lua

commit c1de1fdac6a7873f8ae016785f364c5ae10abb1e
parent a36c8e1718fd32ea99e29797e5124600a16ccc03
Author: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date:   Thu, 18 Jun 2009 13:36:16 -0300

small optimization in 'lua_arith' (avoids overhead in the common case
of both arguments being numbers)

Diffstat:
M
lapi.c
 | 
8
++++++--

1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/lapi.c b/lapi.c
@@ -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
 ** See Copyright Notice in lua.h
 */
@@ -278,7 +278,11 @@ LUA_API int lua_rawequal (lua_State *L, int index1, int index2) {
 LUA_API void  lua_arith (lua_State *L, int op) {
   lua_lock(L);
   api_checknelems(L, 2);
-  luaV_arith(L, L->top - 2, L->top - 2, L->top - 1, op - LUA_OPADD + TM_ADD);
+  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);
   L->top--;
   lua_unlock(L);
 }