re PR target/43920 (Choosing conditional execution over conditional branches for code size in some cases.)

2011-04-07  Tom de Vries  <tom@codesourcery.com>

	PR target/43920
	* cfgcleanup.c (equal_different_set_p, can_replace_by, merge_dir): New
	function.
	(old_insns_match_p): Change return type.  Replace return false/true with
	return dir_none/dir_both.  Use can_replace_by.
	(flow_find_cross_jump): Add dir_p parameter.  Init replacement direction
	from dir_p.  Register replacement direction in dir, last_dir and
	afterlast_dir.	Handle new return type of old_insns_match_p using
	merge_dir.  Return replacement direction in dir_p.
	(flow_find_head_matching_sequence, outgoing_edges_match): Handle new
	return type of old_insns_match_p.
	(try_crossjump_to_edge): Add argument to call to flow_find_cross_jump.
	* ifcvt.c ( cond_exec_process_if_block): Add argument to call to
	flow_find_cross_jump.
	* basic-block.h (enum replace_direction): New type.
	(flow_find_cross_jump): Add parameter to declaration.

From-SVN: r172090