mirrors/lua
1
0
Fork 0
mirror of https://github.com/lua/lua synced 2024-11-25 22:29:39 +03:00
Code Issues Packages Projects Releases Wiki Activity

small optimization for local declarations without initializations

Browse Source
This commit is contained in:
Roberto Ierusalimschy 2005-09-30 11:23:33 -03:00
parent ede19c9138
commit 5dbb870815
1 changed files with 12 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
lcode.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lcode.c,v 2.15 2005/08/17 18:32:09 roberto Exp $
** $Id: lcode.c,v 2.16 2005/08/29 20:49:21 roberto Exp roberto $
** Code generator for Lua
** See Copyright Notice in lua.h
*/
@ -29,14 +29,17 @@
void luaK_nil (FuncState *fs, int from, int n) {
Instruction *previous;
if (fs->pc > fs->lasttarget && /* no jumps to current position? */
GET_OPCODE(*(previous = &fs->f->code[fs->pc-1])) == OP_LOADNIL) {
int pfrom = GETARG_A(*previous);
int pto = GETARG_B(*previous);
if (pfrom <= from && from <= pto+1) { /* can connect both? */
if (from+n-1 > pto)
SETARG_B(*previous, from+n-1);
return;
if (fs->pc > fs->lasttarget) { /* no jumps to current position? */
if (fs->pc == 0) /* function start? */
return; /* positions are already clean */
if (GET_OPCODE(*(previous = &fs->f->code[fs->pc-1])) == OP_LOADNIL) {
int pfrom = GETARG_A(*previous);
int pto = GETARG_B(*previous);
if (pfrom <= from && from <= pto+1) { /* can connect both? */
if (from+n-1 > pto)
SETARG_B(*previous, from+n-1);
return;
}
}
}
luaK_codeABC(fs, OP_LOADNIL, from, from+n-1, 0); /* else no optimization */