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more macros to try to make NaN trick work with other sizes of 

IEEE float numbers. (It has not been tested with such different
sizes...)
This commit is contained in:
Roberto Ierusalimschy 2011-10-17 12:46:13 -02:00
parent 217e67cb22
commit 1350a2bcb5
1 changed files with 39 additions and 17 deletions
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56
lobject.h
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@ -1,5 +1,5 @@
/*
** $Id: lobject.h,v 2.61 2011/07/04 20:29:02 roberto Exp roberto $
** $Id: lobject.h,v 2.62 2011/09/24 21:12:01 roberto Exp roberto $
** Type definitions for Lua objects
** See Copyright Notice in lua.h
*/
@ -264,51 +264,73 @@ typedef struct lua_TValue TValue;
** =======================================================
*/
#if defined(LUA_NANTRICKLE) || defined(LUA_NANTRICKBE)
#if defined(LUA_NANTRICK) \
|| defined(LUA_NANTRICK_LE) \
|| defined(LUA_NANTRICK_BE)
/*
** numbers are represented in the 'd_' field. All other values have the
** value (NNMARK | tag) in 'tt_'. A number with such pattern would be
** value (NNMARK | tag) in 'tt__'. A number with such pattern would be
** a "signaled NaN", which is never generated by regular operations by
** the CPU (nor by 'strtod')
*/
#if !defined(NNMARK)
#define NNMARK 0x7FF7A500
#define NNMASK 0x7FFFFF00
#endif
#undef TValuefields
#undef NILCONSTANT
#if defined(LUA_NANTRICKLE)
#if defined(LUA_NANTRICK_LE)
/* little endian */
#define TValuefields \
union { struct { Value v_; int tt_; } i; double d_; } u
union { struct { Value v__; int tt__; } i; double d__; } u
#define NILCONSTANT {{{NULL}, tag2tt(LUA_TNIL)}}
#else
/* field-access macros */
#define v_(o) ((o)->u.i.v__)
#define d_(o) ((o)->u.d__)
#define tt_(o) ((o)->u.i.tt__)
#elif defined(LUA_NANTRICK_BE)
/* big endian */
#define TValuefields \
union { struct { int tt_; Value v_; } i; double d_; } u
union { struct { int tt__; Value v__; } i; double d__; } u
#define NILCONSTANT {{tag2tt(LUA_TNIL), {NULL}}}
/* field-access macros */
#define v_(o) ((o)->u.i.v__)
#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
/* correspondence with standard representation */
#undef val_
#define val_(o) v_(o)
#undef num_
#define num_(o) d_(o)
#undef numfield
#define numfield /* no such field; numbers are the entire struct */
/* basic check to distinguish numbers from non-numbers */
#undef ttisnumber
#define ttisnumber(o) (((o)->u.i.tt_ & 0x7fffff00) != NNMARK)
#define ttisnumber(o) ((tt_(o) & NNMASK) != NNMARK)
#define tag2tt(t) (NNMARK | (t))
#undef val_
#define val_(o) ((o)->u.i.v_)
#undef num_
#define num_(o) ((o)->u.d_)
#undef rttype
#define rttype(o) (ttisnumber(o) ? LUA_TNUMBER : (o)->u.i.tt_ & 0xff)
#define rttype(o) (ttisnumber(o) ? LUA_TNUMBER : tt_(o) & 0xff)
#undef settt_
#define settt_(o,t) ((o)->u.i.tt_=tag2tt(t))
#define settt_(o,t) (tt_(o) = tag2tt(t))
#undef setnvalue
#define setnvalue(obj,x) \
@ -326,11 +348,11 @@ typedef struct lua_TValue TValue;
*/
#undef checktag
#define checktag(o,t) ((o)->u.i.tt_ == tag2tt(t))
#define checktag(o,t) (tt_(o) == tag2tt(t))
#undef ttisequal
#define ttisequal(o1,o2) \
(ttisnumber(o1) ? ttisnumber(o2) : ((o1)->u.i.tt_ == (o2)->u.i.tt_))
(ttisnumber(o1) ? ttisnumber(o2) : (tt_(o1) == tt_(o2)))