Source code of Windows XP (NT5)
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/***
*float.h - constants for floating point values** Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.**Purpose:* This file contains defines for a number of implementation dependent* values which are commonly used by sophisticated numerical (floating* point) programs.* [ANSI]** [Public]**Revision History:* 08-05-87 PHG added comments* 12-11-87 JCR Added "_loadds" functionality* 12-18-87 JCR Added _FAR_ to declarations* 02-10-88 JCR Cleaned up white space* 07-12-88 JCR Added some close comment delimeters (bug fix)* 08-22-88 GJF Modified to also work with the 386 (small model only)* 12-16-88 GJF Changed [FLT|DBL|LDBL]_ROUNDS to 1* 04-28-89 SKS Put parentheses around negative constants* 05-03-89 JCR Added _INTERNAL_IFSTRIP for relinc usage* 08-03-89 GJF Cleanup, now specific to OS/2 2.0 (i.e., 386 flat model)* 10-20-89 KRS Add 'F' to FLT_MAX/MIN/EPSILON consts like in ANSI spec.* 10-30-89 GJF Fixed copyright* 11-02-89 JCR Changed "DLL" to "_DLL"* 02-28-90 GJF Added #ifndef _INC_FLOAT and #include <cruntime.h>* stuff. Also, removed some (now) useless preprocessor* directives.* 03-22-90 GJF Replaced _cdecl with _CALLTYPE2 (for now).* 08-17-90 WAJ Floating point routines now use _stdcall.* 09-25-90 GJF Added _fpecode stuff.* 08-20-91 JCR C++ and ANSI naming* 02-03-91 GDP Added definitions for MIPS* 04-03-92 GDP Use abstract control word definitions for all platforms* Removed Infinity Control, [EM|SW]_DENORMAL, SW_SQRTNEG* 04-14-92 GDP Added Inf. control, [EM|SW]_DENORMAL, SW_SQRTNEG again* 05-07-92 GDP Added IEEE recommended functions* 08-06-92 GJF Function calling type and variable type macros. Also* revised compiler/target processor macro usage.* 09-16-92 GJF Added _CRTAPI1 to _copysign - _fpclass prototypes.* 11-09-92 GJF Fixed preprocessing conditionals for MIPS.* 01-03-93 SRW Fold in ALPHA changes* 01-09-93 SRW Remove usage of MIPS and ALPHA to conform to ANSI* Use _MIPS_ and _ALPHA_ instead.* 01-21-93 GJF Removed support for C6-386's _cdecl.* 04-06-93 SKS Replace _CRTAPI1/2 with __cdecl, _CRTVAR1 with nothing* 04-07-93 SKS Add _CRTIMP keyword for CRT DLL model* Use link-time aliases for old names, not #define's* Remove support for DOSX32, non-X86 CPUs, etc.* 09-01-93 GJF Merged Cuda and NT SDK versions.* 10-12-93 GJF Re-merged. Dropped use of _MIPS_ and _ALPHA_.* 06-06-94 SKS Change if def(_MT) to if def(_MT) || def(_DLL)* This will support single-thread apps using MSVCRT*.DLL* 10-02-94 BWT Add PPC support.* 12-15-94 XY merged with mac header* 02-11-95 CFW Add _CRTBLD to avoid users getting wrong headers.* 02-14-95 CFW Clean up Mac merge.* 04-11-95 JWM Redefined CW_DEFAULT for x86.* 05-24-95 CFW xxx87() nor for mac use.* 05-24-95 CFW oldnames xxx87() uses macros.* 12-14-95 JWM Add "#pragma once".* 02-05-97 GJF Deleted obsolete support for _CRTAPI* and _NTSDK.* Replaced (defined(_M_MPPC) || defined(_M_M68K)) with* defined(_MAC) where appropriate. Also, detab-ed.* 05-21-97 RKP Added new denormal options for ALPHA.* 09-30-97 JWM Restored not-so-obsolete _CRTAPI1 support.* 10-07-97 RDL Added IA64.* 05-13-99 PML Remove _CRTAPI1* 05-17-99 PML Remove all Macintosh support.* 06-04-99 PML Define _CW_DEFAULT for IA64.*****/
#if _MSC_VER > 1000 /*IFSTRIP=IGN*/
#pragma once
#endif
#ifndef _INC_FLOAT
#define _INC_FLOAT
#if !defined(_WIN32)
#error ERROR: Only Win32 target supported!
#endif
#ifndef _CRTBLD
/* This version of the header files is NOT for user programs.
* It is intended for use when building the C runtimes ONLY. * The version intended for public use will not have this message. */#error ERROR: Use of C runtime library internal header file.
#endif /* _CRTBLD */
#ifdef __cplusplus
extern "C" {#endif
#ifndef _INTERNAL_IFSTRIP_
#include <cruntime.h>
#endif /* _INTERNAL_IFSTRIP_ */
/* Define _CRTIMP */
#ifndef _CRTIMP
#ifdef CRTDLL
#define _CRTIMP __declspec(dllexport)
#else /* ndef CRTDLL */
#ifdef _DLL
#define _CRTIMP __declspec(dllimport)
#else /* ndef _DLL */
#define _CRTIMP
#endif /* _DLL */
#endif /* CRTDLL */
#endif /* _CRTIMP */
/* Define __cdecl for non-Microsoft compilers */
#if ( !defined(_MSC_VER) && !defined(__cdecl) )
#define __cdecl
#endif
#define DBL_DIG 15 /* # of decimal digits of precision */
#define DBL_EPSILON 2.2204460492503131e-016 /* smallest such that 1.0+DBL_EPSILON != 1.0 */
#define DBL_MANT_DIG 53 /* # of bits in mantissa */
#define DBL_MAX 1.7976931348623158e+308 /* max value */
#define DBL_MAX_10_EXP 308 /* max decimal exponent */
#define DBL_MAX_EXP 1024 /* max binary exponent */
#define DBL_MIN 2.2250738585072014e-308 /* min positive value */
#define DBL_MIN_10_EXP (-307) /* min decimal exponent */
#define DBL_MIN_EXP (-1021) /* min binary exponent */
#define _DBL_RADIX 2 /* exponent radix */
#define _DBL_ROUNDS 1 /* addition rounding: near */
#define FLT_DIG 6 /* # of decimal digits of precision */
#define FLT_EPSILON 1.192092896e-07F /* smallest such that 1.0+FLT_EPSILON != 1.0 */
#define FLT_GUARD 0
#define FLT_MANT_DIG 24 /* # of bits in mantissa */
#define FLT_MAX 3.402823466e+38F /* max value */
#define FLT_MAX_10_EXP 38 /* max decimal exponent */
#define FLT_MAX_EXP 128 /* max binary exponent */
#define FLT_MIN 1.175494351e-38F /* min positive value */
#define FLT_MIN_10_EXP (-37) /* min decimal exponent */
#define FLT_MIN_EXP (-125) /* min binary exponent */
#define FLT_NORMALIZE 0
#define FLT_RADIX 2 /* exponent radix */
#define FLT_ROUNDS 1 /* addition rounding: near */
#define LDBL_DIG DBL_DIG /* # of decimal digits of precision */
#define LDBL_EPSILON DBL_EPSILON /* smallest such that 1.0+LDBL_EPSILON != 1.0 */
#define LDBL_MANT_DIG DBL_MANT_DIG /* # of bits in mantissa */
#define LDBL_MAX DBL_MAX /* max value */
#define LDBL_MAX_10_EXP DBL_MAX_10_EXP /* max decimal exponent */
#define LDBL_MAX_EXP DBL_MAX_EXP /* max binary exponent */
#define LDBL_MIN DBL_MIN /* min positive value */
#define LDBL_MIN_10_EXP DBL_MIN_10_EXP /* min decimal exponent */
#define LDBL_MIN_EXP DBL_MIN_EXP /* min binary exponent */
#define _LDBL_RADIX DBL_RADIX /* exponent radix */
#define _LDBL_ROUNDS DBL_ROUNDS /* addition rounding: near */
/* Function prototypes */
_CRTIMP unsigned int __cdecl _clearfp(void);_CRTIMP unsigned int __cdecl _controlfp(unsigned int,unsigned int);_CRTIMP unsigned int __cdecl _statusfp(void);_CRTIMP void __cdecl _fpreset(void);
#define _clear87 _clearfp
#define _status87 _statusfp
/*
* Abstract User Control Word Mask and bit definitions */#define _MCW_EM 0x0008001f /* interrupt Exception Masks */
#define _EM_INEXACT 0x00000001 /* inexact (precision) */
#define _EM_UNDERFLOW 0x00000002 /* underflow */
#define _EM_OVERFLOW 0x00000004 /* overflow */
#define _EM_ZERODIVIDE 0x00000008 /* zero divide */
#define _EM_INVALID 0x00000010 /* invalid */
#define _MCW_RC 0x00000300 /* Rounding Control */
#define _RC_NEAR 0x00000000 /* near */
#define _RC_DOWN 0x00000100 /* down */
#define _RC_UP 0x00000200 /* up */
#define _RC_CHOP 0x00000300 /* chop */
/*
* Abstract User Status Word bit definitions */
#define _SW_INEXACT 0x00000001 /* inexact (precision) */
#define _SW_UNDERFLOW 0x00000002 /* underflow */
#define _SW_OVERFLOW 0x00000004 /* overflow */
#define _SW_ZERODIVIDE 0x00000008 /* zero divide */
#define _SW_INVALID 0x00000010 /* invalid */
/*
* i386 specific definitions */#define _MCW_PC 0x00030000 /* Precision Control */
#define _PC_64 0x00000000 /* 64 bits */
#define _PC_53 0x00010000 /* 53 bits */
#define _PC_24 0x00020000 /* 24 bits */
#define _MCW_IC 0x00040000 /* Infinity Control */
#define _IC_AFFINE 0x00040000 /* affine */
#define _IC_PROJECTIVE 0x00000000 /* projective */
#define _EM_DENORMAL 0x00080000 /* denormal exception mask (_control87 only) */
#define _SW_DENORMAL 0x00080000 /* denormal status bit */
_CRTIMP unsigned int __cdecl _control87(unsigned int,unsigned int);
/*
* RISC specific definitions */
#define _MCW_DN 0x03000000 /* Denormal Control */
#define _DN_SAVE 0x00000000 /* save denormal results and operands */
#define _DN_FLUSH 0x01000000 /* flush denormal results and operands to zero */
#define _DN_FLUSH_OPERANDS_SAVE_RESULTS 0x02000000 /* flush operands to zero and save results */
#define _DN_SAVE_OPERANDS_FLUSH_RESULTS 0x03000000 /* save operands and flush results to zero */
/* initial Control Word value */
#if defined(_M_IX86)
#define _CW_DEFAULT ( _RC_NEAR + _PC_53 + _EM_INVALID + _EM_ZERODIVIDE + _EM_OVERFLOW + _EM_UNDERFLOW + _EM_INEXACT + _EM_DENORMAL)
#elif defined(_M_IA64)
#define _CW_DEFAULT ( _RC_NEAR + _PC_64 + _EM_INVALID + _EM_ZERODIVIDE + _EM_OVERFLOW + _EM_UNDERFLOW + _EM_INEXACT + _EM_DENORMAL)
#elif defined(_M_MRX000) || defined (_M_ALPHA) || defined(_M_PPC)
#define _CW_DEFAULT ( _RC_NEAR + _DN_FLUSH + _EM_INVALID + _EM_ZERODIVIDE + _EM_OVERFLOW + _EM_UNDERFLOW + _EM_INEXACT )
#endif
/* Global variable holding floating point error code */
#if defined(_MT) || defined(_DLL)
_CRTIMP extern int * __cdecl __fpecode(void);#define _fpecode (*__fpecode())
#else /* ndef _MT && ndef _DLL */
extern int _fpecode;#endif /* _MT || _DLL */
/* invalid subconditions (_SW_INVALID also set) */
#define _SW_UNEMULATED 0x0040 /* unemulated instruction */
#define _SW_SQRTNEG 0x0080 /* square root of a neg number */
#define _SW_STACKOVERFLOW 0x0200 /* FP stack overflow */
#define _SW_STACKUNDERFLOW 0x0400 /* FP stack underflow */
/* Floating point error signals and return codes */
#define _FPE_INVALID 0x81
#define _FPE_DENORMAL 0x82
#define _FPE_ZERODIVIDE 0x83
#define _FPE_OVERFLOW 0x84
#define _FPE_UNDERFLOW 0x85
#define _FPE_INEXACT 0x86
#define _FPE_UNEMULATED 0x87
#define _FPE_SQRTNEG 0x88
#define _FPE_STACKOVERFLOW 0x8a
#define _FPE_STACKUNDERFLOW 0x8b
#define _FPE_EXPLICITGEN 0x8c /* raise( SIGFPE ); */
/* IEEE recommended functions */
_CRTIMP double __cdecl _copysign (double, double);_CRTIMP double __cdecl _chgsign (double);_CRTIMP double __cdecl _scalb(double, long);_CRTIMP double __cdecl _logb(double);_CRTIMP double __cdecl _nextafter(double, double);_CRTIMP int __cdecl _finite(double);_CRTIMP int __cdecl _isnan(double);_CRTIMP int __cdecl _fpclass(double);
#define _FPCLASS_SNAN 0x0001 /* signaling NaN */
#define _FPCLASS_QNAN 0x0002 /* quiet NaN */
#define _FPCLASS_NINF 0x0004 /* negative infinity */
#define _FPCLASS_NN 0x0008 /* negative normal */
#define _FPCLASS_ND 0x0010 /* negative denormal */
#define _FPCLASS_NZ 0x0020 /* -0 */
#define _FPCLASS_PZ 0x0040 /* +0 */
#define _FPCLASS_PD 0x0080 /* positive denormal */
#define _FPCLASS_PN 0x0100 /* positive normal */
#define _FPCLASS_PINF 0x0200 /* positive infinity */
#if !__STDC__
/* Non-ANSI names for compatibility */
#define clear87 _clear87
#define status87 _status87
#define control87 _control87
_CRTIMP void __cdecl fpreset(void);
#define DBL_RADIX _DBL_RADIX
#define DBL_ROUNDS _DBL_ROUNDS
#define LDBL_RADIX _LDBL_RADIX
#define LDBL_ROUNDS _LDBL_ROUNDS
#define MCW_EM _MCW_EM
#define EM_INVALID _EM_INVALID
#define EM_DENORMAL _EM_DENORMAL
#define EM_ZERODIVIDE _EM_ZERODIVIDE
#define EM_OVERFLOW _EM_OVERFLOW
#define EM_UNDERFLOW _EM_UNDERFLOW
#define EM_INEXACT _EM_INEXACT
#define MCW_IC _MCW_IC
#define IC_AFFINE _IC_AFFINE
#define IC_PROJECTIVE _IC_PROJECTIVE
#define MCW_RC _MCW_RC
#define RC_CHOP _RC_CHOP
#define RC_UP _RC_UP
#define RC_DOWN _RC_DOWN
#define RC_NEAR _RC_NEAR
#define MCW_PC _MCW_PC
#define PC_24 _PC_24
#define PC_53 _PC_53
#define PC_64 _PC_64
#define CW_DEFAULT _CW_DEFAULT
#define SW_INVALID _SW_INVALID
#define SW_DENORMAL _SW_DENORMAL
#define SW_ZERODIVIDE _SW_ZERODIVIDE
#define SW_OVERFLOW _SW_OVERFLOW
#define SW_UNDERFLOW _SW_UNDERFLOW
#define SW_INEXACT _SW_INEXACT
#define SW_UNEMULATED _SW_UNEMULATED
#define SW_SQRTNEG _SW_SQRTNEG
#define SW_STACKOVERFLOW _SW_STACKOVERFLOW
#define SW_STACKUNDERFLOW _SW_STACKUNDERFLOW
#define FPE_INVALID _FPE_INVALID
#define FPE_DENORMAL _FPE_DENORMAL
#define FPE_ZERODIVIDE _FPE_ZERODIVIDE
#define FPE_OVERFLOW _FPE_OVERFLOW
#define FPE_UNDERFLOW _FPE_UNDERFLOW
#define FPE_INEXACT _FPE_INEXACT
#define FPE_UNEMULATED _FPE_UNEMULATED
#define FPE_SQRTNEG _FPE_SQRTNEG
#define FPE_STACKOVERFLOW _FPE_STACKOVERFLOW
#define FPE_STACKUNDERFLOW _FPE_STACKUNDERFLOW
#define FPE_EXPLICITGEN _FPE_EXPLICITGEN
#endif /* __STDC__ */
#ifdef __cplusplus
}#endif
#endif /* _INC_FLOAT */
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