https://bugs.llvm.org/show_bug.cgi?id=39475
Bug ID: 39475
Summary: Failure to simplify -std::abs(a) <= 0
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Common Code Generator Code
Assignee: unassignedb...@nondot.org
Reporter: llvm-...@redking.me.uk
CC: fil...@gmail.com, llvm-bugs@lists.llvm.org,
spatel+l...@rotateright.com, til...@gmail.com
#include <algorithm>
bool bar(int a)
{
return -std::abs(a) <= 0;
}
https://godbolt.org/z/8CYqjj
clang:
_Z3bari: # @_Z3bari
movl %edi, %eax
negl %eax
testl %edi, %edi
cmovsl %edi, %eax
testl %eax, %eax
setle %al
retq
gcc:
_Z3bari:
movl $1, %eax
ret
--
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