https://bugs.llvm.org/show_bug.cgi?id=45755
Bug ID: 45755
Summary: Failure to recognize andn-like pattern
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: gabrav...@gmail.com
CC: llvm-bugs@lists.llvm.org
int f(int x)
{
return ~(x | -x);
}
With -O3, GCC outputs this :
f(int):
lea eax, [rdi-1]
andn eax, edi, eax
ret
LLVM outputs this :
f(int): # @f(int)
mov eax, edi
neg eax
or eax, edi
not eax
ret
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