cfg.c (update_bb_profile_for_threading): Fix profile updating.

	* cfg.c (update_bb_profile_for_threading): Fix profile updating.
	(scale_bbs_frequencies_int): Watch roundoff errors.
	* predict.c (return_prediction): Initialize return_stmt.

From-SVN: r102087

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 25cc46d351daee1675b9c6315394e71b3696e759..de6bad93aff0181c8cfe6596486d0e574332aa8d 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2005-07-16  Jan Hubicka  <jh@suse.cz>
+
+       * cfg.c (update_bb_profile_for_threading): Fix profile updating.
+       (scale_bbs_frequencies_int): Watch roundoff errors.
+       * predict.c (return_prediction): Initialize return_stmt.
+
 2005-07-16  Jan Hubicka  <jh@suse.cz>
 
        * profile.c (rest_of_handle_branch_prob): Fix handling of estimation

diff --git a/gcc/cfg.c b/gcc/cfg.c
index 6aeb79417f992b323725ceacafd45b2294b70a79..e6af6cfbaff535fdb60d9b09efb7c39249507fa5 100644 (file)
--- a/gcc/cfg.c
+++ b/gcc/cfg.c
@@ -896,7 +896,11 @@ update_bb_profile_for_threading (basic_block bb, int edge_frequency,
       int scale = 65536 * REG_BR_PROB_BASE / prob;
 
       FOR_EACH_EDGE (c, ei, bb->succs)
-       c->probability = (c->probability * scale) / 65536;
+       {
+         c->probability = (c->probability * scale) / 65536;
+         if (c->probability > REG_BR_PROB_BASE)
+           c->probability = REG_BR_PROB_BASE;
+       }
     }
 
   gcc_assert (bb == taken_edge->src);
@@ -917,6 +921,10 @@ scale_bbs_frequencies_int (basic_block *bbs, int nbbs, int num, int den)
 {
   int i;
   edge e;
+  if (num < 0)
+    num = 0;
+  if (num > den)
+    return;
   for (i = 0; i < nbbs; i++)
     {
       edge_iterator ei;

diff --git a/gcc/predict.c b/gcc/predict.c
index 305ada6c4f2f393843a6dea4738239ed5a27e85f..a448c0449b88445296b4906e35473a2d273bf181 100644 (file)
--- a/gcc/predict.c
+++ b/gcc/predict.c
@@ -1206,7 +1206,7 @@ return_prediction (tree val, enum prediction *prediction)
 static void
 apply_return_prediction (int *heads)
 {
-  tree return_stmt;
+  tree return_stmt = NULL;
   tree return_val;
   edge e;
   tree phi;