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;

+}