DelaySlotFiller.cpp [plain text]
#define DEBUG_TYPE "delayslotfiller"
#include "Sparc.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/ADT/Statistic.h"
using namespace llvm;
STATISTIC(FilledSlots, "Number of delay slots filled");
namespace {
struct Filler : public MachineFunctionPass {
TargetMachine &TM;
const TargetInstrInfo *TII;
static char ID;
Filler(TargetMachine &tm)
: MachineFunctionPass(&ID), TM(tm), TII(tm.getInstrInfo()) { }
virtual const char *getPassName() const {
return "SPARC Delay Slot Filler";
}
bool runOnMachineBasicBlock(MachineBasicBlock &MBB);
bool runOnMachineFunction(MachineFunction &F) {
bool Changed = false;
for (MachineFunction::iterator FI = F.begin(), FE = F.end();
FI != FE; ++FI)
Changed |= runOnMachineBasicBlock(*FI);
return Changed;
}
};
char Filler::ID = 0;
}
FunctionPass *llvm::createSparcDelaySlotFillerPass(TargetMachine &tm) {
return new Filler(tm);
}
bool Filler::runOnMachineBasicBlock(MachineBasicBlock &MBB) {
bool Changed = false;
for (MachineBasicBlock::iterator I = MBB.begin(); I != MBB.end(); ++I)
if (I->getDesc().hasDelaySlot()) {
MachineBasicBlock::iterator J = I;
++J;
BuildMI(MBB, J, DebugLoc(), TII->get(SP::NOP));
++FilledSlots;
Changed = true;
}
return Changed;
}