https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113651
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2024-01-29
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. This is a missed phiopt (or operation sinking) of
if (r.1_90 < 0)
goto <bb 6>; [41.00%]
else
goto <bb 7>; [59.00%]
<bb 6> [local count: 391324129]:
_91 = _89 ^ 79764919;
<bb 7> [local count: 954449104]:
# prephitmp_92 = PHI <_91(6), _89(5)>
to sth like
if (r.1_90 < 0)
goto <bb 6>; [41.00%]
else
goto <bb 7>; [59.00%]
<bb 6> [local count: 391324129]:
<bb 7> [local count: 954449104]:
# prephitmp_91 = PHI <79764919(6), 0(5)>
_92 = _89 ^ prephitmp_xx;
on some archs the conditional constant might be generated by a
conditional add of 79764919 to zero.
Whether this is better suited for GIMPLE or RTL if-conversion remains to be
seen.
That splitting the expression helps is just luck.
