[Bug rtl-optimization/81308] [8 regression] ICE in calc_dfs_tree, at dominance.c:458

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81308

--- Comment #9 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Mon Jan  8 18:20:21 2018
New Revision: 256349

URL: https://gcc.gnu.org/viewcvs?rev=256349&root=gcc&view=rev
Log:
        PR rtl-optimizatin/81308
        * tree-switch-conversion.c (cfg_altered): New file scoped static.
        (process_switch): If group_case_labels makes a change, then set
        cfg_altered.
        (pass_convert_switch::execute): If a switch is converted, then
        set cfg_altered.  Return TODO_cfg_cleanup if cfg_altered is true.

        PR rtl-optimizatin/81308
        * g++.dg/pr81308-1.C: New test.
        * g++.dg/pr81308-2.C: New test.

Added:
    trunk/gcc/testsuite/g++.dg/pr81308-1.C
    trunk/gcc/testsuite/g++.dg/pr81308-2.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-switch-conversion.c