r144125 - in /branches/alias-improvements/gcc: ...

[rguenth@gcc.gnu.org]

Author: rguenth
Date: Thu Feb 12 13:38:12 2009
New Revision: 144125

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=144125
Log:
2009-02-12  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-alias.c (walk_aliased_vdefs): Get visited bitmap.
	Only free it if we didn't get one.
	* tree-ssa-alias.h (walk_aliased_vdefs): Adjust prototype.
	* tree-ssa-dce.c (mark_nonaliased_loads_necessary): Pass NULL
	for the bitmap argument to walk_aliased_vdefs.
	(mark_aliased_loads_necessary): Pass locally cached bitmap.
	(visited): New global static.
	(perform_tree_ssa_dce): Free visited bitmap after propagating
	necessity.

Modified:
    branches/alias-improvements/gcc/ChangeLog.alias
    branches/alias-improvements/gcc/tree-ssa-alias.c
    branches/alias-improvements/gcc/tree-ssa-alias.h
    branches/alias-improvements/gcc/tree-ssa-dce.c