https://bugs.llvm.org/show_bug.cgi?id=38781
Bug ID: 38781
Summary: Missed pattern (A >= 0) & (B >= 0)
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: david.bolvan...@gmail.com
CC: llvm-bugs@lists.llvm.org
int pat1 (int a, int b)
{
return (a >= 0) & (b >= 0); // can be transformed to (a | b) >= 0)
}
Clang:
pat1(int, int): # @pat1(int, int)
shr edi, 31
xor edi, 1
shr esi, 31
not esi
and esi, edi
mov eax, esi
ret
GCC:
pat1(int, int):
mov eax, esi
or eax, edi
not eax
shr eax, 31
ret
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