coverage.c (get_coverage_counts): Give a different message if flag_guess_branch_prob is set.

	* coverage.c (get_coverage_counts): Give a different message
	if flag_guess_branch_prob is set.
	* predict.c (counts_to_freqs): Return an int.
	(estimate_bb_frequencies): If counts_to_freqs returns zero,
	calculate estimates.

From-SVN: r76741

gcc/ChangeLog

+2004-01-27  J"orn Rennecke <joern.rennecke@superh.com>
+
+	* coverage.c (get_coverage_counts): Give a different message
+	if flag_guess_branch_prob is set.
+	* predict.c (counts_to_freqs): Return an int.
+	(estimate_bb_frequencies): If counts_to_freqs returns zero,
+	calculate estimates.
+
 2004-01-27  Kazu Hirata  <kazu@cs.umass.edu>
 
 	* config/iq2000/iq2000-protos.h: Remove the prototype for

gcc/coverage.c

@@ -316,7 +316,9 @@ get_coverage_counts (unsigned counter, unsigned expected,
       static int warned = 0;
 
       if (!warned++)
-	inform ("file %s not found, execution counts assumed to be zero",
+	inform ((flag_guess_branch_prob
+		 ? "file %s not found, execution counts estimated"
+		 : "file %s not found, execution counts assumed to be zero"),
 		da_file_name);
       return NULL;
     }

gcc/predict.c

@@ -71,7 +71,7 @@ static void dump_prediction (enum br_predictor, int, basic_block, int);
 static void estimate_loops_at_level (struct loop *loop);
 static void propagate_freq (struct loop *);
 static void estimate_bb_frequencies (struct loops *);
-static void counts_to_freqs (void);
+static int counts_to_freqs (void);
 static void process_note_predictions (basic_block, int *);
 static void process_note_prediction (basic_block, int *, int, int);
 static bool last_basic_block_p (basic_block);
@@ -1048,19 +1048,22 @@ estimate_loops_at_level (struct loop *first_loop)
     }
 }
 
-/* Convert counts measured by profile driven feedback to frequencies.  */
+/* Convert counts measured by profile driven feedback to frequencies.
+   Return nonzero iff there was any nonzero execution count.  */
 
-static void
+static int
 counts_to_freqs (void)
 {
-  gcov_type count_max = 1;
+  gcov_type count_max, true_count_max = 0;
   basic_block bb;
 
   FOR_EACH_BB (bb)
-    count_max = MAX (bb->count, count_max);
+    true_count_max = MAX (bb->count, true_count_max);
 
+  count_max = MAX (true_count_max, 1);
   FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
     bb->frequency = (bb->count * BB_FREQ_MAX + count_max / 2) / count_max;
+  return true_count_max;
 }
 
 /* Return true if function is likely to be expensive, so there is no point to
@@ -1113,9 +1116,7 @@ estimate_bb_frequencies (struct loops *loops)
   basic_block bb;
   sreal freq_max;
 
-  if (flag_branch_probabilities)
-    counts_to_freqs ();
-  else
+  if (!flag_branch_probabilities || !counts_to_freqs ())
     {
       static int real_values_initialized = 0;