[Bug tree-optimization/92262] [10 Regression] ICE: verify_gimple failed (error: incorrect sharing of tree nodes)

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92262

--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed Oct 30 09:52:01 2019
New Revision: 277605

URL: https://gcc.gnu.org/viewcvs?rev=277605&root=gcc&view=rev
Log:
        PR tree-optimization/92262
        * tree-ssa-loop-ivopts.c (get_debug_computation_at): Don't unshare
        ubase or cbase here.
        (remove_unused_ivs): Unshare comp before using it.

        * g++.dg/opt/pr92262.C: New test.

Added:
    trunk/gcc/testsuite/g++.dg/opt/pr92262.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-loop-ivopts.c