tree-ssa-loop-niter.c (estimate_numbers_of_iterations_loop): Avoid use of…

tree-ssa-loop-niter.c (estimate_numbers_of_iterations_loop): Avoid use of profile unless profile status is PROFILE_READ.


	* tree-ssa-loop-niter.c (estimate_numbers_of_iterations_loop): Avoid
	use of profile unless profile status is PROFILE_READ.
	* profile.c (compute_branch_probabilities): Set profile status
	only after reporting predictor hitrates.

From-SVN: r237076

gcc/ChangeLog

+2016-06-03  Jan Hubicka  <hubicka@ucw.cz>
+
+	* tree-ssa-loop-niter.c (estimate_numbers_of_iterations_loop): Avoid
+	use of profile unless profile status is PROFILE_READ.
+	* profile.c (compute_branch_probabilities): Set profile status
+	only after reporting predictor hitrates.
+
 2016-06-03  Joseph Myers  <joseph@codesourcery.com>
 
 	PR target/71276

gcc/profile.c

@@ -826,8 +826,6 @@ compute_branch_probabilities (unsigned cfg_checksum, unsigned lineno_checksum)
 	}
     }
   counts_to_freqs ();
-  profile_status_for_fn (cfun) = PROFILE_READ;
-  compute_function_frequency ();
 
   if (dump_file)
     {
@@ -1329,8 +1327,13 @@ branch_prob (void)
   values.release ();
   free_edge_list (el);
   coverage_end_function (lineno_checksum, cfg_checksum);
-  if (dump_file && (dump_flags & TDF_DETAILS))
-    report_predictor_hitrates ();
+  if (flag_branch_probabilities && profile_info)
+    {
+      if (dump_file && (dump_flags & TDF_DETAILS))
+	report_predictor_hitrates ();
+      profile_status_for_fn (cfun) = PROFILE_READ;
+      compute_function_frequency ();
+    }
 }
 
 /* Union find algorithm implementation for the basic blocks using

gcc/tree-ssa-loop-niter.c

@@ -3757,10 +3757,12 @@ estimate_numbers_of_iterations_loop (struct loop *loop)
   maybe_lower_iteration_bound (loop);
 
   /* If we have a measured profile, use it to estimate the number of
-     iterations.  */
-  if (loop->header->count != 0)
+     iterations.  Explicitly check for profile status so we do not report
+     wrong prediction hitrates for guessed loop iterations heuristics.  */
+  if (loop->header->count != 0
+      && profile_status_for_fn (cfun) >= PROFILE_READ)
     {
-      gcov_type nit = expected_loop_iterations_unbounded (loop) + 1;
+      gcov_type nit = expected_loop_iterations_unbounded (loop);
       bound = gcov_type_to_wide_int (nit);
       record_niter_bound (loop, bound, true, false);
     }