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43 lines
1.5 KiB
LLVM
43 lines
1.5 KiB
LLVM
; Test that LICM uses basicaa to do alias analysis, which is capable of
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; disambiguating some obvious cases. If LICM is able to disambiguate the
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; two pointers, then the load should be hoisted, and the store sunk. Thus
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; the loop becomes empty and can be deleted by ADCE.
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; RUN: llvm-as < %s | opt -basicaa -licm --adce | llvm-dis | not grep Loop
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@A = global i32 7 ; <i32*> [#uses=3]
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@B = global i32 8 ; <i32*> [#uses=2]
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@C = global [2 x i32] [ i32 4, i32 8 ] ; <[2 x i32]*> [#uses=2]
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define i32 @test(i1 %c) {
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%Atmp = load i32* @A ; <i32> [#uses=2]
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br label %Loop
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Loop: ; preds = %Loop, %0
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%ToRemove = load i32* @A ; <i32> [#uses=1]
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store i32 %Atmp, i32* @B
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br i1 %c, label %Out, label %Loop
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Out: ; preds = %Loop
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%X = sub i32 %ToRemove, %Atmp ; <i32> [#uses=1]
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ret i32 %X
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}
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define i32 @test2(i1 %c) {
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br label %Loop
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Loop: ; preds = %Loop, %0
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%AVal = load i32* @A ; <i32> [#uses=2]
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%C0 = getelementptr [2 x i32]* @C, i64 0, i64 0 ; <i32*> [#uses=1]
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store i32 %AVal, i32* %C0
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%BVal = load i32* @B ; <i32> [#uses=2]
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%C1 = getelementptr [2 x i32]* @C, i64 0, i64 1 ; <i32*> [#uses=1]
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store i32 %BVal, i32* %C1
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br i1 %c, label %Out, label %Loop
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Out: ; preds = %Loop
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%X = sub i32 %AVal, %BVal ; <i32> [#uses=1]
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ret i32 %X
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}
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