[Bug tree-optimization/94598] [10 Regression] ICE in verify_sra_access_forest, at tree-sra.c:2360 with -O1 or higher since r10-6321-g636e80eea24b780f

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94598

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

https://gcc.gnu.org/g:bd87b1fddbbe7d424671ebf81c96e12d748fafc7

commit r10-7751-gbd87b1fddbbe7d424671ebf81c96e12d748fafc7
Author: Martin Jambor <mjambor@suse.cz>
Date:   Thu Apr 16 11:04:41 2020 +0200

    sra: Fix access verification (PR 94598)

    get_ref_base_and_extent recognizes ARRAY_REFs with variable index but
    into arrays of length one as constant offset accesses.  However,
    max_size in such cases is extended to span the whole element.  This
    confuses SRA verification when SRA also builds its (total
    scalarization) access structures to describe fields under such array -
    get_ref_base_and_extent returns different size and max_size for them.

    Fixed by not performing the check for total scalarization accesses.
    The subsequent check then had to be changed to use size and not
    max_size too, which meant it has to be skipped when the access
    structure describes a genuine variable array access.

    Bootstrapped and tested on x86_64-linux.

    2020-04-16  Martin Jambor  <mjambor@suse.cz>

            PR tree-optimization/94598
            * tree-sra.c (verify_sra_access_forest): Fix verification of total
            scalarization accesses under access to one-element arrays.

            testsuite/
            * gcc.dg/tree-ssa/pr94598.c: New test.