https://gcc.gnu.org/bugzilla/show_bug.cgi?id=14504
Steven Bosscher <steven at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed|2009-04-22 23:02:33 |2019-3-4
--- Comment #9 from Steven Bosscher <steven at gcc dot gnu.org> ---
// -O3 -m32 -fomit-frame-pointer
unsigned long cond_mask_1(bool flag, unsigned long mask, unsigned long target)
{
return flag ? target | mask : target & ~mask;
}
unsigned long cond_mask_2(bool flag, unsigned long mask, unsigned long target)
{
return (mask | target ^ 0xFFFFFFFFUL + flag) ^ 0xFFFFFFFFUL + flag;
}
GCC trunk:
cond_mask_1(bool, unsigned long, unsigned long):
movl 12(%esp), %eax
movl 8(%esp), %edx
movl %eax, %ecx
orl %edx, %ecx
notl %edx
andl %eax, %edx
cmpb $0, 4(%esp)
movl %ecx, %eax
cmove %edx, %eax
ret
cond_mask_2(bool, unsigned long, unsigned long):
movzbl 4(%esp), %eax
leal -1(%eax), %edx
movl 12(%esp), %eax
xorl %edx, %eax
orl 8(%esp), %eax
xorl %edx, %eax
ret
