[Bug tree-optimization/91180] [10 Regression] wrong code at -O and above with __builtin_memset()

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91180

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Jul 17 09:35:04 2019
New Revision: 273548

URL: https://gcc.gnu.org/viewcvs?rev=273548&root=gcc&view=rev
Log:
2019-07-17  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/91180
        * tree-ssa-sccvn.c (vn_reference_lookup_3): Fix offset
        computation for memset partial defs.

        * gcc.dg/torture/pr91180.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr91180.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-sccvn.c