gcc/gcc ChangeLog.tree-ssa tree-cfg.c

[law@gcc.gnu.org]

CVSROOT:	/cvs/gcc
Module name:	gcc
Branch: 	tree-ssa-20020619-branch
Changes by:	law@gcc.gnu.org	2003-10-30 21:39:58

Modified files:
	gcc            : ChangeLog.tree-ssa tree-cfg.c 

Log message:
	* tree-cfg.c (thread_jumps): Now returns a bool.  Move some tests into
	tree_forwarder_block_p.  Improve comments.
	(cleanup_control_flow): Now returns a bool indicating if anything was
	changed.
	(thread_unconditional_jumps): Kill.
	(cleanup_tree_cfg): Repeat cascading cleanups until nothing changes.
	(tree_forwarder_block_p): Check forwardable bit in the block's
	annotation to avoid useless work.  Mark blocks as not forwardable as
	appropriate.  Verify destination is not the exit block here.  Do not
	consider successors of the entry block as forwarders.  Ignore empty
	statements when walking through the block's statements.  Verify target
	block is not the start of a case label and that we can safely insert
	a label at the target block.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.tree-ssa.diff?cvsroot=gcc&only_with_tag=tree-ssa-20020619-branch&r1=1.1.2.793&r2=1.1.2.794
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/tree-cfg.c.diff?cvsroot=gcc&only_with_tag=tree-ssa-20020619-branch&r1=1.1.4.186&r2=1.1.4.187