[Bug tree-optimization/69347] [6 regression] excessive compile time with -O2

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69347

--- Comment #14 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Thu Jan 21 22:21:55 2016
New Revision: 232711

URL: https://gcc.gnu.org/viewcvs?rev=232711&root=gcc&view=rev
Log:
[PATCH] [PR tree-optimization/69347] Fix memory consumption in threader & minor
speed improvement

        PR middle-end/69347
        * tree-ssa-dom.c (dom_opt_dom_walker::thread_across_edge): Avoid
        useless call to record_temporary_equivalences.
        * tree-ssa-threadbackward.c (find_jump_threads_backwards): Just
        allocate 10 slots in the bb_path vector and let it grow as needed.
        (fsm_find_control_statement_thread_paths): Similarly for the next_path
        vector.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-ssa-dom.c
    trunk/gcc/tree-ssa-threadbackward.c