https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95737
HaoChen Gui <guihaoc at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |guihaoc at gcc dot gnu.org
--- Comment #6 from HaoChen Gui <guihaoc at gcc dot gnu.org> ---
//source code
unsigned long long negativeLessThan(unsigned long long a, unsigned long long b)
{
return -(a < b);
}
//P8 with -O2
subfc 4,4,3
subfe 3,3,3
extsw 3,3
//P9 with -O2
li 10,0
li 9,1
cmpld 0,3,4
isel 3,9,10,0
neg 3,3
Seems cmp+isel on P9 is sub-optimal.
