re PR tree-optimization/77979 (ICE on valid code at -Os and above on…

re PR tree-optimization/77979 (ICE on valid code at -Os and above on x86_64-linux-gnu: Segmentation fault)

2016-10-14  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/77979
	* tree-vrp.c (compare_name_with_value): Handle released SSA names
	in the equivalency sets.
	(compare_names): Likewise.

	* gcc.dg/torture/pr77979.c: New testcase.

From-SVN: r241162

gcc/ChangeLog

+2016-10-14  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/77979
+	* tree-vrp.c (compare_name_with_value): Handle released SSA names
+	in the equivalency sets.
+	(compare_names): Likewise.
+
 2016-10-14  Martin Liska  <mliska@suse.cz>
 
 	* builtins.h(target_char_cst_p): Declare the function.

gcc/testsuite/ChangeLog

+2016-10-14  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/77979
+	* gcc.dg/torture/pr77979.c: New testcase.
+
 2016-10-14  Martin Liska  <mliska@suse.cz>
 
 	* gcc.dg/tree-ssa/builtins-folding-generic.c: New test.

gcc/testsuite/gcc.dg/torture/pr77979.c

+/* { dg-do compile } */
+
+int a, b, c, d, e, f;
+
+void fn1 ()
+{ 
+  int g = b;
+  a = -~(d || a) << 4 || e;
+  b = c || g ^ a;
+  if (f < g)
+    d = e;
+}

gcc/tree-vrp.c

@@ -7188,9 +7188,13 @@ compare_name_with_value (enum tree_code comp, tree var, tree val,
 
   EXECUTE_IF_SET_IN_BITMAP (e, 0, i, bi)
     {
+      tree name = ssa_name (i);
+      if (! name)
+	continue;
+
       if (! use_equiv_p
-	  && ! SSA_NAME_IS_DEFAULT_DEF (ssa_name (i))
-	  && prop_simulate_again_p (SSA_NAME_DEF_STMT (ssa_name (i))))
+	  && ! SSA_NAME_IS_DEFAULT_DEF (name)
+	  && prop_simulate_again_p (SSA_NAME_DEF_STMT (name)))
 	continue;
 
       equiv_vr = get_vr_for_comparison (i);
@@ -7289,11 +7293,17 @@ compare_names (enum tree_code comp, tree n1, tree n2,
      of the loop just to check N1 and N2 ranges.  */
   EXECUTE_IF_SET_IN_BITMAP (e1, 0, i1, bi1)
     {
+      if (! ssa_name (i1))
+	continue;
+
       value_range vr1 = get_vr_for_comparison (i1);
 
       t = retval = NULL_TREE;
       EXECUTE_IF_SET_IN_BITMAP (e2, 0, i2, bi2)
 	{
+	  if (! ssa_name (i2))
+	    continue;
+
 	  bool sop = false;
 
 	  value_range vr2 = get_vr_for_comparison (i2);