2005-05-13  Jakub Jelinek  <jakub@redhat.com>

	PR target/19005
	* config/i386/i386.md (swapqi): Use +q instead of +r constraints.

	* gcc.c-torture/execute/pr19005.c: New test.

--- gcc/config/i386/i386.md.jj	2004-07-01 12:40:54.000000000 +0200
+++ gcc/config/i386/i386.md	2005-05-13 13:56:14.000000000 +0200
@@ -2107,8 +2107,8 @@
 })
 
 (define_insn "*swapqi"
-  [(set (match_operand:QI 0 "register_operand" "+r")
-	(match_operand:QI 1 "register_operand" "+r"))
+  [(set (match_operand:QI 0 "register_operand" "+q")
+	(match_operand:QI 1 "register_operand" "+q"))
    (set (match_dup 1)
 	(match_dup 0))]
   ""
--- gcc/testsuite/gcc.c-torture/execute/pr19005.c.jj	2005-04-07 15:51:53.775361896 +0200
+++ gcc/testsuite/gcc.c-torture/execute/pr19005.c	2005-05-13 13:33:21.000000000 +0200
@@ -0,0 +1,38 @@
+/* PR target/19005 */
+extern void abort (void);
+
+int v, s;
+
+void
+bar (int a, int b)
+{
+  unsigned char x = v;
+
+  if (!s)
+    {
+      if (a != x || b != (unsigned char) (x + 1))
+        abort ();
+    }
+  else if (a != (unsigned char) (x + 1) || b != x)
+    abort ();
+  s ^= 1;
+}
+
+int
+foo (int x)
+{
+  unsigned char a = x, b = x + 1;
+
+  bar (a, b);
+  a ^= b; b ^= a; a ^= b;
+  bar (a, b);
+  return 0;
+}
+
+int
+main (void)
+{
+  for (v = -10; v < 266; v++)
+    foo (v);
+  return 0;
+}