[Bug tree-optimization/93538] [8/9/10 Regression] equality of address of first member to address to enclosing object not folded

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93538

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Guenther <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:5124c34fcc62f0f880ae947542678e28aa2ce703

commit r10-6433-g5124c34fcc62f0f880ae947542678e28aa2ce703
Author: Richard Biener <rguenther@suse.de>
Date:   Tue Feb 4 15:17:01 2020 +0100

    tree-optimization/93538 - add missing comparison folding case

    This adds back a folding that worked in GCC 4.5 times by amending
    the pattern that handles other cases of address vs. SSA name
    comparisons.

    2020-02-04  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/93538
        * match.pd (addr EQ/NE ptr): Amend to handle &ptr->x EQ/NE ptr.

        * gcc.dg/tree-ssa/forwprop-38.c: New testcase.