(movhi): Corrected case of moving constant to memory.

From-SVN: r13389

gcc/config/1750a/1750a.md

 ;;- Machine description for GNU compiler
 ;;- MIL-STD-1750A version.
-;; Copyright (C) 1994, 1995, 1996 Free Software Foundation, Inc.
+;; Copyright (C) 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
 ;; Contributed by O.M.Kellogg, DASA (oliver.kellogg@space.otn.dasa.de).
 
 ;; This file is part of GNU CC.
@@ -451,9 +451,14 @@
   ""
   "
    {
-    if (GET_CODE(operands[0]) == MEM &&
-        GET_CODE(operands[1]) == MEM)
-      operands[1] = force_reg (HImode, operands[1]);
+    if (GET_CODE(operands[0]) == MEM)
+      {
+	rtx op1 = operands[1];
+        if (GET_CODE(op1) == MEM
+	    || (GET_CODE(op1) == CONST_INT
+		&& (INTVAL(op1) < 0 || INTVAL(op1) > 15)))
+	  operands[1] = force_reg (HImode, operands[1]);
+      }
    }")