re PR middle-end/31710 (ICE in in set_value_range, at tree-vrp.c:278)

./:	PR middle-end/31710
	* tree.c (build_distinct_type_copy): If TYPE_MIN_VALUE or
	TYPE_MAX_VALUE exist, convert them to the new type.
testsuite/:
	PR middle-end/31710
	* gcc.c-torture/compile/pr31710.c: New test.

From-SVN: r124237

gcc/ChangeLog

+2007-04-27  Ian Lance Taylor  <iant@google.com>
+
+	PR middle-end/31710
+	* tree.c (build_distinct_type_copy): If TYPE_MIN_VALUE or
+	TYPE_MAX_VALUE exist, convert them to the new type.
+
 2007-04-27  Zdenek Dvorak  <dvorakz@suse.cz>
 
 	* tree-cfgcleanup.c (cleanup_tree_cfg): Verify dominance info

gcc/testsuite/ChangeLog

+2007-04-27  Ian Lance Taylor  <iant@google.com>
+
+	PR middle-end/31710
+	* gcc.c-torture/compile/pr31710.c: New test.
+
 2007-04-27  Richard Guenther  <rguenther@suse.de>
 
 	PR tree-optimization/30965

gcc/testsuite/gcc.c-torture/compile/pr31710.c

+typedef short SHORT;
+struct v { SHORT i; };
+void f(struct v *pin, struct v *pout) {
+        if (pin->i == (-0x7fff)-1)
+            pout->i = -pin->i;
+}

gcc/tree.c

@@ -4174,6 +4174,15 @@ build_distinct_type_copy (tree type)
   TYPE_MAIN_VARIANT (t) = t;
   TYPE_NEXT_VARIANT (t) = 0;
   
+  /* VRP assumes that TREE_TYPE (TYPE_MIN_VALUE (type)) == type.  */
+  if (INTEGRAL_TYPE_P (t) || SCALAR_FLOAT_TYPE_P (t))
+    {
+      if (TYPE_MIN_VALUE (t) != NULL_TREE)
+	TYPE_MIN_VALUE (t) = fold_convert (t, TYPE_MIN_VALUE (t));
+      if (TYPE_MAX_VALUE (t) != NULL_TREE)
+	TYPE_MAX_VALUE (t) = fold_convert (t, TYPE_MAX_VALUE (t));
+    }
+
   return t;
 }