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We use constant folding to see if an intrinsic evaluates to the same value as a constant that we know. If we don't take the undefinedness into account we get a value that doesn't match the actual implementation, and miscompiled code. This was uncovered by Chandler's simplifycfg changes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173356 91177308-0d34-0410-b5e6-96231b3b80d8
9 lines
178 B
LLVM
9 lines
178 B
LLVM
; RUN: opt < %s -constprop -S | grep "ret i13 13"
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; PR1816
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declare i13 @llvm.cttz.i13(i13, i1)
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define i13 @test() {
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%X = call i13 @llvm.cttz.i13(i13 0, i1 false)
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ret i13 %X
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}
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