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small optimization in opcodes for "and" and "or"

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This commit is contained in:
Roberto Ierusalimschy 1997-08-04 16:15:05 -03:00
parent abbf14cd32
commit dd1aa28390
4 changed files with 16 additions and 30 deletions
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6
lua.stx
View File

@ -1,6 +1,6 @@
%{
char *rcs_luastx = "$Id: lua.stx,v 3.49 1997/07/30 22:00:50 roberto Exp roberto $";
char *rcs_luastx = "$Id: lua.stx,v 3.50 1997/07/31 20:46:59 roberto Exp roberto $";
#include <stdlib.h>
@ -660,12 +660,12 @@ expr : '(' expr ')' { $$ = $2; }
| NIL {code_byte(PUSHNIL); $$ = 0; }
| functioncall { $$ = $1; }
| NOT expr1 { code_byte(NOTOP); $$ = 0;}
| expr1 AND PrepJump {code_byte(POP); } expr1
| expr1 AND PrepJump expr1
{
code_shortcircuit($3, ONFJMP);
$$ = 0;
}
| expr1 OR PrepJump {code_byte(POP); } expr1
| expr1 OR PrepJump expr1
{
code_shortcircuit($3, ONTJMP);
$$ = 0;

6
opcode.c
View File

@ -3,7 +3,7 @@
** TecCGraf - PUC-Rio
*/
char *rcs_opcode="$Id: opcode.c,v 4.20 1997/07/30 22:00:50 roberto Exp roberto $";
char *rcs_opcode="$Id: opcode.c,v 4.21 1997/07/31 19:37:37 roberto Exp roberto $";
#include <setjmp.h>
#include <stdio.h>
@ -1384,6 +1384,7 @@ static StkId lua_execute (TFunc *func, StkId base)
Word w;
get_word(w,pc);
if (ttype(top-1) != LUA_T_NIL) pc += w;
else top--;
}
break;
@ -1392,6 +1393,7 @@ static StkId lua_execute (TFunc *func, StkId base)
Word w;
get_word(w,pc);
if (ttype(top-1) == LUA_T_NIL) pc += w;
else top--;
}
break;
@ -1429,8 +1431,6 @@ static StkId lua_execute (TFunc *func, StkId base)
}
break;
case POP: --top; break;
case CALLFUNC:
{
int nParams = *(pc++);

15
opcode.h
View File

@ -1,6 +1,6 @@
/*
** TeCGraf - PUC-Rio
** $Id: opcode.h,v 3.36 1997/07/29 20:38:06 roberto Exp roberto $
** $Id: opcode.h,v 3.37 1997/07/30 22:00:50 roberto Exp roberto $
*/
#ifndef opcode_h
@ -60,7 +60,7 @@ PUSHLOCAL9,/* - LOC[9] */
PUSHLOCAL,/* b - LOC[b] */
PUSHGLOBAL,/* w - VAR[w] */
PUSHINDEXED,/* i t t[i] */
PUSHSELF,/* w t t t[STR[w]] */
PUSHSELF,/* w t t t[CNST[w]] */
STORELOCAL0,/* x - LOC[0]=x */
STORELOCAL1,/* x - LOC[1]=x */
STORELOCAL2,/* x - LOC[2]=x */
@ -78,7 +78,7 @@ STOREINDEXED,/* b v a_b...a_1 i t a_b...a_1 i t t[i]=v */
STORELIST0,/* b v_b...v_1 t - t[i]=v_i */
STORELIST,/* b c v_b...v_1 t - t[i+c*FPF]=v_i */
STORERECORD,/* b
w_b...w_1 v_b...v_1 t - t[STR[w_i]]=v_i */
w_b...w_1 v_b...v_1 t - t[CNST[w_i]]=v_i */
ADJUST0,/* - - TOP=BASE */
ADJUST,/* b - - TOP=BASE+b */
CREATEARRAY,/* w - newarray(size = w) */
@ -95,21 +95,20 @@ POWOP,/* y x x^y */
CONCOP,/* y x x..y */
MINUSOP,/* x -x */
NOTOP,/* x (x==nil)? 1 : nil */
ONTJMP,/* w x - (x!=nil)? PC+=w */
ONFJMP,/* w x - (x==nil)? PC+=w */
ONTJMP,/* w x (x!=nil)? x : - (x!=nil)? PC+=w */
ONFJMP,/* w x (x==nil)? x : - (x==nil)? PC+=w */
JMP,/* w - - PC+=w */
UPJMP,/* w - - PC-=w */
IFFJMP,/* w x - (x==nil)? PC+=w */
IFFUPJMP,/* w x - (x==nil)? PC-=w */
POP,/* x - */
CALLFUNC,/* b c v_b...v_1 f r_c...r_1 f(v1,...,v_b) */
RETCODE0,
RETCODE,/* b - - */
SETLINE,/* w - - LINE=w */
VARARGS,/* b v_b...v_1 {v_1...v_b;n=b} */
STOREMAP,/* b v_b k_b ...v_1 k_1 t - t[k_i]=v_i */
PUSHCONSTANTB,/*b - const[b] */
PUSHCONSTANT,/* w - const[w] */
PUSHCONSTANTB,/*b - CNST[b] */
PUSHCONSTANT,/* w - CNST[w] */
ENDCODE = 127
} OpCode;

19
undump.c
View File

@ -3,7 +3,7 @@
** load bytecodes from files
*/
char* rcs_undump="$Id: undump.c,v 1.24 1997/06/17 18:19:17 roberto Exp roberto $";
char* rcs_undump="$Id: undump.c,v 1.25 1997/07/29 19:44:02 roberto Exp roberto $";
#include <stdio.h>
#include <string.h>
@ -67,7 +67,6 @@ static void FixCode(Byte* code, Byte* end) /* swap words */
case CONCOP:
case MINUSOP:
case NOTOP:
case POP:
case RETCODE0:
p++;
break;
@ -86,9 +85,6 @@ static void FixCode(Byte* code, Byte* end) /* swap words */
case CALLFUNC:
p+=3;
break;
case PUSHFUNCTION:
p+=5; /* TODO: use sizeof(TFunc*) or old? */
break;
case PUSHWORD:
case PUSHSELF:
case CREATEARRAY:
@ -99,7 +95,6 @@ static void FixCode(Byte* code, Byte* end) /* swap words */
case IFFJMP:
case IFFUPJMP:
case SETLINE:
case PUSHSTRING:
case PUSHGLOBAL:
case STOREGLOBAL:
{
@ -108,14 +103,6 @@ static void FixCode(Byte* code, Byte* end) /* swap words */
p+=3;
break;
}
case PUSHFLOAT: /* assumes sizeof(float)==4 */
{
Byte t;
t=p[1]; p[1]=p[4]; p[4]=t;
t=p[2]; p[2]=p[3]; p[3]=t;
p+=5;
break;
}
case STORERECORD:
{
int n=*++p;
@ -226,7 +213,7 @@ static void LoadFunction(ZIO* Z)
{
int i=LoadWord(Z);
char* s=LoadString(Z);
int v=luaI_findconstantbyname(s);
int v; /*=luaI_findconstantbyname(s); ??????? */
Unthread(tf->code,i,v);
}
else
@ -324,7 +311,7 @@ int luaI_undump(ZIO* Z)
while ((m=luaI_undump1(Z)))
{
int status=luaI_dorun(m);
luaI_freefunc(m);
/* luaI_freefunc(m); ???*/
if (status!=0) return status;
}
return 0;