small optimizations for table access

lbuiltin.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lbuiltin.c,v 1.105 2000/04/14 17:44:20 roberto Exp roberto $
+** $Id: lbuiltin.c,v 1.106 2000/04/17 19:23:12 roberto Exp roberto $
 ** Built-in functions
 ** See Copyright Notice in lua.h
 */
@@ -321,7 +321,7 @@ void luaB_call (lua_State *L) {
   /* push arg[1...n] */
   luaD_checkstack(L, narg);
   for (i=0; i<narg; i++)
-    *(L->top++) = *luaH_getint(L, arg, i+1);
+    *(L->top++) = *luaH_getnum(arg, i+1);
   status = lua_callfunction(L, f);
   if (err != LUA_NOOBJECT) {  /* restore old error method */
     lua_pushobject(L, err);
@@ -434,7 +434,7 @@ void luaB_foreachi (lua_State *L) {
   for (i=1; i<=n; i++) {
     *(L->top++) = *f;
     ttype(L->top) = TAG_NUMBER; nvalue(L->top++) = i;
-    *(L->top++) = *luaH_getint(L, t, i);
+    *(L->top++) = *luaH_getnum(t, i);
     luaD_call(L, L->top-3, 1);
     if (ttype(L->top-1) != TAG_NIL)
       return;
@@ -513,7 +513,7 @@ void luaB_tremove (lua_State *L) {
   int n = (int)getnarg(L, a);
   int pos = luaL_opt_int(L, 2, n);
   if (n <= 0) return;  /* table is "empty" */
-  luaA_pushobject(L, luaH_getint(L, a, pos));  /* result = a[pos] */
+  luaA_pushobject(L, luaH_getnum(a, pos));  /* result = a[pos] */
   for ( ;pos<n; pos++)
     luaH_move(L, a, pos+1, pos);  /* a[pos] = a[pos+1] */
   luaV_setn(L, a, n-1);  /* a.n = n-1 */
@@ -529,7 +529,7 @@ void luaB_tremove (lua_State *L) {
 
 static void swap (lua_State *L, Hash *a, int i, int j) {
   TObject temp;
-  temp = *luaH_getint(L, a, i);
+  temp = *luaH_getnum(a, i);
   luaH_move(L, a, j, i);
   luaH_setint(L, a, j, &temp);
 }
@@ -556,26 +556,26 @@ static void auxsort (lua_State *L, Hash *a, int l, int u, lua_Object f) {
   while (l < u) {  /* for tail recursion */
     int i, j;
     /* sort elements a[l], a[(l+u)/2] and a[u] */
-    if (sort_comp(L, f, luaH_getint(L, a, u), luaH_getint(L, a, l)))
+    if (sort_comp(L, f, luaH_getnum(a, u), luaH_getnum(a, l)))
       swap(L, a, l, u);  /* a[u]<a[l] */
     if (u-l == 1) break;  /* only 2 elements */
     i = (l+u)/2;
-    *P = *luaH_getint(L, a, i);  /* P = a[i] */
+    *P = *luaH_getnum(a, i);  /* P = a[i] */
-    if (sort_comp(L, f, P, luaH_getint(L, a, l)))  /* a[i]<a[l]? */
+    if (sort_comp(L, f, P, luaH_getnum(a, l)))  /* a[i]<a[l]? */
       swap(L, a, l, i);
-    else if (sort_comp(L, f, luaH_getint(L, a, u), P))  /* a[u]<a[i]? */
+    else if (sort_comp(L, f, luaH_getnum(a, u), P))  /* a[u]<a[i]? */
       swap(L, a, i, u);
     if (u-l == 2) break;  /* only 3 elements */
-    *P = *luaH_getint(L, a, i);  /* save pivot on stack (GC) */
+    *P = *luaH_getnum(a, i);  /* save pivot on stack (GC) */
     swap(L, a, i, u-1);  /* put median element as pivot (a[u-1]) */
     /* a[l] <= P == a[u-1] <= a[u], only needs to sort from l+1 to u-2 */
     i = l; j = u-1;
     for (;;) {  /* invariant: a[l..i] <= P <= a[j..u] */
       /* repeat i++ until a[i] >= P */
-      while (sort_comp(L, f, luaH_getint(L, a, ++i), P))
+      while (sort_comp(L, f, luaH_getnum(a, ++i), P))
         if (i>u) lua_error(L, "invalid order function for sorting");
       /* repeat j-- until a[j] <= P */
-      while (sort_comp(L, f, P, luaH_getint(L, a, --j)))
+      while (sort_comp(L, f, P, luaH_getnum(a, --j)))
         if (j<l) lua_error(L, "invalid order function for sorting");
       if (j<i) break;
       swap(L, a, i, j);

lobject.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lobject.c,v 1.35 2000/03/29 20:19:20 roberto Exp roberto $
+** $Id: lobject.c,v 1.36 2000/03/31 16:28:45 roberto Exp roberto $
 ** Some generic functions over Lua objects
 ** See Copyright Notice in lua.h
 */
@@ -32,7 +32,8 @@ unsigned long luaO_power2 (unsigned long n) {
 }
 
 
-int luaO_equalval (const TObject *t1, const TObject *t2) {
+int luaO_equalObj (const TObject *t1, const TObject *t2) {
+  if (ttype(t1) != ttype(t2)) return 0;
   switch (ttype(t1)) {
     case TAG_NUMBER:
       return nvalue(t1) == nvalue(t2);

lobject.h

@@ -1,5 +1,5 @@
 /*
-** $Id: lobject.h,v 1.59 2000/03/31 16:28:45 roberto Exp roberto $
+** $Id: lobject.h,v 1.60 2000/04/10 19:20:24 roberto Exp roberto $
 ** Type definitions for Lua objects
 ** See Copyright Notice in lua.h
 */
@@ -180,8 +180,7 @@ extern const TObject luaO_nilobject;
 
 unsigned long luaO_power2 (unsigned long n);
 
-#define luaO_equalObj(t1,t2)  (ttype(t1) == ttype(t2) && luaO_equalval(t1,t2))
+int luaO_equalObj (const TObject *t1, const TObject *t2);
-int luaO_equalval (const TObject *t1, const TObject *t2);
 int luaO_redimension (lua_State *L, int oldsize);
 int luaO_str2d (const char *s, Number *result);
 

ltable.c

@@ -1,5 +1,5 @@
 /*
-** $Id: ltable.c,v 1.38 2000/03/29 20:19:20 roberto Exp roberto $
+** $Id: ltable.c,v 1.39 2000/03/31 16:28:45 roberto Exp roberto $
 ** Lua tables (hash)
 ** See Copyright Notice in lua.h
 */
@@ -60,11 +60,12 @@ Node *luaH_mainposition (const Hash *t, const TObject *key) {
   }
   LUA_ASSERT(L, h%(unsigned int)t->size == (h&((unsigned int)t->size-1)),
             "a&(x-1) == a%x, for x power of 2");
-  return &t->node[h&((unsigned int)t->size-1)];
+  return &t->node[h&(t->size-1)];
 }
 
 
-const TObject *luaH_get (lua_State *L, const Hash *t, const TObject *key) {
+static const TObject *luaH_getany (lua_State *L, const Hash *t,
+                                   const TObject *key) {
   Node *n = luaH_mainposition(t, key);
   if (!n)
     lua_error(L, "unexpected type to index table");
@@ -77,6 +78,39 @@ const TObject *luaH_get (lua_State *L, const Hash *t, const TObject *key) {
 }
 
 
+/* specialized version for numbers */
+const TObject *luaH_getnum (const Hash *t, Number key) {
+  Node *n = &t->node[(unsigned long)(long)key&(t->size-1)];
+  do {
+    if (ttype(&n->key) == TAG_NUMBER && nvalue(&n->key) == key)
+      return &n->val;
+    n = n->next;
+  } while (n);
+  return &luaO_nilobject;  /* key not found */
+}
+
+
+/* specialized version for strings */
+static const TObject *luaH_getstr (const Hash *t, TString *key) {
+  Node *n = &t->node[key->hash&(t->size-1)];
+  do {
+    if (ttype(&n->key) == TAG_STRING && tsvalue(&n->key) == key)
+      return &n->val;
+    n = n->next;
+  } while (n);
+  return &luaO_nilobject;  /* key not found */
+}
+
+
+const TObject *luaH_get (lua_State *L, const Hash *t, const TObject *key) {
+  switch (ttype(key)) {
+    case TAG_NUMBER: return luaH_getnum(t, nvalue(key));
+    case TAG_STRING: return luaH_getstr(t, tsvalue(key));
+    default:         return luaH_getany(L, t, key);
+  }
+}
+
+
 int luaH_pos (lua_State *L, const Hash *t, const TObject *key) {
   const TObject *v = luaH_get(L, t, key);
   return (v == &luaO_nilobject) ?  -1 :  /* key not found */
@@ -214,11 +248,3 @@ void luaH_setint (lua_State *L, Hash *t, int key, const TObject *val) {
   luaH_set(L, t, &index, val);
 }
 
-
-const TObject *luaH_getint (lua_State *L, const Hash *t, int key) {
-  TObject index;
-  ttype(&index) = TAG_NUMBER;
-  nvalue(&index) = key;
-  return luaH_get(L, t, &index);
-}
-

ltable.h

@@ -1,5 +1,5 @@
 /*
-** $Id: ltable.h,v 1.17 1999/11/23 13:58:02 roberto Exp roberto $
+** $Id: ltable.h,v 1.18 1999/12/07 12:05:34 roberto Exp roberto $
 ** Lua tables (hash)
 ** See Copyright Notice in lua.h
 */
@@ -14,7 +14,7 @@
 #define key(n)		(&(n)->key)
 #define val(n)		(&(n)->val)
 
-#define luaH_move(L, t,from,to)	(luaH_setint(L, t, to, luaH_getint(L, t, from)))
+#define luaH_move(L, t,from,to)	(luaH_setint(L, t, to, luaH_getnum(t, from)))
 
 Hash *luaH_new (lua_State *L, int nhash);
 void luaH_free (lua_State *L, Hash *t);
@@ -22,7 +22,7 @@ const TObject *luaH_get (lua_State *L, const Hash *t, const TObject *key);
 void luaH_set (lua_State *L, Hash *t, const TObject *key, const TObject *val);
 int luaH_pos (lua_State *L, const Hash *t, const TObject *r);
 void luaH_setint (lua_State *L, Hash *t, int key, const TObject *val);
-const TObject *luaH_getint (lua_State *L, const Hash *t, int key);
+const TObject *luaH_getnum (const Hash *t, Number key);
 unsigned long luaH_hash (lua_State *L, const TObject *key);
 
 /* exported only for debugging */