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small optimization in 'lua_arith' (avoids overhead in the common case 

of both arguments being numbers)
This commit is contained in:
Roberto Ierusalimschy 2009-06-18 13:36:40 -03:00
parent a36c8e1718
commit c1de1fdac6
1 changed files with 6 additions and 2 deletions
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6
lapi.c
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@ -1,5 +1,5 @@
/* /*
** $Id: lapi.c,v 2.80 2009/06/17 17:52:57 roberto Exp roberto $ ** $Id: lapi.c,v 2.81 2009/06/17 18:38:54 roberto Exp roberto $
** Lua API ** Lua API
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -278,6 +278,10 @@ LUA_API int lua_rawequal (lua_State *L, int index1, int index2) {
LUA_API void lua_arith (lua_State *L, int op) { LUA_API void lua_arith (lua_State *L, int op) {
lua_lock(L); lua_lock(L);
api_checknelems(L, 2); api_checknelems(L, 2);
if (ttisnumber(L->top - 2) && ttisnumber(L->top - 1))
changenvalue(L->top - 2,
luaO_arith(op, nvalue(L->top - 2), nvalue(L->top - 1)));
else
luaV_arith(L, L->top - 2, L->top - 2, L->top - 1, op - LUA_OPADD + TM_ADD); luaV_arith(L, L->top - 2, L->top - 2, L->top - 1, op - LUA_OPADD + TM_ADD);
L->top--; L->top--;
lua_unlock(L); lua_unlock(L);