diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index f101f7cf1e9..911737a00f2 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2012-03-05  Richard Henderson  <rth@redhat.com>
+
+	PR target/52481
+	* config/m68k/sync.md (atomic_test_and_set): Use expand_simple_unop
+	instead of calling negqi2 directly.
+
 2012-03-05  Oleg Endo  <olegendo@gcc.gnu.org>
 
 	* config/sh/sh.h (TARGET_ATOMIC_TEST_AND_SET_TRUEVAL): New hook.
diff --git a/gcc/config/m68k/sync.md b/gcc/config/m68k/sync.md
index 5d5002a9c81..6c840f51b60 100644
--- a/gcc/config/m68k/sync.md
+++ b/gcc/config/m68k/sync.md
@@ -62,8 +62,11 @@
    (match_operand:SI 2 "const_int_operand" "")]		;; model
   ""
 {
-  emit_insn (gen_atomic_test_and_set_1 (operands[0], operands[1]));
-  emit_insn (gen_negqi2 (operands[0], operands[0]));
+  rtx t = gen_reg_rtx (QImode);
+  emit_insn (gen_atomic_test_and_set_1 (t, operands[1]));
+  t = expand_simple_unop (QImode, NEG, t, operands[0], 0);
+  if (t != operands[0])
+    emit_move_insn (operands[0], t);
   DONE;
 })