better(?) handling of '#define's for IEEE-related tricks + avoid using

IEEE trick for 64-bit integer types (lua_Integer on 64-bit machines)

lobject.h

@@ -1,5 +1,5 @@
 /*
-** $Id: lobject.h,v 2.68 2012/01/25 21:05:40 roberto Exp roberto $
+** $Id: lobject.h,v 2.69 2012/05/08 13:53:33 roberto Exp roberto $
 ** Type definitions for Lua objects
 ** See Copyright Notice in lua.h
 */
@@ -266,6 +266,8 @@ typedef struct lua_TValue TValue;
 #define setsvalue2n	setsvalue
 
 
+/* check whether a number is valid (useful only for NaN trick) */
+#define luai_checknum(L,o,c)	{ /* empty */ }
 
 
 /*
@@ -273,10 +275,7 @@ typedef struct lua_TValue TValue;
 ** NaN Trick
 ** =======================================================
 */
-
-#if defined(LUA_NANTRICK) \
- || defined(LUA_NANTRICK_LE) \
- || defined(LUA_NANTRICK_BE)
+#if defined(LUA_NANTRICK)
 
 /*
 ** numbers are represented in the 'd_' field. All other values have the
@@ -284,15 +283,23 @@ typedef struct lua_TValue TValue;
 ** a "signaled NaN", which is never generated by regular operations by
 ** the CPU (nor by 'strtod')
 */
-#if !defined(NNMARK)
+
+/* allows for external implementation for part of the trick */
+#if !defined(NNMARK)	/* { */
+
+
+#if !defined(LUA_IEEEENDIAN)
+#error option 'LUA_NANTRICK' needs 'LUA_IEEEENDIAN'
+#endif
+
+
 #define NNMARK		0x7FF7A500
 #define NNMASK		0x7FFFFF00
-#endif
 
 #undef TValuefields
 #undef NILCONSTANT
 
-#if defined(LUA_NANTRICK_LE)
+#if (LUA_IEEEENDIAN == 0)	/* { */
 
 /* little endian */
 #define TValuefields  \
@@ -303,7 +310,7 @@ typedef struct lua_TValue TValue;
 #define d_(o)		((o)->u.d__)
 #define tt_(o)		((o)->u.i.tt__)
 
-#elif defined(LUA_NANTRICK_BE)
+#else				/* }{ */
 
 /* big endian */
 #define TValuefields  \
@@ -314,10 +321,9 @@ typedef struct lua_TValue TValue;
 #define d_(o)		((o)->u.d__)
 #define tt_(o)		((o)->u.i.tt__)
 
-#elif !defined(TValuefields)
-#error option 'LUA_NANTRICK' needs declaration for 'TValuefields'
+#endif				/* } */
 
-#endif
+#endif			/* } */
 
 
 /* correspondence with standard representation */
@@ -367,14 +373,9 @@ typedef struct lua_TValue TValue;
 	(ttisnumber(o1) ? ttisnumber(o2) : (tt_(o1) == tt_(o2)))
 
 
-
+#undef luai_checknum
 #define luai_checknum(L,o,c)	{ if (!ttisnumber(o)) c; }
 
-
-#else
-
-#define luai_checknum(L,o,c)	{ /* empty */ }
-
 #endif
 /* }====================================================== */