[Bug tree-optimization/91108] [8/9/10 Regression] Fails to pun through unions

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91108

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Jul  8 11:46:26 2019
New Revision: 273232

URL: https://gcc.gnu.org/viewcvs?rev=273232&root=gcc&view=rev
Log:
2019-07-08  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/91108
        * tree-ssa-sccvn.c: Include builtins.h.
        (vn_reference_lookup_3): Use only alignment constraints to
        verify same-valued store disambiguation.

        * gcc.dg/tree-ssa/ssa-fre-61.c: Adjust back.
        * gcc.dg/tree-ssa/ssa-fre-78.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-78.c
Modified:
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-61.c
    trunk/gcc/tree-ssa-sccvn.c