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https://github.com/c64scene-ar/llvm-6502.git
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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
13 lines
408 B
LLVM
13 lines
408 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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define i32 @test(i8* %P) {
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%X = call i32 @strlen( i8* %P ) readonly ; <i32> [#uses=2]
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%A = add i32 %X, 14 ; <i32> [#uses=1]
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%Y = call i32 @strlen( i8* %P ) readonly ; <i32> [#uses=1]
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%Z = sub i32 %X, %Y ; <i32> [#uses=1]
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%B = add i32 %A, %Z ; <i32> [#uses=1]
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ret i32 %B
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}
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