From: law <law@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Sun, 21 Nov 2004 20:41:37 +0000 (+0000)
Subject:         * cfg.c (update_bb_profile_for_threading): Do not rescale the
X-Git-Tag: upstream/4.9.2~65809
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=2260bbe16dcf862ea9d372108e58055b035315ce;p=platform%2Fupstream%2Flinaro-gcc.git

    * cfg.c (update_bb_profile_for_threading): Do not rescale the
        successor probabilities if they are not going to change.  Pull
        division out of loop if we do need to rescale successor probabilities.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@90987 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index b4f0c52..5c8f32e 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,9 @@
 2004-11-21  Jeff Law  <law@redhat.com>
 
+	* cfg.c (update_bb_profile_for_threading): Do not rescale the
+	successor probabilities if they are not going to change.  Pull
+	division out of loop if we do need to rescale successor probabilities.
+
 	* tree-ssa-threadupdate.c (redirection_data_hash): Use the
 	index of the destination block for the hash value rather than
 	hashing a pointer.
diff --git a/gcc/cfg.c b/gcc/cfg.c
index 67b0598..b008bad 100644
--- a/gcc/cfg.c
+++ b/gcc/cfg.c
@@ -941,9 +941,13 @@ update_bb_profile_for_threading (basic_block bb, int edge_frequency,
       for (; (c = ei_safe_edge (ei)); ei_next (&ei))
 	c->probability = 0;
     }
-  else
-    FOR_EACH_EDGE (c, ei, bb->succs)
-      c->probability = ((c->probability * REG_BR_PROB_BASE) / (double) prob);
+  else if (prob != REG_BR_PROB_BASE)
+    {
+      int scale = REG_BR_PROB_BASE / prob;
+
+      FOR_EACH_EDGE (c, ei, bb->succs)
+	c->probability *= scale;
+    }
 
   if (bb != taken_edge->src)
     abort ();