gcc/gcc ChangeLog tree-ssa-dce.c tree-ssa-pre.c

[steven@gcc.gnu.org]

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	steven@gcc.gnu.org	2005-01-14 18:40:31

Modified files:
	gcc            : ChangeLog tree-ssa-dce.c tree-ssa-pre.c 

Log message:
	* tree-ssa-dce.c (visited_control_parents): New sbitmap to
	replace BB_VISITED uses.
	(find_obviously_necessary_stmts): Don't clear BB_VISITED.
	(propagate_necessity): Check the bitmap instead of BB_VISITED.
	(tree_dce_done): Free visited_control_parents.
	(perform_tree_ssa_dce): Allocate and clear it.
	* tree-ssa-pre.c (compute_antic_aux): Make non-recursive.
	(compute_antic): Iterate from here using a DFS.  Use an sbitmap
	instead of BB_VISITED.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.7125&r2=2.7126
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/tree-ssa-dce.c.diff?cvsroot=gcc&r1=2.29&r2=2.30
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/tree-ssa-pre.c.diff?cvsroot=gcc&r1=2.59&r2=2.60