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https://github.com/lua/lua
synced 2024-12-27 12:49:43 +03:00
more optimizations
This commit is contained in:
Roberto Ierusalimschy
parent
14251c5a56
commit
031978798c
55
lcode.c
55
lcode.c
@ -1,5 +1,5 @@
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/*
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** $Id: lcode.c,v 1.20 2000/04/05 17:51:58 roberto Exp roberto $
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** $Id: lcode.c,v 1.21 2000/04/06 17:36:52 roberto Exp roberto $
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** Code generator for Lua
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** See Copyright Notice in lua.h
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*/
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@ -88,9 +88,11 @@ static void luaK_minus (FuncState *fs) {
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static void luaK_gettable (FuncState *fs) {
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/* PUSHSTRING u; GETTABLE -> GETDOTTED u (t.x) */
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/* GETLOCAL u; GETTABLE -> GETINDEXED u (t[i]) */
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Instruction previous = prepare(fs, CREATE_0(OP_GETTABLE), -1);
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switch(GET_OPCODE(previous)) {
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case OP_PUSHSTRING: SET_OPCODE(previous, OP_GETDOTTED); break;
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case OP_GETLOCAL: SET_OPCODE(previous, OP_GETINDEXED); break;
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default: return;
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}
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setprevious(fs, previous);
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@ -123,22 +125,32 @@ static void luaK_sub (FuncState *fs) {
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static void luaK_conc (FuncState *fs) {
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/* CONC u; CONC 2 -> CONC u+1 (a..b..c) */
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Instruction previous = prepare(fs, CREATE_U(OP_CONC, 2), -1);
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/* CONCAT u; CONCAT 2 -> CONCAT u+1 (a..b..c) */
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Instruction previous = prepare(fs, CREATE_U(OP_CONCAT, 2), -1);
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switch(GET_OPCODE(previous)) {
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case OP_CONC: SETARG_U(previous, GETARG_U(previous)+1); break;
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case OP_CONCAT: SETARG_U(previous, GETARG_U(previous)+1); break;
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default: return;
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}
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setprevious(fs, previous);
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}
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static void luaK_getlocal (FuncState *fs, int l) {
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/* SETLOCAL l 1; GETLOCAL l -> SETLOCAL l 0 */
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Instruction previous = prepare(fs, CREATE_U(OP_GETLOCAL, l), 1);
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if (previous == CREATE_AB(OP_SETLOCAL, l, 1)) {
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SETARG_B(previous, 0);
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setprevious(fs, previous);
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}
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}
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static void luaK_setlocal (FuncState *fs, int l) {
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/* PUSHLOCAL l; ADDI k, SETLOCAL l -> INCLOCAL k, l ((local)a=a+k) */
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/* GETLOCAL l; ADDI k, SETLOCAL l -> INCLOCAL k, l ((local)a=a+k) */
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Instruction *code = fs->f->code;
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int pc = fs->pc;
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if (pc-1 > fs->lasttarget && /* no jumps in-between instructions? */
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code[pc-2] == CREATE_U(OP_PUSHLOCAL, l) &&
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code[pc-2] == CREATE_U(OP_GETLOCAL, l) &&
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GET_OPCODE(code[pc-1]) == OP_ADDI &&
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abs(GETARG_S(code[pc-1])) <= MAXARG_sA) {
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int inc = GETARG_S(code[pc-1]);
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@ -147,7 +159,7 @@ static void luaK_setlocal (FuncState *fs, int l) {
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luaK_deltastack(fs, -1);
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}
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else
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luaK_U(fs, OP_SETLOCAL, l, -1);
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luaK_AB(fs, OP_SETLOCAL, l, 1, -1);
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}
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@ -162,8 +174,8 @@ static void luaK_eq (FuncState *fs) {
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static void luaK_neq (FuncState *fs) {
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/* PUSHNIL 1; JMPNEQ -> JMPT (a~=nil) */
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Instruction previous = prepare(fs, CREATE_S(OP_JMPNEQ, NO_JUMP), -2);
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/* PUSHNIL 1; JMPNE -> JMPT (a~=nil) */
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Instruction previous = prepare(fs, CREATE_S(OP_JMPNE, NO_JUMP), -2);
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if (previous == CREATE_U(OP_PUSHNIL, 1)) {
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setprevious(fs, CREATE_S(OP_JMPT, NO_JUMP));
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}
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@ -201,6 +213,17 @@ static void luaK_pushnil (FuncState *fs, int n) {
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}
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static void luaK_pop (FuncState *fs, int n) {
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Instruction previous = prepare(fs, CREATE_U(OP_POP, n), -n);
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switch(GET_OPCODE(previous)) {
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case OP_SETTABLE: SETARG_B(previous, GETARG_B(previous)+n); break;
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case OP_SETLOCAL: SETARG_B(previous, GETARG_B(previous)+n); break;
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default: return;
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}
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setprevious(fs, previous);
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}
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static void luaK_fixjump (FuncState *fs, int pc, int dest) {
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Instruction *jmp = &fs->f->code[pc];
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if (dest == NO_JUMP)
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@ -280,7 +303,7 @@ void luaK_number (FuncState *fs, Number f) {
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void luaK_adjuststack (FuncState *fs, int n) {
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if (n > 0)
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luaK_U(fs, OP_POP, n, -n);
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luaK_pop(fs, n);
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else if (n < 0)
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luaK_pushnil(fs, -n);
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}
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@ -311,7 +334,7 @@ static void assertglobal (FuncState *fs, int index) {
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static int discharge (FuncState *fs, expdesc *var) {
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switch (var->k) {
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case VLOCAL:
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luaK_U(fs, OP_PUSHLOCAL, var->u.index, 1);
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luaK_getlocal(fs, var->u.index);
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break;
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case VGLOBAL:
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luaK_U(fs, OP_GETGLOBAL, var->u.index, 1);
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@ -347,8 +370,8 @@ void luaK_storevar (LexState *ls, const expdesc *var) {
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luaK_U(fs, OP_SETGLOBAL, var->u.index, -1);
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assertglobal(fs, var->u.index); /* make sure that there is a global */
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break;
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case VINDEXED:
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luaK_0(fs, OP_SETTABLEPOP, -3);
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case VINDEXED: /* table is at top-3; pop 3 elements after operation */
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luaK_AB(fs, OP_SETTABLE, 3, 3, -3);
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break;
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default:
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LUA_INTERNALERROR(ls->L, "invalid var kind to store");
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@ -358,8 +381,8 @@ void luaK_storevar (LexState *ls, const expdesc *var) {
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static OpCode invertjump (OpCode op) {
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switch (op) {
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case OP_JMPNEQ: return OP_JMPEQ;
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case OP_JMPEQ: return OP_JMPNEQ;
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case OP_JMPNE: return OP_JMPEQ;
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case OP_JMPEQ: return OP_JMPNE;
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case OP_JMPLT: return OP_JMPGE;
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case OP_JMPLE: return OP_JMPGT;
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case OP_JMPGT: return OP_JMPLE;
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@ -566,7 +589,7 @@ void luaK_posfix (LexState *ls, int op, expdesc *v1, expdesc *v2) {
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case '*': luaK_0(fs, OP_MULT, -1); break;
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case '/': luaK_0(fs, OP_DIV, -1); break;
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case '^': luaK_0(fs, OP_POW, -1); break;
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case TK_CONC: luaK_conc(fs); break;
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case TK_CONCAT: luaK_conc(fs); break;
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case TK_EQ: luaK_eq(fs); break;
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case TK_NE: luaK_neq(fs); break;
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case '>': luaK_S(fs, OP_JMPGT, NO_JUMP, -2); break;
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14
lparser.c
14
lparser.c
@ -1,5 +1,5 @@
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/*
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** $Id: lparser.c,v 1.76 2000/04/05 17:51:58 roberto Exp roberto $
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** $Id: lparser.c,v 1.77 2000/04/06 17:36:52 roberto Exp roberto $
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** LL(1) Parser and code generator for Lua
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** See Copyright Notice in lua.h
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*/
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@ -751,7 +751,7 @@ static int get_priority (int op, int *rp) {
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case '+': case '-': *rp = 5; return 5;
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case TK_CONC: *rp = 3; return 4; /* right associative (?) */
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case TK_CONCAT: *rp = 3; return 4; /* right associative (?) */
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case TK_EQ: case TK_NE: case '>': case '<': case TK_LE: case TK_GE:
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*rp = 2; return 2;
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@ -832,13 +832,11 @@ static int assignment (LexState *ls, expdesc *v, int nvars) {
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nexps = explist1(ls);
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adjust_mult_assign(ls, nvars, nexps);
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}
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if (v->k != VINDEXED || left+(nvars-1) == 0) {
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/* global/local var or indexed var without values in between */
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if (v->k != VINDEXED)
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luaK_storevar(ls, v);
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}
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else { /* indexed var with values in between*/
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luaK_U(ls->fs, OP_SETTABLE, left+(nvars-1), -1);
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left += 2; /* table&index are not popped, because they aren't on top */
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else { /* there may be garbage between table-index and value */
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luaK_AB(ls->fs, OP_SETTABLE, left+nvars+2, 1, -1);
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left += 2;
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}
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return left;
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}
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44
lvm.c
44
lvm.c
@ -1,5 +1,5 @@
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/*
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** $Id: lvm.c,v 1.98 2000/03/29 20:19:20 roberto Exp roberto $
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** $Id: lvm.c,v 1.99 2000/04/04 20:48:44 roberto Exp roberto $
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** Lua virtual machine
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** See Copyright Notice in lua.h
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*/
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@ -231,6 +231,13 @@ static void call_arith (lua_State *L, StkId top, IMS event) {
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}
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static void addK (lua_State *L, StkId top, int k) {
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ttype(top) = TAG_NUMBER;
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nvalue(top) = (Number)k;
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call_arith(L, top+1, IM_ADD);
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}
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static int luaV_strcomp (const TString *ls, const TString *rs) {
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const char *l = ls->str;
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long ll = ls->u.s.len;
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@ -403,7 +410,7 @@ StkId luaV_execute (lua_State *L, const Closure *cl, register StkId base) {
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*top++ = cl->consts[GETARG_U(i)];
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break;
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case OP_PUSHLOCAL:
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case OP_GETLOCAL:
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*top++ = *(base+GETARG_U(i));
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break;
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@ -424,6 +431,12 @@ StkId luaV_execute (lua_State *L, const Closure *cl, register StkId base) {
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top--;
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break;
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case OP_GETINDEXED:
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*top++ = *(base+GETARG_U(i));
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luaV_gettable(L, top);
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top--;
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break;
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case OP_PUSHSELF: {
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TObject receiver;
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receiver = *(top-1);
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@ -443,7 +456,8 @@ StkId luaV_execute (lua_State *L, const Closure *cl, register StkId base) {
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break;
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case OP_SETLOCAL:
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*(base+GETARG_U(i)) = *(--top);
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*(base+GETARG_A(i)) = *(top-1);
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top -= GETARG_B(i);
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break;
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case OP_SETGLOBAL:
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@ -451,14 +465,9 @@ StkId luaV_execute (lua_State *L, const Closure *cl, register StkId base) {
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top--;
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break;
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case OP_SETTABLEPOP:
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luaV_settable(L, top-3, top);
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top -= 3; /* pop table, index, and value */
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break;
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case OP_SETTABLE:
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luaV_settable(L, top-3-GETARG_U(i), top);
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top--; /* pop value */
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luaV_settable(L, top-GETARG_A(i), top);
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top -= GETARG_B(i); /* pop values */
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break;
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case OP_SETLIST: {
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@ -496,9 +505,7 @@ StkId luaV_execute (lua_State *L, const Closure *cl, register StkId base) {
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int n = GETARG_sA(i);
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if (tonumber(var)) {
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*top = *var; /* PUSHLOCAL */
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ttype(top+1) = TAG_NUMBER;
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nvalue(top+1) = (Number)n; /* PUSHINT */
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call_arith(L, top+2, IM_ADD);
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addK(L, top+1, n);
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*var = *top; /* SETLOCAL */
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}
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else
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@ -507,11 +514,8 @@ StkId luaV_execute (lua_State *L, const Closure *cl, register StkId base) {
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}
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case OP_ADDI:
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if (tonumber(top-1)) {
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ttype(top) = TAG_NUMBER;
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nvalue(top) = (Number)GETARG_S(i);
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call_arith(L, top+1, IM_ADD);
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}
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if (tonumber(top-1))
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addK(L, top, GETARG_S(i));
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else
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nvalue(top-1) += (Number)GETARG_S(i);
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break;
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@ -545,7 +549,7 @@ StkId luaV_execute (lua_State *L, const Closure *cl, register StkId base) {
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top--;
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break;
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case OP_CONC: {
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case OP_CONCAT: {
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int n = GETARG_U(i);
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strconc(L, n, top);
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top -= n-1;
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@ -569,7 +573,7 @@ StkId luaV_execute (lua_State *L, const Closure *cl, register StkId base) {
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nvalue(top-1) = 1;
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break;
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case OP_JMPNEQ:
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case OP_JMPNE:
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top -= 2;
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if (!luaO_equalObj(top, top+1)) pc += GETARG_S(i);
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break;
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