[Bug tree-optimization/82320] [8 Regression] Compile time hog w/ -O

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82320

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Sep 26 07:29:51 2017
New Revision: 253188

URL: https://gcc.gnu.org/viewcvs?rev=253188&root=gcc&view=rev
Log:
2017-09-26  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/82320
        * tree-ssa-sccvn.c (set_ssa_val_to): Changing undef to undef
        isn't a change.

        * gcc.dg/torture/pr82320.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr82320.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-sccvn.c

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.