new function 'luaT_trybiniTM'

to handle tag methods for instructions with immediate integer arguments

lvm.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lvm.c,v 2.293 2017/09/19 18:38:14 roberto Exp roberto $
+** $Id: lvm.c,v 2.294 2017/09/26 18:14:45 roberto Exp roberto $
 ** Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -999,15 +999,8 @@ void luaV_execute (lua_State *L) {
         else if (tonumberns(rb, nb)) {
           setfltvalue(s2v(ra), luai_numadd(L, nb, cast_num(ic)));
         }
-        else {
-          TValue aux; TValue *rc;
-          setivalue(&aux, ic);
-          if (GETARG_Bk(i)) {  /* arguments were exchanged? */
-            rc = rb; rb = &aux;  /* correct them */
-          }
-          else rc = &aux;
-          Protect(luaT_trybinTM(L, rb, rc, ra, TM_ADD));
-        }
+        else
+          Protect(luaT_trybiniTM(L, rb, ic, GETARG_Bk(i), ra, TM_ADD));
         vmbreak;
       }
       vmcase(OP_ADD) {