re PR tree-optimization/86038 (ICE in to_reg_br_prob_base, at profile-count.h:242)

2018-06-04  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/86038
	* tracer.c (find_best_successor): Check probability for
	being initialized, bail out if not.

	* gcc.dg/pr86038.c: New testcase.

From-SVN: r261142

gcc/ChangeLog

+2018-06-04  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/86038
+	* tracer.c (find_best_successor): Check probability for
+	being initialized, bail out if not.
+
 2018-06-04  Richard Earnshaw  <rearnsha@arm.com>
 
 	PR target/86003

gcc/testsuite/ChangeLog

+2018-06-04  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/86038
+	* gcc.dg/pr86038.c: New testcase.
+
 2018-06-04  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/69615

gcc/testsuite/gcc.dg/pr86038.c

+/* { dg-do compile } */
+/* { dg-require-effective-target pthread } */
+/* { dg-options "-O2 -ftracer -ftree-parallelize-loops=2 -fno-tree-scev-cprop --param parloops-schedule=dynamic" } */
+
+int
+sd (int lw)
+{
+  while (lw < 1)
+    ++lw;
+
+  return lw;
+}

gcc/tracer.c

@@ -159,7 +159,8 @@ find_best_successor (basic_block bb)
     }
   if (!best || ignore_bb_p (best->dest))
     return NULL;
-  if (best->probability.to_reg_br_prob_base () <= probability_cutoff)
+  if (!best->probability.initialized_p ()
+      || best->probability.to_reg_br_prob_base () <= probability_cutoff)
     return NULL;
   return best;
 }