small reorganization of 'luaV_flttointeger'/'luaV_tointeger'

lcode.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lcode.c,v 2.154 2018/02/15 15:34:29 roberto Exp roberto $
+** $Id: lcode.c,v 2.155 2018/02/17 19:20:00 roberto Exp roberto $
 ** Code generator for Lua
 ** See Copyright Notice in lua.h
 */
@@ -605,9 +605,7 @@ void luaK_int (FuncState *fs, int reg, lua_Integer i) {
 
 
 static int floatI (lua_Number f, lua_Integer *fi) {
-  TValue v;
-  setfltvalue(&v, f);
-  return (luaV_flttointeger(&v, fi, 0) && fitsBx(*fi));
+  return (luaV_flttointeger(f, fi, 0) && fitsBx(*fi));
 }
 
 

ltable.c

@@ -1,5 +1,5 @@
 /*
-** $Id: ltable.c,v 2.131 2018/01/28 15:13:26 roberto Exp roberto $
+** $Id: ltable.c,v 2.132 2018/02/19 20:06:56 roberto Exp roberto $
 ** Lua tables (hash)
 ** See Copyright Notice in lua.h
 */
@@ -559,12 +559,13 @@ TValue *luaH_newkey (lua_State *L, Table *t, const TValue *key) {
   TValue aux;
   if (ttisnil(key)) luaG_runerror(L, "table index is nil");
   else if (ttisfloat(key)) {
+    lua_Number f = fltvalue(key);
     lua_Integer k;
-    if (luaV_flttointeger(key, &k, 0)) {  /* does index fit in an integer? */
+    if (luaV_flttointeger(f, &k, 0)) {  /* does key fit in an integer? */
       setivalue(&aux, k);
       key = &aux;  /* insert it as an integer */
     }
-    else if (luai_numisnan(fltvalue(key)))
+    else if (luai_numisnan(f))
       luaG_runerror(L, "table index is NaN");
   }
   mp = mainpositionTV(t, key);
@@ -669,7 +670,7 @@ const TValue *luaH_get (Table *t, const TValue *key) {
     case LUA_TNIL: return luaO_nilobject;
     case LUA_TNUMFLT: {
       lua_Integer k;
-      if (luaV_flttointeger(key, &k, 0)) /* index is an integral? */
+      if (luaV_flttointeger(fltvalue(key), &k, 0)) /* index is an integral? */
         return luaH_getint(t, k);  /* use specialized version */
       /* else... */
     }  /* FALLTHROUGH */

lvm.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lvm.c,v 2.341 2018/02/17 19:20:00 roberto Exp roberto $
+** $Id: lvm.c,v 2.342 2018/02/19 20:06:56 roberto Exp roberto $
 ** Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -90,11 +90,7 @@ int luaV_tonumber_ (const TValue *obj, lua_Number *n) {
 ** mode == 1: takes the floor of the number
 ** mode == 2: takes the ceil of the number
 */
-int luaV_flttointeger (const TValue *obj, lua_Integer *p, int mode) {
-  if (!ttisfloat(obj))
-    return 0;
-  else {
-    lua_Number n = fltvalue(obj);
+int luaV_flttointeger (lua_Number n, lua_Integer *p, int mode) {
   lua_Number f = l_floor(n);
   if (n != f) {  /* not an integral value? */
     if (mode == 0) return 0;  /* fails if mode demands integral value */
@@ -102,24 +98,34 @@ int luaV_flttointeger (const TValue *obj, lua_Integer *p, int mode) {
       f += 1;  /* convert floor to ceil (remember: n != f) */
   }
   return lua_numbertointeger(f, p);
-  }
 }
 
 
 /*
-** try to convert a value to an integer. ("Fast track" is handled
-** by macro 'tointeger'.)
+** try to convert a value to an integer, rounding according to 'mode',
+** without string coercion.
+** ("Fast track" handled by macro 'tointegerns'.)
+*/
+int luaV_tointegerns (const TValue *obj, lua_Integer *p, int mode) {
+  if (ttisfloat(obj))
+    return luaV_flttointeger(fltvalue(obj), p, mode);
+  else if (ttisinteger(obj)) {
+    *p = ivalue(obj);
+    return 1;
+  }
+  else
+    return 0;
+}
+
+
+/*
+** try to convert a value to an integer.
 */
 int luaV_tointeger (const TValue *obj, lua_Integer *p, int mode) {
   TValue v;
   if (cvt2num(obj) && luaO_str2num(svalue(obj), &v) == vslen(obj) + 1)
     obj = &v;  /* change string to its corresponding number */
-  if (ttisinteger(obj)) {
-    *p = ivalue(obj);
-    return 1;
-  }
-  else
-    return luaV_flttointeger(obj, p, mode);
+  return luaV_tointegerns(obj, p, mode);
 }
 
 

lvm.h

@@ -1,5 +1,5 @@
 /*
-** $Id: lvm.h,v 2.48 2017/11/29 13:02:17 roberto Exp roberto $
+** $Id: lvm.h,v 2.49 2018/02/19 20:06:56 roberto Exp roberto $
 ** Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -55,8 +55,7 @@
 
 /* convert an object to an integer (without string coercion) */
 #define tointegerns(o,i) \
-    (ttisinteger(o) ? (*(i) = ivalue(o), 1) \
-                    : luaV_flttointeger(o,i,LUA_FLOORN2I))
+  (ttisinteger(o) ? (*(i) = ivalue(o), 1) : luaV_tointegerns(o,i,LUA_FLOORN2I))
 
 
 #define intop(op,v1,v2) l_castU2S(l_castS2U(v1) op l_castS2U(v2))
@@ -106,7 +105,8 @@ LUAI_FUNC int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r);
 LUAI_FUNC int luaV_lessequal (lua_State *L, const TValue *l, const TValue *r);
 LUAI_FUNC int luaV_tonumber_ (const TValue *obj, lua_Number *n);
 LUAI_FUNC int luaV_tointeger (const TValue *obj, lua_Integer *p, int mode);
-LUAI_FUNC int luaV_flttointeger (const TValue *obj, lua_Integer *p, int mode);
+LUAI_FUNC int luaV_tointegerns (const TValue *obj, lua_Integer *p, int mode);
+LUAI_FUNC int luaV_flttointeger (lua_Number n, lua_Integer *p, int mode);
 LUAI_FUNC void luaV_finishget (lua_State *L, const TValue *t, TValue *key,
                                StkId val, const TValue *slot);
 LUAI_FUNC void luaV_finishset (lua_State *L, const TValue *t, TValue *key,