forked from OSchip/llvm-project
74 lines
1.6 KiB
LLVM
74 lines
1.6 KiB
LLVM
; RUN: opt < %s -licm -S | FileCheck %s
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@X = global i32 7 ; <i32*> [#uses=4]
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define void @test1(i32 %i) {
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Entry:
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br label %Loop
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; CHECK: @test1
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; CHECK: Entry:
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; CHECK-NEXT: load i32* @X
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; CHECK-NEXT: br label %Loop
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Loop: ; preds = %Loop, %0
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%j = phi i32 [ 0, %Entry ], [ %Next, %Loop ] ; <i32> [#uses=1]
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%x = load i32* @X ; <i32> [#uses=1]
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%x2 = add i32 %x, 1 ; <i32> [#uses=1]
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store i32 %x2, i32* @X
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%Next = add i32 %j, 1 ; <i32> [#uses=2]
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%cond = icmp eq i32 %Next, 0 ; <i1> [#uses=1]
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br i1 %cond, label %Out, label %Loop
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Out:
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ret void
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; CHECK: Out:
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; CHECK-NEXT: store i32 %x2, i32* @X
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; CHECK-NEXT: ret void
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}
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define void @test2(i32 %i) {
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Entry:
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br label %Loop
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; CHECK: @test2
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; CHECK: Entry:
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; CHECK-NEXT: %X1 = getelementptr i32* @X, i64 0
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; CHECK-NEXT: %X2 = getelementptr i32* @X, i64 0
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; CHECK-NEXT: %X1.promoted = load i32* %X1
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; CHECK-NEXT: br label %Loop
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Loop: ; preds = %Loop, %0
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%X1 = getelementptr i32* @X, i64 0 ; <i32*> [#uses=1]
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%A = load i32* %X1 ; <i32> [#uses=1]
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%V = add i32 %A, 1 ; <i32> [#uses=1]
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%X2 = getelementptr i32* @X, i64 0 ; <i32*> [#uses=1]
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store i32 %V, i32* %X2
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br i1 false, label %Loop, label %Exit
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Exit: ; preds = %Loop
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ret void
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; CHECK: Exit:
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; CHECK-NEXT: store i32 %V, i32* %X1
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; CHECK-NEXT: ret void
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}
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define void @test3(i32 %i) {
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; CHECK: @test3
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br label %Loop
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Loop:
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; Should not promote this to a register
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%x = volatile load i32* @X
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%x2 = add i32 %x, 1
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store i32 %x2, i32* @X
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br i1 true, label %Out, label %Loop
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; CHECK: Loop:
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; CHECK-NEXT: volatile load
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Out: ; preds = %Loop
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ret void
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}
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