diff --git a/lcode.c b/lcode.c
index 0fcde154..775a22c3 100644
--- a/lcode.c
+++ b/lcode.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lcode.c,v 2.123 2017/09/19 18:38:14 roberto Exp roberto $
+** $Id: lcode.c,v 2.124 2017/09/26 17:10:49 roberto Exp roberto $
 ** Code generator for Lua
 ** See Copyright Notice in lua.h
 */
@@ -1157,7 +1157,7 @@ static void codeunexpval (FuncState *fs, OpCode op, expdesc *e, int line) {
 ** (everything but logical operators 'and'/'or' and comparison
 ** operators).
 ** Expression to produce final result will be encoded in 'e1'.
-** Because 'luaK_exp2RK' can free registers, its calls must be
+** Because 'luaK_exp2anyreg' can free registers, its calls must be
 ** in "stack order" (that is, first on 'e2', which may have more
 ** recent registers to be released).
 */
@@ -1176,8 +1176,8 @@ static void codebinexpval (FuncState *fs, OpCode op,
     op = OP_ADDI;
   }
   else {
-    v2 = luaK_exp2RK(fs, e2);  /* both operands are "RK" */
-    v1 = luaK_exp2RK(fs, e1);
+    v2 = luaK_exp2anyreg(fs, e2);  /* both operands are in registers */
+    v1 = luaK_exp2anyreg(fs, e1);
   }
   freeexps(fs, e1, e2);
   e1->u.info = luaK_codeABC(fs, op, 0, v1, v2);  /* generate opcode */
@@ -1188,12 +1188,12 @@ static void codebinexpval (FuncState *fs, OpCode op,
 
 /*
 ** Emit code for comparisons.
-** 'e1' was already put in R/K form by 'luaK_infix'.
+** 'e1' was already put in register by 'luaK_infix'.
 */
 static void codecomp (FuncState *fs, BinOpr opr, expdesc *e1, expdesc *e2) {
   int rk1 = (e1->k == VK) ? RKASK(e1->u.info)
                           : check_exp(e1->k == VNONRELOC, e1->u.info);
-  int rk2 = luaK_exp2RK(fs, e2);
+  int rk2 = luaK_exp2anyreg(fs, e2);
   freeexps(fs, e1, e2);
   switch (opr) {
     case OPR_NE: {  /* '(a ~= b)' ==> 'not (a == b)' */
@@ -1258,14 +1258,13 @@ void luaK_infix (FuncState *fs, BinOpr op, expdesc *v) {
     case OPR_MOD: case OPR_POW:
     case OPR_BAND: case OPR_BOR: case OPR_BXOR:
     case OPR_SHL: case OPR_SHR: {
-      if (!tonumeral(v, NULL))
-        luaK_exp2RK(fs, v);
-      /* else keep numeral, which may be folded with 2nd operand */
-      break;
+      if (tonumeral(v, NULL))
+        break;  /* keep numeral, which may be folded with 2nd operand */
+      /* else *//* FALLTHROUGH */
     }
     case OPR_EQ: case OPR_LT: case OPR_LE:
     case OPR_NE: case OPR_GT: case OPR_GE: {
-      luaK_exp2RK(fs, v);
+      luaK_exp2anyreg(fs, v);
       break;
     }
     default: lua_assert(0);
diff --git a/lopcodes.c b/lopcodes.c
index 9279a8df..9617b720 100644
--- a/lopcodes.c
+++ b/lopcodes.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lopcodes.c,v 1.62 2017/09/15 14:19:06 roberto Exp roberto $
+** $Id: lopcodes.c,v 1.63 2017/09/19 18:38:14 roberto Exp roberto $
 ** Opcodes for Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -101,18 +101,18 @@ LUAI_DDEF const lu_byte luaP_opmodes[NUM_OPCODES] = {
  ,opmode(0, 1, OpArgU, OpArgU, iABC)		/* OP_NEWTABLE */
  ,opmode(0, 1, OpArgR, OpArgK, iABC)		/* OP_SELF */
  ,opmode(0, 1, OpArgR, OpArgU, iABC)		/* OP_ADDI */
- ,opmode(0, 1, OpArgK, OpArgK, iABC)		/* OP_ADD */
- ,opmode(0, 1, OpArgK, OpArgK, iABC)		/* OP_SUB */
- ,opmode(0, 1, OpArgK, OpArgK, iABC)		/* OP_MUL */
- ,opmode(0, 1, OpArgK, OpArgK, iABC)		/* OP_MOD */
- ,opmode(0, 1, OpArgK, OpArgK, iABC)		/* OP_POW */
- ,opmode(0, 1, OpArgK, OpArgK, iABC)		/* OP_DIV */
- ,opmode(0, 1, OpArgK, OpArgK, iABC)		/* OP_IDIV */
- ,opmode(0, 1, OpArgK, OpArgK, iABC)		/* OP_BAND */
- ,opmode(0, 1, OpArgK, OpArgK, iABC)		/* OP_BOR */
- ,opmode(0, 1, OpArgK, OpArgK, iABC)		/* OP_BXOR */
- ,opmode(0, 1, OpArgK, OpArgK, iABC)		/* OP_SHL */
- ,opmode(0, 1, OpArgK, OpArgK, iABC)		/* OP_SHR */
+ ,opmode(0, 1, OpArgR, OpArgR, iABC)		/* OP_ADD */
+ ,opmode(0, 1, OpArgR, OpArgR, iABC)		/* OP_SUB */
+ ,opmode(0, 1, OpArgR, OpArgR, iABC)		/* OP_MUL */
+ ,opmode(0, 1, OpArgR, OpArgR, iABC)		/* OP_MOD */
+ ,opmode(0, 1, OpArgR, OpArgR, iABC)		/* OP_POW */
+ ,opmode(0, 1, OpArgR, OpArgR, iABC)		/* OP_DIV */
+ ,opmode(0, 1, OpArgR, OpArgR, iABC)		/* OP_IDIV */
+ ,opmode(0, 1, OpArgR, OpArgR, iABC)		/* OP_BAND */
+ ,opmode(0, 1, OpArgR, OpArgR, iABC)		/* OP_BOR */
+ ,opmode(0, 1, OpArgR, OpArgR, iABC)		/* OP_BXOR */
+ ,opmode(0, 1, OpArgR, OpArgR, iABC)		/* OP_SHL */
+ ,opmode(0, 1, OpArgR, OpArgR, iABC)		/* OP_SHR */
  ,opmode(0, 1, OpArgR, OpArgN, iABC)		/* OP_UNM */
  ,opmode(0, 1, OpArgR, OpArgN, iABC)		/* OP_BNOT */
  ,opmode(0, 1, OpArgR, OpArgN, iABC)		/* OP_NOT */
@@ -120,9 +120,9 @@ LUAI_DDEF const lu_byte luaP_opmodes[NUM_OPCODES] = {
  ,opmode(0, 1, OpArgR, OpArgR, iABC)		/* OP_CONCAT */
  ,opmode(0, 0, OpArgN, OpArgN, iABC)		/* OP_CLOSE */
  ,opmode(0, 0, OpArgU, OpArgN, iAsBx)		/* OP_JMP */
- ,opmode(1, 0, OpArgK, OpArgK, iABC)		/* OP_EQ */
- ,opmode(1, 0, OpArgK, OpArgK, iABC)		/* OP_LT */
- ,opmode(1, 0, OpArgK, OpArgK, iABC)		/* OP_LE */
+ ,opmode(1, 0, OpArgR, OpArgR, iABC)		/* OP_EQ */
+ ,opmode(1, 0, OpArgR, OpArgR, iABC)		/* OP_LT */
+ ,opmode(1, 0, OpArgR, OpArgR, iABC)		/* OP_LE */
  ,opmode(1, 0, OpArgN, OpArgU, iABC)		/* OP_TEST */
  ,opmode(1, 1, OpArgR, OpArgU, iABC)		/* OP_TESTSET */
  ,opmode(0, 1, OpArgU, OpArgU, iABC)		/* OP_CALL */
diff --git a/lopcodes.h b/lopcodes.h
index 9e0ce498..d28948d8 100644
--- a/lopcodes.h
+++ b/lopcodes.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lopcodes.h,v 1.159 2017/09/18 16:07:54 roberto Exp roberto $
+** $Id: lopcodes.h,v 1.160 2017/09/19 18:38:14 roberto Exp roberto $
 ** Opcodes for Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -198,18 +198,18 @@ OP_NEWTABLE,/*	A B C	R(A) := {} (size = B,C)				*/
 OP_SELF,/*	A B C	R(A+1) := R(B); R(A) := R(B)[RK(C):string]	*/
 
 OP_ADDI,/*	A B C	R(A) := R(B) + C				*/
-OP_ADD,/*	A B C	R(A) := RK(B) + RK(C)				*/
-OP_SUB,/*	A B C	R(A) := RK(B) - RK(C)				*/
-OP_MUL,/*	A B C	R(A) := RK(B) * RK(C)				*/
-OP_MOD,/*	A B C	R(A) := RK(B) % RK(C)				*/
-OP_POW,/*	A B C	R(A) := RK(B) ^ RK(C)				*/
-OP_DIV,/*	A B C	R(A) := RK(B) / RK(C)				*/
-OP_IDIV,/*	A B C	R(A) := RK(B) // RK(C)				*/
-OP_BAND,/*	A B C	R(A) := RK(B) & RK(C)				*/
-OP_BOR,/*	A B C	R(A) := RK(B) | RK(C)				*/
-OP_BXOR,/*	A B C	R(A) := RK(B) ~ RK(C)				*/
-OP_SHL,/*	A B C	R(A) := RK(B) << RK(C)				*/
-OP_SHR,/*	A B C	R(A) := RK(B) >> RK(C)				*/
+OP_ADD,/*	A B C	R(A) := R(B) + R(C)				*/
+OP_SUB,/*	A B C	R(A) := R(B) - R(C)				*/
+OP_MUL,/*	A B C	R(A) := R(B) * R(C)				*/
+OP_MOD,/*	A B C	R(A) := R(B) % R(C)				*/
+OP_POW,/*	A B C	R(A) := R(B) ^ R(C)				*/
+OP_DIV,/*	A B C	R(A) := R(B) / R(C)				*/
+OP_IDIV,/*	A B C	R(A) := R(B) // R(C)				*/
+OP_BAND,/*	A B C	R(A) := R(B) & R(C)				*/
+OP_BOR,/*	A B C	R(A) := R(B) | R(C)				*/
+OP_BXOR,/*	A B C	R(A) := R(B) ~ R(C)				*/
+OP_SHL,/*	A B C	R(A) := R(B) << R(C)				*/
+OP_SHR,/*	A B C	R(A) := R(B) >> R(C)				*/
 OP_UNM,/*	A B	R(A) := -R(B)					*/
 OP_BNOT,/*	A B	R(A) := ~R(B)					*/
 OP_NOT,/*	A B	R(A) := not R(B)				*/
@@ -219,9 +219,9 @@ OP_CONCAT,/*	A B C	R(A) := R(B).. ... ..R(C)			*/
 
 OP_CLOSE,/*	A	close all upvalues >= R(A)			*/
 OP_JMP,/*	sBx	pc+=sBx						*/
-OP_EQ,/*	A B C	if ((RK(B) == RK(C)) ~= A) then pc++		*/
-OP_LT,/*	A B C	if ((RK(B) <  RK(C)) ~= A) then pc++		*/
-OP_LE,/*	A B C	if ((RK(B) <= RK(C)) ~= A) then pc++		*/
+OP_EQ,/*	A B C	if ((R(B) == R(C)) ~= A) then pc++		*/
+OP_LT,/*	A B C	if ((R(B) <  R(C)) ~= A) then pc++		*/
+OP_LE,/*	A B C	if ((R(B) <= R(C)) ~= A) then pc++		*/
 
 OP_TEST,/*	A C	if not (R(A) <=> C) then pc++			*/
 OP_TESTSET,/*	A B C	if (R(B) <=> C) then R(A) := R(B) else pc++	*/
diff --git a/lvm.c b/lvm.c
index a41b44d6..75eb8fe4 100644
--- a/lvm.c
+++ b/lvm.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lvm.c,v 2.292 2017/09/13 19:50:08 roberto Exp roberto $
+** $Id: lvm.c,v 2.293 2017/09/19 18:38:14 roberto Exp roberto $
 ** Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -739,8 +739,6 @@ void luaV_finishOp (lua_State *L) {
 #define RC(i)	check_exp(getCMode(GET_OPCODE(i)) == OpArgR, base+GETARG_C(i))
 #define vRC(i)	s2v(RC(i))
 #define KC(i)	check_exp(getCMode(GET_OPCODE(i)) == OpArgK, k+GETARG_C(i))
-#define RKB(i)	check_exp(getBMode(GET_OPCODE(i)) == OpArgK, \
-	(GETARG_Bk(i)) ? k + GETARG_Br(i) : s2v(base + GETARG_Br(i)))
 #define RKC(i)	check_exp(getCMode(GET_OPCODE(i)) == OpArgK, \
 	(GETARG_Ck(i)) ? k + GETARG_Cr(i) : s2v(base + GETARG_Cr(i)))
 
@@ -1013,8 +1011,8 @@ void luaV_execute (lua_State *L) {
         vmbreak;
       }
       vmcase(OP_ADD) {
-        TValue *rb = RKB(i);
-        TValue *rc = RKC(i);
+        TValue *rb = vRB(i);
+        TValue *rc = vRC(i);
         lua_Number nb; lua_Number nc;
         if (ttisinteger(rb) && ttisinteger(rc)) {
           lua_Integer ib = ivalue(rb); lua_Integer ic = ivalue(rc);
@@ -1027,8 +1025,8 @@ void luaV_execute (lua_State *L) {
         vmbreak;
       }
       vmcase(OP_SUB) {
-        TValue *rb = RKB(i);
-        TValue *rc = RKC(i);
+        TValue *rb = vRB(i);
+        TValue *rc = vRC(i);
         lua_Number nb; lua_Number nc;
         if (ttisinteger(rb) && ttisinteger(rc)) {
           lua_Integer ib = ivalue(rb); lua_Integer ic = ivalue(rc);
@@ -1041,8 +1039,8 @@ void luaV_execute (lua_State *L) {
         vmbreak;
       }
       vmcase(OP_MUL) {
-        TValue *rb = RKB(i);
-        TValue *rc = RKC(i);
+        TValue *rb = vRB(i);
+        TValue *rc = vRC(i);
         lua_Number nb; lua_Number nc;
         if (ttisinteger(rb) && ttisinteger(rc)) {
           lua_Integer ib = ivalue(rb); lua_Integer ic = ivalue(rc);
@@ -1055,8 +1053,8 @@ void luaV_execute (lua_State *L) {
         vmbreak;
       }
       vmcase(OP_DIV) {  /* float division (always with floats) */
-        TValue *rb = RKB(i);
-        TValue *rc = RKC(i);
+        TValue *rb = vRB(i);
+        TValue *rc = vRC(i);
         lua_Number nb; lua_Number nc;
         if (tonumberns(rb, nb) && tonumberns(rc, nc)) {
           setfltvalue(s2v(ra), luai_numdiv(L, nb, nc));
@@ -1065,8 +1063,8 @@ void luaV_execute (lua_State *L) {
         vmbreak;
       }
       vmcase(OP_BAND) {
-        TValue *rb = RKB(i);
-        TValue *rc = RKC(i);
+        TValue *rb = vRB(i);
+        TValue *rc = vRC(i);
         lua_Integer ib; lua_Integer ic;
         if (tointeger(rb, &ib) && tointeger(rc, &ic)) {
           setivalue(s2v(ra), intop(&, ib, ic));
@@ -1075,8 +1073,8 @@ void luaV_execute (lua_State *L) {
         vmbreak;
       }
       vmcase(OP_BOR) {
-        TValue *rb = RKB(i);
-        TValue *rc = RKC(i);
+        TValue *rb = vRB(i);
+        TValue *rc = vRC(i);
         lua_Integer ib; lua_Integer ic;
         if (tointeger(rb, &ib) && tointeger(rc, &ic)) {
           setivalue(s2v(ra), intop(|, ib, ic));
@@ -1085,8 +1083,8 @@ void luaV_execute (lua_State *L) {
         vmbreak;
       }
       vmcase(OP_BXOR) {
-        TValue *rb = RKB(i);
-        TValue *rc = RKC(i);
+        TValue *rb = vRB(i);
+        TValue *rc = vRC(i);
         lua_Integer ib; lua_Integer ic;
         if (tointeger(rb, &ib) && tointeger(rc, &ic)) {
           setivalue(s2v(ra), intop(^, ib, ic));
@@ -1095,8 +1093,8 @@ void luaV_execute (lua_State *L) {
         vmbreak;
       }
       vmcase(OP_SHL) {
-        TValue *rb = RKB(i);
-        TValue *rc = RKC(i);
+        TValue *rb = vRB(i);
+        TValue *rc = vRC(i);
         lua_Integer ib; lua_Integer ic;
         if (tointeger(rb, &ib) && tointeger(rc, &ic)) {
           setivalue(s2v(ra), luaV_shiftl(ib, ic));
@@ -1105,8 +1103,8 @@ void luaV_execute (lua_State *L) {
         vmbreak;
       }
       vmcase(OP_SHR) {
-        TValue *rb = RKB(i);
-        TValue *rc = RKC(i);
+        TValue *rb = vRB(i);
+        TValue *rc = vRC(i);
         lua_Integer ib; lua_Integer ic;
         if (tointeger(rb, &ib) && tointeger(rc, &ic)) {
           setivalue(s2v(ra), luaV_shiftl(ib, -ic));
@@ -1115,8 +1113,8 @@ void luaV_execute (lua_State *L) {
         vmbreak;
       }
       vmcase(OP_MOD) {
-        TValue *rb = RKB(i);
-        TValue *rc = RKC(i);
+        TValue *rb = vRB(i);
+        TValue *rc = vRC(i);
         lua_Number nb; lua_Number nc;
         if (ttisinteger(rb) && ttisinteger(rc)) {
           lua_Integer ib = ivalue(rb); lua_Integer ic = ivalue(rc);
@@ -1131,8 +1129,8 @@ void luaV_execute (lua_State *L) {
         vmbreak;
       }
       vmcase(OP_IDIV) {  /* floor division */
-        TValue *rb = RKB(i);
-        TValue *rc = RKC(i);
+        TValue *rb = vRB(i);
+        TValue *rc = vRC(i);
         lua_Number nb; lua_Number nc;
         if (ttisinteger(rb) && ttisinteger(rc)) {
           lua_Integer ib = ivalue(rb); lua_Integer ic = ivalue(rc);
@@ -1145,8 +1143,8 @@ void luaV_execute (lua_State *L) {
         vmbreak;
       }
       vmcase(OP_POW) {
-        TValue *rb = RKB(i);
-        TValue *rc = RKC(i);
+        TValue *rb = vRB(i);
+        TValue *rc = vRC(i);
         lua_Number nb; lua_Number nc;
         if (tonumberns(rb, nb) && tonumberns(rc, nc)) {
           setfltvalue(s2v(ra), luai_numpow(L, nb, nc));
@@ -1212,8 +1210,8 @@ void luaV_execute (lua_State *L) {
         vmbreak;
       }
       vmcase(OP_EQ) {
-        TValue *rb = RKB(i);
-        TValue *rc = RKC(i);
+        TValue *rb = vRB(i);
+        TValue *rc = vRC(i);
         Protect(
           if (luaV_equalobj(L, rb, rc) != GETARG_A(i))
             pc++;
@@ -1223,8 +1221,8 @@ void luaV_execute (lua_State *L) {
         vmbreak;
       }
       vmcase(OP_LT) {
-        TValue *rb = RKB(i);
-        TValue *rc = RKC(i);
+        TValue *rb = vRB(i);
+        TValue *rc = vRC(i);
         int res;
         if (ttisinteger(rb) && ttisinteger(rc))
           res = (ivalue(rb) < ivalue(rc));
@@ -1238,8 +1236,8 @@ void luaV_execute (lua_State *L) {
         vmbreak;
       }
       vmcase(OP_LE) {
-        TValue *rb = RKB(i);
-        TValue *rc = RKC(i);
+        TValue *rb = vRB(i);
+        TValue *rc = vRC(i);
         int res;
         if (ttisinteger(rb) && ttisinteger(rc))
           res = (ivalue(rb) <= ivalue(rc));