re PR tree-optimization/83418 (ICE in…

re PR tree-optimization/83418 (ICE in extract_range_for_var_from_comparison_expr, at vr-values.c:448)

2017-12-14  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/83418
	* vr-values.c (vr_values::extract_range_for_var_from_comparison_expr):
	Instead of asserting we don't get unfolded comparisons deal with
	them.

	* gcc.dg/torture/pr83418.c: New testcase.

From-SVN: r255628

gcc/ChangeLog

+2017-12-14  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/83418
+	* vr-values.c (vr_values::extract_range_for_var_from_comparison_expr):
+	Instead of asserting we don't get unfolded comparisons deal with
+	them.
+
 2017-12-14  Jakub Jelinek  <jakub@redhat.com>
 
 	PR bootstrap/83396

gcc/testsuite/ChangeLog

+2017-12-14  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/83418
+	* gcc.dg/torture/pr83418.c: New testcase.
+
 2017-12-14  Jakub Jelinek  <jakub@redhat.com>
 
 	PR bootstrap/83396

gcc/testsuite/gcc.dg/torture/pr83418.c

+/* { dg-do compile } */
+
+void
+yj (int j4)
+{
+  int t3;
+
+  for (t3 = 0; t3 < 6; ++t3)
+    {
+      short int v4 = t3;
+
+      if (v4 == j4 || v4 > t3)
+	for (;;)
+	  {
+	  }
+    }
+}

gcc/vr-values.c

@@ -445,11 +445,12 @@ vr_values::extract_range_for_var_from_comparison_expr (tree var,
   tree  min, max, type;
   value_range *limit_vr;
   type = TREE_TYPE (var);
-  gcc_assert (limit != var);
 
   /* For pointer arithmetic, we only keep track of pointer equality
-     and inequality.  */
-  if (POINTER_TYPE_P (type) && cond_code != NE_EXPR && cond_code != EQ_EXPR)
+     and inequality.  If we arrive here with unfolded conditions like
+     _1 > _1 do not derive anything.  */
+  if ((POINTER_TYPE_P (type) && cond_code != NE_EXPR && cond_code != EQ_EXPR)
+      || limit == var)
     {
       set_value_range_to_varying (vr_p);
       return;