[Bug middle-end/89008] [7/8 Regression] O2 and O1 results differ for simple test

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89008

--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Jan 24 09:31:51 2019
New Revision: 268234

URL: https://gcc.gnu.org/viewcvs?rev=268234&root=gcc&view=rev
Log:
2019-01-24  Richard Biener  <rguent...@suse.de>

        Backport from mainline
        2019-01-23  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/89008
        * tree-ssa-reassoc.c (eliminate_using_constants): For * 0 do
        not leave another stray operand.

        * gcc.dg/torture/pr89008.c: New testcase.

Added:
    branches/gcc-8-branch/gcc/testsuite/gcc.dg/torture/pr89008.c
Modified:
    branches/gcc-8-branch/gcc/ChangeLog
    branches/gcc-8-branch/gcc/testsuite/ChangeLog
    branches/gcc-8-branch/gcc/tree-ssa-reassoc.c