forked from OSchip/llvm-project
24 lines
791 B
LLVM
24 lines
791 B
LLVM
; Test that pure functions are cse'd away
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; RUN: opt < %s -globalsmodref-aa -gvn -instcombine | \
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; RUN: llvm-dis | not grep sub
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define i32 @pure(i32 %X) {
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%Y = add i32 %X, 1 ; <i32> [#uses=1]
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ret i32 %Y
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}
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define i32 @test1(i32 %X) {
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%A = call i32 @pure( i32 %X ) ; <i32> [#uses=1]
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%B = call i32 @pure( i32 %X ) ; <i32> [#uses=1]
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%C = sub i32 %A, %B ; <i32> [#uses=1]
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ret i32 %C
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}
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define i32 @test2(i32 %X, i32* %P) {
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%A = call i32 @pure( i32 %X ) ; <i32> [#uses=1]
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store i32 %X, i32* %P ;; Does not invalidate 'pure' call.
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%B = call i32 @pure( i32 %X ) ; <i32> [#uses=1]
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%C = sub i32 %A, %B ; <i32> [#uses=1]
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ret i32 %C
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}
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