re PR tree-optimization/77862 (ice in add_equivalence)

Fix PR77862
gcc/testsuite/ChangeLog:

2016-10-06  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR tree-optimization/77862
	* gcc.dg/pr77862.c: New test.

gcc/ChangeLog:

2016-10-06  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR tree-optimization/77862
	* tree-vrp.c (add_equivalence): Use get_value_range so that
	num_vr_values is checked before accessing vr_values.

From-SVN: r240842

gcc/ChangeLog

 2016-10-06  Kugan Vivekanandarajah  <kuganv@linaro.org>
 
+	PR tree-optimization/77862
+	* tree-vrp.c (add_equivalence): Use get_value_range so that
+	num_vr_values is checked before accessing vr_values.
+
+2016-10-06  Kugan Vivekanandarajah  <kuganv@linaro.org>
+
 	* tree-vrp.c (evrp_dom_walker::before_dom_children): Handle
 	  POINTER_TYPE_P.
 

gcc/testsuite/ChangeLog

 2016-10-06  Kugan Vivekanandarajah  <kuganv@linaro.org>
 
+	PR tree-optimization/77862
+	* gcc.dg/pr77862.c: New test.
+
+2016-10-06  Kugan Vivekanandarajah  <kuganv@linaro.org>
+
 	* gcc.dg/tree-ssa/evrp4.c: New test.
 
 2016-10-06  Jeff Law  <law@redhat.com>

gcc/testsuite/gcc.dg/pr77862.c

+
+/* PR tree-optimization/77862 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -fPIC -w" } */
+
+struct paramed_type
+{
+};
+int a;
+
+int memcmp ( int*, void *, long );
+
+void
+cur_token (void)
+{
+  if ( 1 != a || memcmp ( cur_token, "", a ) )
+    return;
+  struct paramed_type b = { };
+}

gcc/tree-vrp.c

@@ -842,7 +842,7 @@ static void
 add_equivalence (bitmap *equiv, const_tree var)
 {
   unsigned ver = SSA_NAME_VERSION (var);
-  value_range *vr = vr_value[ver];
+  value_range *vr = get_value_range (var);
 
   if (*equiv == NULL)
     *equiv = BITMAP_ALLOC (&vrp_equiv_obstack);