https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94915
Bug ID: 94915
Summary: MAX_EXPR weirdly optimized on x86 with -mtune=core2
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: gabravier at gmail dot com
Target Milestone: ---
int f(int x, int y)
{
return x > y ? x : y;
}
When compiling with -O3 -mtune=core2 -msse4.1, GCC outputs this :
f(int, int):
movd xmm0, edi
movd xmm1, esi
pmaxsd xmm0, xmm1
movd eax, xmm0
ret
It would seem rather doubtful that this is the optimal solution for doing max
over a simple compare+cmov
