https://bugs.llvm.org/show_bug.cgi?id=45761
Bug ID: 45761
Summary: Failure to optimize arithmetic around abs
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Support Libraries
Assignee: unassignedb...@nondot.org
Reporter: gabrav...@gmail.com
CC: llvm-bugs@lists.llvm.org
#define abs __builtin_abs
int f(int x, int y)
{
return abs(x - y + (int)0x80000000);
}
With -O3, GCC outputs this :
f(int, int):
sub esi, edi
lea eax, [rsi-2147483648]
ret
LLVM outputs this :
f(int, int): # @f(int, int)
mov eax, edi
sub eax, esi
or eax, -2147483648
neg eax
ret
--
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