code for conversion macros moved from luaconf to llimits + 'uint'
renamed to 'unsigned' in those macros
This commit is contained in:
Roberto Ierusalimschy
107
luaconf.h
107
luaconf.h
@@ -1,5 +1,5 @@
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/*
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** $Id: luaconf.h,v 1.147 2010/10/29 11:13:21 roberto Exp roberto $
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** $Id: luaconf.h,v 1.148 2010/10/29 17:52:46 roberto Exp roberto $
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** Configuration file for Lua
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** See Copyright Notice in lua.h
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*/
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@@ -348,27 +348,13 @@
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/*
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** {==================================================================
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** CHANGE (to smaller values) the following definitions if your system
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** has a small C stack. (Or you may want to change them to larger
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** values if your system has a large C stack and these limits are
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** too rigid for you.) Some of these constants control the size of
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** stack-allocated arrays used by the compiler or the interpreter, while
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** others limit the maximum number of recursive calls that the compiler
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** or the interpreter can perform. Values too large may cause a C stack
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** overflow for some forms of deep constructs.
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** ===================================================================
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*/
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/*
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@@ LUAL_BUFFERSIZE is the buffer size used by the lauxlib buffer system.
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** CHANGE it if it uses too much C-stack space.
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*/
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#define LUAL_BUFFERSIZE BUFSIZ
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/* }================================================================== */
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@@ -445,32 +431,21 @@
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#define LUA_UNSIGNED unsigned LUA_INT32
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/*
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@@ lua_number2int is a macro to convert lua_Number to int.
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@@ lua_number2integer is a macro to convert lua_Number to LUA_INTEGER.
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@@ lua_number2uint is a macro to convert a lua_Number to a LUA_UNSIGNED.
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@@ lua_uint2number is a macro to convert a LUA_UNSIGNED to a lua_Number.
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*/
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#if defined(LUA_CORE) /* { */
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#if defined(LUA_NUMBER_DOUBLE) && !defined(LUA_ANSI) && \
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!defined(LUA_NOIEEE754TRICK) /* { */
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#if defined(LUA_NUMBER_DOUBLE) && !defined(LUA_ANSI) /* { */
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/* On a Microsoft compiler on a Pentium, use assembler to avoid clashes
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with a DirectX idiosyncrasy */
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#if defined(_MSC_VER) && defined(M_IX86) /* { */
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#define lua_number2int(i,n) __asm {__asm fld n __asm fistp i}
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#define lua_number2integer(i,n) lua_number2int(i, n)
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#define lua_number2uint(i,n) \
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{__int64 l; __asm {__asm fld n __asm fistp l} i = (unsigned int)l;}
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#define MS_ASMTRICK
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#else /* }{ */
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/* the next trick should work on any machine using IEEE754 with
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a 32-bit integer type */
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/* the next definition uses a trick that should work on any machine
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using IEEE754 with a 32-bit integer type */
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union luai_Cast { double l_d; LUA_INT32 l_p[2]; };
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#define LUA_IEEE754TRICK
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/*
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@@ LUA_IEEEENDIAN is the endianness of doubles in your machine
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@@ -485,77 +460,11 @@ union luai_Cast { double l_d; LUA_INT32 l_p[2]; };
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#define LUA_IEEEENDIAN 1
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#endif
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#if !defined(LUA_IEEEENDIAN) /* { */
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#define LUAI_EXTRAIEEE \
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static const union luai_Cast ieeeendian = {-(33.0 + 6755399441055744.0)};
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#define LUA_IEEEENDIAN (ieeeendian.l_p[1] == 33)
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#else
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#define LUAI_EXTRAIEEE /* empty */
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#endif /* } */
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#define lua_number2int32(i,n,t) \
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{ LUAI_EXTRAIEEE \
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volatile union luai_Cast u; u.l_d = (n) + 6755399441055744.0; \
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(i) = (t)u.l_p[LUA_IEEEENDIAN]; }
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#define lua_number2int(i,n) lua_number2int32(i, n, int)
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#define lua_number2integer(i,n) lua_number2int32(i, n, LUA_INTEGER)
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#define lua_number2uint(i,n) lua_number2int32(i, n, LUA_UNSIGNED)
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#endif /* } */
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#endif /* } */
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/* the following definitions always work, but may be slow */
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#if !defined(lua_number2int)
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#define lua_number2int(i,n) ((i)=(int)(n))
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#endif
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#if !defined(lua_number2integer)
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#define lua_number2integer(i,n) ((i)=(LUA_INTEGER)(n))
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#endif
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#if !defined(lua_number2uint) && (defined(lapi_c) || defined(luaall_c)) /* { */
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/* the following definition assures proper modulo behavior */
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#if defined(LUA_NUMBER_DOUBLE)
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#include <math.h>
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#define lua_number2uint(i,n) \
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((i)=(LUA_UNSIGNED)((n) - floor((n)/4294967296.0)*4294967296.0))
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#else
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#define lua_number2uint(i,n) ((i)=(LUA_UNSIGNED)(n))
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#endif
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#endif /* } */
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#if !defined(lua_uint2number)
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/* on several machines, coercion from unsigned to double is slow,
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so it may be worth to avoid */
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#define lua_uint2number(u) \
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((LUA_INT32)(u) < 0 ? (lua_Number)(u) : (lua_Number)(LUA_INT32)(u))
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#endif
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#endif /* } */
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/*
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@@ luai_hashnum is a macro do hash a lua_Number value into an integer.
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@* The hash must be deterministic and give reasonable values for
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@* both small and large values (outside the range of integers).
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@* It is used only in ltable.c.
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*/
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#if defined(ltable_c) || defined(luaall_c)
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#include <float.h>
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#include <math.h>
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#define luai_hashnum(i,n) { int e; \
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n = frexp(n, &e) * (lua_Number)(INT_MAX - DBL_MAX_EXP); \
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lua_number2int(i, n); i += e; }
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#endif /* ltable_c */
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#endif /* } */
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/* }================================================================== */
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