loop-unswitch.c (unswitch_loop): Pass probabilities to loopify.

	* loop-unswitch.c (unswitch_loop): Pass probabilities to loopify.
	* tree-ssa-loop-unswitch.c (tree_unswitch_loop): Pass probabilities
	to loop_version.
	* cfgloopmanip.c (scale_loop_frequencies): Export.
	(loopify): Scale the frequencies by prescribed coefficients.
	(set_zero_probability): New function.
	(duplicate_loop_to_header_edge): Improve updating of frequencies.
	(lv_adjust_loop_entry_edge, loop_version): Set probabilities
	and frequencies according to arguments.
	* tree-ssa-loop-manip.c (tree_unroll_loop): Set probabilities
	correctly.
	* cfg.c (scale_bbs_frequencies_int): Allow scaling the frequencies up.
	* modulo-sched.c (sms_schedule): Set probabilities for entering
	versioned loop correctly.
	* tree-vect-transform.c (vect_transform_loop): Ditto.
	* cfgloop.h (loopify, loop_version): Declaration changed.
	(scale_loop_frequencies): Declared.

	* gcc.dg/tree-ssa/update-unroll-1.c: New test.
	* gcc.dg/tree-ssa/update-unswitch-1.c: New test.

From-SVN: r120378

1 files changed, 6 insertions, 2 deletions

diff --git a/gcc/tree-ssa-loop-unswitch.c b/gcc/tree-ssa-loop-unswitch.c
index 52465db..7a329c9 100644
--- a/gcc/tree-ssa-loop-unswitch.c
+++ b/gcc/tree-ssa-loop-unswitch.c
@@ -269,13 +269,17 @@ static struct loop *
 tree_unswitch_loop (struct loop *loop,
 		    basic_block unswitch_on, tree cond)
 {
-  basic_block condition_bb;
+  unsigned prob_true;
+  edge edge_true, edge_false;
 
   /* Some sanity checking.  */
   gcc_assert (flow_bb_inside_loop_p (loop, unswitch_on));
   gcc_assert (EDGE_COUNT (unswitch_on->succs) == 2);
   gcc_assert (loop->inner == NULL);
 
+  extract_true_false_edges_from_block (unswitch_on, &edge_true, &edge_false);
+  prob_true = edge_true->probability;
   return loop_version (loop, unshare_expr (cond), 
-		       &condition_bb, false);
+		       NULL, prob_true, prob_true,
+		       REG_BR_PROB_BASE - prob_true, false);
 }