new opcode OP_LOADF (load immediate float)

lcode.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lcode.c,v 2.121 2017/06/29 15:06:44 roberto Exp roberto $
+** $Id: lcode.c,v 2.122 2017/09/13 19:50:08 roberto Exp roberto $
 ** Code generator for Lua
 ** See Copyright Notice in lua.h
 */
@@ -579,6 +579,18 @@ void luaK_int (FuncState *fs, int reg, lua_Integer i) {
 }
 
 
+static void luaK_float (FuncState *fs, int reg, lua_Number f) {
+  TValue v;
+  lua_Integer fi;
+  setfltvalue(&v, f);
+  if (luaV_tointeger(&v, &fi, 0) &&
+      l_castS2U(fi) + MAXARG_sBx <= l_castS2U(MAXARG_Bx))
+    luaK_codeAsBx(fs, OP_LOADF, reg, cast_int(fi));
+  else
+    luaK_codek(fs, reg, luaK_numberK(fs, f));
+}
+
+
 /*
 ** Fix an expression to return the number of results 'nresults'.
 ** Either 'e' is a multi-ret expression (function call or vararg)
@@ -688,7 +700,7 @@ static void discharge2reg (FuncState *fs, expdesc *e, int reg) {
       break;
     }
     case VKFLT: {
-      luaK_codek(fs, reg, luaK_numberK(fs, e->u.nval));
+      luaK_float(fs, reg, e->u.nval);
       break;
     }
     case VKINT: {

lopcodes.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lopcodes.c,v 1.61 2017/09/13 19:50:08 roberto Exp roberto $
+** $Id: lopcodes.c,v 1.62 2017/09/15 14:19:06 roberto Exp roberto $
 ** Opcodes for Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -20,6 +20,7 @@
 LUAI_DDEF const char *const luaP_opnames[NUM_OPCODES+1] = {
   "MOVE",
   "LOADI",
+  "LOADF",
   "LOADK",
   "LOADKX",
   "LOADBOOL",
@@ -82,6 +83,7 @@ LUAI_DDEF const lu_byte luaP_opmodes[NUM_OPCODES] = {
 /*       T  A    B       C     mode		   opcode	*/
   opmode(0, 1, OpArgR, OpArgN, iABC)		/* OP_MOVE */
  ,opmode(0, 1, OpArgU, OpArgN, iAsBx)		/* OP_LOADI */
+ ,opmode(0, 1, OpArgU, OpArgN, iAsBx)		/* OP_LOADF */
  ,opmode(0, 1, OpArgK, OpArgN, iABx)		/* OP_LOADK */
  ,opmode(0, 1, OpArgN, OpArgN, iABx)		/* OP_LOADKX */
  ,opmode(0, 1, OpArgU, OpArgU, iABC)		/* OP_LOADBOOL */

lopcodes.h

@@ -1,5 +1,5 @@
 /*
-** $Id: lopcodes.h,v 1.158 2017/09/15 14:19:06 roberto Exp roberto $
+** $Id: lopcodes.h,v 1.159 2017/09/18 16:07:54 roberto Exp roberto $
 ** Opcodes for Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -175,6 +175,7 @@ name		args	description
 ------------------------------------------------------------------------*/
 OP_MOVE,/*	A B	R(A) := R(B)					*/
 OP_LOADI,/*	A sBx	R(A) := sBx					*/
+OP_LOADF,/*	A sBx	R(A) := (lua_Number)sBx				*/
 OP_LOADK,/*	A Bx	R(A) := Kst(Bx)					*/
 OP_LOADKX,/*	A 	R(A) := Kst(extra arg)				*/
 OP_LOADBOOL,/*	A B C	R(A) := (Bool)B; if (C) pc++			*/

lvm.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lvm.c,v 2.291 2017/08/14 18:33:14 roberto Exp roberto $
+** $Id: lvm.c,v 2.292 2017/09/13 19:50:08 roberto Exp roberto $
 ** Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -829,6 +829,11 @@ void luaV_execute (lua_State *L) {
         setivalue(s2v(ra), b);
         vmbreak;
       }
+      vmcase(OP_LOADF) {
+        int b = GETARG_sBx(i);
+        setfltvalue(s2v(ra), cast_num(b));
+        vmbreak;
+      }
       vmcase(OP_LOADKX) {
         TValue *rb;
         lua_assert(GET_OPCODE(*pc) == OP_EXTRAARG);