https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114234
Tamar Christina <tnfchris at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2024-03-05
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
--- Comment #3 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
started with
commit g:324d2907c86f05e40dc52d226940308f53a956c2
Author: Richard Biener <rguent...@suse.de>
Date: Mon Mar 4 09:46:13 2024 +0100
tree-optimization/114192 - scalar reduction kept live with early break vect
The following fixes a missing replacement of the reduction value
used in the epilog, causing the scalar reduction to be kept live
across the early break exit path.
PR tree-optimization/114192
* tree-vect-loop.cc (vect_create_epilog_for_reduction): Use the
appropriate def for the live out stmt in case of an alternate
exit.
the reduction seems to propagate out a single value for both exits:
# a_39 = PHI <stmp_a_9.10_95(10), stmp_a_9.10_95(15)>
but since the PHI nodes carry their reduction values in the exits we have
different reduction statements, so using the same reduction value for all exit
is wrong.
should be
# a_39 = PHI <stmp_a_9.10_89(10), stmp_a_9.10_95(15)>
