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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
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@@ -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;