[Bug tree-optimization/87700] [8/9 Regression] Compile time hog w/ -O1

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87700

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Oct 23 09:35:31 2018
New Revision: 265417

URL: https://gcc.gnu.org/viewcvs?rev=265417&root=gcc&view=rev
Log:
2018-10-23  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/87700
        * tree-ssa-copy.c (set_copy_of_val): Fix change detection logic.

        * gcc.dg/torture/pr87700.c: New testcase.

Added:
    branches/gcc-8-branch/gcc/testsuite/gcc.dg/torture/pr87700.c
Modified:
    branches/gcc-8-branch/gcc/ChangeLog
    branches/gcc-8-branch/gcc/testsuite/ChangeLog
    branches/gcc-8-branch/gcc/tree-ssa-copy.c