new opcodes BANDK/BORK/BXORK. (They do not use immediate operands

because, too often, masks in bitwise operations are integers larger
than one byte.)

lcode.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lcode.c,v 2.141 2017/11/30 15:37:16 roberto Exp roberto $
+** $Id: lcode.c,v 2.142 2017/12/04 17:41:30 roberto Exp roberto $
 ** Code generator for Lua
 ** See Copyright Notice in lua.h
 */
@@ -1196,6 +1196,15 @@ static void codeunexpval (FuncState *fs, OpCode op, expdesc *e, int line) {
 }
 
 
+static void finishbinexpval (FuncState *fs, expdesc *e1, expdesc *e2,
+                             int pc, int line) {
+  freeexps(fs, e1, e2);
+  e1->u.info = pc;
+  e1->k = VRELOCABLE;  /* all those operations are relocatable */
+  luaK_fixline(fs, line);
+}
+
+
 /*
 ** Emit code for binary expressions that "produce values"
 ** (everything but logical operators 'and'/'or' and comparison
@@ -1209,10 +1218,8 @@ static void codebinexpval (FuncState *fs, OpCode op,
                            expdesc *e1, expdesc *e2, int line) {
   int v2 = luaK_exp2anyreg(fs, e2);  /* both operands are in registers */
   int v1 = luaK_exp2anyreg(fs, e1);
-  freeexps(fs, e1, e2);
-  e1->u.info = luaK_codeABC(fs, op, 0, v1, v2);  /* generate opcode */
-  e1->k = VRELOCABLE;  /* all those operations are relocatable */
-  luaK_fixline(fs, line);
+  int pc = luaK_codeABC(fs, op, 0, v1, v2);  /* generate opcode */
+  finishbinexpval(fs, e1, e2, pc, line);
 }
 
 
@@ -1223,10 +1230,8 @@ static void codebini (FuncState *fs, OpCode op,
                        expdesc *e1, expdesc *e2, int k, int line) {
   int v2 = cast_int(e2->u.ival);  /* immediate operand */
   int v1 = luaK_exp2anyreg(fs, e1);
-  freeexp(fs, e1);
-  e1->u.info = codeABsC(fs, op, 0, v1, v2, k);  /* generate opcode */
-  e1->k = VRELOCABLE;  /* all those operations are relocatable */
-  luaK_fixline(fs, line);
+  int pc = codeABsC(fs, op, 0, v1, v2, k);  /* generate opcode */
+  finishbinexpval(fs, e1, e2, pc, line);
 }
 
 
@@ -1264,6 +1269,33 @@ static void codecommutative (FuncState *fs, OpCode op,
 }
 
 
+/*
+** Code bitwise operations; they are all associative, so the function
+** tries to put an integer constant as the 2nd operand (a K operand).
+*/
+static void codebitwise (FuncState *fs, BinOpr opr,
+                         expdesc *e1, expdesc *e2, int line) {
+  int inv = 0;
+  int v1, v2, pc;
+  OpCode op;
+  if (e1->k == VKINT && luaK_exp2RK(fs, e1)) {
+    swapexps(e1, e2);  /* 'e2' will be the constant operand */
+    inv = 1;
+  }
+  else if (!(e2->k == VKINT && luaK_exp2RK(fs, e2))) {  /* no constants? */
+    op = cast(OpCode, opr - OPR_BAND + OP_BAND);
+    codebinexpval(fs, op, e1, e2, line);  /* all-register opcodes */
+    return;
+  }
+  v1 = luaK_exp2anyreg(fs, e1);
+  v2 = e2->u.info;  /* index in K array */
+  op = cast(OpCode, opr - OPR_BAND + OP_BANDK);
+  lua_assert(ttisinteger(&fs->f->k[v2]));
+  pc = luaK_codeABCk(fs, op, 0, v1, v2, inv);
+  finishbinexpval(fs, e1, e2, pc, line);
+}
+
+
 /*
 ** Code shift operators. If second operand is constant, use immediate
 ** operand (negating it if shift is in the other direction).
@@ -1468,7 +1500,7 @@ void luaK_posfix (FuncState *fs, BinOpr opr,
     }
     case OPR_BAND: case OPR_BOR: case OPR_BXOR: {
       if (!constfolding(fs, opr + LUA_OPADD, e1, e2))
-        codebinexpval(fs, cast(OpCode, opr + OP_ADD), e1, e2, line);
+        codebitwise(fs, opr, e1, e2, line);
       break;
     }
     case OPR_SHL: {

ldebug.c

@@ -1,5 +1,5 @@
 /*
-** $Id: ldebug.c,v 2.146 2017/11/23 19:29:04 roberto Exp roberto $
+** $Id: ldebug.c,v 2.147 2017/12/07 15:44:10 roberto Exp roberto $
 ** Debug Interface
 ** See Copyright Notice in lua.h
 */
@@ -589,7 +589,8 @@ static const char *funcnamefromcode (lua_State *L, CallInfo *ci,
       tm = TM_NEWINDEX;
       break;
     case OP_ADDI: case OP_SUBI: case OP_MULI: case OP_MODI:
-    case OP_POWI: case OP_DIVI: case OP_IDIVI: {
+    case OP_POWI: case OP_DIVI: case OP_IDIVI:
+    case OP_BANDK: case OP_BORK: case OP_BXORK: {
       int offset = GET_OPCODE(i) - OP_ADDI;  /* ORDER OP */
       tm = cast(TMS, offset + TM_ADD);  /* ORDER TM */
       break;

lopcodes.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lopcodes.c,v 1.71 2017/11/29 16:57:36 roberto Exp roberto $
+** $Id: lopcodes.c,v 1.72 2017/12/04 17:41:30 roberto Exp roberto $
 ** Opcodes for Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -44,6 +44,9 @@ LUAI_DDEF const char *const luaP_opnames[NUM_OPCODES+1] = {
   "POWI",
   "DIVI",
   "IDIVI",
+  "BANDK",
+  "BORK",
+  "BXORK",
   "SHRI",
   "SHLI",
   "ADD",
@@ -119,6 +122,9 @@ LUAI_DDEF const lu_byte luaP_opmodes[NUM_OPCODES] = {
  ,opmode(0, 1, iABC)		/* OP_POWI */
  ,opmode(0, 1, iABC)		/* OP_DIVI */
  ,opmode(0, 1, iABC)		/* OP_IDIVI */
+ ,opmode(0, 1, iABC)		/* OP_BANDK */
+ ,opmode(0, 1, iABC)		/* OP_BORK */
+ ,opmode(0, 1, iABC)		/* OP_BXORK */
  ,opmode(0, 1, iABC)		/* OP_SHRI */
  ,opmode(0, 1, iABC)		/* OP_SHLI */
  ,opmode(0, 1, iABC)		/* OP_ADD */

lopcodes.h

@@ -1,5 +1,5 @@
 /*
-** $Id: lopcodes.h,v 1.175 2017/11/30 13:16:43 roberto Exp roberto $
+** $Id: lopcodes.h,v 1.176 2017/12/04 17:41:30 roberto Exp roberto $
 ** Opcodes for Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -217,6 +217,10 @@ OP_POWI,/*	A B sC	R(A) := R(B) ^ C				*/
 OP_DIVI,/*	A B sC	R(A) := R(B) / C				*/
 OP_IDIVI,/*	A B sC	R(A) := R(B) // C				*/
 
+OP_BANDK,/*	A B C	R(A) := R(B) & K(C):integer			*/
+OP_BORK,/*	A B C	R(A) := R(B) | K(C):integer			*/
+OP_BXORK,/*	A B C	R(A) := R(B) ~ K(C):integer			*/
+
 OP_SHRI,/*	A B C	R(A) := R(B) >> C				*/
 OP_SHLI,/*	A B C	R(A) := C << R(B)				*/
 

ltm.c

@@ -1,5 +1,5 @@
 /*
-** $Id: ltm.c,v 2.50 2017/11/27 17:44:31 roberto Exp roberto $
+** $Id: ltm.c,v 2.51 2017/11/30 15:37:16 roberto Exp roberto $
 ** Tag methods
 ** See Copyright Notice in lua.h
 */
@@ -166,15 +166,20 @@ void luaT_trybinTM (lua_State *L, const TValue *p1, const TValue *p2,
 }
 
 
+void luaT_trybinassocTM (lua_State *L, const TValue *p1, const TValue *p2,
+                                       StkId res, int inv, TMS event) {
+  if (inv)
+    luaT_trybinTM(L, p2, p1, res, event);
+  else
+    luaT_trybinTM(L, p1, p2, res, event);
+}
+
+
 void luaT_trybiniTM (lua_State *L, const TValue *p1, int i2,
                                    int inv, StkId res, TMS event) {
-  TValue aux; const TValue *p2;
+  TValue aux;
   setivalue(&aux, i2);
-  if (inv) {  /* arguments were exchanged? */
-    p2 = p1; p1 = &aux;  /* correct them */
-  }
-  else p2 = &aux;
-  luaT_trybinTM(L, p1, p2, res, event);
+  luaT_trybinassocTM(L, p1, &aux, res, inv, event);
 }
 
 

ltm.h

@@ -1,5 +1,5 @@
 /*
-** $Id: ltm.h,v 2.26 2017/09/27 18:59:08 roberto Exp roberto $
+** $Id: ltm.h,v 2.27 2017/11/27 17:44:31 roberto Exp roberto $
 ** Tag methods
 ** See Copyright Notice in lua.h
 */
@@ -68,6 +68,8 @@ LUAI_FUNC void luaT_callTMres (lua_State *L, const TValue *f,
                             const TValue *p1, const TValue *p2, StkId p3);
 LUAI_FUNC void luaT_trybinTM (lua_State *L, const TValue *p1, const TValue *p2,
                               StkId res, TMS event);
+LUAI_FUNC void luaT_trybinassocTM (lua_State *L, const TValue *p1,
+       const TValue *p2, StkId res, int inv, TMS event);
 LUAI_FUNC void luaT_trybiniTM (lua_State *L, const TValue *p1, int i2,
                                int inv, StkId res, TMS event);
 LUAI_FUNC int luaT_callorderTM (lua_State *L, const TValue *p1,

lvm.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lvm.c,v 2.323 2017/11/30 13:29:18 roberto Exp roberto $
+** $Id: lvm.c,v 2.324 2017/12/04 17:41:30 roberto Exp roberto $
 ** Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -687,6 +687,7 @@ void luaV_finishOp (lua_State *L) {
     case OP_MODI: case OP_POWI:
     case OP_ADD: case OP_SUB:
     case OP_MUL: case OP_DIV: case OP_IDIV:
+    case OP_BANDK: case OP_BORK: case OP_BXORK:
     case OP_BAND: case OP_BOR: case OP_BXOR:
     case OP_SHRI: case OP_SHL: case OP_SHR:
     case OP_MOD: case OP_POW:
@@ -1182,6 +1183,39 @@ void luaV_execute (lua_State *L, CallInfo *ci) {
           Protect(luaT_trybinTM(L, rb, rc, ra, TM_DIV));
         vmbreak;
       }
+      vmcase(OP_BANDK) {
+        TValue *p1 = vRB(i);
+        TValue *p2 = KC(i);
+        lua_Integer i1;
+        if (tointegerns(p1, &i1)) {
+          setivalue(vra, intop(&, i1, ivalue(p2)));
+        }
+        else
+          Protect(luaT_trybinassocTM(L, p1, p2, ra, TESTARG_k(i), TM_BAND));
+        vmbreak;
+      }
+      vmcase(OP_BORK) {
+        TValue *p1 = vRB(i);
+        TValue *p2 = KC(i);
+        lua_Integer i1;
+        if (tointegerns(p1, &i1)) {
+          setivalue(vra, intop(|, i1, ivalue(p2)));
+        }
+        else
+          Protect(luaT_trybinassocTM(L, p1, p2, ra, TESTARG_k(i), TM_BOR));
+        vmbreak;
+      }
+      vmcase(OP_BXORK) {
+        TValue *p1 = vRB(i);
+        TValue *p2 = KC(i);
+        lua_Integer i1;
+        if (tointegerns(p1, &i1)) {
+          setivalue(vra, intop(^, i1, ivalue(p2)));
+        }
+        else
+          Protect(luaT_trybinassocTM(L, p1, p2, ra, TESTARG_k(i), TM_BXOR));
+        vmbreak;
+      }
       vmcase(OP_BAND) {
         TValue *rb = vRB(i);
         TValue *rc = vRC(i);