[Bug tree-optimization/81162] [8 Regression] UBSAN switch triggers incorrect optimization in SLSR

[wschmidt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81162

--- Comment #15 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Author: wschmidt
Date: Tue Jul 25 19:42:36 2017
New Revision: 250543

URL: https://gcc.gnu.org/viewcvs?rev=250543&root=gcc&view=rev
Log:
[gcc]

2016-07-25  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

        Backport from mainline
        2016-07-14  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

        PR tree-optimization/81162
        * gimple-ssa-strength-reduction.c (replace_mult_candidate): Don't
        replace a negate with an add.

[gcc/testsuite]

2016-07-25  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

        Backport from mainline
        2016-07-14  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

        PR tree-optimization/81162
        * gcc.dg/ubsan/pr81162.c: New file.


Added:
    branches/gcc-6-branch/gcc/testsuite/gcc.dg/ubsan/pr81162.c
Modified:
    branches/gcc-6-branch/gcc/ChangeLog
    branches/gcc-6-branch/gcc/gimple-ssa-strength-reduction.c
    branches/gcc-6-branch/gcc/testsuite/ChangeLog