re PR c/58346 (ICE with SIGFPE at -O1 and above on x86_64-linux-gnu (affecting…

re PR c/58346 (ICE with SIGFPE at -O1 and above on x86_64-linux-gnu (affecting trunk, 4.8, 4.7, and 4.6))

	PR c/58346
	* gimple-fold.c (fold_array_ctor_reference): Don't fold if element
	size is zero.
testsuite/
	* gcc.dg/pr58346.c: New test.

From-SVN: r206715

gcc/ChangeLog

+2014-01-17  Marek Polacek  <polacek@redhat.com>
+
+	PR c/58346
+	* gimple-fold.c (fold_array_ctor_reference): Don't fold if element
+	size is zero.
+
 2014-01-17  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/46590

gcc/gimple-fold.c

@@ -2940,7 +2940,8 @@ fold_array_ctor_reference (tree type, tree ctor,
      be larger than size of array element.  */
   if (!TYPE_SIZE_UNIT (type)
       || TREE_CODE (TYPE_SIZE_UNIT (type)) != INTEGER_CST
-      || elt_size.slt (tree_to_double_int (TYPE_SIZE_UNIT (type))))
+      || elt_size.slt (tree_to_double_int (TYPE_SIZE_UNIT (type)))
+      || elt_size.is_zero ())
     return NULL_TREE;
 
   /* Compute the array index we look for.  */

gcc/testsuite/ChangeLog

+2014-01-17  Marek Polacek  <polacek@redhat.com>
+
+	PR c/58346
+	* gcc.dg/pr58346.c: New test.
+
 2014-01-17  Jakub Jelinek  <jakub@redhat.com>
 
 	PR testsuite/58776

gcc/testsuite/gcc.dg/pr58346.c

+/* PR tree-optimization/58346 */
+/* { dg-do compile } */
+/* { dg-options "-O" } */
+
+struct U {};
+static struct U b[1] = { };
+extern void bar (struct U);
+
+void
+foo (void)
+{
+  bar (b[0]);
+}
+
+void
+baz (void)
+{
+  foo ();
+}