re PR tree-optimization/64269 (ICE with -O3 enabled on Ubuntu 14.04)

	PR tree-optimization/64269
	* tree-ssa-forwprop.c (simplify_builtin_call): Bail out if
	len2 or diff are too large.

	* gcc.c-torture/compile/pr64269.c: New test.

From-SVN: r218669

gcc/ChangeLog

+2014-12-12  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/64269
+	* tree-ssa-forwprop.c (simplify_builtin_call): Bail out if
+	len2 or diff are too large.
+
 2014-12-12  Richard Biener  <rguenther@suse.de>
 
 	PR middle-end/64280

gcc/testsuite/ChangeLog

+2014-12-12  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/64269
+	* gcc.c-torture/compile/pr64269.c: New test.
+
 2014-12-12  Richard Biener  <rguenther@suse.de>
 
 	PR middle-end/64280

gcc/testsuite/gcc.c-torture/compile/pr64269.c

+/* PR tree-optimization/64269 */
+
+void
+foo (char *p)
+{
+  __SIZE_TYPE__ s = ~(__SIZE_TYPE__)0;
+  *p = 0;
+  __builtin_memset (p + 1, 0, s);
+}

gcc/tree-ssa-forwprop.c

@@ -1288,7 +1288,8 @@ simplify_builtin_call (gimple_stmt_iterator *gsi_p, tree callee2)
 	  use_operand_p use_p;
 
 	  if (!tree_fits_shwi_p (val2)
-	      || !tree_fits_uhwi_p (len2))
+	      || !tree_fits_uhwi_p (len2)
+	      || compare_tree_int (len2, 1024) == 1)
 	    break;
 	  if (is_gimple_call (stmt1))
 	    {
@@ -1354,7 +1355,8 @@ simplify_builtin_call (gimple_stmt_iterator *gsi_p, tree callee2)
 	     is not constant, or is bigger than memcpy length, bail out.  */
 	  if (diff == NULL
 	      || !tree_fits_uhwi_p (diff)
-	      || tree_int_cst_lt (len1, diff))
+	      || tree_int_cst_lt (len1, diff)
+	      || compare_tree_int (diff, 1024) == 1)
 	    break;
 
 	  /* Use maximum of difference plus memset length and memcpy length