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Subject: [Bug middle-end/106331] [10/11/12 Regression] Whole array assignment
 of empty string segfaults with -Og since r12-2633-ge5e164effa30fd2b
Date: Tue, 19 Jul 2022 11:38:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106331

--- Comment #11 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:1a7200da71550e6f92da66f0b328bb20d3bcdf35

commit r12-8584-g1a7200da71550e6f92da66f0b328bb20d3bcdf35
Author: Richard Biener <rguenther@suse.de>
Date:   Tue Jul 19 09:57:22 2022 +0200

    middle-end/106331 - fix mem attributes for string op arguments

    get_memory_rtx tries hard to come up with a MEM_EXPR to record
    in the memory attributes but in the last fallback fails to properly
    account for an unknown offset and thus, as visible in this testcase,
    incorrect alignment computed from set_mem_attributes.  The following
    rectifies both parts.

            PR middle-end/106331
            * builtins.cc (get_memory_rtx): Compute alignment from
            the original address and set MEM_OFFSET to unknown when
            we create a MEM_EXPR from the base object of the address.

            * gfortran.dg/pr106331.f90: New testcase.

    (cherry picked from commit e4ff11a8f2e80adb8ada69bf35ee6a1ab18a9c85)=