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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/107451] [11/12 Regression] Segmentation fault
 with vectorized code since r11-6434
Date: Wed, 15 Mar 2023 09:47:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107451

--- Comment #13 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-12 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:c722c6b061a5e909267eae53ffe5910fbe0a7d5e

commit r12-9255-gc722c6b061a5e909267eae53ffe5910fbe0a7d5e
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Dec 22 09:36:17 2022 +0100

    tree-optimization/107451 - SLP load vectorization issue

    When vectorizing SLP loads with permutations we can access excess
    elements when the load vector type is bigger than the group size
    and the vectorization factor covers less groups than necessary
    to fill it.  Since we know the code will only access up to
    group_size * VF elements in the unpermuted vector we can simply
    fill the rest of the vector with whatever we want.  For simplicity
    this patch chooses to repeat the last group.

            PR tree-optimization/107451
            * tree-vect-stmts.cc (vectorizable_load): Avoid loading
            SLP group members from group numbers in excess of the
            vectorization factor.

            * gcc.dg/torture/pr107451.c: New testcase.

    (cherry picked from commit 7b2cf5041460859ca4f58e5da1308b7ef9129d8b)=