(i);
}
return SDValue();
}
SDValue DAGCombiner::visitTokenFactor(SDNode *N) {
if (N->getNumOperands() == 2) {
if (getInputChainForNode(N->getOperand(0).getNode()) == N->getOperand(1))
return N->getOperand(0);
if (getInputChainForNode(N->getOperand(1).getNode()) == N->getOperand(0))
return N->getOperand(1);
}
SmallVector<SDNode *, 8> TFs; SmallVector<SDValue, 8> Ops; SmallPtrSet<SDNode*, 16> SeenOps;
bool Changed = false;
TFs.push_back(N);
for (unsigned i = 0; i < TFs.size(); ++i) {
SDNode *TF = TFs[i];
for (unsigned i = 0, ie = TF->getNumOperands(); i != ie; ++i) {
SDValue Op = TF->getOperand(i);
switch (Op.getOpcode()) {
case ISD::EntryToken:
Changed = true;
break;
case ISD::TokenFactor:
if ((CombinerAA || Op.hasOneUse()) &&
std::find(TFs.begin(), TFs.end(), Op.getNode()) == TFs.end()) {
TFs.push_back(Op.getNode());
AddToWorkList(Op.getNode());
Changed = true;
break;
}
default:
if (SeenOps.insert(Op.getNode()))
Ops.push_back(Op);
else
Changed = true;
break;
}
}
}
SDValue Result;
if (Changed) {
if (Ops.empty()) {
Result = DAG.getEntryNode();
} else {
Result = DAG.getNode(ISD::TokenFactor, N->getDebugLoc(),
MVT::Other, &Ops[0], Ops.size());
}
return CombineTo(N, Result, false);
}
return Result;
}
SDValue DAGCombiner::visitMERGE_VALUES(SDNode *N) {
WorkListRemover DeadNodes(*this);
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
DAG.ReplaceAllUsesOfValueWith(SDValue(N, i), N->getOperand(i),
&DeadNodes);
removeFromWorkList(N);
DAG.DeleteNode(N);
return SDValue(N, 0); }
static
SDValue combineShlAddConstant(DebugLoc DL, SDValue N0, SDValue N1,
SelectionDAG &DAG) {
MVT VT = N0.getValueType();
SDValue N00 = N0.getOperand(0);
SDValue N01 = N0.getOperand(1);
ConstantSDNode *N01C = dyn_cast<ConstantSDNode>(N01);
if (N01C && N00.getOpcode() == ISD::ADD && N00.getNode()->hasOneUse() &&
isa<ConstantSDNode>(N00.getOperand(1))) {
N0 = DAG.getNode(ISD::ADD, N0.getDebugLoc(), VT,
DAG.getNode(ISD::SHL, N00.getDebugLoc(), VT,
N00.getOperand(0), N01),
DAG.getNode(ISD::SHL, N01.getDebugLoc(), VT,
N00.getOperand(1), N01));
return DAG.getNode(ISD::ADD, DL, VT, N0, N1);
}
return SDValue();
}
SDValue DAGCombiner::visitADD(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
MVT VT = N0.getValueType();
if (VT.isVector()) {
SDValue FoldedVOp = SimplifyVBinOp(N);
if (FoldedVOp.getNode()) return FoldedVOp;
}
if (N0.getOpcode() == ISD::UNDEF)
return N0;
if (N1.getOpcode() == ISD::UNDEF)
return N1;
if (N0C && N1C)
return DAG.FoldConstantArithmetic(ISD::ADD, VT, N0C, N1C);
if (N0C && !N1C)
return DAG.getNode(ISD::ADD, N->getDebugLoc(), VT, N1, N0);
if (N1C && N1C->isNullValue())
return N0;
if (GlobalAddressSDNode *GA = dyn_cast<GlobalAddressSDNode>(N0))
if (!LegalOperations && TLI.isOffsetFoldingLegal(GA) && N1C &&
GA->getOpcode() == ISD::GlobalAddress)
return DAG.getGlobalAddress(GA->getGlobal(), VT,
GA->getOffset() +
(uint64_t)N1C->getSExtValue());
if (N1C && N0.getOpcode() == ISD::SUB)
if (ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0.getOperand(0)))
return DAG.getNode(ISD::SUB, N->getDebugLoc(), VT,
DAG.getConstant(N1C->getAPIntValue()+
N0C->getAPIntValue(), VT),
N0.getOperand(1));
SDValue RADD = ReassociateOps(ISD::ADD, N->getDebugLoc(), N0, N1);
if (RADD.getNode() != 0)
return RADD;
if (N0.getOpcode() == ISD::SUB && isa<ConstantSDNode>(N0.getOperand(0)) &&
cast<ConstantSDNode>(N0.getOperand(0))->isNullValue())
return DAG.getNode(ISD::SUB, N->getDebugLoc(), VT, N1, N0.getOperand(1));
if (N1.getOpcode() == ISD::SUB && isa<ConstantSDNode>(N1.getOperand(0)) &&
cast<ConstantSDNode>(N1.getOperand(0))->isNullValue())
return DAG.getNode(ISD::SUB, N->getDebugLoc(), VT, N0, N1.getOperand(1));
if (N1.getOpcode() == ISD::SUB && N0 == N1.getOperand(1))
return N1.getOperand(0);
if (N0.getOpcode() == ISD::SUB && N1 == N0.getOperand(1))
return N0.getOperand(0);
if (N1.getOpcode() == ISD::SUB && N1.getOperand(1).getOpcode() == ISD::ADD &&
N0 == N1.getOperand(1).getOperand(0))
return DAG.getNode(ISD::SUB, N->getDebugLoc(), VT, N1.getOperand(0),
N1.getOperand(1).getOperand(1));
if (N1.getOpcode() == ISD::SUB && N1.getOperand(1).getOpcode() == ISD::ADD &&
N0 == N1.getOperand(1).getOperand(1))
return DAG.getNode(ISD::SUB, N->getDebugLoc(), VT, N1.getOperand(0),
N1.getOperand(1).getOperand(0));
if ((N1.getOpcode() == ISD::SUB || N1.getOpcode() == ISD::ADD) &&
N1.getOperand(0).getOpcode() == ISD::SUB &&
N0 == N1.getOperand(0).getOperand(1))
return DAG.getNode(N1.getOpcode(), N->getDebugLoc(), VT,
N1.getOperand(0).getOperand(0), N1.getOperand(1));
if (N0.getOpcode() == ISD::SUB && N1.getOpcode() == ISD::SUB) {
SDValue N00 = N0.getOperand(0);
SDValue N01 = N0.getOperand(1);
SDValue N10 = N1.getOperand(0);
SDValue N11 = N1.getOperand(1);
if (isa<ConstantSDNode>(N00) || isa<ConstantSDNode>(N10))
return DAG.getNode(ISD::SUB, N->getDebugLoc(), VT,
DAG.getNode(ISD::ADD, N0.getDebugLoc(), VT, N00, N10),
DAG.getNode(ISD::ADD, N1.getDebugLoc(), VT, N01, N11));
}
if (!VT.isVector() && SimplifyDemandedBits(SDValue(N, 0)))
return SDValue(N, 0);
if (VT.isInteger() && !VT.isVector()) {
APInt LHSZero, LHSOne;
APInt RHSZero, RHSOne;
APInt Mask = APInt::getAllOnesValue(VT.getSizeInBits());
DAG.ComputeMaskedBits(N0, Mask, LHSZero, LHSOne);
if (LHSZero.getBoolValue()) {
DAG.ComputeMaskedBits(N1, Mask, RHSZero, RHSOne);
if ((RHSZero & (~LHSZero & Mask)) == (~LHSZero & Mask) ||
(LHSZero & (~RHSZero & Mask)) == (~RHSZero & Mask))
return DAG.getNode(ISD::OR, N->getDebugLoc(), VT, N0, N1);
}
}
if (N0.getOpcode() == ISD::SHL && N0.getNode()->hasOneUse()) {
SDValue Result = combineShlAddConstant(N->getDebugLoc(), N0, N1, DAG);
if (Result.getNode()) return Result;
}
if (N1.getOpcode() == ISD::SHL && N1.getNode()->hasOneUse()) {
SDValue Result = combineShlAddConstant(N->getDebugLoc(), N1, N0, DAG);
if (Result.getNode()) return Result;
}
return SDValue();
}
SDValue DAGCombiner::visitADDC(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
MVT VT = N0.getValueType();
if (N->hasNUsesOfValue(0, 1))
return CombineTo(N, DAG.getNode(ISD::ADD, N->getDebugLoc(), VT, N1, N0),
DAG.getNode(ISD::CARRY_FALSE,
N->getDebugLoc(), MVT::Flag));
if (N0C && !N1C)
return DAG.getNode(ISD::ADDC, N->getDebugLoc(), N->getVTList(), N1, N0);
if (N1C && N1C->isNullValue())
return CombineTo(N, N0, DAG.getNode(ISD::CARRY_FALSE,
N->getDebugLoc(), MVT::Flag));
APInt LHSZero, LHSOne;
APInt RHSZero, RHSOne;
APInt Mask = APInt::getAllOnesValue(VT.getSizeInBits());
DAG.ComputeMaskedBits(N0, Mask, LHSZero, LHSOne);
if (LHSZero.getBoolValue()) {
DAG.ComputeMaskedBits(N1, Mask, RHSZero, RHSOne);
if ((RHSZero & (~LHSZero & Mask)) == (~LHSZero & Mask) ||
(LHSZero & (~RHSZero & Mask)) == (~RHSZero & Mask))
return CombineTo(N, DAG.getNode(ISD::OR, N->getDebugLoc(), VT, N0, N1),
DAG.getNode(ISD::CARRY_FALSE,
N->getDebugLoc(), MVT::Flag));
}
return SDValue();
}
SDValue DAGCombiner::visitADDE(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
SDValue CarryIn = N->getOperand(2);
ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
if (N0C && !N1C)
return DAG.getNode(ISD::ADDE, N->getDebugLoc(), N->getVTList(),
N1, N0, CarryIn);
if (CarryIn.getOpcode() == ISD::CARRY_FALSE)
return DAG.getNode(ISD::ADDC, N->getDebugLoc(), N->getVTList(), N1, N0);
return SDValue();
}
SDValue DAGCombiner::visitSUB(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0.getNode());
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode());
MVT VT = N0.getValueType();
if (VT.isVector()) {
SDValue FoldedVOp = SimplifyVBinOp(N);
if (FoldedVOp.getNode()) return FoldedVOp;
}
if (N0 == N1)
return DAG.getConstant(0, N->getValueType(0));
if (N0C && N1C)
return DAG.FoldConstantArithmetic(ISD::SUB, VT, N0C, N1C);
if (N1C)
return DAG.getNode(ISD::ADD, N->getDebugLoc(), VT, N0,
DAG.getConstant(-N1C->getAPIntValue(), VT));
if (N0.getOpcode() == ISD::ADD && N0.getOperand(0) == N1)
return N0.getOperand(1);
if (N0.getOpcode() == ISD::ADD && N0.getOperand(1) == N1)
return N0.getOperand(0);
if (N0.getOpcode() == ISD::ADD &&
(N0.getOperand(1).getOpcode() == ISD::SUB ||
N0.getOperand(1).getOpcode() == ISD::ADD) &&
N0.getOperand(1).getOperand(0) == N1)
return DAG.getNode(N0.getOperand(1).getOpcode(), N->getDebugLoc(), VT,
N0.getOperand(0), N0.getOperand(1).getOperand(1));
if (N0.getOpcode() == ISD::ADD &&
N0.getOperand(1).getOpcode() == ISD::ADD &&
N0.getOperand(1).getOperand(1) == N1)
return DAG.getNode(ISD::ADD, N->getDebugLoc(), VT,
N0.getOperand(0), N0.getOperand(1).getOperand(0));
if (N0.getOpcode() == ISD::SUB &&
N0.getOperand(1).getOpcode() == ISD::SUB &&
N0.getOperand(1).getOperand(1) == N1)
return DAG.getNode(ISD::SUB, N->getDebugLoc(), VT,
N0.getOperand(0), N0.getOperand(1).getOperand(0));
if (N0.getOpcode() == ISD::UNDEF)
return N0;
if (N1.getOpcode() == ISD::UNDEF)
return N1;
if (GlobalAddressSDNode *GA = dyn_cast<GlobalAddressSDNode>(N0))
if (!LegalOperations && TLI.isOffsetFoldingLegal(GA)) {
if (N1C && GA->getOpcode() == ISD::GlobalAddress)
return DAG.getGlobalAddress(GA->getGlobal(), VT,
GA->getOffset() -
(uint64_t)N1C->getSExtValue());
if (GlobalAddressSDNode *GB = dyn_cast<GlobalAddressSDNode>(N1))
if (GA->getGlobal() == GB->getGlobal())
return DAG.getConstant((uint64_t)GA->getOffset() - GB->getOffset(),
VT);
}
return SDValue();
}
SDValue DAGCombiner::visitMUL(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
MVT VT = N0.getValueType();
if (VT.isVector()) {
SDValue FoldedVOp = SimplifyVBinOp(N);
if (FoldedVOp.getNode()) return FoldedVOp;
}
if (N0.getOpcode() == ISD::UNDEF || N1.getOpcode() == ISD::UNDEF)
return DAG.getConstant(0, VT);
if (N0C && N1C)
return DAG.FoldConstantArithmetic(ISD::MUL, VT, N0C, N1C);
if (N0C && !N1C)
return DAG.getNode(ISD::MUL, N->getDebugLoc(), VT, N1, N0);
if (N1C && N1C->isNullValue())
return N1;
if (N1C && N1C->isAllOnesValue())
return DAG.getNode(ISD::SUB, N->getDebugLoc(), VT,
DAG.getConstant(0, VT), N0);
if (N1C && N1C->getAPIntValue().isPowerOf2())
return DAG.getNode(ISD::SHL, N->getDebugLoc(), VT, N0,
DAG.getConstant(N1C->getAPIntValue().logBase2(),
getShiftAmountTy()));
if (N1C && (-N1C->getAPIntValue()).isPowerOf2()) {
unsigned Log2Val = (-N1C->getAPIntValue()).logBase2();
return DAG.getNode(ISD::SUB, N->getDebugLoc(), VT,
DAG.getConstant(0, VT),
DAG.getNode(ISD::SHL, N->getDebugLoc(), VT, N0,
DAG.getConstant(Log2Val, getShiftAmountTy())));
}
if (N1C && N0.getOpcode() == ISD::SHL &&
isa<ConstantSDNode>(N0.getOperand(1))) {
SDValue C3 = DAG.getNode(ISD::SHL, N->getDebugLoc(), VT,
N1, N0.getOperand(1));
AddToWorkList(C3.getNode());
return DAG.getNode(ISD::MUL, N->getDebugLoc(), VT,
N0.getOperand(0), C3);
}
{
SDValue Sh(0,0), Y(0,0);
if (N0.getOpcode() == ISD::SHL && isa<ConstantSDNode>(N0.getOperand(1)) &&
N0.getNode()->hasOneUse()) {
Sh = N0; Y = N1;
} else if (N1.getOpcode() == ISD::SHL &&
isa<ConstantSDNode>(N1.getOperand(1)) &&
N1.getNode()->hasOneUse()) {
Sh = N1; Y = N0;
}
if (Sh.getNode()) {
SDValue Mul = DAG.getNode(ISD::MUL, N->getDebugLoc(), VT,
Sh.getOperand(0), Y);
return DAG.getNode(ISD::SHL, N->getDebugLoc(), VT,
Mul, Sh.getOperand(1));
}
}
if (N1C && N0.getOpcode() == ISD::ADD && N0.getNode()->hasOneUse() &&
isa<ConstantSDNode>(N0.getOperand(1)))
return DAG.getNode(ISD::ADD, N->getDebugLoc(), VT,
DAG.getNode(ISD::MUL, N0.getDebugLoc(), VT,
N0.getOperand(0), N1),
DAG.getNode(ISD::MUL, N1.getDebugLoc(), VT,
N0.getOperand(1), N1));
SDValue RMUL = ReassociateOps(ISD::MUL, N->getDebugLoc(), N0, N1);
if (RMUL.getNode() != 0)
return RMUL;
return SDValue();
}
SDValue DAGCombiner::visitSDIV(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0.getNode());
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode());
MVT VT = N->getValueType(0);
if (VT.isVector()) {
SDValue FoldedVOp = SimplifyVBinOp(N);
if (FoldedVOp.getNode()) return FoldedVOp;
}
if (N0C && N1C && !N1C->isNullValue())
return DAG.FoldConstantArithmetic(ISD::SDIV, VT, N0C, N1C);
if (N1C && N1C->getSExtValue() == 1LL)
return N0;
if (N1C && N1C->isAllOnesValue())
return DAG.getNode(ISD::SUB, N->getDebugLoc(), VT,
DAG.getConstant(0, VT), N0);
if (!VT.isVector()) {
if (DAG.SignBitIsZero(N1) && DAG.SignBitIsZero(N0))
return DAG.getNode(ISD::UDIV, N->getDebugLoc(), N1.getValueType(),
N0, N1);
}
if (N1C && !N1C->isNullValue() && !TLI.isIntDivCheap() &&
(isPowerOf2_64(N1C->getSExtValue()) ||
isPowerOf2_64(-N1C->getSExtValue()))) {
if (TLI.isPow2DivCheap())
return SDValue();
int64_t pow2 = N1C->getSExtValue();
int64_t abs2 = pow2 > 0 ? pow2 : -pow2;
unsigned lg2 = Log2_64(abs2);
SDValue SGN = DAG.getNode(ISD::SRA, N->getDebugLoc(), VT, N0,
DAG.getConstant(VT.getSizeInBits()-1,
getShiftAmountTy()));
AddToWorkList(SGN.getNode());
SDValue SRL = DAG.getNode(ISD::SRL, N->getDebugLoc(), VT, SGN,
DAG.getConstant(VT.getSizeInBits() - lg2,
getShiftAmountTy()));
SDValue ADD = DAG.getNode(ISD::ADD, N->getDebugLoc(), VT, N0, SRL);
AddToWorkList(SRL.getNode());
AddToWorkList(ADD.getNode()); SDValue SRA = DAG.getNode(ISD::SRA, N->getDebugLoc(), VT, ADD,
DAG.getConstant(lg2, getShiftAmountTy()));
if (pow2 > 0)
return SRA;
AddToWorkList(SRA.getNode());
return DAG.getNode(ISD::SUB, N->getDebugLoc(), VT,
DAG.getConstant(0, VT), SRA);
}
if (N1C && (N1C->getSExtValue() < -1 || N1C->getSExtValue() > 1) &&
!TLI.isIntDivCheap()) {
SDValue Op = BuildSDIV(N);
if (Op.getNode()) return Op;
}
if (N0.getOpcode() == ISD::UNDEF)
return DAG.getConstant(0, VT);
if (N1.getOpcode() == ISD::UNDEF)
return N1;
return SDValue();
}
SDValue DAGCombiner::visitUDIV(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0.getNode());
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode());
MVT VT = N->getValueType(0);
if (VT.isVector()) {
SDValue FoldedVOp = SimplifyVBinOp(N);
if (FoldedVOp.getNode()) return FoldedVOp;
}
if (N0C && N1C && !N1C->isNullValue())
return DAG.FoldConstantArithmetic(ISD::UDIV, VT, N0C, N1C);
if (N1C && N1C->getAPIntValue().isPowerOf2())
return DAG.getNode(ISD::SRL, N->getDebugLoc(), VT, N0,
DAG.getConstant(N1C->getAPIntValue().logBase2(),
getShiftAmountTy()));
if (N1.getOpcode() == ISD::SHL) {
if (ConstantSDNode *SHC = dyn_cast<ConstantSDNode>(N1.getOperand(0))) {
if (SHC->getAPIntValue().isPowerOf2()) {
MVT ADDVT = N1.getOperand(1).getValueType();
SDValue Add = DAG.getNode(ISD::ADD, N->getDebugLoc(), ADDVT,
N1.getOperand(1),
DAG.getConstant(SHC->getAPIntValue()
.logBase2(),
ADDVT));
AddToWorkList(Add.getNode());
return DAG.getNode(ISD::SRL, N->getDebugLoc(), VT, N0, Add);
}
}
}
if (N1C && !N1C->isNullValue() && !TLI.isIntDivCheap()) {
SDValue Op = BuildUDIV(N);
if (Op.getNode()) return Op;
}
if (N0.getOpcode() == ISD::UNDEF)
return DAG.getConstant(0, VT);
if (N1.getOpcode() == ISD::UNDEF)
return N1;
return SDValue();
}
SDValue DAGCombiner::visitSREM(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
MVT VT = N->getValueType(0);
if (N0C && N1C && !N1C->isNullValue())
return DAG.FoldConstantArithmetic(ISD::SREM, VT, N0C, N1C);
if (!VT.isVector()) {
if (DAG.SignBitIsZero(N1) && DAG.SignBitIsZero(N0))
return DAG.getNode(ISD::UREM, N->getDebugLoc(), VT, N0, N1);
}
if (N1C && !N1C->isNullValue()) {
SDValue Div = DAG.getNode(ISD::SDIV, N->getDebugLoc(), VT, N0, N1);
AddToWorkList(Div.getNode());
SDValue OptimizedDiv = combine(Div.getNode());
if (OptimizedDiv.getNode() && OptimizedDiv.getNode() != Div.getNode()) {
SDValue Mul = DAG.getNode(ISD::MUL, N->getDebugLoc(), VT,
OptimizedDiv, N1);
SDValue Sub = DAG.getNode(ISD::SUB, N->getDebugLoc(), VT, N0, Mul);
AddToWorkList(Mul.getNode());
return Sub;
}
}
if (N0.getOpcode() == ISD::UNDEF)
return DAG.getConstant(0, VT);
if (N1.getOpcode() == ISD::UNDEF)
return N1;
return SDValue();
}
SDValue DAGCombiner::visitUREM(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
MVT VT = N->getValueType(0);
if (N0C && N1C && !N1C->isNullValue())
return DAG.FoldConstantArithmetic(ISD::UREM, VT, N0C, N1C);
if (N1C && !N1C->isNullValue() && N1C->getAPIntValue().isPowerOf2())
return DAG.getNode(ISD::AND, N->getDebugLoc(), VT, N0,
DAG.getConstant(N1C->getAPIntValue()-1,VT));
if (N1.getOpcode() == ISD::SHL) {
if (ConstantSDNode *SHC = dyn_cast<ConstantSDNode>(N1.getOperand(0))) {
if (SHC->getAPIntValue().isPowerOf2()) {
SDValue Add =
DAG.getNode(ISD::ADD, N->getDebugLoc(), VT, N1,
DAG.getConstant(APInt::getAllOnesValue(VT.getSizeInBits()),
VT));
AddToWorkList(Add.getNode());
return DAG.getNode(ISD::AND, N->getDebugLoc(), VT, N0, Add);
}
}
}
if (N1C && !N1C->isNullValue()) {
SDValue Div = DAG.getNode(ISD::UDIV, N->getDebugLoc(), VT, N0, N1);
AddToWorkList(Div.getNode());
SDValue OptimizedDiv = combine(Div.getNode());
if (OptimizedDiv.getNode() && OptimizedDiv.getNode() != Div.getNode()) {
SDValue Mul = DAG.getNode(ISD::MUL, N->getDebugLoc(), VT,
OptimizedDiv, N1);
SDValue Sub = DAG.getNode(ISD::SUB, N->getDebugLoc(), VT, N0, Mul);
AddToWorkList(Mul.getNode());
return Sub;
}
}
if (N0.getOpcode() == ISD::UNDEF)
return DAG.getConstant(0, VT);
if (N1.getOpcode() == ISD::UNDEF)
return N1;
return SDValue();
}
SDValue DAGCombiner::visitMULHS(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
MVT VT = N->getValueType(0);
if (N1C && N1C->isNullValue())
return N1;
if (N1C && N1C->getAPIntValue() == 1)
return DAG.getNode(ISD::SRA, N->getDebugLoc(), N0.getValueType(), N0,
DAG.getConstant(N0.getValueType().getSizeInBits() - 1,
getShiftAmountTy()));
if (N0.getOpcode() == ISD::UNDEF || N1.getOpcode() == ISD::UNDEF)
return DAG.getConstant(0, VT);
return SDValue();
}
SDValue DAGCombiner::visitMULHU(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
MVT VT = N->getValueType(0);
if (N1C && N1C->isNullValue())
return N1;
if (N1C && N1C->getAPIntValue() == 1)
return DAG.getConstant(0, N0.getValueType());
if (N0.getOpcode() == ISD::UNDEF || N1.getOpcode() == ISD::UNDEF)
return DAG.getConstant(0, VT);
return SDValue();
}
SDValue DAGCombiner::SimplifyNodeWithTwoResults(SDNode *N, unsigned LoOp,
unsigned HiOp) {
bool HiExists = N->hasAnyUseOfValue(1);
if (!HiExists &&
(!LegalOperations ||
TLI.isOperationLegal(LoOp, N->getValueType(0)))) {
SDValue Res = DAG.getNode(LoOp, N->getDebugLoc(), N->getValueType(0),
N->op_begin(), N->getNumOperands());
return CombineTo(N, Res, Res);
}
bool LoExists = N->hasAnyUseOfValue(0);
if (!LoExists &&
(!LegalOperations ||
TLI.isOperationLegal(HiOp, N->getValueType(1)))) {
SDValue Res = DAG.getNode(HiOp, N->getDebugLoc(), N->getValueType(1),
N->op_begin(), N->getNumOperands());
return CombineTo(N, Res, Res);
}
if (LoExists && HiExists)
return SDValue();
if (LoExists) {
SDValue Lo = DAG.getNode(LoOp, N->getDebugLoc(), N->getValueType(0),
N->op_begin(), N->getNumOperands());
AddToWorkList(Lo.getNode());
SDValue LoOpt = combine(Lo.getNode());
if (LoOpt.getNode() && LoOpt.getNode() != Lo.getNode() &&
(!LegalOperations ||
TLI.isOperationLegal(LoOpt.getOpcode(), LoOpt.getValueType())))
return CombineTo(N, LoOpt, LoOpt);
}
if (HiExists) {
SDValue Hi = DAG.getNode(HiOp, N->getDebugLoc(), N->getValueType(1),
N->op_begin(), N->getNumOperands());
AddToWorkList(Hi.getNode());
SDValue HiOpt = combine(Hi.getNode());
if (HiOpt.getNode() && HiOpt != Hi &&
(!LegalOperations ||
TLI.isOperationLegal(HiOpt.getOpcode(), HiOpt.getValueType())))
return CombineTo(N, HiOpt, HiOpt);
}
return SDValue();
}
SDValue DAGCombiner::visitSMUL_LOHI(SDNode *N) {
SDValue Res = SimplifyNodeWithTwoResults(N, ISD::MUL, ISD::MULHS);
if (Res.getNode()) return Res;
return SDValue();
}
SDValue DAGCombiner::visitUMUL_LOHI(SDNode *N) {
SDValue Res = SimplifyNodeWithTwoResults(N, ISD::MUL, ISD::MULHU);
if (Res.getNode()) return Res;
return SDValue();
}
SDValue DAGCombiner::visitSDIVREM(SDNode *N) {
SDValue Res = SimplifyNodeWithTwoResults(N, ISD::SDIV, ISD::SREM);
if (Res.getNode()) return Res;
return SDValue();
}
SDValue DAGCombiner::visitUDIVREM(SDNode *N) {
SDValue Res = SimplifyNodeWithTwoResults(N, ISD::UDIV, ISD::UREM);
if (Res.getNode()) return Res;
return SDValue();
}
SDValue DAGCombiner::SimplifyBinOpWithSameOpcodeHands(SDNode *N) {
SDValue N0 = N->getOperand(0), N1 = N->getOperand(1);
MVT VT = N0.getValueType();
assert(N0.getOpcode() == N1.getOpcode() && "Bad input!");
if ((N0.getOpcode() == ISD::ZERO_EXTEND || N0.getOpcode() == ISD::ANY_EXTEND||
N0.getOpcode() == ISD::SIGN_EXTEND ||
(N0.getOpcode() == ISD::TRUNCATE &&
!TLI.isTruncateFree(N0.getOperand(0).getValueType(), VT))) &&
N0.getOperand(0).getValueType() == N1.getOperand(0).getValueType()) {
SDValue ORNode = DAG.getNode(N->getOpcode(), N0.getDebugLoc(),
N0.getOperand(0).getValueType(),
N0.getOperand(0), N1.getOperand(0));
AddToWorkList(ORNode.getNode());
return DAG.getNode(N0.getOpcode(), N->getDebugLoc(), VT, ORNode);
}
if ((N0.getOpcode() == ISD::SHL || N0.getOpcode() == ISD::SRL ||
N0.getOpcode() == ISD::SRA || N0.getOpcode() == ISD::AND) &&
N0.getOperand(1) == N1.getOperand(1)) {
SDValue ORNode = DAG.getNode(N->getOpcode(), N0.getDebugLoc(),
N0.getOperand(0).getValueType(),
N0.getOperand(0), N1.getOperand(0));
AddToWorkList(ORNode.getNode());
return DAG.getNode(N0.getOpcode(), N->getDebugLoc(), VT,
ORNode, N0.getOperand(1));
}
return SDValue();
}
SDValue DAGCombiner::visitAND(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
SDValue LL, LR, RL, RR, CC0, CC1;
ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
MVT VT = N1.getValueType();
unsigned BitWidth = VT.getSizeInBits();
if (VT.isVector()) {
SDValue FoldedVOp = SimplifyVBinOp(N);
if (FoldedVOp.getNode()) return FoldedVOp;
}
if (N0.getOpcode() == ISD::UNDEF || N1.getOpcode() == ISD::UNDEF)
return DAG.getConstant(0, VT);
if (N0C && N1C)
return DAG.FoldConstantArithmetic(ISD::AND, VT, N0C, N1C);
if (N0C && !N1C)
return DAG.getNode(ISD::AND, N->getDebugLoc(), VT, N1, N0);
if (N1C && N1C->isAllOnesValue())
return N0;
if (N1C && DAG.MaskedValueIsZero(SDValue(N, 0),
APInt::getAllOnesValue(BitWidth)))
return DAG.getConstant(0, VT);
SDValue RAND = ReassociateOps(ISD::AND, N->getDebugLoc(), N0, N1);
if (RAND.getNode() != 0)
return RAND;
if (N1C && N0.getOpcode() == ISD::OR)
if (ConstantSDNode *ORI = dyn_cast<ConstantSDNode>(N0.getOperand(1)))
if ((ORI->getAPIntValue() & N1C->getAPIntValue()) == N1C->getAPIntValue())
return N1;
if (N1C && N0.getOpcode() == ISD::ANY_EXTEND) {
SDValue N0Op0 = N0.getOperand(0);
APInt Mask = ~N1C->getAPIntValue();
Mask.trunc(N0Op0.getValueSizeInBits());
if (DAG.MaskedValueIsZero(N0Op0, Mask)) {
SDValue Zext = DAG.getNode(ISD::ZERO_EXTEND, N->getDebugLoc(),
N0.getValueType(), N0Op0);
CombineTo(N, Zext);
CombineTo(N0.getNode(), Zext);
return SDValue(N, 0); }
}
if (isSetCCEquivalent(N0, LL, LR, CC0) && isSetCCEquivalent(N1, RL, RR, CC1)){
ISD::CondCode Op0 = cast<CondCodeSDNode>(CC0)->get();
ISD::CondCode Op1 = cast<CondCodeSDNode>(CC1)->get();
if (LR == RR && isa<ConstantSDNode>(LR) && Op0 == Op1 &&
LL.getValueType().isInteger()) {
if (cast<ConstantSDNode>(LR)->isNullValue() && Op1 == ISD::SETEQ) {
SDValue ORNode = DAG.getNode(ISD::OR, N0.getDebugLoc(),
LR.getValueType(), LL, RL);
AddToWorkList(ORNode.getNode());
return DAG.getSetCC(N->getDebugLoc(), VT, ORNode, LR, Op1);
}
if (cast<ConstantSDNode>(LR)->isAllOnesValue() && Op1 == ISD::SETEQ) {
SDValue ANDNode = DAG.getNode(ISD::AND, N0.getDebugLoc(),
LR.getValueType(), LL, RL);
AddToWorkList(ANDNode.getNode());
return DAG.getSetCC(N->getDebugLoc(), VT, ANDNode, LR, Op1);
}
if (cast<ConstantSDNode>(LR)->isAllOnesValue() && Op1 == ISD::SETGT) {
SDValue ORNode = DAG.getNode(ISD::OR, N0.getDebugLoc(),
LR.getValueType(), LL, RL);
AddToWorkList(ORNode.getNode());
return DAG.getSetCC(N->getDebugLoc(), VT, ORNode, LR, Op1);
}
}
if (LL == RR && LR == RL) {
Op1 = ISD::getSetCCSwappedOperands(Op1);
std::swap(RL, RR);
}
if (LL == RL && LR == RR) {
bool isInteger = LL.getValueType().isInteger();
ISD::CondCode Result = ISD::getSetCCAndOperation(Op0, Op1, isInteger);
if (Result != ISD::SETCC_INVALID &&
(!LegalOperations || TLI.isCondCodeLegal(Result, LL.getValueType())))
return DAG.getSetCC(N->getDebugLoc(), N0.getValueType(),
LL, LR, Result);
}
}
if (N0.getOpcode() == N1.getOpcode()) {
SDValue Tmp = SimplifyBinOpWithSameOpcodeHands(N);
if (Tmp.getNode()) return Tmp;
}
if (!VT.isVector() &&
SimplifyDemandedBits(SDValue(N, 0)))
return SDValue(N, 0);
if (ISD::isEXTLoad(N0.getNode()) && ISD::isUNINDEXEDLoad(N0.getNode())) {
LoadSDNode *LN0 = cast<LoadSDNode>(N0);
MVT EVT = LN0->getMemoryVT();
unsigned BitWidth = N1.getValueSizeInBits();
if (DAG.MaskedValueIsZero(N1, APInt::getHighBitsSet(BitWidth,
BitWidth - EVT.getSizeInBits())) &&
((!LegalOperations && !LN0->isVolatile()) ||
TLI.isLoadExtLegal(ISD::ZEXTLOAD, EVT))) {
SDValue ExtLoad = DAG.getExtLoad(ISD::ZEXTLOAD, N0.getDebugLoc(), VT,
LN0->getChain(), LN0->getBasePtr(),
LN0->getSrcValue(),
LN0->getSrcValueOffset(), EVT,
LN0->isVolatile(), LN0->getAlignment());
AddToWorkList(N);
CombineTo(N0.getNode(), ExtLoad, ExtLoad.getValue(1));
return SDValue(N, 0); }
}
if (ISD::isSEXTLoad(N0.getNode()) && ISD::isUNINDEXEDLoad(N0.getNode()) &&
N0.hasOneUse()) {
LoadSDNode *LN0 = cast<LoadSDNode>(N0);
MVT EVT = LN0->getMemoryVT();
unsigned BitWidth = N1.getValueSizeInBits();
if (DAG.MaskedValueIsZero(N1, APInt::getHighBitsSet(BitWidth,
BitWidth - EVT.getSizeInBits())) &&
((!LegalOperations && !LN0->isVolatile()) ||
TLI.isLoadExtLegal(ISD::ZEXTLOAD, EVT))) {
SDValue ExtLoad = DAG.getExtLoad(ISD::ZEXTLOAD, N0.getDebugLoc(), VT,
LN0->getChain(),
LN0->getBasePtr(), LN0->getSrcValue(),
LN0->getSrcValueOffset(), EVT,
LN0->isVolatile(), LN0->getAlignment());
AddToWorkList(N);
CombineTo(N0.getNode(), ExtLoad, ExtLoad.getValue(1));
return SDValue(N, 0); }
}
if (N1C && N0.getOpcode() == ISD::LOAD) {
LoadSDNode *LN0 = cast<LoadSDNode>(N0);
if (LN0->getExtensionType() != ISD::SEXTLOAD &&
LN0->isUnindexed() && N0.hasOneUse() &&
!LN0->isVolatile()) {
MVT EVT = MVT::Other;
uint32_t ActiveBits = N1C->getAPIntValue().getActiveBits();
if (ActiveBits > 0 && APIntOps::isMask(ActiveBits, N1C->getAPIntValue()))
EVT = MVT::getIntegerVT(ActiveBits);
MVT LoadedVT = LN0->getMemoryVT();
if (EVT != MVT::Other && LoadedVT.bitsGT(EVT) && EVT.isRound() &&
(!LegalOperations || TLI.isLoadExtLegal(ISD::ZEXTLOAD, EVT))) {
MVT PtrType = N0.getOperand(1).getValueType();
unsigned LVTStoreBytes = LoadedVT.getStoreSizeInBits()/8;
unsigned EVTStoreBytes = EVT.getStoreSizeInBits()/8;
unsigned PtrOff = LVTStoreBytes - EVTStoreBytes;
unsigned Alignment = LN0->getAlignment();
SDValue NewPtr = LN0->getBasePtr();
if (TLI.isBigEndian()) {
NewPtr = DAG.getNode(ISD::ADD, LN0->getDebugLoc(), PtrType,
NewPtr, DAG.getConstant(PtrOff, PtrType));
Alignment = MinAlign(Alignment, PtrOff);
}
AddToWorkList(NewPtr.getNode());
SDValue Load =
DAG.getExtLoad(ISD::ZEXTLOAD, LN0->getDebugLoc(), VT, LN0->getChain(),
NewPtr, LN0->getSrcValue(), LN0->getSrcValueOffset(),
EVT, LN0->isVolatile(), Alignment);
AddToWorkList(N);
CombineTo(N0.getNode(), Load, Load.getValue(1));
return SDValue(N, 0); }
}
}
return SDValue();
}
SDValue DAGCombiner::visitOR(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
SDValue LL, LR, RL, RR, CC0, CC1;
ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
MVT VT = N1.getValueType();
if (VT.isVector()) {
SDValue FoldedVOp = SimplifyVBinOp(N);
if (FoldedVOp.getNode()) return FoldedVOp;
}
if (N0.getOpcode() == ISD::UNDEF || N1.getOpcode() == ISD::UNDEF)
return DAG.getConstant(~0ULL, VT);
if (N0C && N1C)
return DAG.FoldConstantArithmetic(ISD::OR, VT, N0C, N1C);
if (N0C && !N1C)
return DAG.getNode(ISD::OR, N->getDebugLoc(), VT, N1, N0);
if (N1C && N1C->isNullValue())
return N0;
if (N1C && N1C->isAllOnesValue())
return N1;
if (N1C && DAG.MaskedValueIsZero(N0, ~N1C->getAPIntValue()))
return N1;
SDValue ROR = ReassociateOps(ISD::OR, N->getDebugLoc(), N0, N1);
if (ROR.getNode() != 0)
return ROR;
if (N1C && N0.getOpcode() == ISD::AND && N0.getNode()->hasOneUse() &&
isa<ConstantSDNode>(N0.getOperand(1))) {
ConstantSDNode *C1 = cast<ConstantSDNode>(N0.getOperand(1));
return DAG.getNode(ISD::AND, N->getDebugLoc(), VT,
DAG.getNode(ISD::OR, N0.getDebugLoc(), VT,
N0.getOperand(0), N1),
DAG.FoldConstantArithmetic(ISD::OR, VT, N1C, C1));
}
if (isSetCCEquivalent(N0, LL, LR, CC0) && isSetCCEquivalent(N1, RL, RR, CC1)){
ISD::CondCode Op0 = cast<CondCodeSDNode>(CC0)->get();
ISD::CondCode Op1 = cast<CondCodeSDNode>(CC1)->get();
if (LR == RR && isa<ConstantSDNode>(LR) && Op0 == Op1 &&
LL.getValueType().isInteger()) {
if (cast<ConstantSDNode>(LR)->isNullValue() &&
(Op1 == ISD::SETNE || Op1 == ISD::SETLT)) {
SDValue ORNode = DAG.getNode(ISD::OR, LR.getDebugLoc(),
LR.getValueType(), LL, RL);
AddToWorkList(ORNode.getNode());
return DAG.getSetCC(N->getDebugLoc(), VT, ORNode, LR, Op1);
}
if (cast<ConstantSDNode>(LR)->isAllOnesValue() &&
(Op1 == ISD::SETNE || Op1 == ISD::SETGT)) {
SDValue ANDNode = DAG.getNode(ISD::AND, LR.getDebugLoc(),
LR.getValueType(), LL, RL);
AddToWorkList(ANDNode.getNode());
return DAG.getSetCC(N->getDebugLoc(), VT, ANDNode, LR, Op1);
}
}
if (LL == RR && LR == RL) {
Op1 = ISD::getSetCCSwappedOperands(Op1);
std::swap(RL, RR);
}
if (LL == RL && LR == RR) {
bool isInteger = LL.getValueType().isInteger();
ISD::CondCode Result = ISD::getSetCCOrOperation(Op0, Op1, isInteger);
if (Result != ISD::SETCC_INVALID &&
(!LegalOperations || TLI.isCondCodeLegal(Result, LL.getValueType())))
return DAG.getSetCC(N->getDebugLoc(), N0.getValueType(),
LL, LR, Result);
}
}
if (N0.getOpcode() == N1.getOpcode()) {
SDValue Tmp = SimplifyBinOpWithSameOpcodeHands(N);
if (Tmp.getNode()) return Tmp;
}
if (N0.getOpcode() == ISD::AND &&
N1.getOpcode() == ISD::AND &&
N0.getOperand(1).getOpcode() == ISD::Constant &&
N1.getOperand(1).getOpcode() == ISD::Constant &&
(N0.getNode()->hasOneUse() || N1.getNode()->hasOneUse())) {
const APInt &LHSMask =
cast<ConstantSDNode>(N0.getOperand(1))->getAPIntValue();
const APInt &RHSMask =
cast<ConstantSDNode>(N1.getOperand(1))->getAPIntValue();
if (DAG.MaskedValueIsZero(N0.getOperand(0), RHSMask&~LHSMask) &&
DAG.MaskedValueIsZero(N1.getOperand(0), LHSMask&~RHSMask)) {
SDValue X = DAG.getNode(ISD::OR, N0.getDebugLoc(), VT,
N0.getOperand(0), N1.getOperand(0));
return DAG.getNode(ISD::AND, N->getDebugLoc(), VT, X,
DAG.getConstant(LHSMask | RHSMask, VT));
}
}
if (SDNode *Rot = MatchRotate(N0, N1, N->getDebugLoc()))
return SDValue(Rot, 0);
return SDValue();
}
static bool MatchRotateHalf(SDValue Op, SDValue &Shift, SDValue &Mask) {
if (Op.getOpcode() == ISD::AND) {
if (isa<ConstantSDNode>(Op.getOperand(1))) {
Mask = Op.getOperand(1);
Op = Op.getOperand(0);
} else {
return false;
}
}
if (Op.getOpcode() == ISD::SRL || Op.getOpcode() == ISD::SHL) {
Shift = Op;
return true;
}
return false;
}
SDNode *DAGCombiner::MatchRotate(SDValue LHS, SDValue RHS, DebugLoc DL) {
MVT VT = LHS.getValueType();
if (!TLI.isTypeLegal(VT)) return 0;
bool HasROTL = TLI.isOperationLegalOrCustom(ISD::ROTL, VT);
bool HasROTR = TLI.isOperationLegalOrCustom(ISD::ROTR, VT);
if (!HasROTL && !HasROTR) return 0;
SDValue LHSShift; SDValue LHSMask; if (!MatchRotateHalf(LHS, LHSShift, LHSMask))
return 0;
SDValue RHSShift; SDValue RHSMask; if (!MatchRotateHalf(RHS, RHSShift, RHSMask))
return 0;
if (LHSShift.getOperand(0) != RHSShift.getOperand(0))
return 0;
if (LHSShift.getOpcode() == RHSShift.getOpcode())
return 0;
if (RHSShift.getOpcode() == ISD::SHL) {
std::swap(LHS, RHS);
std::swap(LHSShift, RHSShift);
std::swap(LHSMask , RHSMask );
}
unsigned OpSizeInBits = VT.getSizeInBits();
SDValue LHSShiftArg = LHSShift.getOperand(0);
SDValue LHSShiftAmt = LHSShift.getOperand(1);
SDValue RHSShiftAmt = RHSShift.getOperand(1);
if (LHSShiftAmt.getOpcode() == ISD::Constant &&
RHSShiftAmt.getOpcode() == ISD::Constant) {
uint64_t LShVal = cast<ConstantSDNode>(LHSShiftAmt)->getZExtValue();
uint64_t RShVal = cast<ConstantSDNode>(RHSShiftAmt)->getZExtValue();
if ((LShVal + RShVal) != OpSizeInBits)
return 0;
SDValue Rot;
if (HasROTL)
Rot = DAG.getNode(ISD::ROTL, DL, VT, LHSShiftArg, LHSShiftAmt);
else
Rot = DAG.getNode(ISD::ROTR, DL, VT, LHSShiftArg, RHSShiftAmt);
if (LHSMask.getNode() || RHSMask.getNode()) {
APInt Mask = APInt::getAllOnesValue(OpSizeInBits);
if (LHSMask.getNode()) {
APInt RHSBits = APInt::getLowBitsSet(OpSizeInBits, LShVal);
Mask &= cast<ConstantSDNode>(LHSMask)->getAPIntValue() | RHSBits;
}
if (RHSMask.getNode()) {
APInt LHSBits = APInt::getHighBitsSet(OpSizeInBits, RShVal);
Mask &= cast<ConstantSDNode>(RHSMask)->getAPIntValue() | LHSBits;
}
Rot = DAG.getNode(ISD::AND, DL, VT, Rot, DAG.getConstant(Mask, VT));
}
return Rot.getNode();
}
if (LHSMask.getNode() || RHSMask.getNode())
return 0;
if (RHSShiftAmt.getOpcode() == ISD::SUB &&
LHSShiftAmt == RHSShiftAmt.getOperand(1)) {
if (ConstantSDNode *SUBC =
dyn_cast<ConstantSDNode>(RHSShiftAmt.getOperand(0))) {
if (SUBC->getAPIntValue() == OpSizeInBits) {
if (HasROTL)
return DAG.getNode(ISD::ROTL, DL, VT,
LHSShiftArg, LHSShiftAmt).getNode();
else
return DAG.getNode(ISD::ROTR, DL, VT,
LHSShiftArg, RHSShiftAmt).getNode();
}
}
}
if (LHSShiftAmt.getOpcode() == ISD::SUB &&
RHSShiftAmt == LHSShiftAmt.getOperand(1)) {
if (ConstantSDNode *SUBC =
dyn_cast<ConstantSDNode>(LHSShiftAmt.getOperand(0))) {
if (SUBC->getAPIntValue() == OpSizeInBits) {
if (HasROTR)
return DAG.getNode(ISD::ROTR, DL, VT,
LHSShiftArg, RHSShiftAmt).getNode();
else
return DAG.getNode(ISD::ROTL, DL, VT,
LHSShiftArg, LHSShiftAmt).getNode();
}
}
}
if ((LHSShiftAmt.getOpcode() == ISD::SIGN_EXTEND
|| LHSShiftAmt.getOpcode() == ISD::ZERO_EXTEND
|| LHSShiftAmt.getOpcode() == ISD::ANY_EXTEND
|| LHSShiftAmt.getOpcode() == ISD::TRUNCATE) &&
(RHSShiftAmt.getOpcode() == ISD::SIGN_EXTEND
|| RHSShiftAmt.getOpcode() == ISD::ZERO_EXTEND
|| RHSShiftAmt.getOpcode() == ISD::ANY_EXTEND
|| RHSShiftAmt.getOpcode() == ISD::TRUNCATE)) {
SDValue LExtOp0 = LHSShiftAmt.getOperand(0);
SDValue RExtOp0 = RHSShiftAmt.getOperand(0);
if (RExtOp0.getOpcode() == ISD::SUB &&
RExtOp0.getOperand(1) == LExtOp0) {
if (ConstantSDNode *SUBC =
dyn_cast<ConstantSDNode>(RExtOp0.getOperand(0))) {
if (SUBC->getAPIntValue() == OpSizeInBits) {
return DAG.getNode(HasROTL ? ISD::ROTL : ISD::ROTR, DL, VT,
LHSShiftArg,
HasROTL ? LHSShiftAmt : RHSShiftAmt).getNode();
}
}
} else if (LExtOp0.getOpcode() == ISD::SUB &&
RExtOp0 == LExtOp0.getOperand(1)) {
if (ConstantSDNode *SUBC =
dyn_cast<ConstantSDNode>(LExtOp0.getOperand(0))) {
if (SUBC->getAPIntValue() == OpSizeInBits) {
return DAG.getNode(HasROTR ? ISD::ROTR : ISD::ROTL, DL, VT,
LHSShiftArg,
HasROTR ? RHSShiftAmt : LHSShiftAmt).getNode();
}
}
}
}
return 0;
}
SDValue DAGCombiner::visitXOR(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
SDValue LHS, RHS, CC;
ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
MVT VT = N0.getValueType();
if (VT.isVector()) {
SDValue FoldedVOp = SimplifyVBinOp(N);
if (FoldedVOp.getNode()) return FoldedVOp;
}
if (N0.getOpcode() == ISD::UNDEF && N1.getOpcode() == ISD::UNDEF)
return DAG.getConstant(0, VT);
if (N0.getOpcode() == ISD::UNDEF)
return N0;
if (N1.getOpcode() == ISD::UNDEF)
return N1;
if (N0C && N1C)
return DAG.FoldConstantArithmetic(ISD::XOR, VT, N0C, N1C);
if (N0C && !N1C)
return DAG.getNode(ISD::XOR, N->getDebugLoc(), VT, N1, N0);
if (N1C && N1C->isNullValue())
return N0;
SDValue RXOR = ReassociateOps(ISD::XOR, N->getDebugLoc(), N0, N1);
if (RXOR.getNode() != 0)
return RXOR;
if (N1C && N1C->getAPIntValue() == 1 && isSetCCEquivalent(N0, LHS, RHS, CC)) {
bool isInt = LHS.getValueType().isInteger();
ISD::CondCode NotCC = ISD::getSetCCInverse(cast<CondCodeSDNode>(CC)->get(),
isInt);
if (!LegalOperations || TLI.isCondCodeLegal(NotCC, LHS.getValueType())) {
switch (N0.getOpcode()) {
default:
assert(0 && "Unhandled SetCC Equivalent!");
abort();
case ISD::SETCC:
return DAG.getSetCC(N->getDebugLoc(), VT, LHS, RHS, NotCC);
case ISD::SELECT_CC:
return DAG.getSelectCC(N->getDebugLoc(), LHS, RHS, N0.getOperand(2),
N0.getOperand(3), NotCC);
}
}
}
if (N1C && N1C->getAPIntValue() == 1 && N0.getOpcode() == ISD::ZERO_EXTEND &&
N0.getNode()->hasOneUse() &&
isSetCCEquivalent(N0.getOperand(0), LHS, RHS, CC)){
SDValue V = N0.getOperand(0);
V = DAG.getNode(ISD::XOR, N0.getDebugLoc(), V.getValueType(), V,
DAG.getConstant(1, V.getValueType()));
AddToWorkList(V.getNode());
return DAG.getNode(ISD::ZERO_EXTEND, N->getDebugLoc(), VT, V);
}
if (N1C && N1C->getAPIntValue() == 1 && VT == MVT::i1 &&
(N0.getOpcode() == ISD::OR || N0.getOpcode() == ISD::AND)) {
SDValue LHS = N0.getOperand(0), RHS = N0.getOperand(1);
if (isOneUseSetCC(RHS) || isOneUseSetCC(LHS)) {
unsigned NewOpcode = N0.getOpcode() == ISD::AND ? ISD::OR : ISD::AND;
LHS = DAG.getNode(ISD::XOR, LHS.getDebugLoc(), VT, LHS, N1); RHS = DAG.getNode(ISD::XOR, RHS.getDebugLoc(), VT, RHS, N1); AddToWorkList(LHS.getNode()); AddToWorkList(RHS.getNode());
return DAG.getNode(NewOpcode, N->getDebugLoc(), VT, LHS, RHS);
}
}
if (N1C && N1C->isAllOnesValue() &&
(N0.getOpcode() == ISD::OR || N0.getOpcode() == ISD::AND)) {
SDValue LHS = N0.getOperand(0), RHS = N0.getOperand(1);
if (isa<ConstantSDNode>(RHS) || isa<ConstantSDNode>(LHS)) {
unsigned NewOpcode = N0.getOpcode() == ISD::AND ? ISD::OR : ISD::AND;
LHS = DAG.getNode(ISD::XOR, LHS.getDebugLoc(), VT, LHS, N1); RHS = DAG.getNode(ISD::XOR, RHS.getDebugLoc(), VT, RHS, N1); AddToWorkList(LHS.getNode()); AddToWorkList(RHS.getNode());
return DAG.getNode(NewOpcode, N->getDebugLoc(), VT, LHS, RHS);
}
}
if (N1C && N0.getOpcode() == ISD::XOR) {
ConstantSDNode *N00C = dyn_cast<ConstantSDNode>(N0.getOperand(0));
ConstantSDNode *N01C = dyn_cast<ConstantSDNode>(N0.getOperand(1));
if (N00C)
return DAG.getNode(ISD::XOR, N->getDebugLoc(), VT, N0.getOperand(1),
DAG.getConstant(N1C->getAPIntValue() ^
N00C->getAPIntValue(), VT));
if (N01C)
return DAG.getNode(ISD::XOR, N->getDebugLoc(), VT, N0.getOperand(0),
DAG.getConstant(N1C->getAPIntValue() ^
N01C->getAPIntValue(), VT));
}
if (N0 == N1) {
if (!VT.isVector()) {
return DAG.getConstant(0, VT);
} else if (!LegalOperations || TLI.isOperationLegal(ISD::BUILD_VECTOR, VT)){
SDValue El = DAG.getConstant(0, VT.getVectorElementType());
std::vector<SDValue> Ops(VT.getVectorNumElements(), El);
return DAG.getNode(ISD::BUILD_VECTOR, N->getDebugLoc(), VT,
&Ops[0], Ops.size());
}
}
if (N0.getOpcode() == N1.getOpcode()) {
SDValue Tmp = SimplifyBinOpWithSameOpcodeHands(N);
if (Tmp.getNode()) return Tmp;
}
if (!VT.isVector() &&
SimplifyDemandedBits(SDValue(N, 0)))
return SDValue(N, 0);
return SDValue();
}
SDValue DAGCombiner::visitShiftByConstant(SDNode *N, unsigned Amt) {
SDNode *LHS = N->getOperand(0).getNode();
if (!LHS->hasOneUse()) return SDValue();
bool HighBitSet = false;
switch (LHS->getOpcode()) {
default: return SDValue();
case ISD::OR:
case ISD::XOR:
HighBitSet = false; break;
case ISD::AND:
HighBitSet = true; break;
case ISD::ADD:
if (N->getOpcode() != ISD::SHL)
return SDValue(); HighBitSet = false; break;
}
ConstantSDNode *BinOpCst = dyn_cast<ConstantSDNode>(LHS->getOperand(1));
if (!BinOpCst) return SDValue();
SDNode *BinOpLHSVal = LHS->getOperand(0).getNode();
if ((BinOpLHSVal->getOpcode() != ISD::SHL &&
BinOpLHSVal->getOpcode() != ISD::SRA &&
BinOpLHSVal->getOpcode() != ISD::SRL) ||
!isa<ConstantSDNode>(BinOpLHSVal->getOperand(1)))
return SDValue();
MVT VT = N->getValueType(0);
if (N->getOpcode() == ISD::SRA) {
bool BinOpRHSSignSet = BinOpCst->getAPIntValue().isNegative();
if (BinOpRHSSignSet != HighBitSet)
return SDValue();
}
SDValue NewRHS = DAG.getNode(N->getOpcode(), LHS->getOperand(1).getDebugLoc(),
N->getValueType(0),
LHS->getOperand(1), N->getOperand(1));
SDValue NewShift = DAG.getNode(N->getOpcode(), LHS->getOperand(0).getDebugLoc(),
VT, LHS->getOperand(0), N->getOperand(1));
return DAG.getNode(LHS->getOpcode(), N->getDebugLoc(), VT, NewShift, NewRHS);
}
SDValue DAGCombiner::visitSHL(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
MVT VT = N0.getValueType();
unsigned OpSizeInBits = VT.getSizeInBits();
if (N0C && N1C)
return DAG.FoldConstantArithmetic(ISD::SHL, VT, N0C, N1C);
if (N0C && N0C->isNullValue())
return N0;
if (N1C && N1C->getZExtValue() >= OpSizeInBits)
return DAG.getUNDEF(VT);
if (N1C && N1C->isNullValue())
return N0;
if (DAG.MaskedValueIsZero(SDValue(N, 0),
APInt::getAllOnesValue(VT.getSizeInBits())))
return DAG.getConstant(0, VT);
if (N1.getOpcode() == ISD::TRUNCATE &&
N1.getOperand(0).getOpcode() == ISD::AND &&
N1.hasOneUse() && N1.getOperand(0).hasOneUse()) {
SDValue N101 = N1.getOperand(0).getOperand(1);
if (ConstantSDNode *N101C = dyn_cast<ConstantSDNode>(N101)) {
MVT TruncVT = N1.getValueType();
SDValue N100 = N1.getOperand(0).getOperand(0);
APInt TruncC = N101C->getAPIntValue();
TruncC.trunc(TruncVT.getSizeInBits());
return DAG.getNode(ISD::SHL, N->getDebugLoc(), VT, N0,
DAG.getNode(ISD::AND, N->getDebugLoc(), TruncVT,
DAG.getNode(ISD::TRUNCATE,
N->getDebugLoc(),
TruncVT, N100),
DAG.getConstant(TruncC, TruncVT)));
}
}
if (N1C && SimplifyDemandedBits(SDValue(N, 0)))
return SDValue(N, 0);
if (N1C && N0.getOpcode() == ISD::SHL &&
N0.getOperand(1).getOpcode() == ISD::Constant) {
uint64_t c1 = cast<ConstantSDNode>(N0.getOperand(1))->getZExtValue();
uint64_t c2 = N1C->getZExtValue();
if (c1 + c2 > OpSizeInBits)
return DAG.getConstant(0, VT);
return DAG.getNode(ISD::SHL, N->getDebugLoc(), VT, N0.getOperand(0),
DAG.getConstant(c1 + c2, N1.getValueType()));
}
if (N1C && N0.getOpcode() == ISD::SRL &&
N0.getOperand(1).getOpcode() == ISD::Constant) {
uint64_t c1 = cast<ConstantSDNode>(N0.getOperand(1))->getZExtValue();
uint64_t c2 = N1C->getZExtValue();
SDValue Mask = DAG.getNode(ISD::AND, N0.getDebugLoc(), VT, N0.getOperand(0),
DAG.getConstant(~0ULL << c1, VT));
if (c2 > c1)
return DAG.getNode(ISD::SHL, N->getDebugLoc(), VT, Mask,
DAG.getConstant(c2-c1, N1.getValueType()));
else
return DAG.getNode(ISD::SRL, N->getDebugLoc(), VT, Mask,
DAG.getConstant(c1-c2, N1.getValueType()));
}
if (N1C && N0.getOpcode() == ISD::SRA && N1 == N0.getOperand(1))
return DAG.getNode(ISD::AND, N->getDebugLoc(), VT, N0.getOperand(0),
DAG.getConstant(~0ULL << N1C->getZExtValue(), VT));
return N1C ? visitShiftByConstant(N, N1C->getZExtValue()) : SDValue();
}
SDValue DAGCombiner::visitSRA(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
MVT VT = N0.getValueType();
if (N0C && N1C)
return DAG.FoldConstantArithmetic(ISD::SRA, VT, N0C, N1C);
if (N0C && N0C->isNullValue())
return N0;
if (N0C && N0C->isAllOnesValue())
return N0;
if (N1C && N1C->getZExtValue() >= VT.getSizeInBits())
return DAG.getUNDEF(VT);
if (N1C && N1C->isNullValue())
return N0;
if (N1C && N0.getOpcode() == ISD::SHL && N1 == N0.getOperand(1)) {
unsigned LowBits = VT.getSizeInBits() - (unsigned)N1C->getZExtValue();
MVT EVT = MVT::getIntegerVT(LowBits);
if ((!LegalOperations || TLI.isOperationLegal(ISD::SIGN_EXTEND_INREG, EVT)))
return DAG.getNode(ISD::SIGN_EXTEND_INREG, N->getDebugLoc(), VT,
N0.getOperand(0), DAG.getValueType(EVT));
}
if (N1C && N0.getOpcode() == ISD::SRA) {
if (ConstantSDNode *C1 = dyn_cast<ConstantSDNode>(N0.getOperand(1))) {
unsigned Sum = N1C->getZExtValue() + C1->getZExtValue();
if (Sum >= VT.getSizeInBits()) Sum = VT.getSizeInBits()-1;
return DAG.getNode(ISD::SRA, N->getDebugLoc(), VT, N0.getOperand(0),
DAG.getConstant(Sum, N1C->getValueType(0)));
}
}
if (N0.getOpcode() == ISD::SHL) {
const ConstantSDNode *N01C = dyn_cast<ConstantSDNode>(N0.getOperand(1));
if (N01C && N1C) {
unsigned VTValSize = VT.getSizeInBits();
MVT TruncVT =
MVT::getIntegerVT(VTValSize - N1C->getZExtValue());
unsigned ShiftAmt = N1C->getZExtValue() - N01C->getZExtValue();
if (ShiftAmt &&
TLI.isOperationLegalOrCustom(ISD::SIGN_EXTEND, TruncVT) &&
TLI.isOperationLegalOrCustom(ISD::TRUNCATE, VT) &&
TLI.isTruncateFree(VT, TruncVT)) {
SDValue Amt = DAG.getConstant(ShiftAmt, getShiftAmountTy());
SDValue Shift = DAG.getNode(ISD::SRL, N0.getDebugLoc(), VT,
N0.getOperand(0), Amt);
SDValue Trunc = DAG.getNode(ISD::TRUNCATE, N0.getDebugLoc(), TruncVT,
Shift);
return DAG.getNode(ISD::SIGN_EXTEND, N->getDebugLoc(),
N->getValueType(0), Trunc);
}
}
}
if (N1.getOpcode() == ISD::TRUNCATE &&
N1.getOperand(0).getOpcode() == ISD::AND &&
N1.hasOneUse() && N1.getOperand(0).hasOneUse()) {
SDValue N101 = N1.getOperand(0).getOperand(1);
if (ConstantSDNode *N101C = dyn_cast<ConstantSDNode>(N101)) {
MVT TruncVT = N1.getValueType();
SDValue N100 = N1.getOperand(0).getOperand(0);
APInt TruncC = N101C->getAPIntValue();
TruncC.trunc(TruncVT.getSizeInBits());
return DAG.getNode(ISD::SRA, N->getDebugLoc(), VT, N0,
DAG.getNode(ISD::AND, N->getDebugLoc(),
TruncVT,
DAG.getNode(ISD::TRUNCATE,
N->getDebugLoc(),
TruncVT, N100),
DAG.getConstant(TruncC, TruncVT)));
}
}
if (N1C && SimplifyDemandedBits(SDValue(N, 0)))
return SDValue(N, 0);
if (DAG.SignBitIsZero(N0))
return DAG.getNode(ISD::SRL, N->getDebugLoc(), VT, N0, N1);
return N1C ? visitShiftByConstant(N, N1C->getZExtValue()) : SDValue();
}
SDValue DAGCombiner::visitSRL(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
MVT VT = N0.getValueType();
unsigned OpSizeInBits = VT.getSizeInBits();
if (N0C && N1C)
return DAG.FoldConstantArithmetic(ISD::SRL, VT, N0C, N1C);
if (N0C && N0C->isNullValue())
return N0;
if (N1C && N1C->getZExtValue() >= OpSizeInBits)
return DAG.getUNDEF(VT);
if (N1C && N1C->isNullValue())
return N0;
if (N1C && DAG.MaskedValueIsZero(SDValue(N, 0),
APInt::getAllOnesValue(OpSizeInBits)))
return DAG.getConstant(0, VT);
if (N1C && N0.getOpcode() == ISD::SRL &&
N0.getOperand(1).getOpcode() == ISD::Constant) {
uint64_t c1 = cast<ConstantSDNode>(N0.getOperand(1))->getZExtValue();
uint64_t c2 = N1C->getZExtValue();
if (c1 + c2 > OpSizeInBits)
return DAG.getConstant(0, VT);
return DAG.getNode(ISD::SRL, N->getDebugLoc(), VT, N0.getOperand(0),
DAG.getConstant(c1 + c2, N1.getValueType()));
}
if (N1C && N0.getOpcode() == ISD::ANY_EXTEND) {
MVT SmallVT = N0.getOperand(0).getValueType();
if (N1C->getZExtValue() >= SmallVT.getSizeInBits())
return DAG.getUNDEF(VT);
SDValue SmallShift = DAG.getNode(ISD::SRL, N0.getDebugLoc(), SmallVT,
N0.getOperand(0), N1);
AddToWorkList(SmallShift.getNode());
return DAG.getNode(ISD::ANY_EXTEND, N->getDebugLoc(), VT, SmallShift);
}
if (N1C && N1C->getZExtValue() + 1 == VT.getSizeInBits()) {
if (N0.getOpcode() == ISD::SRA)
return DAG.getNode(ISD::SRL, N->getDebugLoc(), VT, N0.getOperand(0), N1);
}
if (N1C && N0.getOpcode() == ISD::CTLZ &&
N1C->getAPIntValue() == Log2_32(VT.getSizeInBits())) {
APInt KnownZero, KnownOne;
APInt Mask = APInt::getAllOnesValue(VT.getSizeInBits());
DAG.ComputeMaskedBits(N0.getOperand(0), Mask, KnownZero, KnownOne);
if (KnownOne.getBoolValue()) return DAG.getConstant(0, VT);
APInt UnknownBits = ~KnownZero & Mask;
if (UnknownBits == 0) return DAG.getConstant(1, VT);
if ((UnknownBits & (UnknownBits - 1)) == 0) {
unsigned ShAmt = UnknownBits.countTrailingZeros();
SDValue Op = N0.getOperand(0);
if (ShAmt) {
Op = DAG.getNode(ISD::SRL, N0.getDebugLoc(), VT, Op,
DAG.getConstant(ShAmt, getShiftAmountTy()));
AddToWorkList(Op.getNode());
}
return DAG.getNode(ISD::XOR, N->getDebugLoc(), VT,
Op, DAG.getConstant(1, VT));
}
}
if (N1.getOpcode() == ISD::TRUNCATE &&
N1.getOperand(0).getOpcode() == ISD::AND &&
N1.hasOneUse() && N1.getOperand(0).hasOneUse()) {
SDValue N101 = N1.getOperand(0).getOperand(1);
if (ConstantSDNode *N101C = dyn_cast<ConstantSDNode>(N101)) {
MVT TruncVT = N1.getValueType();
SDValue N100 = N1.getOperand(0).getOperand(0);
APInt TruncC = N101C->getAPIntValue();
TruncC.trunc(TruncVT.getSizeInBits());
return DAG.getNode(ISD::SRL, N->getDebugLoc(), VT, N0,
DAG.getNode(ISD::AND, N->getDebugLoc(),
TruncVT,
DAG.getNode(ISD::TRUNCATE,
N->getDebugLoc(),
TruncVT, N100),
DAG.getConstant(TruncC, TruncVT)));
}
}
if (N1C && SimplifyDemandedBits(SDValue(N, 0)))
return SDValue(N, 0);
return N1C ? visitShiftByConstant(N, N1C->getZExtValue()) : SDValue();
}
SDValue DAGCombiner::visitCTLZ(SDNode *N) {
SDValue N0 = N->getOperand(0);
MVT VT = N->getValueType(0);
if (isa<ConstantSDNode>(N0))
return DAG.getNode(ISD::CTLZ, N->getDebugLoc(), VT, N0);
return SDValue();
}
SDValue DAGCombiner::visitCTTZ(SDNode *N) {
SDValue N0 = N->getOperand(0);
MVT VT = N->getValueType(0);
if (isa<ConstantSDNode>(N0))
return DAG.getNode(ISD::CTTZ, N->getDebugLoc(), VT, N0);
return SDValue();
}
SDValue DAGCombiner::visitCTPOP(SDNode *N) {
SDValue N0 = N->getOperand(0);
MVT VT = N->getValueType(0);
if (isa<ConstantSDNode>(N0))
return DAG.getNode(ISD::CTPOP, N->getDebugLoc(), VT, N0);
return SDValue();
}
SDValue DAGCombiner::visitSELECT(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
SDValue N2 = N->getOperand(2);
ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2);
MVT VT = N->getValueType(0);
MVT VT0 = N0.getValueType();
if (N1 == N2)
return N1;
if (N0C && !N0C->isNullValue())
return N1;
if (N0C && N0C->isNullValue())
return N2;
if (VT == MVT::i1 && N1C && N1C->getAPIntValue() == 1)
return DAG.getNode(ISD::OR, N->getDebugLoc(), VT, N0, N2);
if (VT.isInteger() &&
(VT0 == MVT::i1 ||
(VT0.isInteger() &&
TLI.getBooleanContents() == TargetLowering::ZeroOrOneBooleanContent)) &&
N1C && N2C && N1C->isNullValue() && N2C->getAPIntValue() == 1) {
SDValue XORNode;
if (VT == VT0)
return DAG.getNode(ISD::XOR, N->getDebugLoc(), VT0,
N0, DAG.getConstant(1, VT0));
XORNode = DAG.getNode(ISD::XOR, N0.getDebugLoc(), VT0,
N0, DAG.getConstant(1, VT0));
AddToWorkList(XORNode.getNode());
if (VT.bitsGT(VT0))
return DAG.getNode(ISD::ZERO_EXTEND, N->getDebugLoc(), VT, XORNode);
return DAG.getNode(ISD::TRUNCATE, N->getDebugLoc(), VT, XORNode);
}
if (VT == VT0 && VT == MVT::i1 && N1C && N1C->isNullValue()) {
SDValue NOTNode = DAG.getNOT(N0.getDebugLoc(), N0, VT);
AddToWorkList(NOTNode.getNode());
return DAG.getNode(ISD::AND, N->getDebugLoc(), VT, NOTNode, N2);
}
if (VT == VT0 && VT == MVT::i1 && N2C && N2C->getAPIntValue() == 1) {
SDValue NOTNode = DAG.getNOT(N0.getDebugLoc(), N0, VT);
AddToWorkList(NOTNode.getNode());
return DAG.getNode(ISD::OR, N->getDebugLoc(), VT, NOTNode, N1);
}
if (VT == MVT::i1 && N2C && N2C->isNullValue())
return DAG.getNode(ISD::AND, N->getDebugLoc(), VT, N0, N1);
if (VT == MVT::i1 && (N0 == N1 || (N1C && N1C->getAPIntValue() == 1)))
return DAG.getNode(ISD::OR, N->getDebugLoc(), VT, N0, N2);
if (VT == MVT::i1 && (N0 == N2 || (N2C && N2C->getAPIntValue() == 0)))
return DAG.getNode(ISD::AND, N->getDebugLoc(), VT, N0, N1);
if (SimplifySelectOps(N, N1, N2))
return SDValue(N, 0);
if (N0.getOpcode() == ISD::SETCC) {
if (TLI.isOperationLegalOrCustom(ISD::SELECT_CC, MVT::Other))
return DAG.getNode(ISD::SELECT_CC, N->getDebugLoc(), VT,
N0.getOperand(0), N0.getOperand(1),
N1, N2, N0.getOperand(2));
return SimplifySelect(N->getDebugLoc(), N0, N1, N2);
}
return SDValue();
}
SDValue DAGCombiner::visitSELECT_CC(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
SDValue N2 = N->getOperand(2);
SDValue N3 = N->getOperand(3);
SDValue N4 = N->getOperand(4);
ISD::CondCode CC = cast<CondCodeSDNode>(N4)->get();
if (N2 == N3)
return N2;
SDValue SCC = SimplifySetCC(TLI.getSetCCResultType(N0.getValueType()),
N0, N1, CC, N->getDebugLoc(), false);
if (SCC.getNode()) AddToWorkList(SCC.getNode());
if (ConstantSDNode *SCCC = dyn_cast_or_null<ConstantSDNode>(SCC.getNode())) {
if (!SCCC->isNullValue())
return N2; else
return N3; }
if (SCC.getNode() && SCC.getOpcode() == ISD::SETCC)
return DAG.getNode(ISD::SELECT_CC, N->getDebugLoc(), N2.getValueType(),
SCC.getOperand(0), SCC.getOperand(1), N2, N3,
SCC.getOperand(2));
if (SimplifySelectOps(N, N2, N3))
return SDValue(N, 0);
return SimplifySelectCC(N->getDebugLoc(), N0, N1, N2, N3, CC);
}
SDValue DAGCombiner::visitSETCC(SDNode *N) {
return SimplifySetCC(N->getValueType(0), N->getOperand(0), N->getOperand(1),
cast<CondCodeSDNode>(N->getOperand(2))->get(),
N->getDebugLoc());
}
static bool ExtendUsesToFormExtLoad(SDNode *N, SDValue N0,
unsigned ExtOpc,
SmallVector<SDNode*, 4> &ExtendNodes,
const TargetLowering &TLI) {
bool HasCopyToRegUses = false;
bool isTruncFree = TLI.isTruncateFree(N->getValueType(0), N0.getValueType());
for (SDNode::use_iterator UI = N0.getNode()->use_begin(),
UE = N0.getNode()->use_end();
UI != UE; ++UI) {
SDNode *User = *UI;
if (User == N)
continue;
if (UI.getUse().getResNo() != N0.getResNo())
continue;
if (ExtOpc != ISD::ANY_EXTEND && User->getOpcode() == ISD::SETCC) {
ISD::CondCode CC = cast<CondCodeSDNode>(User->getOperand(2))->get();
if (ExtOpc == ISD::ZERO_EXTEND && ISD::isSignedIntSetCC(CC))
return false;
bool Add = false;
for (unsigned i = 0; i != 2; ++i) {
SDValue UseOp = User->getOperand(i);
if (UseOp == N0)
continue;
if (!isa<ConstantSDNode>(UseOp))
return false;
Add = true;
}
if (Add)
ExtendNodes.push_back(User);
continue;
}
if (!isTruncFree)
return false;
if (User->getOpcode() == ISD::CopyToReg)
HasCopyToRegUses = true;
}
if (HasCopyToRegUses) {
bool BothLiveOut = false;
for (SDNode::use_iterator UI = N->use_begin(), UE = N->use_end();
UI != UE; ++UI) {
SDUse &Use = UI.getUse();
if (Use.getResNo() == 0 && Use.getUser()->getOpcode() == ISD::CopyToReg) {
BothLiveOut = true;
break;
}
}
if (BothLiveOut)
return ExtendNodes.size();
}
return true;
}
SDValue DAGCombiner::visitSIGN_EXTEND(SDNode *N) {
SDValue N0 = N->getOperand(0);
MVT VT = N->getValueType(0);
if (isa<ConstantSDNode>(N0))
return DAG.getNode(ISD::SIGN_EXTEND, N->getDebugLoc(), VT, N0);
if (N0.getOpcode() == ISD::SIGN_EXTEND || N0.getOpcode() == ISD::ANY_EXTEND)
return DAG.getNode(ISD::SIGN_EXTEND, N->getDebugLoc(), VT,
N0.getOperand(0));
if (N0.getOpcode() == ISD::TRUNCATE) {
SDValue NarrowLoad = ReduceLoadWidth(N0.getNode());
if (NarrowLoad.getNode()) {
if (NarrowLoad.getNode() != N0.getNode())
CombineTo(N0.getNode(), NarrowLoad);
return DAG.getNode(ISD::SIGN_EXTEND, N->getDebugLoc(), VT, NarrowLoad);
}
SDValue Op = N0.getOperand(0);
unsigned OpBits = Op.getValueType().getSizeInBits();
unsigned MidBits = N0.getValueType().getSizeInBits();
unsigned DestBits = VT.getSizeInBits();
unsigned NumSignBits = DAG.ComputeNumSignBits(Op);
if (OpBits == DestBits) {
if (NumSignBits > DestBits-MidBits)
return Op;
} else if (OpBits < DestBits) {
if (NumSignBits > OpBits-MidBits)
return DAG.getNode(ISD::SIGN_EXTEND, N->getDebugLoc(), VT, Op);
} else {
if (NumSignBits > OpBits-MidBits)
return DAG.getNode(ISD::TRUNCATE, N->getDebugLoc(), VT, Op);
}
if (!LegalOperations || TLI.isOperationLegal(ISD::SIGN_EXTEND_INREG,
N0.getValueType())) {
if (Op.getValueType().bitsLT(VT))
Op = DAG.getNode(ISD::ANY_EXTEND, N0.getDebugLoc(), VT, Op);
else if (Op.getValueType().bitsGT(VT))
Op = DAG.getNode(ISD::TRUNCATE, N0.getDebugLoc(), VT, Op);
return DAG.getNode(ISD::SIGN_EXTEND_INREG, N->getDebugLoc(), VT, Op,
DAG.getValueType(N0.getValueType()));
}
}
if (ISD::isNON_EXTLoad(N0.getNode()) &&
((!LegalOperations && !cast<LoadSDNode>(N0)->isVolatile()) ||
TLI.isLoadExtLegal(ISD::SEXTLOAD, N0.getValueType()))) {
bool DoXform = true;
SmallVector<SDNode*, 4> SetCCs;
if (!N0.hasOneUse())
DoXform = ExtendUsesToFormExtLoad(N, N0, ISD::SIGN_EXTEND, SetCCs, TLI);
if (DoXform) {
LoadSDNode *LN0 = cast<LoadSDNode>(N0);
SDValue ExtLoad = DAG.getExtLoad(ISD::SEXTLOAD, N->getDebugLoc(), VT,
LN0->getChain(),
LN0->getBasePtr(), LN0->getSrcValue(),
LN0->getSrcValueOffset(),
N0.getValueType(),
LN0->isVolatile(), LN0->getAlignment());
CombineTo(N, ExtLoad);
SDValue Trunc = DAG.getNode(ISD::TRUNCATE, N0.getDebugLoc(),
N0.getValueType(), ExtLoad);
CombineTo(N0.getNode(), Trunc, ExtLoad.getValue(1));
for (unsigned i = 0, e = SetCCs.size(); i != e; ++i) {
SDNode *SetCC = SetCCs[i];
SmallVector<SDValue, 4> Ops;
for (unsigned j = 0; j != 2; ++j) {
SDValue SOp = SetCC->getOperand(j);
if (SOp == Trunc)
Ops.push_back(ExtLoad);
else
Ops.push_back(DAG.getNode(ISD::SIGN_EXTEND,
N->getDebugLoc(), VT, SOp));
}
Ops.push_back(SetCC->getOperand(2));
CombineTo(SetCC, DAG.getNode(ISD::SETCC, N->getDebugLoc(),
SetCC->getValueType(0),
&Ops[0], Ops.size()));
}
return SDValue(N, 0); }
}
if ((ISD::isSEXTLoad(N0.getNode()) || ISD::isEXTLoad(N0.getNode())) &&
ISD::isUNINDEXEDLoad(N0.getNode()) && N0.hasOneUse()) {
LoadSDNode *LN0 = cast<LoadSDNode>(N0);
MVT EVT = LN0->getMemoryVT();
if ((!LegalOperations && !LN0->isVolatile()) ||
TLI.isLoadExtLegal(ISD::SEXTLOAD, EVT)) {
SDValue ExtLoad = DAG.getExtLoad(ISD::SEXTLOAD, N->getDebugLoc(), VT,
LN0->getChain(),
LN0->getBasePtr(), LN0->getSrcValue(),
LN0->getSrcValueOffset(), EVT,
LN0->isVolatile(), LN0->getAlignment());
CombineTo(N, ExtLoad);
CombineTo(N0.getNode(),
DAG.getNode(ISD::TRUNCATE, N0.getDebugLoc(),
N0.getValueType(), ExtLoad),
ExtLoad.getValue(1));
return SDValue(N, 0); }
}
if (N0.getOpcode() == ISD::SETCC) {
SDValue SCC =
SimplifySelectCC(N->getDebugLoc(), N0.getOperand(0), N0.getOperand(1),
DAG.getConstant(~0ULL, VT), DAG.getConstant(0, VT),
cast<CondCodeSDNode>(N0.getOperand(2))->get(), true);
if (SCC.getNode()) return SCC;
}
if ((!LegalOperations || TLI.isOperationLegal(ISD::ZERO_EXTEND, VT)) &&
DAG.SignBitIsZero(N0))
return DAG.getNode(ISD::ZERO_EXTEND, N->getDebugLoc(), VT, N0);
return SDValue();
}
SDValue DAGCombiner::visitZERO_EXTEND(SDNode *N) {
SDValue N0 = N->getOperand(0);
MVT VT = N->getValueType(0);
if (isa<ConstantSDNode>(N0))
return DAG.getNode(ISD::ZERO_EXTEND, N->getDebugLoc(), VT, N0);
if (N0.getOpcode() == ISD::ZERO_EXTEND || N0.getOpcode() == ISD::ANY_EXTEND)
return DAG.getNode(ISD::ZERO_EXTEND, N->getDebugLoc(), VT,
N0.getOperand(0));
if (N0.getOpcode() == ISD::TRUNCATE) {
SDValue NarrowLoad = ReduceLoadWidth(N0.getNode());
if (NarrowLoad.getNode()) {
if (NarrowLoad.getNode() != N0.getNode())
CombineTo(N0.getNode(), NarrowLoad);
return DAG.getNode(ISD::ZERO_EXTEND, N->getDebugLoc(), VT, NarrowLoad);
}
}
if (N0.getOpcode() == ISD::TRUNCATE &&
(!LegalOperations || TLI.isOperationLegal(ISD::AND, VT))) {
SDValue Op = N0.getOperand(0);
if (Op.getValueType().bitsLT(VT)) {
Op = DAG.getNode(ISD::ANY_EXTEND, N->getDebugLoc(), VT, Op);
} else if (Op.getValueType().bitsGT(VT)) {
Op = DAG.getNode(ISD::TRUNCATE, N->getDebugLoc(), VT, Op);
}
return DAG.getZeroExtendInReg(Op, N->getDebugLoc(), N0.getValueType());
}
if (N0.getOpcode() == ISD::AND &&
N0.getOperand(0).getOpcode() == ISD::TRUNCATE &&
N0.getOperand(1).getOpcode() == ISD::Constant &&
(!TLI.isTruncateFree(N0.getOperand(0).getOperand(0).getValueType(),
N0.getValueType()) ||
!TLI.isZExtFree(N0.getValueType(), VT))) {
SDValue X = N0.getOperand(0).getOperand(0);
if (X.getValueType().bitsLT(VT)) {
X = DAG.getNode(ISD::ANY_EXTEND, X.getDebugLoc(), VT, X);
} else if (X.getValueType().bitsGT(VT)) {
X = DAG.getNode(ISD::TRUNCATE, X.getDebugLoc(), VT, X);
}
APInt Mask = cast<ConstantSDNode>(N0.getOperand(1))->getAPIntValue();
Mask.zext(VT.getSizeInBits());
return DAG.getNode(ISD::AND, N->getDebugLoc(), VT,
X, DAG.getConstant(Mask, VT));
}
if (ISD::isNON_EXTLoad(N0.getNode()) &&
((!LegalOperations && !cast<LoadSDNode>(N0)->isVolatile()) ||
TLI.isLoadExtLegal(ISD::ZEXTLOAD, N0.getValueType()))) {
bool DoXform = true;
SmallVector<SDNode*, 4> SetCCs;
if (!N0.hasOneUse())
DoXform = ExtendUsesToFormExtLoad(N, N0, ISD::ZERO_EXTEND, SetCCs, TLI);
if (DoXform) {
LoadSDNode *LN0 = cast<LoadSDNode>(N0);
SDValue ExtLoad = DAG.getExtLoad(ISD::ZEXTLOAD, N->getDebugLoc(), VT,
LN0->getChain(),
LN0->getBasePtr(), LN0->getSrcValue(),
LN0->getSrcValueOffset(),
N0.getValueType(),
LN0->isVolatile(), LN0->getAlignment());
CombineTo(N, ExtLoad);
SDValue Trunc = DAG.getNode(ISD::TRUNCATE, N0.getDebugLoc(),
N0.getValueType(), ExtLoad);
CombineTo(N0.getNode(), Trunc, ExtLoad.getValue(1));
for (unsigned i = 0, e = SetCCs.size(); i != e; ++i) {
SDNode *SetCC = SetCCs[i];
SmallVector<SDValue, 4> Ops;
for (unsigned j = 0; j != 2; ++j) {
SDValue SOp = SetCC->getOperand(j);
if (SOp == Trunc)
Ops.push_back(ExtLoad);
else
Ops.push_back(DAG.getNode(ISD::ZERO_EXTEND,
N->getDebugLoc(), VT, SOp));
}
Ops.push_back(SetCC->getOperand(2));
CombineTo(SetCC, DAG.getNode(ISD::SETCC, N->getDebugLoc(),
SetCC->getValueType(0),
&Ops[0], Ops.size()));
}
return SDValue(N, 0); }
}
if ((ISD::isZEXTLoad(N0.getNode()) || ISD::isEXTLoad(N0.getNode())) &&
ISD::isUNINDEXEDLoad(N0.getNode()) && N0.hasOneUse()) {
LoadSDNode *LN0 = cast<LoadSDNode>(N0);
MVT EVT = LN0->getMemoryVT();
if ((!LegalOperations && !LN0->isVolatile()) ||
TLI.isLoadExtLegal(ISD::ZEXTLOAD, EVT)) {
SDValue ExtLoad = DAG.getExtLoad(ISD::ZEXTLOAD, N->getDebugLoc(), VT,
LN0->getChain(),
LN0->getBasePtr(), LN0->getSrcValue(),
LN0->getSrcValueOffset(), EVT,
LN0->isVolatile(), LN0->getAlignment());
CombineTo(N, ExtLoad);
CombineTo(N0.getNode(),
DAG.getNode(ISD::TRUNCATE, N0.getDebugLoc(), N0.getValueType(),
ExtLoad),
ExtLoad.getValue(1));
return SDValue(N, 0); }
}
if (N0.getOpcode() == ISD::SETCC) {
SDValue SCC =
SimplifySelectCC(N->getDebugLoc(), N0.getOperand(0), N0.getOperand(1),
DAG.getConstant(1, VT), DAG.getConstant(0, VT),
cast<CondCodeSDNode>(N0.getOperand(2))->get(), true);
if (SCC.getNode()) return SCC;
}
return SDValue();
}
SDValue DAGCombiner::visitANY_EXTEND(SDNode *N) {
SDValue N0 = N->getOperand(0);
MVT VT = N->getValueType(0);
if (isa<ConstantSDNode>(N0))
return DAG.getNode(ISD::ANY_EXTEND, N->getDebugLoc(), VT, N0);
if (N0.getOpcode() == ISD::ANY_EXTEND ||
N0.getOpcode() == ISD::ZERO_EXTEND ||
N0.getOpcode() == ISD::SIGN_EXTEND)
return DAG.getNode(N0.getOpcode(), N->getDebugLoc(), VT, N0.getOperand(0));
if (N0.getOpcode() == ISD::TRUNCATE) {
SDValue NarrowLoad = ReduceLoadWidth(N0.getNode());
if (NarrowLoad.getNode()) {
if (NarrowLoad.getNode() != N0.getNode())
CombineTo(N0.getNode(), NarrowLoad);
return DAG.getNode(ISD::ANY_EXTEND, N->getDebugLoc(), VT, NarrowLoad);
}
}
if (N0.getOpcode() == ISD::TRUNCATE) {
SDValue TruncOp = N0.getOperand(0);
if (TruncOp.getValueType() == VT)
return TruncOp; if (TruncOp.getValueType().bitsGT(VT))
return DAG.getNode(ISD::TRUNCATE, N->getDebugLoc(), VT, TruncOp);
return DAG.getNode(ISD::ANY_EXTEND, N->getDebugLoc(), VT, TruncOp);
}
if (N0.getOpcode() == ISD::AND &&
N0.getOperand(0).getOpcode() == ISD::TRUNCATE &&
N0.getOperand(1).getOpcode() == ISD::Constant &&
!TLI.isTruncateFree(N0.getOperand(0).getOperand(0).getValueType(),
N0.getValueType())) {
SDValue X = N0.getOperand(0).getOperand(0);
if (X.getValueType().bitsLT(VT)) {
X = DAG.getNode(ISD::ANY_EXTEND, N->getDebugLoc(), VT, X);
} else if (X.getValueType().bitsGT(VT)) {
X = DAG.getNode(ISD::TRUNCATE, N->getDebugLoc(), VT, X);
}
APInt Mask = cast<ConstantSDNode>(N0.getOperand(1))->getAPIntValue();
Mask.zext(VT.getSizeInBits());
return DAG.getNode(ISD::AND, N->getDebugLoc(), VT,
X, DAG.getConstant(Mask, VT));
}
if (ISD::isNON_EXTLoad(N0.getNode()) &&
((!LegalOperations && !cast<LoadSDNode>(N0)->isVolatile()) ||
TLI.isLoadExtLegal(ISD::EXTLOAD, N0.getValueType()))) {
bool DoXform = true;
SmallVector<SDNode*, 4> SetCCs;
if (!N0.hasOneUse())
DoXform = ExtendUsesToFormExtLoad(N, N0, ISD::ANY_EXTEND, SetCCs, TLI);
if (DoXform) {
LoadSDNode *LN0 = cast<LoadSDNode>(N0);
SDValue ExtLoad = DAG.getExtLoad(ISD::EXTLOAD, N->getDebugLoc(), VT,
LN0->getChain(),
LN0->getBasePtr(), LN0->getSrcValue(),
LN0->getSrcValueOffset(),
N0.getValueType(),
LN0->isVolatile(), LN0->getAlignment());
CombineTo(N, ExtLoad);
SDValue Trunc = DAG.getNode(ISD::TRUNCATE, N0.getDebugLoc(),
N0.getValueType(), ExtLoad);
CombineTo(N0.getNode(), Trunc, ExtLoad.getValue(1));
for (unsigned i = 0, e = SetCCs.size(); i != e; ++i) {
SDNode *SetCC = SetCCs[i];
SmallVector<SDValue, 4> Ops;
for (unsigned j = 0; j != 2; ++j) {
SDValue SOp = SetCC->getOperand(j);
if (SOp == Trunc)
Ops.push_back(ExtLoad);
else
Ops.push_back(DAG.getNode(ISD::ANY_EXTEND,
N->getDebugLoc(), VT, SOp));
}
Ops.push_back(SetCC->getOperand(2));
CombineTo(SetCC, DAG.getNode(ISD::SETCC, N->getDebugLoc(),
SetCC->getValueType(0),
&Ops[0], Ops.size()));
}
return SDValue(N, 0); }
}
if (N0.getOpcode() == ISD::LOAD &&
!ISD::isNON_EXTLoad(N0.getNode()) && ISD::isUNINDEXEDLoad(N0.getNode()) &&
N0.hasOneUse()) {
LoadSDNode *LN0 = cast<LoadSDNode>(N0);
MVT EVT = LN0->getMemoryVT();
SDValue ExtLoad = DAG.getExtLoad(LN0->getExtensionType(), N->getDebugLoc(),
VT, LN0->getChain(), LN0->getBasePtr(),
LN0->getSrcValue(),
LN0->getSrcValueOffset(), EVT,
LN0->isVolatile(), LN0->getAlignment());
CombineTo(N, ExtLoad);
CombineTo(N0.getNode(),
DAG.getNode(ISD::TRUNCATE, N0.getDebugLoc(),
N0.getValueType(), ExtLoad),
ExtLoad.getValue(1));
return SDValue(N, 0); }
if (N0.getOpcode() == ISD::SETCC) {
SDValue SCC =
SimplifySelectCC(N->getDebugLoc(), N0.getOperand(0), N0.getOperand(1),
DAG.getConstant(1, VT), DAG.getConstant(0, VT),
cast<CondCodeSDNode>(N0.getOperand(2))->get(), true);
if (SCC.getNode())
return SCC;
}
return SDValue();
}
SDValue DAGCombiner::GetDemandedBits(SDValue V, const APInt &Mask) {
switch (V.getOpcode()) {
default: break;
case ISD::OR:
case ISD::XOR:
if (DAG.MaskedValueIsZero(V.getOperand(0), Mask))
return V.getOperand(1);
if (DAG.MaskedValueIsZero(V.getOperand(1), Mask))
return V.getOperand(0);
break;
case ISD::SRL:
if (!V.getNode()->hasOneUse())
break;
if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(V.getOperand(1))) {
unsigned Amt = RHSC->getZExtValue();
if (Amt >= Mask.getBitWidth()) break;
APInt NewMask = Mask << Amt;
SDValue SimplifyLHS = GetDemandedBits(V.getOperand(0), NewMask);
if (SimplifyLHS.getNode())
return DAG.getNode(ISD::SRL, V.getDebugLoc(), V.getValueType(),
SimplifyLHS, V.getOperand(1));
}
}
return SDValue();
}
SDValue DAGCombiner::ReduceLoadWidth(SDNode *N) {
unsigned Opc = N->getOpcode();
ISD::LoadExtType ExtType = ISD::NON_EXTLOAD;
SDValue N0 = N->getOperand(0);
MVT VT = N->getValueType(0);
MVT EVT = VT;
if (VT.isVector())
return SDValue();
if (Opc == ISD::SIGN_EXTEND_INREG) {
ExtType = ISD::SEXTLOAD;
EVT = cast<VTSDNode>(N->getOperand(1))->getVT();
if (LegalOperations && !TLI.isLoadExtLegal(ISD::SEXTLOAD, EVT))
return SDValue();
}
unsigned EVTBits = EVT.getSizeInBits();
unsigned ShAmt = 0;
if (N0.getOpcode() == ISD::SRL && N0.hasOneUse()) {
if (ConstantSDNode *N01 = dyn_cast<ConstantSDNode>(N0.getOperand(1))) {
ShAmt = N01->getZExtValue();
if ((ShAmt & (EVTBits-1)) == 0) {
N0 = N0.getOperand(0);
if (N0.getValueType().getSizeInBits() <= EVTBits)
return SDValue();
}
}
}
if (isa<LoadSDNode>(N0) && N0.hasOneUse() && EVT.isRound() &&
cast<LoadSDNode>(N0)->getMemoryVT().getSizeInBits() > EVTBits &&
!cast<LoadSDNode>(N0)->isVolatile()) {
LoadSDNode *LN0 = cast<LoadSDNode>(N0);
MVT PtrType = N0.getOperand(1).getValueType();
if (TLI.isBigEndian()) {
unsigned LVTStoreBits = LN0->getMemoryVT().getStoreSizeInBits();
unsigned EVTStoreBits = EVT.getStoreSizeInBits();
ShAmt = LVTStoreBits - EVTStoreBits - ShAmt;
}
uint64_t PtrOff = ShAmt / 8;
unsigned NewAlign = MinAlign(LN0->getAlignment(), PtrOff);
SDValue NewPtr = DAG.getNode(ISD::ADD, LN0->getDebugLoc(),
PtrType, LN0->getBasePtr(),
DAG.getConstant(PtrOff, PtrType));
AddToWorkList(NewPtr.getNode());
SDValue Load = (ExtType == ISD::NON_EXTLOAD)
? DAG.getLoad(VT, N0.getDebugLoc(), LN0->getChain(), NewPtr,
LN0->getSrcValue(), LN0->getSrcValueOffset() + PtrOff,
LN0->isVolatile(), NewAlign)
: DAG.getExtLoad(ExtType, N0.getDebugLoc(), VT, LN0->getChain(), NewPtr,
LN0->getSrcValue(), LN0->getSrcValueOffset() + PtrOff,
EVT, LN0->isVolatile(), NewAlign);
WorkListRemover DeadNodes(*this);
DAG.ReplaceAllUsesOfValueWith(N0.getValue(1), Load.getValue(1),
&DeadNodes);
return Load;
}
return SDValue();
}
SDValue DAGCombiner::visitSIGN_EXTEND_INREG(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
MVT VT = N->getValueType(0);
MVT EVT = cast<VTSDNode>(N1)->getVT();
unsigned VTBits = VT.getSizeInBits();
unsigned EVTBits = EVT.getSizeInBits();
if (isa<ConstantSDNode>(N0) || N0.getOpcode() == ISD::UNDEF)
return DAG.getNode(ISD::SIGN_EXTEND_INREG, N->getDebugLoc(), VT, N0, N1);
if (DAG.ComputeNumSignBits(N0) >= VT.getSizeInBits()-EVTBits+1)
return N0;
if (N0.getOpcode() == ISD::SIGN_EXTEND_INREG &&
EVT.bitsLT(cast<VTSDNode>(N0.getOperand(1))->getVT())) {
return DAG.getNode(ISD::SIGN_EXTEND_INREG, N->getDebugLoc(), VT,
N0.getOperand(0), N1);
}
if (N0.getOpcode() == ISD::SIGN_EXTEND || N0.getOpcode() == ISD::ANY_EXTEND) {
SDValue N00 = N0.getOperand(0);
if (N00.getValueType().getSizeInBits() < EVTBits)
return DAG.getNode(ISD::SIGN_EXTEND, N->getDebugLoc(), VT, N00, N1);
}
if (DAG.MaskedValueIsZero(N0, APInt::getBitsSet(VTBits, EVTBits-1, EVTBits)))
return DAG.getZeroExtendInReg(N0, N->getDebugLoc(), EVT);
if (SimplifyDemandedBits(SDValue(N, 0)))
return SDValue(N, 0);
SDValue NarrowLoad = ReduceLoadWidth(N);
if (NarrowLoad.getNode())
return NarrowLoad;
if (N0.getOpcode() == ISD::SRL) {
if (ConstantSDNode *ShAmt = dyn_cast<ConstantSDNode>(N0.getOperand(1)))
if (ShAmt->getZExtValue()+EVTBits <= VT.getSizeInBits()) {
unsigned InSignBits = DAG.ComputeNumSignBits(N0.getOperand(0));
if (VT.getSizeInBits()-(ShAmt->getZExtValue()+EVTBits) < InSignBits)
return DAG.getNode(ISD::SRA, N->getDebugLoc(), VT,
N0.getOperand(0), N0.getOperand(1));
}
}
if (ISD::isEXTLoad(N0.getNode()) &&
ISD::isUNINDEXEDLoad(N0.getNode()) &&
EVT == cast<LoadSDNode>(N0)->getMemoryVT() &&
((!LegalOperations && !cast<LoadSDNode>(N0)->isVolatile()) ||
TLI.isLoadExtLegal(ISD::SEXTLOAD, EVT))) {
LoadSDNode *LN0 = cast<LoadSDNode>(N0);
SDValue ExtLoad = DAG.getExtLoad(ISD::SEXTLOAD, N->getDebugLoc(), VT,
LN0->getChain(),
LN0->getBasePtr(), LN0->getSrcValue(),
LN0->getSrcValueOffset(), EVT,
LN0->isVolatile(), LN0->getAlignment());
CombineTo(N, ExtLoad);
CombineTo(N0.getNode(), ExtLoad, ExtLoad.getValue(1));
return SDValue(N, 0); }
if (ISD::isZEXTLoad(N0.getNode()) && ISD::isUNINDEXEDLoad(N0.getNode()) &&
N0.hasOneUse() &&
EVT == cast<LoadSDNode>(N0)->getMemoryVT() &&
((!LegalOperations && !cast<LoadSDNode>(N0)->isVolatile()) ||
TLI.isLoadExtLegal(ISD::SEXTLOAD, EVT))) {
LoadSDNode *LN0 = cast<LoadSDNode>(N0);
SDValue ExtLoad = DAG.getExtLoad(ISD::SEXTLOAD, N->getDebugLoc(), VT,
LN0->getChain(),
LN0->getBasePtr(), LN0->getSrcValue(),
LN0->getSrcValueOffset(), EVT,
LN0->isVolatile(), LN0->getAlignment());
CombineTo(N, ExtLoad);
CombineTo(N0.getNode(), ExtLoad, ExtLoad.getValue(1));
return SDValue(N, 0); }
return SDValue();
}
SDValue DAGCombiner::visitTRUNCATE(SDNode *N) {
SDValue N0 = N->getOperand(0);
MVT VT = N->getValueType(0);
if (N0.getValueType() == N->getValueType(0))
return N0;
if (isa<ConstantSDNode>(N0))
return DAG.getNode(ISD::TRUNCATE, N->getDebugLoc(), VT, N0);
if (N0.getOpcode() == ISD::TRUNCATE)
return DAG.getNode(ISD::TRUNCATE, N->getDebugLoc(), VT, N0.getOperand(0));
if (N0.getOpcode() == ISD::ZERO_EXTEND || N0.getOpcode() == ISD::SIGN_EXTEND||
N0.getOpcode() == ISD::ANY_EXTEND) {
if (N0.getOperand(0).getValueType().bitsLT(VT))
return DAG.getNode(N0.getOpcode(), N->getDebugLoc(), VT,
N0.getOperand(0));
else if (N0.getOperand(0).getValueType().bitsGT(VT))
return DAG.getNode(ISD::TRUNCATE, N->getDebugLoc(), VT, N0.getOperand(0));
else
return N0.getOperand(0);
}
SDValue Shorter =
GetDemandedBits(N0, APInt::getLowBitsSet(N0.getValueSizeInBits(),
VT.getSizeInBits()));
if (Shorter.getNode())
return DAG.getNode(ISD::TRUNCATE, N->getDebugLoc(), VT, Shorter);
return ReduceLoadWidth(N);
}
static SDNode *getBuildPairElt(SDNode *N, unsigned i) {
SDValue Elt = N->getOperand(i);
if (Elt.getOpcode() != ISD::MERGE_VALUES)
return Elt.getNode();
return Elt.getOperand(Elt.getResNo()).getNode();
}
SDValue DAGCombiner::CombineConsecutiveLoads(SDNode *N, MVT VT) {
assert(N->getOpcode() == ISD::BUILD_PAIR);
LoadSDNode *LD1 = dyn_cast<LoadSDNode>(getBuildPairElt(N, 0));
LoadSDNode *LD2 = dyn_cast<LoadSDNode>(getBuildPairElt(N, 1));
if (!LD1 || !LD2 || !ISD::isNON_EXTLoad(LD1) || !LD1->hasOneUse())
return SDValue();
MVT LD1VT = LD1->getValueType(0);
const MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
if (ISD::isNON_EXTLoad(LD2) &&
LD2->hasOneUse() &&
!LD1->isVolatile() &&
!LD2->isVolatile() &&
TLI.isConsecutiveLoad(LD2, LD1, LD1VT.getSizeInBits()/8, 1, MFI)) {
unsigned Align = LD1->getAlignment();
unsigned NewAlign = TLI.getTargetData()->
getABITypeAlignment(VT.getTypeForMVT());
if (NewAlign <= Align &&
(!LegalOperations || TLI.isOperationLegal(ISD::LOAD, VT)))
return DAG.getLoad(VT, N->getDebugLoc(), LD1->getChain(),
LD1->getBasePtr(), LD1->getSrcValue(),
LD1->getSrcValueOffset(), false, Align);
}
return SDValue();
}
SDValue DAGCombiner::visitBIT_CONVERT(SDNode *N) {
SDValue N0 = N->getOperand(0);
MVT VT = N->getValueType(0);
if (!LegalTypes &&
N0.getOpcode() == ISD::BUILD_VECTOR && N0.getNode()->hasOneUse() &&
VT.isVector()) {
bool isSimple = true;
for (unsigned i = 0, e = N0.getNumOperands(); i != e; ++i)
if (N0.getOperand(i).getOpcode() != ISD::UNDEF &&
N0.getOperand(i).getOpcode() != ISD::Constant &&
N0.getOperand(i).getOpcode() != ISD::ConstantFP) {
isSimple = false;
break;
}
MVT DestEltVT = N->getValueType(0).getVectorElementType();
assert(!DestEltVT.isVector() &&
"Element type of vector ValueType must not be vector!");
if (isSimple)
return ConstantFoldBIT_CONVERTofBUILD_VECTOR(N0.getNode(), DestEltVT);
}
if (isa<ConstantSDNode>(N0) || isa<ConstantFPSDNode>(N0)) {
SDValue Res = DAG.getNode(ISD::BIT_CONVERT, N->getDebugLoc(), VT, N0);
if (Res.getNode() != N) return Res;
}
if (N0.getOpcode() == ISD::BIT_CONVERT)
return DAG.getNode(ISD::BIT_CONVERT, N->getDebugLoc(), VT,
N0.getOperand(0));
if (ISD::isNormalLoad(N0.getNode()) && N0.hasOneUse() &&
!cast<LoadSDNode>(N0)->isVolatile() &&
(!LegalOperations || TLI.isOperationLegal(ISD::LOAD, VT))) {
LoadSDNode *LN0 = cast<LoadSDNode>(N0);
unsigned Align = TLI.getTargetData()->
getABITypeAlignment(VT.getTypeForMVT());
unsigned OrigAlign = LN0->getAlignment();
if (Align <= OrigAlign) {
SDValue Load = DAG.getLoad(VT, N->getDebugLoc(), LN0->getChain(),
LN0->getBasePtr(),
LN0->getSrcValue(), LN0->getSrcValueOffset(),
LN0->isVolatile(), OrigAlign);
AddToWorkList(N);
CombineTo(N0.getNode(),
DAG.getNode(ISD::BIT_CONVERT, N0.getDebugLoc(),
N0.getValueType(), Load),
Load.getValue(1));
return Load;
}
}
if ((N0.getOpcode() == ISD::FNEG || N0.getOpcode() == ISD::FABS) &&
N0.getNode()->hasOneUse() && VT.isInteger() && !VT.isVector()) {
SDValue NewConv = DAG.getNode(ISD::BIT_CONVERT, N0.getDebugLoc(), VT,
N0.getOperand(0));
AddToWorkList(NewConv.getNode());
APInt SignBit = APInt::getSignBit(VT.getSizeInBits());
if (N0.getOpcode() == ISD::FNEG)
return DAG.getNode(ISD::XOR, N->getDebugLoc(), VT,
NewConv, DAG.getConstant(SignBit, VT));
assert(N0.getOpcode() == ISD::FABS);
return DAG.getNode(ISD::AND, N->getDebugLoc(), VT,
NewConv, DAG.getConstant(~SignBit, VT));
}
if (N0.getOpcode() == ISD::FCOPYSIGN && N0.getNode()->hasOneUse() &&
isa<ConstantFPSDNode>(N0.getOperand(0)) &&
VT.isInteger() && !VT.isVector()) {
unsigned OrigXWidth = N0.getOperand(1).getValueType().getSizeInBits();
MVT IntXVT = MVT::getIntegerVT(OrigXWidth);
if (TLI.isTypeLegal(IntXVT) || !LegalTypes) {
SDValue X = DAG.getNode(ISD::BIT_CONVERT, N0.getDebugLoc(),
IntXVT, N0.getOperand(1));
AddToWorkList(X.getNode());
unsigned VTWidth = VT.getSizeInBits();
if (OrigXWidth < VTWidth) {
X = DAG.getNode(ISD::SIGN_EXTEND, N->getDebugLoc(), VT, X);
AddToWorkList(X.getNode());
} else if (OrigXWidth > VTWidth) {
X = DAG.getNode(ISD::SRL, X.getDebugLoc(),
X.getValueType(), X,
DAG.getConstant(OrigXWidth-VTWidth, X.getValueType()));
AddToWorkList(X.getNode());
X = DAG.getNode(ISD::TRUNCATE, X.getDebugLoc(), VT, X);
AddToWorkList(X.getNode());
}
APInt SignBit = APInt::getSignBit(VT.getSizeInBits());
X = DAG.getNode(ISD::AND, X.getDebugLoc(), VT,
X, DAG.getConstant(SignBit, VT));
AddToWorkList(X.getNode());
SDValue Cst = DAG.getNode(ISD::BIT_CONVERT, N0.getDebugLoc(),
VT, N0.getOperand(0));
Cst = DAG.getNode(ISD::AND, Cst.getDebugLoc(), VT,
Cst, DAG.getConstant(~SignBit, VT));
AddToWorkList(Cst.getNode());
return DAG.getNode(ISD::OR, N->getDebugLoc(), VT, X, Cst);
}
}
if (N0.getOpcode() == ISD::BUILD_PAIR) {
SDValue CombineLD = CombineConsecutiveLoads(N0.getNode(), VT);
if (CombineLD.getNode())
return CombineLD;
}
return SDValue();
}
SDValue DAGCombiner::visitBUILD_PAIR(SDNode *N) {
MVT VT = N->getValueType(0);
return CombineConsecutiveLoads(N, VT);
}
SDValue DAGCombiner::
ConstantFoldBIT_CONVERTofBUILD_VECTOR(SDNode *BV, MVT DstEltVT) {
MVT SrcEltVT = BV->getValueType(0).getVectorElementType();
if (SrcEltVT == DstEltVT) return SDValue(BV, 0);
unsigned SrcBitSize = SrcEltVT.getSizeInBits();
unsigned DstBitSize = DstEltVT.getSizeInBits();
if (SrcBitSize == DstBitSize) {
SmallVector<SDValue, 8> Ops;
for (unsigned i = 0, e = BV->getNumOperands(); i != e; ++i) {
SDValue Op = BV->getOperand(i);
if (Op.getValueType() != SrcEltVT)
Op = DAG.getNode(ISD::TRUNCATE, BV->getDebugLoc(), SrcEltVT, Op);
Ops.push_back(DAG.getNode(ISD::BIT_CONVERT, BV->getDebugLoc(),
DstEltVT, Op));
AddToWorkList(Ops.back().getNode());
}
MVT VT = MVT::getVectorVT(DstEltVT,
BV->getValueType(0).getVectorNumElements());
return DAG.getNode(ISD::BUILD_VECTOR, BV->getDebugLoc(), VT,
&Ops[0], Ops.size());
}
if (SrcEltVT.isFloatingPoint()) {
assert((SrcEltVT == MVT::f32 || SrcEltVT == MVT::f64) && "Unknown FP VT!");
MVT IntVT = MVT::getIntegerVT(SrcEltVT.getSizeInBits());
BV = ConstantFoldBIT_CONVERTofBUILD_VECTOR(BV, IntVT).getNode();
SrcEltVT = IntVT;
}
if (DstEltVT.isFloatingPoint()) {
assert((DstEltVT == MVT::f32 || DstEltVT == MVT::f64) && "Unknown FP VT!");
MVT TmpVT = MVT::getIntegerVT(DstEltVT.getSizeInBits());
SDNode *Tmp = ConstantFoldBIT_CONVERTofBUILD_VECTOR(BV, TmpVT).getNode();
return ConstantFoldBIT_CONVERTofBUILD_VECTOR(Tmp, DstEltVT);
}
assert(SrcEltVT.isInteger() && DstEltVT.isInteger());
if (SrcBitSize < DstBitSize) {
unsigned NumInputsPerOutput = DstBitSize/SrcBitSize;
SmallVector<SDValue, 8> Ops;
for (unsigned i = 0, e = BV->getNumOperands(); i != e;
i += NumInputsPerOutput) {
bool isLE = TLI.isLittleEndian();
APInt NewBits = APInt(DstBitSize, 0);
bool EltIsUndef = true;
for (unsigned j = 0; j != NumInputsPerOutput; ++j) {
NewBits <<= SrcBitSize;
SDValue Op = BV->getOperand(i+ (isLE ? (NumInputsPerOutput-j-1) : j));
if (Op.getOpcode() == ISD::UNDEF) continue;
EltIsUndef = false;
NewBits |= (APInt(cast<ConstantSDNode>(Op)->getAPIntValue()).
zextOrTrunc(SrcBitSize).zext(DstBitSize));
}
if (EltIsUndef)
Ops.push_back(DAG.getUNDEF(DstEltVT));
else
Ops.push_back(DAG.getConstant(NewBits, DstEltVT));
}
MVT VT = MVT::getVectorVT(DstEltVT, Ops.size());
return DAG.getNode(ISD::BUILD_VECTOR, BV->getDebugLoc(), VT,
&Ops[0], Ops.size());
}
bool isS2V = ISD::isScalarToVector(BV);
unsigned NumOutputsPerInput = SrcBitSize/DstBitSize;
MVT VT = MVT::getVectorVT(DstEltVT, NumOutputsPerInput*BV->getNumOperands());
SmallVector<SDValue, 8> Ops;
for (unsigned i = 0, e = BV->getNumOperands(); i != e; ++i) {
if (BV->getOperand(i).getOpcode() == ISD::UNDEF) {
for (unsigned j = 0; j != NumOutputsPerInput; ++j)
Ops.push_back(DAG.getUNDEF(DstEltVT));
continue;
}
APInt OpVal = APInt(cast<ConstantSDNode>(BV->getOperand(i))->
getAPIntValue()).zextOrTrunc(SrcBitSize);
for (unsigned j = 0; j != NumOutputsPerInput; ++j) {
APInt ThisVal = APInt(OpVal).trunc(DstBitSize);
Ops.push_back(DAG.getConstant(ThisVal, DstEltVT));
if (isS2V && i == 0 && j == 0 && APInt(ThisVal).zext(SrcBitSize) == OpVal)
return DAG.getNode(ISD::SCALAR_TO_VECTOR, BV->getDebugLoc(), VT,
Ops[0]);
OpVal = OpVal.lshr(DstBitSize);
}
if (TLI.isBigEndian())
std::reverse(Ops.end()-NumOutputsPerInput, Ops.end());
}
return DAG.getNode(ISD::BUILD_VECTOR, BV->getDebugLoc(), VT,
&Ops[0], Ops.size());
}
SDValue DAGCombiner::visitFADD(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0);
ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1);
MVT VT = N->getValueType(0);
if (VT.isVector()) {
SDValue FoldedVOp = SimplifyVBinOp(N);
if (FoldedVOp.getNode()) return FoldedVOp;
}
if (N0CFP && N1CFP && VT != MVT::ppcf128)
return DAG.getNode(ISD::FADD, N->getDebugLoc(), VT, N0, N1);
if (N0CFP && !N1CFP)
return DAG.getNode(ISD::FADD, N->getDebugLoc(), VT, N1, N0);
if (UnsafeFPMath && N1CFP && N1CFP->getValueAPF().isZero())
return N0;
if (isNegatibleForFree(N1, LegalOperations) == 2)
return DAG.getNode(ISD::FSUB, N->getDebugLoc(), VT, N0,
GetNegatedExpression(N1, DAG, LegalOperations));
if (isNegatibleForFree(N0, LegalOperations) == 2)
return DAG.getNode(ISD::FSUB, N->getDebugLoc(), VT, N1,
GetNegatedExpression(N0, DAG, LegalOperations));
if (UnsafeFPMath && N1CFP && N0.getOpcode() == ISD::FADD &&
N0.getNode()->hasOneUse() && isa<ConstantFPSDNode>(N0.getOperand(1)))
return DAG.getNode(ISD::FADD, N->getDebugLoc(), VT, N0.getOperand(0),
DAG.getNode(ISD::FADD, N->getDebugLoc(), VT,
N0.getOperand(1), N1));
return SDValue();
}
SDValue DAGCombiner::visitFSUB(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0);
ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1);
MVT VT = N->getValueType(0);
if (VT.isVector()) {
SDValue FoldedVOp = SimplifyVBinOp(N);
if (FoldedVOp.getNode()) return FoldedVOp;
}
if (N0CFP && N1CFP && VT != MVT::ppcf128)
return DAG.getNode(ISD::FSUB, N->getDebugLoc(), VT, N0, N1);
if (UnsafeFPMath && N1CFP && N1CFP->getValueAPF().isZero())
return N0;
if (UnsafeFPMath && N0CFP && N0CFP->getValueAPF().isZero()) {
if (isNegatibleForFree(N1, LegalOperations))
return GetNegatedExpression(N1, DAG, LegalOperations);
if (!LegalOperations || TLI.isOperationLegal(ISD::FNEG, VT))
return DAG.getNode(ISD::FNEG, N->getDebugLoc(), VT, N1);
}
if (isNegatibleForFree(N1, LegalOperations))
return DAG.getNode(ISD::FADD, N->getDebugLoc(), VT, N0,
GetNegatedExpression(N1, DAG, LegalOperations));
return SDValue();
}
SDValue DAGCombiner::visitFMUL(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0);
ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1);
MVT VT = N->getValueType(0);
if (VT.isVector()) {
SDValue FoldedVOp = SimplifyVBinOp(N);
if (FoldedVOp.getNode()) return FoldedVOp;
}
if (N0CFP && N1CFP && VT != MVT::ppcf128)
return DAG.getNode(ISD::FMUL, N->getDebugLoc(), VT, N0, N1);
if (N0CFP && !N1CFP)
return DAG.getNode(ISD::FMUL, N->getDebugLoc(), VT, N1, N0);
if (UnsafeFPMath && N1CFP && N1CFP->getValueAPF().isZero())
return N1;
if (N1CFP && N1CFP->isExactlyValue(+2.0))
return DAG.getNode(ISD::FADD, N->getDebugLoc(), VT, N0, N0);
if (N1CFP && N1CFP->isExactlyValue(-1.0))
if (!LegalOperations || TLI.isOperationLegal(ISD::FNEG, VT))
return DAG.getNode(ISD::FNEG, N->getDebugLoc(), VT, N0);
if (char LHSNeg = isNegatibleForFree(N0, LegalOperations)) {
if (char RHSNeg = isNegatibleForFree(N1, LegalOperations)) {
if (LHSNeg == 2 || RHSNeg == 2)
return DAG.getNode(ISD::FMUL, N->getDebugLoc(), VT,
GetNegatedExpression(N0, DAG, LegalOperations),
GetNegatedExpression(N1, DAG, LegalOperations));
}
}
if (UnsafeFPMath && N1CFP && N0.getOpcode() == ISD::FMUL &&
N0.getNode()->hasOneUse() && isa<ConstantFPSDNode>(N0.getOperand(1)))
return DAG.getNode(ISD::FMUL, N->getDebugLoc(), VT, N0.getOperand(0),
DAG.getNode(ISD::FMUL, N->getDebugLoc(), VT,
N0.getOperand(1), N1));
return SDValue();
}
SDValue DAGCombiner::visitFDIV(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0);
ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1);
MVT VT = N->getValueType(0);
if (VT.isVector()) {
SDValue FoldedVOp = SimplifyVBinOp(N);
if (FoldedVOp.getNode()) return FoldedVOp;
}
if (N0CFP && N1CFP && VT != MVT::ppcf128)
return DAG.getNode(ISD::FDIV, N->getDebugLoc(), VT, N0, N1);
if (char LHSNeg = isNegatibleForFree(N0, LegalOperations)) {
if (char RHSNeg = isNegatibleForFree(N1, LegalOperations)) {
if (LHSNeg == 2 || RHSNeg == 2)
return DAG.getNode(ISD::FDIV, N->getDebugLoc(), VT,
GetNegatedExpression(N0, DAG, LegalOperations),
GetNegatedExpression(N1, DAG, LegalOperations));
}
}
return SDValue();
}
SDValue DAGCombiner::visitFREM(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0);
ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1);
MVT VT = N->getValueType(0);
if (N0CFP && N1CFP && VT != MVT::ppcf128)
return DAG.getNode(ISD::FREM, N->getDebugLoc(), VT, N0, N1);
return SDValue();
}
SDValue DAGCombiner::visitFCOPYSIGN(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0);
ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1);
MVT VT = N->getValueType(0);
if (N0CFP && N1CFP && VT != MVT::ppcf128) return DAG.getNode(ISD::FCOPYSIGN, N->getDebugLoc(), VT, N0, N1);
if (N1CFP) {
const APFloat& V = N1CFP->getValueAPF();
if (!V.isNegative()) {
if (!LegalOperations || TLI.isOperationLegal(ISD::FABS, VT))
return DAG.getNode(ISD::FABS, N->getDebugLoc(), VT, N0);
} else {
if (!LegalOperations || TLI.isOperationLegal(ISD::FNEG, VT))
return DAG.getNode(ISD::FNEG, N->getDebugLoc(), VT,
DAG.getNode(ISD::FABS, N0.getDebugLoc(), VT, N0));
}
}
if (N0.getOpcode() == ISD::FABS || N0.getOpcode() == ISD::FNEG ||
N0.getOpcode() == ISD::FCOPYSIGN)
return DAG.getNode(ISD::FCOPYSIGN, N->getDebugLoc(), VT,
N0.getOperand(0), N1);
if (N1.getOpcode() == ISD::FABS)
return DAG.getNode(ISD::FABS, N->getDebugLoc(), VT, N0);
if (N1.getOpcode() == ISD::FCOPYSIGN)
return DAG.getNode(ISD::FCOPYSIGN, N->getDebugLoc(), VT,
N0, N1.getOperand(1));
if (N1.getOpcode() == ISD::FP_EXTEND || N1.getOpcode() == ISD::FP_ROUND)
return DAG.getNode(ISD::FCOPYSIGN, N->getDebugLoc(), VT,
N0, N1.getOperand(0));
return SDValue();
}
SDValue DAGCombiner::visitSINT_TO_FP(SDNode *N) {
SDValue N0 = N->getOperand(0);
ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
MVT VT = N->getValueType(0);
MVT OpVT = N0.getValueType();
if (N0C && OpVT != MVT::ppcf128)
return DAG.getNode(ISD::SINT_TO_FP, N->getDebugLoc(), VT, N0);
if (!TLI.isOperationLegalOrCustom(ISD::SINT_TO_FP, OpVT) &&
TLI.isOperationLegalOrCustom(ISD::UINT_TO_FP, OpVT)) {
if (DAG.SignBitIsZero(N0))
return DAG.getNode(ISD::UINT_TO_FP, N->getDebugLoc(), VT, N0);
}
return SDValue();
}
SDValue DAGCombiner::visitUINT_TO_FP(SDNode *N) {
SDValue N0 = N->getOperand(0);
ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
MVT VT = N->getValueType(0);
MVT OpVT = N0.getValueType();
if (N0C && OpVT != MVT::ppcf128)
return DAG.getNode(ISD::UINT_TO_FP, N->getDebugLoc(), VT, N0);
if (!TLI.isOperationLegalOrCustom(ISD::UINT_TO_FP, OpVT) &&
TLI.isOperationLegalOrCustom(ISD::SINT_TO_FP, OpVT)) {
if (DAG.SignBitIsZero(N0))
return DAG.getNode(ISD::SINT_TO_FP, N->getDebugLoc(), VT, N0);
}
return SDValue();
}
SDValue DAGCombiner::visitFP_TO_SINT(SDNode *N) {
SDValue N0 = N->getOperand(0);
ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0);
MVT VT = N->getValueType(0);
if (N0CFP)
return DAG.getNode(ISD::FP_TO_SINT, N->getDebugLoc(), VT, N0);
return SDValue();
}
SDValue DAGCombiner::visitFP_TO_UINT(SDNode *N) {
SDValue N0 = N->getOperand(0);
ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0);
MVT VT = N->getValueType(0);
if (N0CFP && VT != MVT::ppcf128)
return DAG.getNode(ISD::FP_TO_UINT, N->getDebugLoc(), VT, N0);
return SDValue();
}
SDValue DAGCombiner::visitFP_ROUND(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0);
MVT VT = N->getValueType(0);
if (N0CFP && N0.getValueType() != MVT::ppcf128)
return DAG.getNode(ISD::FP_ROUND, N->getDebugLoc(), VT, N0, N1);
if (N0.getOpcode() == ISD::FP_EXTEND && VT == N0.getOperand(0).getValueType())
return N0.getOperand(0);
if (N0.getOpcode() == ISD::FP_ROUND) {
bool IsTrunc = N->getConstantOperandVal(1) == 1 &&
N0.getNode()->getConstantOperandVal(1) == 1;
return DAG.getNode(ISD::FP_ROUND, N->getDebugLoc(), VT, N0.getOperand(0),
DAG.getIntPtrConstant(IsTrunc));
}
if (N0.getOpcode() == ISD::FCOPYSIGN && N0.getNode()->hasOneUse()) {
SDValue Tmp = DAG.getNode(ISD::FP_ROUND, N0.getDebugLoc(), VT,
N0.getOperand(0), N1);
AddToWorkList(Tmp.getNode());
return DAG.getNode(ISD::FCOPYSIGN, N->getDebugLoc(), VT,
Tmp, N0.getOperand(1));
}
return SDValue();
}
SDValue DAGCombiner::visitFP_ROUND_INREG(SDNode *N) {
SDValue N0 = N->getOperand(0);
MVT VT = N->getValueType(0);
MVT EVT = cast<VTSDNode>(N->getOperand(1))->getVT();
ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0);
if (N0CFP && (TLI.isTypeLegal(EVT) || !LegalTypes)) {
SDValue Round = DAG.getConstantFP(*N0CFP->getConstantFPValue(), EVT);
return DAG.getNode(ISD::FP_EXTEND, N->getDebugLoc(), VT, Round);
}
return SDValue();
}
SDValue DAGCombiner::visitFP_EXTEND(SDNode *N) {
SDValue N0 = N->getOperand(0);
ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0);
MVT VT = N->getValueType(0);
if (N->hasOneUse() &&
N->use_begin()->getOpcode() == ISD::FP_ROUND)
return SDValue();
if (N0CFP && VT != MVT::ppcf128)
return DAG.getNode(ISD::FP_EXTEND, N->getDebugLoc(), VT, N0);
if (N0.getOpcode() == ISD::FP_ROUND
&& N0.getNode()->getConstantOperandVal(1) == 1) {
SDValue In = N0.getOperand(0);
if (In.getValueType() == VT) return In;
if (VT.bitsLT(In.getValueType()))
return DAG.getNode(ISD::FP_ROUND, N->getDebugLoc(), VT,
In, N0.getOperand(1));
return DAG.getNode(ISD::FP_EXTEND, N->getDebugLoc(), VT, In);
}
if (ISD::isNON_EXTLoad(N0.getNode()) && N0.hasOneUse() &&
((!LegalOperations && !cast<LoadSDNode>(N0)->isVolatile()) ||
TLI.isLoadExtLegal(ISD::EXTLOAD, N0.getValueType()))) {
LoadSDNode *LN0 = cast<LoadSDNode>(N0);
SDValue ExtLoad = DAG.getExtLoad(ISD::EXTLOAD, N->getDebugLoc(), VT,
LN0->getChain(),
LN0->getBasePtr(), LN0->getSrcValue(),
LN0->getSrcValueOffset(),
N0.getValueType(),
LN0->isVolatile(), LN0->getAlignment());
CombineTo(N, ExtLoad);
CombineTo(N0.getNode(),
DAG.getNode(ISD::FP_ROUND, N0.getDebugLoc(),
N0.getValueType(), ExtLoad, DAG.getIntPtrConstant(1)),
ExtLoad.getValue(1));
return SDValue(N, 0); }
return SDValue();
}
SDValue DAGCombiner::visitFNEG(SDNode *N) {
SDValue N0 = N->getOperand(0);
if (isNegatibleForFree(N0, LegalOperations))
return GetNegatedExpression(N0, DAG, LegalOperations);
if (N0.getOpcode() == ISD::BIT_CONVERT && N0.getNode()->hasOneUse() &&
N0.getOperand(0).getValueType().isInteger() &&
!N0.getOperand(0).getValueType().isVector()) {
SDValue Int = N0.getOperand(0);
MVT IntVT = Int.getValueType();
if (IntVT.isInteger() && !IntVT.isVector()) {
Int = DAG.getNode(ISD::XOR, N0.getDebugLoc(), IntVT, Int,
DAG.getConstant(APInt::getSignBit(IntVT.getSizeInBits()), IntVT));
AddToWorkList(Int.getNode());
return DAG.getNode(ISD::BIT_CONVERT, N->getDebugLoc(),
N->getValueType(0), Int);
}
}
return SDValue();
}
SDValue DAGCombiner::visitFABS(SDNode *N) {
SDValue N0 = N->getOperand(0);
ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0);
MVT VT = N->getValueType(0);
if (N0CFP && VT != MVT::ppcf128)
return DAG.getNode(ISD::FABS, N->getDebugLoc(), VT, N0);
if (N0.getOpcode() == ISD::FABS)
return N->getOperand(0);
if (N0.getOpcode() == ISD::FNEG || N0.getOpcode() == ISD::FCOPYSIGN)
return DAG.getNode(ISD::FABS, N->getDebugLoc(), VT, N0.getOperand(0));
if (N0.getOpcode() == ISD::BIT_CONVERT && N0.getNode()->hasOneUse() &&
N0.getOperand(0).getValueType().isInteger() &&
!N0.getOperand(0).getValueType().isVector()) {
SDValue Int = N0.getOperand(0);
MVT IntVT = Int.getValueType();
if (IntVT.isInteger() && !IntVT.isVector()) {
Int = DAG.getNode(ISD::AND, N0.getDebugLoc(), IntVT, Int,
DAG.getConstant(~APInt::getSignBit(IntVT.getSizeInBits()), IntVT));
AddToWorkList(Int.getNode());
return DAG.getNode(ISD::BIT_CONVERT, N->getDebugLoc(),
N->getValueType(0), Int);
}
}
return SDValue();
}
SDValue DAGCombiner::visitBRCOND(SDNode *N) {
SDValue Chain = N->getOperand(0);
SDValue N1 = N->getOperand(1);
SDValue N2 = N->getOperand(2);
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
if (N1C && N1C->isNullValue())
return Chain;
if (N1C && N1C->getAPIntValue() == 1)
return DAG.getNode(ISD::BR, N->getDebugLoc(), MVT::Other, Chain, N2);
if (N1.getOpcode() == ISD::SETCC &&
TLI.isOperationLegalOrCustom(ISD::BR_CC, MVT::Other)) {
return DAG.getNode(ISD::BR_CC, N->getDebugLoc(), MVT::Other,
Chain, N1.getOperand(2),
N1.getOperand(0), N1.getOperand(1), N2);
}
if (N1.hasOneUse() && N1.getOpcode() == ISD::SRL) {
SDValue Op0 = N1.getOperand(0);
SDValue Op1 = N1.getOperand(1);
if (Op0.getOpcode() == ISD::AND &&
Op0.hasOneUse() &&
Op1.getOpcode() == ISD::Constant) {
SDValue AndOp0 = Op0.getOperand(0);
SDValue AndOp1 = Op0.getOperand(1);
if (AndOp1.getOpcode() == ISD::Constant) {
const APInt &AndConst = cast<ConstantSDNode>(AndOp1)->getAPIntValue();
if (AndConst.isPowerOf2() &&
cast<ConstantSDNode>(Op1)->getAPIntValue()==AndConst.logBase2()) {
SDValue SetCC =
DAG.getSetCC(N->getDebugLoc(),
TLI.getSetCCResultType(Op0.getValueType()),
Op0, DAG.getConstant(0, Op0.getValueType()),
ISD::SETNE);
DAG.ReplaceAllUsesOfValueWith(N1, SetCC);
removeFromWorkList(N1.getNode());
DAG.DeleteNode(N1.getNode());
return DAG.getNode(ISD::BRCOND, N->getDebugLoc(),
MVT::Other, Chain, SetCC, N2);
}
}
}
}
return SDValue();
}
SDValue DAGCombiner::visitBR_CC(SDNode *N) {
CondCodeSDNode *CC = cast<CondCodeSDNode>(N->getOperand(1));
SDValue CondLHS = N->getOperand(2), CondRHS = N->getOperand(3);
SDValue Simp = SimplifySetCC(TLI.getSetCCResultType(CondLHS.getValueType()),
CondLHS, CondRHS, CC->get(), N->getDebugLoc(),
false);
if (Simp.getNode()) AddToWorkList(Simp.getNode());
ConstantSDNode *SCCC = dyn_cast_or_null<ConstantSDNode>(Simp.getNode());
if (SCCC && !SCCC->isNullValue())
return DAG.getNode(ISD::BR, N->getDebugLoc(), MVT::Other,
N->getOperand(0), N->getOperand(4));
if (SCCC && SCCC->isNullValue())
return N->getOperand(0);
if (Simp.getNode() && Simp.getOpcode() == ISD::SETCC)
return DAG.getNode(ISD::BR_CC, N->getDebugLoc(), MVT::Other,
N->getOperand(0), Simp.getOperand(2),
Simp.getOperand(0), Simp.getOperand(1),
N->getOperand(4));
return SDValue();
}
bool DAGCombiner::CombineToPreIndexedLoadStore(SDNode *N) {
if (!LegalOperations)
return false;
bool isLoad = true;
SDValue Ptr;
MVT VT;
if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
if (LD->isIndexed())
return false;
VT = LD->getMemoryVT();
if (!TLI.isIndexedLoadLegal(ISD::PRE_INC, VT) &&
!TLI.isIndexedLoadLegal(ISD::PRE_DEC, VT))
return false;
Ptr = LD->getBasePtr();
} else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
if (ST->isIndexed())
return false;
VT = ST->getMemoryVT();
if (!TLI.isIndexedStoreLegal(ISD::PRE_INC, VT) &&
!TLI.isIndexedStoreLegal(ISD::PRE_DEC, VT))
return false;
Ptr = ST->getBasePtr();
isLoad = false;
} else {
return false;
}
if ((Ptr.getOpcode() != ISD::ADD && Ptr.getOpcode() != ISD::SUB) ||
Ptr.getNode()->hasOneUse())
return false;
SDValue BasePtr;
SDValue Offset;
ISD::MemIndexedMode AM = ISD::UNINDEXED;
if (!TLI.getPreIndexedAddressParts(N, BasePtr, Offset, AM, DAG))
return false;
if (isa<ConstantSDNode>(Offset) &&
cast<ConstantSDNode>(Offset)->isNullValue())
return false;
if (isa<FrameIndexSDNode>(BasePtr))
return false;
if (!isLoad) {
SDValue Val = cast<StoreSDNode>(N)->getValue();
if (Val == BasePtr || BasePtr.getNode()->isPredecessorOf(Val.getNode()))
return false;
}
bool RealUse = false;
for (SDNode::use_iterator I = Ptr.getNode()->use_begin(),
E = Ptr.getNode()->use_end(); I != E; ++I) {
SDNode *Use = *I;
if (Use == N)
continue;
if (Use->isPredecessorOf(N))
return false;
if (!((Use->getOpcode() == ISD::LOAD &&
cast<LoadSDNode>(Use)->getBasePtr() == Ptr) ||
(Use->getOpcode() == ISD::STORE &&
cast<StoreSDNode>(Use)->getBasePtr() == Ptr)))
RealUse = true;
}
if (!RealUse)
return false;
SDValue Result;
if (isLoad)
Result = DAG.getIndexedLoad(SDValue(N,0), N->getDebugLoc(),
BasePtr, Offset, AM);
else
Result = DAG.getIndexedStore(SDValue(N,0), N->getDebugLoc(),
BasePtr, Offset, AM);
++PreIndexedNodes;
++NodesCombined;
DOUT << "\nReplacing.4 "; DEBUG(N->dump(&DAG));
DOUT << "\nWith: "; DEBUG(Result.getNode()->dump(&DAG));
DOUT << '\n';
WorkListRemover DeadNodes(*this);
if (isLoad) {
DAG.ReplaceAllUsesOfValueWith(SDValue(N, 0), Result.getValue(0),
&DeadNodes);
DAG.ReplaceAllUsesOfValueWith(SDValue(N, 1), Result.getValue(2),
&DeadNodes);
} else {
DAG.ReplaceAllUsesOfValueWith(SDValue(N, 0), Result.getValue(1),
&DeadNodes);
}
DAG.DeleteNode(N);
DAG.ReplaceAllUsesOfValueWith(Ptr, Result.getValue(isLoad ? 1 : 0),
&DeadNodes);
removeFromWorkList(Ptr.getNode());
DAG.DeleteNode(Ptr.getNode());
return true;
}
bool DAGCombiner::CombineToPostIndexedLoadStore(SDNode *N) {
if (!LegalOperations)
return false;
bool isLoad = true;
SDValue Ptr;
MVT VT;
if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
if (LD->isIndexed())
return false;
VT = LD->getMemoryVT();
if (!TLI.isIndexedLoadLegal(ISD::POST_INC, VT) &&
!TLI.isIndexedLoadLegal(ISD::POST_DEC, VT))
return false;
Ptr = LD->getBasePtr();
} else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
if (ST->isIndexed())
return false;
VT = ST->getMemoryVT();
if (!TLI.isIndexedStoreLegal(ISD::POST_INC, VT) &&
!TLI.isIndexedStoreLegal(ISD::POST_DEC, VT))
return false;
Ptr = ST->getBasePtr();
isLoad = false;
} else {
return false;
}
if (Ptr.getNode()->hasOneUse())
return false;
for (SDNode::use_iterator I = Ptr.getNode()->use_begin(),
E = Ptr.getNode()->use_end(); I != E; ++I) {
SDNode *Op = *I;
if (Op == N ||
(Op->getOpcode() != ISD::ADD && Op->getOpcode() != ISD::SUB))
continue;
SDValue BasePtr;
SDValue Offset;
ISD::MemIndexedMode AM = ISD::UNINDEXED;
if (TLI.getPostIndexedAddressParts(N, Op, BasePtr, Offset, AM, DAG)) {
if (Ptr == Offset)
std::swap(BasePtr, Offset);
if (Ptr != BasePtr)
continue;
if (isa<ConstantSDNode>(Offset) &&
cast<ConstantSDNode>(Offset)->isNullValue())
continue;
bool TryNext = false;
for (SDNode::use_iterator II = BasePtr.getNode()->use_begin(),
EE = BasePtr.getNode()->use_end(); II != EE; ++II) {
SDNode *Use = *II;
if (Use == Ptr.getNode())
continue;
if (Use->getOpcode() == ISD::ADD || Use->getOpcode() == ISD::SUB){
bool RealUse = false;
for (SDNode::use_iterator III = Use->use_begin(),
EEE = Use->use_end(); III != EEE; ++III) {
SDNode *UseUse = *III;
if (!((UseUse->getOpcode() == ISD::LOAD &&
cast<LoadSDNode>(UseUse)->getBasePtr().getNode() == Use) ||
(UseUse->getOpcode() == ISD::STORE &&
cast<StoreSDNode>(UseUse)->getBasePtr().getNode() == Use)))
RealUse = true;
}
if (!RealUse) {
TryNext = true;
break;
}
}
}
if (TryNext)
continue;
if (!Op->isPredecessorOf(N) && !N->isPredecessorOf(Op)) {
SDValue Result = isLoad
? DAG.getIndexedLoad(SDValue(N,0), N->getDebugLoc(),
BasePtr, Offset, AM)
: DAG.getIndexedStore(SDValue(N,0), N->getDebugLoc(),
BasePtr, Offset, AM);
++PostIndexedNodes;
++NodesCombined;
DOUT << "\nReplacing.5 "; DEBUG(N->dump(&DAG));
DOUT << "\nWith: "; DEBUG(Result.getNode()->dump(&DAG));
DOUT << '\n';
WorkListRemover DeadNodes(*this);
if (isLoad) {
DAG.ReplaceAllUsesOfValueWith(SDValue(N, 0), Result.getValue(0),
&DeadNodes);
DAG.ReplaceAllUsesOfValueWith(SDValue(N, 1), Result.getValue(2),
&DeadNodes);
} else {
DAG.ReplaceAllUsesOfValueWith(SDValue(N, 0), Result.getValue(1),
&DeadNodes);
}
DAG.DeleteNode(N);
DAG.ReplaceAllUsesOfValueWith(SDValue(Op, 0),
Result.getValue(isLoad ? 1 : 0),
&DeadNodes);
removeFromWorkList(Op);
DAG.DeleteNode(Op);
return true;
}
}
}
return false;
}
static unsigned InferAlignment(SDValue Ptr, SelectionDAG &DAG) {
int FrameIdx = 1 << 31;
int64_t FrameOffset = 0;
if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Ptr)) {
FrameIdx = FI->getIndex();
} else if (Ptr.getOpcode() == ISD::ADD &&
isa<ConstantSDNode>(Ptr.getOperand(1)) &&
isa<FrameIndexSDNode>(Ptr.getOperand(0))) {
FrameIdx = cast<FrameIndexSDNode>(Ptr.getOperand(0))->getIndex();
FrameOffset = Ptr.getConstantOperandVal(1);
}
if (FrameIdx != (1 << 31)) {
const MachineFrameInfo &MFI = *DAG.getMachineFunction().getFrameInfo();
if (MFI.isFixedObjectIndex(FrameIdx)) {
int64_t ObjectOffset = MFI.getObjectOffset(FrameIdx) + FrameOffset;
unsigned StackAlign = DAG.getTarget().getFrameInfo()->getStackAlignment();
unsigned Align = MinAlign(ObjectOffset, StackAlign);
unsigned FIInfoAlign = MinAlign(MFI.getObjectAlignment(FrameIdx),
FrameOffset);
return std::max(Align, FIInfoAlign);
}
}
return 0;
}
SDValue DAGCombiner::visitLOAD(SDNode *N) {
LoadSDNode *LD = cast<LoadSDNode>(N);
SDValue Chain = LD->getChain();
SDValue Ptr = LD->getBasePtr();
if (OptLevel != CodeGenOpt::None && LD->isUnindexed()) {
if (unsigned Align = InferAlignment(Ptr, DAG)) {
if (Align > LD->getAlignment())
return DAG.getExtLoad(LD->getExtensionType(), N->getDebugLoc(),
LD->getValueType(0),
Chain, Ptr, LD->getSrcValue(),
LD->getSrcValueOffset(), LD->getMemoryVT(),
LD->isVolatile(), Align);
}
}
if (!LD->isVolatile()) {
if (N->getValueType(1) == MVT::Other) {
if (N->hasNUsesOfValue(0, 0)) {
DOUT << "\nReplacing.6 "; DEBUG(N->dump(&DAG));
DOUT << "\nWith chain: "; DEBUG(Chain.getNode()->dump(&DAG));
DOUT << "\n";
WorkListRemover DeadNodes(*this);
DAG.ReplaceAllUsesOfValueWith(SDValue(N, 1), Chain, &DeadNodes);
if (N->use_empty()) {
removeFromWorkList(N);
DAG.DeleteNode(N);
}
return SDValue(N, 0); }
} else {
assert(N->getValueType(2) == MVT::Other && "Malformed indexed loads?");
if (N->hasNUsesOfValue(0, 0) && N->hasNUsesOfValue(0, 1)) {
SDValue Undef = DAG.getUNDEF(N->getValueType(0));
DOUT << "\nReplacing.6 "; DEBUG(N->dump(&DAG));
DOUT << "\nWith: "; DEBUG(Undef.getNode()->dump(&DAG));
DOUT << " and 2 other values\n";
WorkListRemover DeadNodes(*this);
DAG.ReplaceAllUsesOfValueWith(SDValue(N, 0), Undef, &DeadNodes);
DAG.ReplaceAllUsesOfValueWith(SDValue(N, 1),
DAG.getUNDEF(N->getValueType(1)),
&DeadNodes);
DAG.ReplaceAllUsesOfValueWith(SDValue(N, 2), Chain, &DeadNodes);
removeFromWorkList(N);
DAG.DeleteNode(N);
return SDValue(N, 0); }
}
}
if (LD->getExtensionType() == ISD::NON_EXTLOAD &&
!LD->isVolatile()) {
if (ISD::isNON_TRUNCStore(Chain.getNode())) {
StoreSDNode *PrevST = cast<StoreSDNode>(Chain);
if (PrevST->getBasePtr() == Ptr &&
PrevST->getValue().getValueType() == N->getValueType(0))
return CombineTo(N, Chain.getOperand(1), Chain);
}
}
if (CombinerAA) {
SDValue BetterChain = FindBetterChain(N, Chain);
if (Chain != BetterChain) {
SDValue ReplLoad;
if (LD->getExtensionType() == ISD::NON_EXTLOAD) {
ReplLoad = DAG.getLoad(N->getValueType(0), LD->getDebugLoc(),
BetterChain, Ptr,
LD->getSrcValue(), LD->getSrcValueOffset(),
LD->isVolatile(), LD->getAlignment());
} else {
ReplLoad = DAG.getExtLoad(LD->getExtensionType(), LD->getDebugLoc(),
LD->getValueType(0),
BetterChain, Ptr, LD->getSrcValue(),
LD->getSrcValueOffset(),
LD->getMemoryVT(),
LD->isVolatile(),
LD->getAlignment());
}
SDValue Token = DAG.getNode(ISD::TokenFactor, N->getDebugLoc(),
MVT::Other, Chain, ReplLoad.getValue(1));
return CombineTo(N, ReplLoad.getValue(0), Token, false);
}
}
if (CombineToPreIndexedLoadStore(N) || CombineToPostIndexedLoadStore(N))
return SDValue(N, 0);
return SDValue();
}
SDValue DAGCombiner::visitSTORE(SDNode *N) {
StoreSDNode *ST = cast<StoreSDNode>(N);
SDValue Chain = ST->getChain();
SDValue Value = ST->getValue();
SDValue Ptr = ST->getBasePtr();
if (OptLevel != CodeGenOpt::None && ST->isUnindexed()) {
if (unsigned Align = InferAlignment(Ptr, DAG)) {
if (Align > ST->getAlignment())
return DAG.getTruncStore(Chain, N->getDebugLoc(), Value,
Ptr, ST->getSrcValue(),
ST->getSrcValueOffset(), ST->getMemoryVT(),
ST->isVolatile(), Align);
}
}
if (Value.getOpcode() == ISD::BIT_CONVERT && !ST->isTruncatingStore() &&
ST->isUnindexed()) {
unsigned OrigAlign = ST->getAlignment();
MVT SVT = Value.getOperand(0).getValueType();
unsigned Align = TLI.getTargetData()->
getABITypeAlignment(SVT.getTypeForMVT());
if (Align <= OrigAlign &&
((!LegalOperations && !ST->isVolatile()) ||
TLI.isOperationLegalOrCustom(ISD::STORE, SVT)))
return DAG.getStore(Chain, N->getDebugLoc(), Value.getOperand(0),
Ptr, ST->getSrcValue(),
ST->getSrcValueOffset(), ST->isVolatile(), OrigAlign);
}
if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Value)) {
if (Value.getOpcode() != ISD::TargetConstantFP) {
SDValue Tmp;
switch (CFP->getValueType(0).getSimpleVT()) {
default: assert(0 && "Unknown FP type");
case MVT::f80: case MVT::f128:
case MVT::ppcf128:
break;
case MVT::f32:
if (((TLI.isTypeLegal(MVT::i32) || !LegalTypes) && !LegalOperations &&
!ST->isVolatile()) ||
TLI.isOperationLegalOrCustom(ISD::STORE, MVT::i32)) {
Tmp = DAG.getConstant((uint32_t)CFP->getValueAPF().
bitcastToAPInt().getZExtValue(), MVT::i32);
return DAG.getStore(Chain, N->getDebugLoc(), Tmp,
Ptr, ST->getSrcValue(),
ST->getSrcValueOffset(), ST->isVolatile(),
ST->getAlignment());
}
break;
case MVT::f64:
if (((TLI.isTypeLegal(MVT::i64) || !LegalTypes) && !LegalOperations &&
!ST->isVolatile()) ||
TLI.isOperationLegalOrCustom(ISD::STORE, MVT::i64)) {
Tmp = DAG.getConstant(CFP->getValueAPF().bitcastToAPInt().
getZExtValue(), MVT::i64);
return DAG.getStore(Chain, N->getDebugLoc(), Tmp,
Ptr, ST->getSrcValue(),
ST->getSrcValueOffset(), ST->isVolatile(),
ST->getAlignment());
} else if (!ST->isVolatile() &&
TLI.isOperationLegalOrCustom(ISD::STORE, MVT::i32)) {
uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
SDValue Lo = DAG.getConstant(Val & 0xFFFFFFFF, MVT::i32);
SDValue Hi = DAG.getConstant(Val >> 32, MVT::i32);
if (TLI.isBigEndian()) std::swap(Lo, Hi);
int SVOffset = ST->getSrcValueOffset();
unsigned Alignment = ST->getAlignment();
bool isVolatile = ST->isVolatile();
SDValue St0 = DAG.getStore(Chain, ST->getDebugLoc(), Lo,
Ptr, ST->getSrcValue(),
ST->getSrcValueOffset(),
isVolatile, ST->getAlignment());
Ptr = DAG.getNode(ISD::ADD, N->getDebugLoc(), Ptr.getValueType(), Ptr,
DAG.getConstant(4, Ptr.getValueType()));
SVOffset += 4;
Alignment = MinAlign(Alignment, 4U);
SDValue St1 = DAG.getStore(Chain, ST->getDebugLoc(), Hi,
Ptr, ST->getSrcValue(),
SVOffset, isVolatile, Alignment);
return DAG.getNode(ISD::TokenFactor, N->getDebugLoc(), MVT::Other,
St0, St1);
}
break;
}
}
}
if (CombinerAA) {
SDValue BetterChain = FindBetterChain(N, Chain);
if (Chain != BetterChain) {
SDValue ReplStore;
if (ST->isTruncatingStore()) {
ReplStore = DAG.getTruncStore(BetterChain, N->getDebugLoc(), Value, Ptr,
ST->getSrcValue(),ST->getSrcValueOffset(),
ST->getMemoryVT(),
ST->isVolatile(), ST->getAlignment());
} else {
ReplStore = DAG.getStore(BetterChain, N->getDebugLoc(), Value, Ptr,
ST->getSrcValue(), ST->getSrcValueOffset(),
ST->isVolatile(), ST->getAlignment());
}
SDValue Token = DAG.getNode(ISD::TokenFactor, N->getDebugLoc(),
MVT::Other, Chain, ReplStore);
return CombineTo(N, Token, false);
}
}
if (CombineToPreIndexedLoadStore(N) || CombineToPostIndexedLoadStore(N))
return SDValue(N, 0);
if (ST->isTruncatingStore() && ST->isUnindexed() &&
Value.getValueType().isInteger()) {
SDValue Shorter =
GetDemandedBits(Value,
APInt::getLowBitsSet(Value.getValueSizeInBits(),
ST->getMemoryVT().getSizeInBits()));
AddToWorkList(Value.getNode());
if (Shorter.getNode())
return DAG.getTruncStore(Chain, N->getDebugLoc(), Shorter,
Ptr, ST->getSrcValue(),
ST->getSrcValueOffset(), ST->getMemoryVT(),
ST->isVolatile(), ST->getAlignment());
if (SimplifyDemandedBits(Value,
APInt::getLowBitsSet(
Value.getValueSizeInBits(),
ST->getMemoryVT().getSizeInBits())))
return SDValue(N, 0);
}
if (LoadSDNode *Ld = dyn_cast<LoadSDNode>(Value)) {
if (Ld->getBasePtr() == Ptr && ST->getMemoryVT() == Ld->getMemoryVT() &&
ST->isUnindexed() && !ST->isVolatile() &&
Chain.reachesChainWithoutSideEffects(SDValue(Ld, 1))) {
return Chain;
}
}
if ((Value.getOpcode() == ISD::FP_ROUND || Value.getOpcode() == ISD::TRUNCATE)
&& Value.getNode()->hasOneUse() && ST->isUnindexed() &&
TLI.isTruncStoreLegal(Value.getOperand(0).getValueType(),
ST->getMemoryVT())) {
return DAG.getTruncStore(Chain, N->getDebugLoc(), Value.getOperand(0),
Ptr, ST->getSrcValue(),
ST->getSrcValueOffset(), ST->getMemoryVT(),
ST->isVolatile(), ST->getAlignment());
}
return SDValue();
}
SDValue DAGCombiner::visitINSERT_VECTOR_ELT(SDNode *N) {
SDValue InVec = N->getOperand(0);
SDValue InVal = N->getOperand(1);
SDValue EltNo = N->getOperand(2);
if (InVec.getOpcode() == ISD::BUILD_VECTOR && isa<ConstantSDNode>(EltNo)) {
unsigned Elt = cast<ConstantSDNode>(EltNo)->getZExtValue();
SmallVector<SDValue, 8> Ops(InVec.getNode()->op_begin(),
InVec.getNode()->op_end());
if (Elt < Ops.size())
Ops[Elt] = InVal;
return DAG.getNode(ISD::BUILD_VECTOR, N->getDebugLoc(),
InVec.getValueType(), &Ops[0], Ops.size());
}
if (!LegalOperations && InVec.getOpcode() == ISD::UNDEF &&
isa<ConstantSDNode>(EltNo)) {
MVT VT = InVec.getValueType();
MVT EVT = VT.getVectorElementType();
unsigned NElts = VT.getVectorNumElements();
SmallVector<SDValue, 8> Ops(NElts, DAG.getUNDEF(EVT));
unsigned Elt = cast<ConstantSDNode>(EltNo)->getZExtValue();
if (Elt < Ops.size())
Ops[Elt] = InVal;
return DAG.getNode(ISD::BUILD_VECTOR, N->getDebugLoc(),
InVec.getValueType(), &Ops[0], Ops.size());
}
return SDValue();
}
SDValue DAGCombiner::visitEXTRACT_VECTOR_ELT(SDNode *N) {
SDValue InVec = N->getOperand(0);
if (InVec.getOpcode() == ISD::SCALAR_TO_VECTOR) {
MVT EltVT = InVec.getValueType().getVectorElementType();
SDValue InOp = InVec.getOperand(0);
if (InOp.getValueType() != EltVT)
return DAG.getNode(ISD::TRUNCATE, InVec.getDebugLoc(), EltVT, InOp);
return InOp;
}
if (!LegalOperations) return SDValue();
SDValue EltNo = N->getOperand(1);
if (isa<ConstantSDNode>(EltNo)) {
unsigned Elt = cast<ConstantSDNode>(EltNo)->getZExtValue();
bool NewLoad = false;
bool BCNumEltsChanged = false;
MVT VT = InVec.getValueType();
MVT EVT = VT.getVectorElementType();
MVT LVT = EVT;
if (InVec.getOpcode() == ISD::BIT_CONVERT) {
MVT BCVT = InVec.getOperand(0).getValueType();
if (!BCVT.isVector() || EVT.bitsGT(BCVT.getVectorElementType()))
return SDValue();
if (VT.getVectorNumElements() != BCVT.getVectorNumElements())
BCNumEltsChanged = true;
InVec = InVec.getOperand(0);
EVT = BCVT.getVectorElementType();
NewLoad = true;
}
LoadSDNode *LN0 = NULL;
if (ISD::isNormalLoad(InVec.getNode())) {
LN0 = cast<LoadSDNode>(InVec);
} else if (InVec.getOpcode() == ISD::SCALAR_TO_VECTOR &&
InVec.getOperand(0).getValueType() == EVT &&
ISD::isNormalLoad(InVec.getOperand(0).getNode())) {
LN0 = cast<LoadSDNode>(InVec.getOperand(0));
} else if (InVec.getOpcode() == ISD::VECTOR_SHUFFLE) {
if (BCNumEltsChanged)
return SDValue();
int Idx = cast<ShuffleVectorSDNode>(InVec)->getMaskElt(Elt);
int NumElems = InVec.getValueType().getVectorNumElements();
InVec = (Idx < NumElems) ? InVec.getOperand(0) : InVec.getOperand(1);
if (InVec.getOpcode() == ISD::BIT_CONVERT)
InVec = InVec.getOperand(0);
if (ISD::isNormalLoad(InVec.getNode())) {
LN0 = cast<LoadSDNode>(InVec);
Elt = (Idx < NumElems) ? Idx : Idx - NumElems;
}
}
if (!LN0 || !LN0->hasOneUse() || LN0->isVolatile())
return SDValue();
unsigned Align = LN0->getAlignment();
if (NewLoad) {
unsigned NewAlign =
TLI.getTargetData()->getABITypeAlignment(LVT.getTypeForMVT());
if (NewAlign > Align || !TLI.isOperationLegalOrCustom(ISD::LOAD, LVT))
return SDValue();
Align = NewAlign;
}
SDValue NewPtr = LN0->getBasePtr();
if (Elt) {
unsigned PtrOff = LVT.getSizeInBits() * Elt / 8;
MVT PtrType = NewPtr.getValueType();
if (TLI.isBigEndian())
PtrOff = VT.getSizeInBits() / 8 - PtrOff;
NewPtr = DAG.getNode(ISD::ADD, N->getDebugLoc(), PtrType, NewPtr,
DAG.getConstant(PtrOff, PtrType));
}
return DAG.getLoad(LVT, N->getDebugLoc(), LN0->getChain(), NewPtr,
LN0->getSrcValue(), LN0->getSrcValueOffset(),
LN0->isVolatile(), Align);
}
return SDValue();
}
SDValue DAGCombiner::visitBUILD_VECTOR(SDNode *N) {
unsigned NumInScalars = N->getNumOperands();
MVT VT = N->getValueType(0);
MVT EltType = VT.getVectorElementType();
SDValue VecIn1, VecIn2;
for (unsigned i = 0; i != NumInScalars; ++i) {
if (N->getOperand(i).getOpcode() == ISD::UNDEF) continue;
if (N->getOperand(i).getOpcode() != ISD::EXTRACT_VECTOR_ELT ||
!isa<ConstantSDNode>(N->getOperand(i).getOperand(1))) {
VecIn1 = VecIn2 = SDValue(0, 0);
break;
}
SDValue ExtractedFromVec = N->getOperand(i).getOperand(0);
if (ExtractedFromVec.getValueType() != VT) {
VecIn1 = VecIn2 = SDValue(0, 0);
break;
}
if (ExtractedFromVec == VecIn1 || ExtractedFromVec == VecIn2)
continue;
if (VecIn1.getNode() == 0) {
VecIn1 = ExtractedFromVec;
} else if (VecIn2.getNode() == 0) {
VecIn2 = ExtractedFromVec;
} else {
VecIn1 = VecIn2 = SDValue(0, 0);
break;
}
}
if (VecIn1.getNode()) {
SmallVector<int, 8> Mask;
for (unsigned i = 0; i != NumInScalars; ++i) {
if (N->getOperand(i).getOpcode() == ISD::UNDEF) {
Mask.push_back(-1);
continue;
}
SDValue Extract = N->getOperand(i);
SDValue ExtVal = Extract.getOperand(1);
if (Extract.getOperand(0) == VecIn1) {
Mask.push_back(cast<ConstantSDNode>(ExtVal)->getZExtValue());
continue;
}
unsigned Idx = cast<ConstantSDNode>(ExtVal)->getZExtValue();
Mask.push_back(Idx+NumInScalars);
}
if (!TLI.isTypeLegal(VT) && LegalTypes)
return SDValue();
SDValue Ops[2];
Ops[0] = VecIn1;
Ops[1] = VecIn2.getNode() ? VecIn2 : DAG.getUNDEF(VT);
return DAG.getVectorShuffle(VT, N->getDebugLoc(), Ops[0], Ops[1], &Mask[0]);
}
return SDValue();
}
SDValue DAGCombiner::visitCONCAT_VECTORS(SDNode *N) {
if (N->getNumOperands() == 1)
return N->getOperand(0);
return SDValue();
}
SDValue DAGCombiner::visitVECTOR_SHUFFLE(SDNode *N) {
return SDValue();
MVT VT = N->getValueType(0);
unsigned NumElts = VT.getVectorNumElements();
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
assert(N0.getValueType().getVectorNumElements() == NumElts &&
"Vector shuffle must be normalized in DAG");
if (cast<ShuffleVectorSDNode>(N)->isSplat()) {
SDNode *V = N0.getNode();
if (V->getOpcode() == ISD::BIT_CONVERT) {
SDValue ConvInput = V->getOperand(0);
if (ConvInput.getValueType().isVector() &&
ConvInput.getValueType().getVectorNumElements() == NumElts)
V = ConvInput.getNode();
}
if (V->getOpcode() == ISD::BUILD_VECTOR) {
unsigned NumElems = V->getNumOperands();
unsigned BaseIdx = cast<ShuffleVectorSDNode>(N)->getSplatIndex();
if (NumElems > BaseIdx) {
SDValue Base;
bool AllSame = true;
for (unsigned i = 0; i != NumElems; ++i) {
if (V->getOperand(i).getOpcode() != ISD::UNDEF) {
Base = V->getOperand(i);
break;
}
}
if (!Base.getNode())
return N0;
for (unsigned i = 0; i != NumElems; ++i) {
if (V->getOperand(i) != Base) {
AllSame = false;
break;
}
}
if (AllSame)
return N0;
}
}
}
return SDValue();
}
SDValue DAGCombiner::XformToShuffleWithZero(SDNode *N) {
MVT VT = N->getValueType(0);
DebugLoc dl = N->getDebugLoc();
SDValue LHS = N->getOperand(0);
SDValue RHS = N->getOperand(1);
if (N->getOpcode() == ISD::AND) {
if (RHS.getOpcode() == ISD::BIT_CONVERT)
RHS = RHS.getOperand(0);
if (RHS.getOpcode() == ISD::BUILD_VECTOR) {
SmallVector<int, 8> Indices;
unsigned NumElts = RHS.getNumOperands();
for (unsigned i = 0; i != NumElts; ++i) {
SDValue Elt = RHS.getOperand(i);
if (!isa<ConstantSDNode>(Elt))
return SDValue();
else if (cast<ConstantSDNode>(Elt)->isAllOnesValue())
Indices.push_back(i);
else if (cast<ConstantSDNode>(Elt)->isNullValue())
Indices.push_back(NumElts);
else
return SDValue();
}
MVT RVT = RHS.getValueType();
if (!TLI.isVectorClearMaskLegal(Indices, RVT))
return SDValue();
MVT EVT = RVT.getVectorElementType();
SmallVector<SDValue,8> ZeroOps(RVT.getVectorNumElements(),
DAG.getConstant(0, EVT));
SDValue Zero = DAG.getNode(ISD::BUILD_VECTOR, N->getDebugLoc(),
RVT, &ZeroOps[0], ZeroOps.size());
LHS = DAG.getNode(ISD::BIT_CONVERT, dl, RVT, LHS);
SDValue Shuf = DAG.getVectorShuffle(RVT, dl, LHS, Zero, &Indices[0]);
return DAG.getNode(ISD::BIT_CONVERT, dl, VT, Shuf);
}
}
return SDValue();
}
SDValue DAGCombiner::SimplifyVBinOp(SDNode *N) {
if (LegalOperations) return SDValue();
MVT VT = N->getValueType(0);
assert(VT.isVector() && "SimplifyVBinOp only works on vectors!");
MVT EltType = VT.getVectorElementType();
SDValue LHS = N->getOperand(0);
SDValue RHS = N->getOperand(1);
SDValue Shuffle = XformToShuffleWithZero(N);
if (Shuffle.getNode()) return Shuffle;
if (LHS.getOpcode() == ISD::BUILD_VECTOR &&
RHS.getOpcode() == ISD::BUILD_VECTOR) {
SmallVector<SDValue, 8> Ops;
for (unsigned i = 0, e = LHS.getNumOperands(); i != e; ++i) {
SDValue LHSOp = LHS.getOperand(i);
SDValue RHSOp = RHS.getOperand(i);
if ((LHSOp.getOpcode() != ISD::UNDEF &&
LHSOp.getOpcode() != ISD::Constant &&
LHSOp.getOpcode() != ISD::ConstantFP) ||
(RHSOp.getOpcode() != ISD::UNDEF &&
RHSOp.getOpcode() != ISD::Constant &&
RHSOp.getOpcode() != ISD::ConstantFP))
break;
if (N->getOpcode() == ISD::SDIV || N->getOpcode() == ISD::UDIV ||
N->getOpcode() == ISD::FDIV) {
if ((RHSOp.getOpcode() == ISD::Constant &&
cast<ConstantSDNode>(RHSOp.getNode())->isNullValue()) ||
(RHSOp.getOpcode() == ISD::ConstantFP &&
cast<ConstantFPSDNode>(RHSOp.getNode())->getValueAPF().isZero()))
break;
}
Ops.push_back(DAG.getNode(N->getOpcode(), LHS.getDebugLoc(),
EltType, LHSOp, RHSOp));
AddToWorkList(Ops.back().getNode());
assert((Ops.back().getOpcode() == ISD::UNDEF ||
Ops.back().getOpcode() == ISD::Constant ||
Ops.back().getOpcode() == ISD::ConstantFP) &&
"Scalar binop didn't fold!");
}
if (Ops.size() == LHS.getNumOperands()) {
MVT VT = LHS.getValueType();
return DAG.getNode(ISD::BUILD_VECTOR, N->getDebugLoc(), VT,
&Ops[0], Ops.size());
}
}
return SDValue();
}
SDValue DAGCombiner::SimplifySelect(DebugLoc DL, SDValue N0,
SDValue N1, SDValue N2){
assert(N0.getOpcode() ==ISD::SETCC && "First argument must be a SetCC node!");
SDValue SCC = SimplifySelectCC(DL, N0.getOperand(0), N0.getOperand(1), N1, N2,
cast<CondCodeSDNode>(N0.getOperand(2))->get());
if (SCC.getNode()) {
if (SCC.getOpcode() == ISD::SELECT_CC) {
SDValue SETCC = DAG.getNode(ISD::SETCC, N0.getDebugLoc(),
N0.getValueType(),
SCC.getOperand(0), SCC.getOperand(1),
SCC.getOperand(4));
AddToWorkList(SETCC.getNode());
return DAG.getNode(ISD::SELECT, SCC.getDebugLoc(), SCC.getValueType(),
SCC.getOperand(2), SCC.getOperand(3), SETCC);
}
return SCC;
}
return SDValue();
}
bool DAGCombiner::SimplifySelectOps(SDNode *TheSelect, SDValue LHS,
SDValue RHS) {
if (LHS.getOpcode() == RHS.getOpcode() && LHS.hasOneUse() && RHS.hasOneUse()){
if (LHS.getOpcode() == ISD::LOAD &&
!cast<LoadSDNode>(LHS)->isVolatile() &&
!cast<LoadSDNode>(RHS)->isVolatile() &&
LHS.getOperand(0) == RHS.getOperand(0)) {
LoadSDNode *LLD = cast<LoadSDNode>(LHS);
LoadSDNode *RLD = cast<LoadSDNode>(RHS);
if (LLD->getMemoryVT() == RLD->getMemoryVT()) {
SDValue Addr;
if (TheSelect->getOpcode() == ISD::SELECT) {
if (!LLD->isPredecessorOf(TheSelect->getOperand(0).getNode()) &&
!RLD->isPredecessorOf(TheSelect->getOperand(0).getNode())) {
Addr = DAG.getNode(ISD::SELECT, TheSelect->getDebugLoc(),
LLD->getBasePtr().getValueType(),
TheSelect->getOperand(0), LLD->getBasePtr(),
RLD->getBasePtr());
}
} else {
if (!LLD->isPredecessorOf(TheSelect->getOperand(0).getNode()) &&
!RLD->isPredecessorOf(TheSelect->getOperand(0).getNode()) &&
!LLD->isPredecessorOf(TheSelect->getOperand(1).getNode()) &&
!RLD->isPredecessorOf(TheSelect->getOperand(1).getNode())) {
Addr = DAG.getNode(ISD::SELECT_CC, TheSelect->getDebugLoc(),
LLD->getBasePtr().getValueType(),
TheSelect->getOperand(0),
TheSelect->getOperand(1),
LLD->getBasePtr(), RLD->getBasePtr(),
TheSelect->getOperand(4));
}
}
if (Addr.getNode()) {
SDValue Load;
if (LLD->getExtensionType() == ISD::NON_EXTLOAD) {
Load = DAG.getLoad(TheSelect->getValueType(0),
TheSelect->getDebugLoc(),
LLD->getChain(),
Addr,LLD->getSrcValue(),
LLD->getSrcValueOffset(),
LLD->isVolatile(),
LLD->getAlignment());
} else {
Load = DAG.getExtLoad(LLD->getExtensionType(),
TheSelect->getDebugLoc(),
TheSelect->getValueType(0),
LLD->getChain(), Addr, LLD->getSrcValue(),
LLD->getSrcValueOffset(),
LLD->getMemoryVT(),
LLD->isVolatile(),
LLD->getAlignment());
}
CombineTo(TheSelect, Load);
CombineTo(LHS.getNode(), Load.getValue(0), Load.getValue(1));
CombineTo(RHS.getNode(), Load.getValue(0), Load.getValue(1));
return true;
}
}
}
}
return false;
}
SDValue DAGCombiner::SimplifySelectCC(DebugLoc DL, SDValue N0, SDValue N1,
SDValue N2, SDValue N3,
ISD::CondCode CC, bool NotExtCompare) {
if (N2 == N3) return N2;
MVT VT = N2.getValueType();
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode());
ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.getNode());
ConstantSDNode *N3C = dyn_cast<ConstantSDNode>(N3.getNode());
SDValue SCC = SimplifySetCC(TLI.getSetCCResultType(N0.getValueType()),
N0, N1, CC, DL, false);
if (SCC.getNode()) AddToWorkList(SCC.getNode());
ConstantSDNode *SCCC = dyn_cast_or_null<ConstantSDNode>(SCC.getNode());
if (SCCC && !SCCC->isNullValue())
return N2;
if (SCCC && SCCC->isNullValue())
return N3;
if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N1)) {
if (CFP->getValueAPF().isZero()) {
if ((CC == ISD::SETGE || CC == ISD::SETGT) &&
N0 == N2 && N3.getOpcode() == ISD::FNEG &&
N2 == N3.getOperand(0))
return DAG.getNode(ISD::FABS, DL, VT, N0);
if ((CC == ISD::SETLT || CC == ISD::SETLE) &&
N0 == N3 && N2.getOpcode() == ISD::FNEG &&
N2.getOperand(0) == N3)
return DAG.getNode(ISD::FABS, DL, VT, N3);
}
}
if (ConstantFPSDNode *TV = dyn_cast<ConstantFPSDNode>(N2))
if (ConstantFPSDNode *FV = dyn_cast<ConstantFPSDNode>(N3)) {
if (TLI.isTypeLegal(N2.getValueType()) &&
(TLI.getOperationAction(ISD::ConstantFP, N2.getValueType()) !=
TargetLowering::Legal) &&
(TV->hasOneUse() || FV->hasOneUse())) {
Constant *Elts[] = {
const_cast<ConstantFP*>(FV->getConstantFPValue()),
const_cast<ConstantFP*>(TV->getConstantFPValue())
};
const Type *FPTy = Elts[0]->getType();
const TargetData &TD = *TLI.getTargetData();
Constant *CA = ConstantArray::get(ArrayType::get(FPTy, 2), Elts, 2);
SDValue CPIdx = DAG.getConstantPool(CA, TLI.getPointerTy(),
TD.getPrefTypeAlignment(FPTy));
unsigned Alignment = cast<ConstantPoolSDNode>(CPIdx)->getAlignment();
SDValue Zero = DAG.getIntPtrConstant(0);
unsigned EltSize = (unsigned)TD.getTypePaddedSize(Elts[0]->getType());
SDValue One = DAG.getIntPtrConstant(EltSize);
SDValue Cond = DAG.getSetCC(DL,
TLI.getSetCCResultType(N0.getValueType()),
N0, N1, CC);
SDValue CstOffset = DAG.getNode(ISD::SELECT, DL, Zero.getValueType(),
Cond, One, Zero);
CPIdx = DAG.getNode(ISD::ADD, DL, TLI.getPointerTy(), CPIdx,
CstOffset);
return DAG.getLoad(TV->getValueType(0), DL, DAG.getEntryNode(), CPIdx,
PseudoSourceValue::getConstantPool(), 0, false,
Alignment);
}
}
if (N1C && N3C && N3C->isNullValue() && CC == ISD::SETLT &&
N0.getValueType().isInteger() &&
N2.getValueType().isInteger() &&
(N1C->isNullValue() || (N1C->getAPIntValue() == 1 && N0 == N2))) { MVT XType = N0.getValueType();
MVT AType = N2.getValueType();
if (XType.bitsGE(AType)) {
if (N2C && ((N2C->getAPIntValue() & (N2C->getAPIntValue()-1)) == 0)) {
unsigned ShCtV = N2C->getAPIntValue().logBase2();
ShCtV = XType.getSizeInBits()-ShCtV-1;
SDValue ShCt = DAG.getConstant(ShCtV, getShiftAmountTy());
SDValue Shift = DAG.getNode(ISD::SRL, N0.getDebugLoc(),
XType, N0, ShCt);
AddToWorkList(Shift.getNode());
if (XType.bitsGT(AType)) {
Shift = DAG.getNode(ISD::TRUNCATE, DL, AType, Shift);
AddToWorkList(Shift.getNode());
}
return DAG.getNode(ISD::AND, DL, AType, Shift, N2);
}
SDValue Shift = DAG.getNode(ISD::SRA, N0.getDebugLoc(),
XType, N0,
DAG.getConstant(XType.getSizeInBits()-1,
getShiftAmountTy()));
AddToWorkList(Shift.getNode());
if (XType.bitsGT(AType)) {
Shift = DAG.getNode(ISD::TRUNCATE, DL, AType, Shift);
AddToWorkList(Shift.getNode());
}
return DAG.getNode(ISD::AND, DL, AType, Shift, N2);
}
}
if (N2C && N3C && N3C->isNullValue() && N2C->getAPIntValue().isPowerOf2() &&
TLI.getBooleanContents() == TargetLowering::ZeroOrOneBooleanContent) {
if (NotExtCompare && N2C->getAPIntValue() == 1)
return SDValue();
SDValue Temp, SCC;
if (LegalTypes) {
SCC = DAG.getSetCC(DL, TLI.getSetCCResultType(N0.getValueType()),
N0, N1, CC);
if (N2.getValueType().bitsLT(SCC.getValueType()))
Temp = DAG.getZeroExtendInReg(SCC, N2.getDebugLoc(), N2.getValueType());
else
Temp = DAG.getNode(ISD::ZERO_EXTEND, N2.getDebugLoc(),
N2.getValueType(), SCC);
} else {
SCC = DAG.getSetCC(N0.getDebugLoc(), MVT::i1, N0, N1, CC);
Temp = DAG.getNode(ISD::ZERO_EXTEND, N2.getDebugLoc(),
N2.getValueType(), SCC);
}
AddToWorkList(SCC.getNode());
AddToWorkList(Temp.getNode());
if (N2C->getAPIntValue() == 1)
return Temp;
return DAG.getNode(ISD::SHL, DL, N2.getValueType(), Temp,
DAG.getConstant(N2C->getAPIntValue().logBase2(),
getShiftAmountTy()));
}
if (0 && N3C && N3C->isNullValue() && N2C && (N2C->getAPIntValue() == 1ULL)) {
MVT XType = N0.getValueType();
if (!LegalOperations ||
TLI.isOperationLegal(ISD::SETCC, TLI.getSetCCResultType(XType))) {
SDValue Res = DAG.getSetCC(DL, TLI.getSetCCResultType(XType), N0, N1, CC);
if (Res.getValueType() != VT)
Res = DAG.getNode(ISD::ZERO_EXTEND, DL, VT, Res);
return Res;
}
if (N1C && N1C->isNullValue() && CC == ISD::SETEQ &&
(!LegalOperations ||
TLI.isOperationLegal(ISD::CTLZ, XType))) {
SDValue Ctlz = DAG.getNode(ISD::CTLZ, N0.getDebugLoc(), XType, N0);
return DAG.getNode(ISD::SRL, DL, XType, Ctlz,
DAG.getConstant(Log2_32(XType.getSizeInBits()),
getShiftAmountTy()));
}
if (N1C && N1C->isNullValue() && CC == ISD::SETGT) {
SDValue NegN0 = DAG.getNode(ISD::SUB, N0.getDebugLoc(),
XType, DAG.getConstant(0, XType), N0);
SDValue NotN0 = DAG.getNOT(N0.getDebugLoc(), N0, XType);
return DAG.getNode(ISD::SRL, DL, XType,
DAG.getNode(ISD::AND, DL, XType, NegN0, NotN0),
DAG.getConstant(XType.getSizeInBits()-1,
getShiftAmountTy()));
}
if (N1C && N1C->isAllOnesValue() && CC == ISD::SETGT) {
SDValue Sign = DAG.getNode(ISD::SRL, N0.getDebugLoc(), XType, N0,
DAG.getConstant(XType.getSizeInBits()-1,
getShiftAmountTy()));
return DAG.getNode(ISD::XOR, DL, XType, Sign, DAG.getConstant(1, XType));
}
}
if (N1C && N1C->isNullValue() && (CC == ISD::SETLT || CC == ISD::SETLE) &&
N0 == N3 && N2.getOpcode() == ISD::SUB && N0 == N2.getOperand(1) &&
N2.getOperand(0) == N1 && N0.getValueType().isInteger()) {
MVT XType = N0.getValueType();
SDValue Shift = DAG.getNode(ISD::SRA, N0.getDebugLoc(), XType, N0,
DAG.getConstant(XType.getSizeInBits()-1,
getShiftAmountTy()));
SDValue Add = DAG.getNode(ISD::ADD, N0.getDebugLoc(), XType,
N0, Shift);
AddToWorkList(Shift.getNode());
AddToWorkList(Add.getNode());
return DAG.getNode(ISD::XOR, DL, XType, Add, Shift);
}
if (N1C && N1C->isAllOnesValue() && CC == ISD::SETGT &&
N0 == N2 && N3.getOpcode() == ISD::SUB && N0 == N3.getOperand(1)) {
if (ConstantSDNode *SubC = dyn_cast<ConstantSDNode>(N3.getOperand(0))) {
MVT XType = N0.getValueType();
if (SubC->isNullValue() && XType.isInteger()) {
SDValue Shift = DAG.getNode(ISD::SRA, N0.getDebugLoc(), XType,
N0,
DAG.getConstant(XType.getSizeInBits()-1,
getShiftAmountTy()));
SDValue Add = DAG.getNode(ISD::ADD, N0.getDebugLoc(),
XType, N0, Shift);
AddToWorkList(Shift.getNode());
AddToWorkList(Add.getNode());
return DAG.getNode(ISD::XOR, DL, XType, Add, Shift);
}
}
}
return SDValue();
}
SDValue DAGCombiner::SimplifySetCC(MVT VT, SDValue N0,
SDValue N1, ISD::CondCode Cond,
DebugLoc DL, bool foldBooleans) {
TargetLowering::DAGCombinerInfo
DagCombineInfo(DAG, Level == Unrestricted, false, this);
return TLI.SimplifySetCC(VT, N0, N1, Cond, foldBooleans, DagCombineInfo, DL);
}
SDValue DAGCombiner::BuildSDIV(SDNode *N) {
std::vector<SDNode*> Built;
SDValue S = TLI.BuildSDIV(N, DAG, &Built);
for (std::vector<SDNode*>::iterator ii = Built.begin(), ee = Built.end();
ii != ee; ++ii)
AddToWorkList(*ii);
return S;
}
SDValue DAGCombiner::BuildUDIV(SDNode *N) {
std::vector<SDNode*> Built;
SDValue S = TLI.BuildUDIV(N, DAG, &Built);
for (std::vector<SDNode*>::iterator ii = Built.begin(), ee = Built.end();
ii != ee; ++ii)
AddToWorkList(*ii);
return S;
}
static bool FindBaseOffset(SDValue Ptr, SDValue &Base, int64_t &Offset) {
Base = Ptr; Offset = 0;
if (Base.getOpcode() == ISD::ADD) {
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Base.getOperand(1))) {
Base = Base.getOperand(0);
Offset += C->getZExtValue();
}
}
return isa<FrameIndexSDNode>(Base) ||
isa<ConstantPoolSDNode>(Base) ||
isa<GlobalAddressSDNode>(Base);
}
bool DAGCombiner::isAlias(SDValue Ptr1, int64_t Size1,
const Value *SrcValue1, int SrcValueOffset1,
SDValue Ptr2, int64_t Size2,
const Value *SrcValue2, int SrcValueOffset2) const {
if (Ptr1 == Ptr2) return true;
SDValue Base1, Base2;
int64_t Offset1, Offset2;
bool KnownBase1 = FindBaseOffset(Ptr1, Base1, Offset1);
bool KnownBase2 = FindBaseOffset(Ptr2, Base2, Offset2);
if (Base1 == Base2)
return !((Offset1 + Size1) <= Offset2 || (Offset2 + Size2) <= Offset1);
if (KnownBase1 && KnownBase2) return false;
if (CombinerGlobalAA) {
int64_t MinOffset = std::min(SrcValueOffset1, SrcValueOffset2);
int64_t Overlap1 = Size1 + SrcValueOffset1 - MinOffset;
int64_t Overlap2 = Size2 + SrcValueOffset2 - MinOffset;
AliasAnalysis::AliasResult AAResult =
AA.alias(SrcValue1, Overlap1, SrcValue2, Overlap2);
if (AAResult == AliasAnalysis::NoAlias)
return false;
}
return true;
}
bool DAGCombiner::FindAliasInfo(SDNode *N,
SDValue &Ptr, int64_t &Size,
const Value *&SrcValue, int &SrcValueOffset) const {
if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
Ptr = LD->getBasePtr();
Size = LD->getMemoryVT().getSizeInBits() >> 3;
SrcValue = LD->getSrcValue();
SrcValueOffset = LD->getSrcValueOffset();
return true;
} else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
Ptr = ST->getBasePtr();
Size = ST->getMemoryVT().getSizeInBits() >> 3;
SrcValue = ST->getSrcValue();
SrcValueOffset = ST->getSrcValueOffset();
} else {
assert(0 && "FindAliasInfo expected a memory operand");
}
return false;
}
void DAGCombiner::GatherAllAliases(SDNode *N, SDValue OriginalChain,
SmallVector<SDValue, 8> &Aliases) {
SmallVector<SDValue, 8> Chains; std::set<SDNode *> Visited;
SDValue Ptr;
int64_t Size;
const Value *SrcValue;
int SrcValueOffset;
bool IsLoad = FindAliasInfo(N, Ptr, Size, SrcValue, SrcValueOffset);
Chains.push_back(OriginalChain);
while (!Chains.empty()) {
SDValue Chain = Chains.back();
Chains.pop_back();
if (Visited.find(Chain.getNode()) != Visited.end()) continue;
Visited.insert(Chain.getNode());
switch (Chain.getOpcode()) {
case ISD::EntryToken:
break;
case ISD::LOAD:
case ISD::STORE: {
SDValue OpPtr;
int64_t OpSize;
const Value *OpSrcValue;
int OpSrcValueOffset;
bool IsOpLoad = FindAliasInfo(Chain.getNode(), OpPtr, OpSize,
OpSrcValue, OpSrcValueOffset);
if (!(IsLoad && IsOpLoad) &&
isAlias(Ptr, Size, SrcValue, SrcValueOffset,
OpPtr, OpSize, OpSrcValue, OpSrcValueOffset)) {
Aliases.push_back(Chain);
} else {
Chains.push_back(Chain.getOperand(0));
AddToWorkList(Chain.getNode());
}
break;
}
case ISD::TokenFactor:
for (unsigned n = Chain.getNumOperands(); n;)
Chains.push_back(Chain.getOperand(--n));
AddToWorkList(Chain.getNode());
break;
default:
Aliases.push_back(Chain);
break;
}
}
}
SDValue DAGCombiner::FindBetterChain(SDNode *N, SDValue OldChain) {
SmallVector<SDValue, 8> Aliases;
GatherAllAliases(N, OldChain, Aliases);
if (Aliases.size() == 0) {
return DAG.getEntryNode();
} else if (Aliases.size() == 1) {
return Aliases[0];
}
SDValue NewChain = DAG.getNode(ISD::TokenFactor, N->getDebugLoc(), MVT::Other,
&Aliases[0], Aliases.size());
if (NewChain != OldChain) AddToWorkList(OldChain.getNode());
return NewChain;
}
void SelectionDAG::Combine(CombineLevel Level, AliasAnalysis &AA,
CodeGenOpt::Level OptLevel) {
DAGCombiner(*this, AA, OptLevel).Run(Level);
}