[Bug tree-optimization/15256] [tree-ssa] Optimize manual bitfield manipilation.

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15256

--- Comment #5 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-05-11 
14:13:47 UTC ---
Author: rguenth
Date: Wed May 11 14:13:38 2011
New Revision: 173659

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=173659
Log:
2011-05-11  Richard Guenther  <rguent...@suse.de>

    PR tree-optimization/15256
    * tree-ssa-forwprop.c (simplify_bitwise_binary): Canonicalize
    (A & B) | C, combine (A op CST1) op CST2.
    (tree_ssa_forward_propagate_single_use_vars): Only bother to
    visit assigns that have uses.

    * gcc.dg/tree-ssa/forwprop-14.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/forwprop-14.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-forwprop.c