https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102381
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
Last reconfirmed| |2021-09-17
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.
....
[AFTER NORMALIZATION -- [DEF]:
ipp_28 = PHI <ipp_23(17), ipp_11(D)(15)>
is guarded by :
i2.2_26 > 0 (.AND.) i1_10(D) != 0
....
[AFTER NORMALIZATION -- [USE]:
ipp_27 = PHI <ipp_28(21), ipp_23(18)>
is guarded by :
i1_10(D) != 0 (.AND.) (.NOT.) i4_17 < prephitmp_25 (.AND.) _2 == 0
(.OR.)
i1_10(D) != 0 (.AND.) (.NOT.) i4_17 < prephitmp_25 (.AND.) i3.0_1 & 1
...
_2 = i3.0_1 & 1;
So there is a missing simplification
It should have been:
i1_10(D) != 0 (.AND.) (.NOT.) i4_17 < prephitmp_25
prephitmp_25 is defined as:
# prephitmp_25 = PHI <i2.2_26(17), i2.2_21(15)>
So i2.2_26 (as i2.2_21 is the one on the branch which would have been
uninitialized).
So we are down to:
i1_10(D) != 0 (.AND.) (.NOT.) i4_17 < i2.2_26
i4_17 is the loop IV so it should be discarded.
