[Bug tree-optimization/93945] [9/10 Regression] memset of non-zero constant followed by bitfield read big-endian miscompilation since r9-547

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93945

--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Jakub Jelinek
<jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:a460bf38dc3582ce1f559cc84084ca27e429b34c

commit r9-8299-ga460bf38dc3582ce1f559cc84084ca27e429b34c
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Thu Feb 27 11:21:52 2020 +0100

    sccvn: Punt on ref->size not multiple of 8 for memset (, 123, ) in 9.x
[PR93945]

    And here is the corresponding 9.x change where we the patch just punts if
    ref->size is not whole bytes, like we already punt if offseti is not byte
    aligned.

    2020-02-27  Jakub Jelinek  <jakub@redhat.com>

        PR tree-optimization/93945
        * tree-ssa-sccvn.c (vn_reference_lookup_3): For memset with non-zero
        second operand, require ref->size to be a multiple of BITS_PER_UNIT.

        * gcc.c-torture/execute/pr93945.c: New test.