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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/113833] 435.gromacs fails verification on
 with -Ofast -march={cascadelake,icelake-server} and PGO after
 r14-7272-g57f611604e8bab
Date: Fri, 09 Feb 2024 06:52:23 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113833

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
I suspect the issue would pop up with -Ofast -fno-vect-cost-model for any
sub-architecture.  The patch referenced just adjusts costs for doing BB
vectorization (and there's reductions there as well).  It might be interest=
ing
to offer more high-level knobs to tune for vectorization, say
-fno-vect-bb-reduction or -fforce-in-order-bb-reduction-vectorization.

A compare before/after the patch of -fopt-info-vec output might show the few
cases that are affected by the patch.=