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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/114375] [11/12/13 Regression] Wrong
 vectorization of permuted mask load
Date: Wed, 08 May 2024 13:38:59 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114375

--- Comment #5 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-13 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:4f2a35a76cca503749c696e7772d2e8eadc77ba5

commit r13-8727-g4f2a35a76cca503749c696e7772d2e8eadc77ba5
Author: Richard Biener <rguenther@suse.de>
Date:   Mon Mar 18 12:39:03 2024 +0100

    tree-optimization/114375 - disallow SLP discovery of permuted mask loads

    We cannot currently handle permutations of mask loads in code generation
    or permute optimization.  But we simply drop any permutation on the
    floor, so the following instead rejects the SLP build rather than
    producing wrong-code.  I've also made sure to reject them in
    vectorizable_load for completeness.

            PR tree-optimization/114375
            * tree-vect-slp.cc (vect_build_slp_tree_2): Compute the
            load permutation for masked loads but reject it when any
            such is necessary.
            * tree-vect-stmts.cc (vectorizable_load): Reject masked
            VMAT_ELEMENTWISE and VMAT_STRIDED_SLP as those are not
            supported.

            * gcc.dg/vect/vect-pr114375.c: New testcase.

    (cherry picked from commit 94c3508c5a14d1948fe3bffa9e16c6f3d9c2836a)=