; RUN: opt < %s -basicaa -licm -S | FileCheck %s
target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
@X = global i32 7 ; <i32*> [#uses=4]
define void @test1(i32 %i) {
Entry:
br label %Loop
; CHECK: @test1
; CHECK: Entry:
; CHECK-NEXT: load i32* @X
; CHECK-NEXT: br label %Loop
Loop: ; preds = %Loop, %0
%j = phi i32 [ 0, %Entry ], [ %Next, %Loop ] ; <i32> [#uses=1]
%x = load i32* @X ; <i32> [#uses=1]
%x2 = add i32 %x, 1 ; <i32> [#uses=1]
store i32 %x2, i32* @X
%Next = add i32 %j, 1 ; <i32> [#uses=2]
%cond = icmp eq i32 %Next, 0 ; <i1> [#uses=1]
br i1 %cond, label %Out, label %Loop
Out:
ret void
; CHECK: Out:
; CHECK-NEXT: store i32 %x2, i32* @X
; CHECK-NEXT: ret void
}
define void @test2(i32 %i) {
Entry:
br label %Loop
; CHECK: @test2
; CHECK: Entry:
; CHECK-NEXT: %.promoted = load i32* getelementptr inbounds (i32* @X, i64 1)
; CHECK-NEXT: br label %Loop
Loop: ; preds = %Loop, %0
%X1 = getelementptr i32* @X, i64 1 ; <i32*> [#uses=1]
%A = load i32* %X1 ; <i32> [#uses=1]
%V = add i32 %A, 1 ; <i32> [#uses=1]
%X2 = getelementptr i32* @X, i64 1 ; <i32*> [#uses=1]
store i32 %V, i32* %X2
br i1 false, label %Loop, label %Exit
Exit: ; preds = %Loop
ret void
; CHECK: Exit:
; CHECK-NEXT: store i32 %V, i32* getelementptr inbounds (i32* @X, i64 1)
; CHECK-NEXT: ret void
}
define void @test3(i32 %i) {
; CHECK: @test3
br label %Loop
Loop:
; Should not promote this to a register
%x = load volatile i32* @X
%x2 = add i32 %x, 1
store i32 %x2, i32* @X
br i1 true, label %Out, label %Loop
; CHECK: Loop:
; CHECK-NEXT: load volatile
Out: ; preds = %Loop
ret void
}
; PR8041
define void @test4(i8* %x, i8 %n) {
; CHECK: @test4
%handle1 = alloca i8*
%handle2 = alloca i8*
store i8* %x, i8** %handle1
br label %loop
loop:
%tmp = getelementptr i8* %x, i64 8
store i8* %tmp, i8** %handle2
br label %subloop
subloop:
%count = phi i8 [ 0, %loop ], [ %nextcount, %subloop ]
%offsetx2 = load i8** %handle2
store i8 %n, i8* %offsetx2
%newoffsetx2 = getelementptr i8* %offsetx2, i64 -1
store i8* %newoffsetx2, i8** %handle2
%nextcount = add i8 %count, 1
%innerexitcond = icmp sge i8 %nextcount, 8
br i1 %innerexitcond, label %innerexit, label %subloop
; Should have promoted 'handle2' accesses.
; CHECK: subloop:
; CHECK-NEXT: phi i8* [
; CHECK-NEXT: %count = phi i8 [
; CHECK-NEXT: store i8 %n
; CHECK-NOT: store
; CHECK: br i1
innerexit:
%offsetx1 = load i8** %handle1
%val = load i8* %offsetx1
%cond = icmp eq i8 %val, %n
br i1 %cond, label %exit, label %loop
; Should not have promoted offsetx1 loads.
; CHECK: innerexit:
; CHECK: %val = load i8* %offsetx1
; CHECK: %cond = icmp eq i8 %val, %n
; CHECK: br i1 %cond, label %exit, label %loop
exit:
ret void
}
define void @test5(i32 %i, i32** noalias %P2) {
Entry:
br label %Loop
; CHECK: @test5
; CHECK: Entry:
; CHECK-NEXT: load i32* @X
; CHECK-NEXT: br label %Loop
Loop: ; preds = %Loop, %0
%j = phi i32 [ 0, %Entry ], [ %Next, %Loop ] ; <i32> [#uses=1]
%x = load i32* @X ; <i32> [#uses=1]
%x2 = add i32 %x, 1 ; <i32> [#uses=1]
store i32 %x2, i32* @X
store volatile i32* @X, i32** %P2
%Next = add i32 %j, 1 ; <i32> [#uses=2]
%cond = icmp eq i32 %Next, 0 ; <i1> [#uses=1]
br i1 %cond, label %Out, label %Loop
Out:
ret void
; CHECK: Out:
; CHECK-NEXT: store i32 %x2, i32* @X
; CHECK-NEXT: ret void
}