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e4dc717585
OnlyReadsMemoryFns tables are dead! We get more, and more accurate, information from gcc via the readnone and readonly function attributes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44288 91177308-0d34-0410-b5e6-96231b3b80d8
15 lines
393 B
LLVM
15 lines
393 B
LLVM
; RUN: llvm-as < %s | opt -basicaa -load-vn -gcse -instcombine | llvm-dis | not grep sub
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declare i32 @strlen(i8*) readonly
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declare void @use(i32)
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define i8 @test(i8* %P, i8* %Q) {
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%A = load i8* %Q ; <i8> [#uses=1]
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%X = call i32 @strlen( i8* %P ) readonly ; <i32> [#uses=1]
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%B = load i8* %Q ; <i8> [#uses=1]
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call void @use( i32 %X )
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%C = sub i8 %A, %B ; <i8> [#uses=1]
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ret i8 %C
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}
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