basic-block.h (scale_bbs_frequencies_int, [...]): Declare.

	* basic-block.h (scale_bbs_frequencies_int,
	scale_bbs_frequencies_gcov_type): Declare.
	* cfg.c (RDIV): New macro.
	(update_bb_frequency_for_threading): Fix.
	* basic-block.h (scale_bbs_frequencies_int,
	scale_bbs_frequencies_gcov_type): New.
	* cfgloopmanip.c (scale_bbs_frequencies): Kill.
	(scale_loop_frequencies, duplicate_loop_to_header_edge): Use
	scale_bbs_frequencies_int.
	* tree-ssa-loop-ch.c (copy_loop_headers): Fix profiling info.

Co-Authored-By: Dale Johannesen <dalej@apple.com>

From-SVN: r96700

1 files changed, 41 insertions, 2 deletions

diff --git a/gcc/cfg.c b/gcc/cfg.c
index 03f1ee1..c0e38f2 100644
--- a/gcc/cfg.c
+++ b/gcc/cfg.c
@@ -96,6 +96,8 @@ static void free_edge (edge);
 /* Indicate the presence of the profile.  */
 enum profile_status profile_status;
 
+#define RDIV(X,Y) (((X) + (Y) / 2) / (Y))
+
 /* Called once at initialization time.  */
 
 void
@@ -933,10 +935,10 @@ update_bb_profile_for_threading (basic_block bb, int edge_frequency,
     }
   else if (prob != REG_BR_PROB_BASE)
     {
-      int scale = REG_BR_PROB_BASE / prob;
+      int scale = 65536 * REG_BR_PROB_BASE / prob;
 
       FOR_EACH_EDGE (c, ei, bb->succs)
-	c->probability *= scale;
+	c->probability *= scale / 65536;
     }
 
   if (bb != taken_edge->src)
@@ -945,3 +947,40 @@ update_bb_profile_for_threading (basic_block bb, int edge_frequency,
   if (taken_edge->count < 0)
     taken_edge->count = 0;
 }
+
+/* Multiply all frequencies of basic blocks in array BBS of length NBBS
+   by NUM/DEN, in int arithmetic.  May lose some accuracy.  */
+void
+scale_bbs_frequencies_int (basic_block *bbs, int nbbs, int num, int den)
+{
+  int i;
+  edge e;
+  for (i = 0; i < nbbs; i++)
+    {
+      edge_iterator ei;
+      bbs[i]->frequency = (bbs[i]->frequency * num) / den;
+      bbs[i]->count = RDIV (bbs[i]->count * num, den);
+      FOR_EACH_EDGE (e, ei, bbs[i]->succs)
+	e->count = (e->count * num) /den;
+    }
+}
+
+/* Multiply all frequencies of basic blocks in array BBS of length NBBS
+   by NUM/DEN, in gcov_type arithmetic.  More accurate than previous
+   function but considerably slower.  */
+void
+scale_bbs_frequencies_gcov_type (basic_block *bbs, int nbbs, gcov_type num, 
+			         gcov_type den)
+{
+  int i;
+  edge e;
+
+  for (i = 0; i < nbbs; i++)
+    {
+      edge_iterator ei;
+      bbs[i]->frequency = (bbs[i]->frequency * num) / den;
+      bbs[i]->count = RDIV (bbs[i]->count * num, den);
+      FOR_EACH_EDGE (e, ei, bbs[i]->succs)
+	e->count = (e->count * num) /den;
+    }
+}