simpler way to check maximum gc threshold

lapi.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lapi.c,v 1.234 2003/04/03 13:35:34 roberto Exp roberto $
+** $Id: lapi.c,v 1.235 2003/04/07 14:36:08 roberto Exp roberto $
 ** Lua API
 ** See Copyright Notice in lua.h
 */
@@ -759,10 +759,11 @@ LUA_API int lua_dump (lua_State *L, lua_Chunkwriter writer, void *data) {
 */
 
 /* GC values are expressed in Kbytes: #bytes/2^10 */
-#define GCscalel(x)		((x)>>10)
-#define GCscale(x)		(cast(int, GCscalel(x)))
+#define GCscale(x)		(cast(int, (x)>>10))
 #define GCunscale(x)		(cast(lu_mem, x)<<10)
 
+#define MAX_THRESHOLD	(cast(lu_mem, ~0) >> 10)
+
 LUA_API int lua_getgcthreshold (lua_State *L) {
   int threshold;
   lua_lock(L);
@@ -781,10 +782,9 @@ LUA_API int lua_getgccount (lua_State *L) {
 
 LUA_API void lua_setgcthreshold (lua_State *L, int newthreshold) {
   lua_lock(L);
-  if (cast(lu_mem, newthreshold) > GCscalel(MAX_LUMEM))
-    G(L)->GCthreshold = MAX_LUMEM;
-  else
-    G(L)->GCthreshold = GCunscale(newthreshold);
+  if (cast(lu_mem, newthreshold) > MAX_THRESHOLD)
+    newthreshold = cast(int, MAX_THRESHOLD);
+  G(L)->GCthreshold = GCunscale(newthreshold);
   luaC_checkGC(L);
   lua_unlock(L);
 }