[Bug tree-optimization/46590] [4.6/4.7/4.8 Regression] long compile time with -O2 and many loops

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46590

--- Comment #37 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-09-05 
13:29:20 UTC ---
Author: rguenth
Date: Wed Sep  5 13:29:13 2012
New Revision: 190978

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=190978
Log:
2012-09-05  Richard Guenther  <rguent...@suse.de>

    PR tree-optimization/46590
    * tree-ssa-loop-ivcanon.c (try_unroll_loop_completely): Do not
    update SSA form here.
    (canonicalize_induction_variables): Assert we do not need to
    update SSA form.
    (tree_unroll_loops_completely): Update SSA form here.
    * tree-ssa-loop-manip.c (gimple_duplicate_loop_to_header_edge):
    Do not verify loop-closed SSA form if SSA form is not up-to-date.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-ssa-loop-ivcanon.c
    trunk/gcc/tree-ssa-loop-manip.c