--- gcc/fold-const.c.jj	2013-02-01 16:00:23.000000000 +0100
+++ gcc/fold-const.c	2013-02-08 11:58:07.063147647 +0100
@@ -5695,6 +5695,11 @@ extract_muldiv_1 (tree t, tree c, enum t
         break;
       /* FALLTHROUGH */
     case NEGATE_EXPR:
+      /* For division and modulus, type can't be unsigned, as e.g.
+	 (-(x / 2U)) / 2U isn't equal to -((x / 2U) / 2U) for x >= 2.
+	 For signed types, even with wrapping overflow, this is fine.  */
+      if (code != MULT_EXPR && TYPE_UNSIGNED (type))
+	break;
       if ((t1 = extract_muldiv (op0, c, code, wide_type, strict_overflow_p))
 	  != 0)
 	return fold_build1 (tcode, ctype, fold_convert (ctype, t1));
--- gcc/testsuite/gcc.c-torture/execute/pr56250.c.jj	2013-02-08 12:12:43.477013120 +0100
+++ gcc/testsuite/gcc.c-torture/execute/pr56250.c	2013-02-08 11:58:20.000000000 +0100
@@ -0,0 +1,13 @@
+/* PR tree-optimization/56250 */
+
+extern void abort (void);
+
+int
+main ()
+{
+  unsigned int x = 2;
+  unsigned int y = (0U - x / 2) / 2;
+  if (-1U / x != y)
+    abort ();
+  return 0;
+}