re PR tree-optimization/65875 (ICE: Segmentation fault)

	PR tree-optimization/65875
	* tree-vrp.c (update_value_range): If in is_new case setting
	old_vr to VR_VARYING, also set new_vr to it.  Remove
	old_vr->type == VR_VARYING test.
	(vrp_visit_phi_node): Return SSA_PROP_VARYING instead of
	SSA_PROP_INTERESTING if update_value_range returned true,
	but new range is VR_VARYING.

	* gcc.c-torture/compile/pr65875.c: New test.

From-SVN: r222458

gcc/ChangeLog

+2015-04-27  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/65875
+	* tree-vrp.c (update_value_range): If in is_new case setting
+	old_vr to VR_VARYING, also set new_vr to it.  Remove
+	old_vr->type == VR_VARYING test.
+	(vrp_visit_phi_node): Return SSA_PROP_VARYING instead of
+	SSA_PROP_INTERESTING if update_value_range returned true,
+	but new range is VR_VARYING.
+
 2015-04-27  Thomas Preud'homme  <thomas.preudhomme@arm.com>
 
 	* combine.c (sign_extend_short_imm): New.

gcc/testsuite/ChangeLog

+2015-04-27  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/65875
+	* gcc.c-torture/compile/pr65875.c: New test.
+
 2015-04-25  Marek Polacek  <polacek@redhat.com>
 
 	PR c/52085

gcc/testsuite/gcc.c-torture/compile/pr65875.c

+/* PR tree-optimization/65875 */
+
+int a, b, c, d, e, f, g;
+
+void
+foo (void)
+{
+  long h = 0, i;
+  if (g < 0)
+    i = -g;
+  for (; b;)
+    for (; c;)
+      if (e)
+	h = 1;
+  for (; f;)
+    if (a)
+      break;
+  if (h > i)
+    while (h > i)
+      {
+	d = 0;
+	h--;
+      }
+}

gcc/tree-vrp.c

@@ -886,13 +886,18 @@ update_value_range (const_tree var, value_range_t *new_vr)
   if (is_new)
     {
       /* Do not allow transitions up the lattice.  The following
-         is slightly more awkward than just new_vr->type < old_vr->type
+	 is slightly more awkward than just new_vr->type < old_vr->type
 	 because VR_RANGE and VR_ANTI_RANGE need to be considered
 	 the same.  We may not have is_new when transitioning to
-	 UNDEFINED or from VARYING.  */
-      if (new_vr->type == VR_UNDEFINED
-	  || old_vr->type == VR_VARYING)
-	set_value_range_to_varying (old_vr);
+	 UNDEFINED.  If old_vr->type is VARYING, we shouldn't be
+	 called.  */
+      if (new_vr->type == VR_UNDEFINED)
+	{
+	  BITMAP_FREE (new_vr->equiv);
+	  set_value_range_to_varying (old_vr);
+	  set_value_range_to_varying (new_vr);
+	  return true;
+	}
       else
 	set_value_range (old_vr, new_vr->type, new_vr->min, new_vr->max,
 			 new_vr->equiv);
@@ -8941,6 +8946,9 @@ update_range:
 	  fprintf (dump_file, "\n");
 	}
 
+      if (vr_result.type == VR_VARYING)
+	return SSA_PROP_VARYING;
+
       return SSA_PROP_INTERESTING;
     }