re PR target/81821 ([RX] xchg_mem<mode> uses wrong memory operand size)

gcc/
	PR target/81821
	* config/rx/rx.md (BW): New mode attribute.
	(sync_lock_test_and_setsi): Add mode suffix to insn output.

From-SVN: r256536

gcc/ChangeLog

+2018-01-11  Oleg Endo  <olegendo@gcc.gnu.org>
+
+	PR target/81821
+	* config/rx/rx.md (BW): New mode attribute.
+	(sync_lock_test_and_setsi): Add mode suffix to insn output.
+
 2018-01-11  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/83435

gcc/config/rx/rx.md

@@ -2169,6 +2169,7 @@
   [(plus "add") (minus "sub") (ior "ior") (xor "xor") (and "and")])
 
 (define_mode_iterator QIHI [QI HI])
+(define_mode_attr BW [(QI "B") (HI "W")])
 
 (define_insn "sync_lock_test_and_setsi"
   [(set (match_operand:SI 0 "register_operand"   "=r,r")
@@ -2210,7 +2211,7 @@
    (set (match_dup 1)
 	(match_operand:QIHI 2 "register_operand"    "0"))]
   ""
-  "xchg\t%1, %0"
+  "xchg\t%1.<BW>, %0"
   [(set_attr "length" "6")
    (set_attr "timings" "22")]
 )