https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106243
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|Failure to optimize (0 - x) |Failure to optimize (0 - x)
|& 1 on vector type |& 1 on gimple level
| |(including vector types)
Ever confirmed|0 |1
Last reconfirmed| |2022-07-10
Status|UNCONFIRMED |NEW
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed, even scalar version is not optimized on the gimple level:
int f1(int x)
{
x = -x;
return x & 1;
}
RTL level is done during combine for the scalar version:
Trying 6 -> 7:
6: {r86:SI=-r87:SI;clobber flags:CC;}
REG_DEAD r87:SI
REG_UNUSED flags:CC
7: {r85:SI=r86:SI&0x1;clobber flags:CC;}
REG_DEAD r86:SI
REG_UNUSED flags:CC
Successfully matched this instruction:
(parallel [
(set (reg:SI 85)
(and:SI (reg:SI 87)
(const_int 1 [0x1])))
(clobber (reg:CC 17 flags))
])
