[Bug tree-optimization/23821] [4.3/4.4/4.5 Regression] DOM and VRP creating harder to optimize code

[rguenth at gcc dot gnu dot org]

------- Comment #30 from rguenth at gcc dot gnu dot org  2009-10-05 13:18 -------
Subject: Bug 23821

Author: rguenth
Date: Mon Oct  5 13:18:09 2009
New Revision: 152449

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=152449
Log:
2009-10-05  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/23821
        * tree-vrp.c (vrp_finalize): Do not perform copy propagation.
        * tree-ssa-dom.c (cprop_operand): Do not propagate copies into
        simple IV increments.

        * gcc.dg/torture/pr23821.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr23821.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-dom.c
    trunk/gcc/tree-vrp.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23821