[Bug debug/80025] [5/6 Regression] ICE w/ -O2 (-O3, -Ofast) -g -ftracer (infinite recursion in rtx_equal_for_cselib_1)

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80025

--- Comment #17 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue May 30 08:22:41 2017
New Revision: 248667

URL: https://gcc.gnu.org/viewcvs?rev=248667&root=gcc&view=rev
Log:
        Backported from mainline
        2017-03-31  Jakub Jelinek  <jakub@redhat.com>

        PR debug/80025
        * cselib.c (cselib_hasher::equal): Pass 0 to rtx_equal_for_cselib_1.
        (rtx_equal_for_cselib_1): Add depth argument.  If depth
        is 128, don't look up VALUE locs and punt.  Increment
        depth in recursive calls when walking VALUE locs.

        * gcc.dg/torture/pr80025.c: New test.

Added:
    branches/gcc-5-branch/gcc/testsuite/gcc.dg/torture/pr80025.c
Modified:
    branches/gcc-5-branch/gcc/ChangeLog
    branches/gcc-5-branch/gcc/cselib.c
    branches/gcc-5-branch/gcc/testsuite/ChangeLog