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Subject: [Bug tree-optimization/103253] [12 Regression] ICE: Segmentation
 fault (in convert_mult_to_fma or in vect_recog_mask_conversion_pattern) since
 r12-5129-g8ed62c929c7c4462
Date: Thu, 18 Nov 2021 11:24:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103253

--- Comment #11 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Tamar Christina <tnfchris@gcc.gnu.org=
>:

https://gcc.gnu.org/g:1a0bce98dcf84dd0a7b3ac67b51ac68758cc7ad0

commit r12-5369-g1a0bce98dcf84dd0a7b3ac67b51ac68758cc7ad0
Author: Tamar Christina <tamar.christina@arm.com>
Date:   Thu Nov 18 11:22:11 2021 +0000

    middle-end: Fix FMA detection when inspecting gimple which have no LHS.

    convert_mult_to_fma assumes that all gimple_assigns have a LHS set.  Th=
is
    assumption is however not true when an IFN is kept around just for the
    side-effects.  In those situations you have just the IFN and lhs will be
null.

    Since there's no LHS, there also can't be any ADD and such it can't be =
an
FMA
    so it's correct to just return early if no LHS.

    gcc/ChangeLog:

            PR tree-optimization/103253
            * tree-ssa-math-opts.c (convert_mult_to_fma): Check for LHS.

    gcc/testsuite/ChangeLog:

            PR tree-optimization/103253
            * gcc.dg/vect/pr103253.c: New test.=