[Bug debug/80025] [5/6/7 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 #14 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Fri Mar 31 06:05:47 2017
New Revision: 246606

URL: https://gcc.gnu.org/viewcvs?rev=246606&root=gcc&view=rev
Log:
        PR debug/80025
        * cselib.h (rtx_equal_for_cselib_1): Add depth argument.
        (rtx_equal_for_cselib_p): Pass 0 to it.
        * cselib.c (cselib_hasher::equal): Likewise.
        (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:
    trunk/gcc/testsuite/gcc.dg/torture/pr80025.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/cselib.c
    trunk/gcc/cselib.h
    trunk/gcc/testsuite/ChangeLog