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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/111125] [14 Regression] tree-ssa.exp and vect.exp
 failures after commit r14-3281-g99b5921bfc8f91
Date: Thu, 24 Aug 2023 08:44:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111125

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
For gcc.dg/vect/bb-slp-29.c we are now vectorizing

#pragma GCC novector
  for (i =3D 0; i < N/2; i++)
    {
      if (dst[i] !=3D A * src[i] + B * src[i+1])
        abort ();
    }

in particular the multiplication and the addition (but not the load which
had predictive commoning applied).  When cost modeling is enabled this
vectorization is not deemed profitable (but the vect testsuite runs with
-fno-vect-cost-model).

I wonder if we want to excempt basic blocks within loops marked with novect=
or
from BB vectorization.=