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21 lines
641 B
LLVM
21 lines
641 B
LLVM
; This testcase makes sure that size is taken to account when alias analysis
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; is performed. It is not legal to delete the second load instruction because
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; the value computed by the first load instruction is changed by the store.
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; RUN: opt < %s -basicaa -gvn -instcombine -S | FileCheck %s
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define i32 @test() {
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; CHECK: %Y.DONOTREMOVE = load i32* %A
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; CHECK: %Z = sub i32 0, %Y.DONOTREMOVE
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%A = alloca i32
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store i32 0, i32* %A
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%X = load i32* %A
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%B = bitcast i32* %A to i8*
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%C = getelementptr i8* %B, i64 1
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store i8 1, i8* %C ; Aliases %A
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%Y.DONOTREMOVE = load i32* %A
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%Z = sub i32 %X, %Y.DONOTREMOVE
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ret i32 %Z
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}
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