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Subject: [Bug tree-optimization/102046] [12 Regression] ICE: tree check:
 expected class 'type', have 'exceptional' (error_mark) in
 useless_type_conversion_p, at gimple-expr.c:87 with -O3 -march=btver2 since
 r12-1372-ga325bdd195ee96f8
Date: Wed, 25 Aug 2021 09:32:16 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102046

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:29c77454e5ab33ce06a741eacdfbd5348fbccc95

commit r12-3138-g29c77454e5ab33ce06a741eacdfbd5348fbccc95
Author: Richard Biener <rguenther@suse.de>
Date:   Wed Aug 25 10:06:01 2021 +0200

    tree-optimization/102046 - fix SLP build from scalars with patterns

    When we swap operands for SLP builds we lose track where exactly
    pattern defs are - but we fail to update the any_pattern member
    of the operands info.  Do so conservatively.

    2021-08-25  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/102046
            * tree-vect-slp.c (vect_build_slp_tree_2): Conservatively
            update ->any_pattern when swapping operands.

            * gcc.dg/vect/pr102046.c: New testcase.=