768a1ca5ec
abs should only produce a positive value or the signed minimum value. This means we can't fold abs(undef) to undef as that would allow more values. Fold to 0 instead to match InstSimplify. Fixes test mentioned in comment on pr55271. Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D126174
16 lines
423 B
LLVM
16 lines
423 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu | FileCheck %s
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; abs(undef) should fold to 0 not undef.
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declare i32 @llvm.abs.i32(i32, i1 immarg) #0
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define i32 @abs(i32 %0) {
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; CHECK-LABEL: abs:
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; CHECK: # %bb.0:
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; CHECK-NEXT: xorl %eax, %eax
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; CHECK-NEXT: retq
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%2 = call i32 @llvm.abs.i32(i32 undef, i1 false)
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ret i32 %2
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}
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