m68k: Limit TAS to 68000 and CF ISA_B.

From-SVN: r185011

gcc/ChangeLog

+2012-03-06  Richard Henderson  <rth@redhat.com>
+
+	* config/m68k/m68k.h (ISA_HAS_TAS): New.
+	* config/m68k/sync.md (atomic_test_and_set): Use it.
+	(atomic_test_and_set_1): Likewise.
+
 2012-03-06  Michael Meissner  <meissner@linux.vnet.ibm.com>
 
 	PR target/50310

gcc/config/m68k/m68k.h

@@ -249,6 +249,7 @@ along with GCC; see the file COPYING3.  If not see
 /* Some instructions are common to more than one ISA.  */
 #define ISA_HAS_MVS_MVZ	(TARGET_ISAB || TARGET_ISAC)
 #define ISA_HAS_FF1	(TARGET_ISAAPLUS || TARGET_ISAC)
+#define ISA_HAS_TAS	(!TARGET_COLDFIRE || TARGET_ISAB || TARGET_ISAC)
 
 #define TUNE_68000	(m68k_tune == u68000)
 #define TUNE_68010	(m68k_tune == u68010)

gcc/config/m68k/sync.md

@@ -60,7 +60,7 @@
   [(match_operand:QI 0 "register_operand" "")		;; bool success output
    (match_operand:QI 1 "memory_operand" "")		;; memory
    (match_operand:SI 2 "const_int_operand" "")]		;; model
-  ""
+  "ISA_HAS_TAS"
 {
   rtx t = gen_reg_rtx (QImode);
   emit_insn (gen_atomic_test_and_set_1 (t, operands[1]));
@@ -77,5 +77,5 @@
 	  UNSPECV_TAS_1))
    (set (match_dup 1)
 	(unspec_volatile:QI [(match_dup 1)] UNSPECV_TAS_2))]
-  ""
+  "ISA_HAS_TAS"
   "tas %1\;sne %0")