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/*
* float.h
*
* Constants related to floating point arithmetic.
*
* Also included here are some non-ANSI bits for accessing the floating
* point controller.
*
* NOTE: GCC provides float.h, and it is probably more accurate than this,
* but it doesn't include the non-standard stuff for accessing the
* fp controller. (TODO: Move those bits elsewhere?) Thus it is
* probably not a good idea to use the GCC supplied version instead
* of this header.
*
* This file is part of the Mingw32 package.
*
* Contributors:
* Created by Colin Peters <colin@bird.fu.is.saga-u.ac.jp>
*
* THIS SOFTWARE IS NOT COPYRIGHTED
*
* This source code is offered for use in the public domain. You may
* use, modify or distribute it freely.
*
* This code is distributed in the hope that it will be useful but
* WITHOUT ANY WARRANTY. ALL WARRANTIES, EXPRESS OR IMPLIED ARE HEREBY
* DISCLAIMED. This includes but is not limited to warranties of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* $Revision$
* $Author$
* $Date$
*
*/
#ifndef _FLOAT_H_
#define _FLOAT_H_
/* All the headers include this file. */
#include <_mingw.h>
#define FLT_ROUNDS 1
#define FLT_GUARD 1
#define FLT_NORMALIZE 1
/*
* The characteristics of float.
*/
/* The radix for floating point representation. */
#define FLT_RADIX 2
/* Decimal digits of precision. */
#define FLT_DIG 6
/* Smallest number such that 1+x != 1 */
#define FLT_EPSILON 1.19209290e-07F
/* The number of base FLT_RADIX digits in the mantissa. */
#define FLT_MANT_DIG 24
/* The maximum floating point number. */
#define FLT_MAX 3.40282347e+38F
/* Maximum n such that FLT_RADIX^n - 1 is representable. */
#define FLT_MAX_EXP 128
/* Maximum n such that 10^n is representable. */
#define FLT_MAX_10_EXP 38
/* Minimum normalized floating-point number. */
#define FLT_MIN 1.17549435e-38F
/* Minimum n such that FLT_RADIX^n is a normalized number. */
#define FLT_MIN_EXP (-125)
/* Minimum n such that 10^n is a normalized number. */
#define FLT_MIN_10_EXP (-37)
/*
* The characteristics of double.
*/
#define DBL_DIG 15
#define DBL_EPSILON 1.1102230246251568e-16
#define DBL_MANT_DIG 53
#define DBL_MAX 1.7976931348623157e+308
#define DBL_MAX_EXP 1024
#define DBL_MAX_10_EXP 308
#define DBL_MIN 2.2250738585072014e-308
#define DBL_MIN_EXP (-1021)
#define DBL_MIN_10_EXP (-307)
/*
* The characteristics of long double.
* NOTE: long double is the same as double.
*/
#define LDBL_DIG 15
#define LDBL_EPSILON 1.1102230246251568e-16L
#define LDBL_MANT_DIG 53
#define LDBL_MAX 1.7976931348623157e+308L
#define LDBL_MAX_EXP 1024
#define LDBL_MAX_10_EXP 308
#define LDBL_MIN 2.2250738585072014e-308L
#define LDBL_MIN_EXP (-1021)
#define LDBL_MIN_10_EXP (-307)
/*
* Functions and definitions for controlling the FPU.
*/
#ifndef __STRICT_ANSI__
/* TODO: These constants are only valid for x86 machines */
/* Control word masks for unMask */
#define _MCW_EM 0x0008001F /* Error masks */
#define _MCW_IC 0x00040000 /* Infinity */
#define _MCW_RC 0x00000300 /* Rounding */
#define _MCW_PC 0x00030000 /* Precision */
/* Control word values for unNew (use with related unMask above) */
#define _EM_INVALID 0x00000010
#define _EM_DENORMAL 0x00080000
#define _EM_ZERODIVIDE 0x00000008
#define _EM_OVERFLOW 0x00000004
#define _EM_UNDERFLOW 0x00000002
#define _EM_INEXACT 0x00000001
#define _IC_AFFINE 0x00040000
#define _IC_PROJECTIVE 0x00000000
#define _RC_CHOP 0x00000300
#define _RC_UP 0x00000200
#define _RC_DOWN 0x00000100
#define _RC_NEAR 0x00000000
#define _PC_24 0x00020000
#define _PC_53 0x00010000
#define _PC_64 0x00000000
/* These are also defined in Mingw math.h, needed to work around
GCC build issues. */
/* Return values for fpclass. */
#ifndef __MINGW_FPCLASS_DEFINED
#define __MINGW_FPCLASS_DEFINED 1
#define _FPCLASS_SNAN 0x0001 /* Signaling "Not a Number" */
#define _FPCLASS_QNAN 0x0002 /* Quiet "Not a Number" */
#define _FPCLASS_NINF 0x0004 /* Negative Infinity */
#define _FPCLASS_NN 0x0008 /* Negative Normal */
#define _FPCLASS_ND 0x0010 /* Negative Denormal */
#define _FPCLASS_NZ 0x0020 /* Negative Zero */
#define _FPCLASS_PZ 0x0040 /* Positive Zero */
#define _FPCLASS_PD 0x0080 /* Positive Denormal */
#define _FPCLASS_PN 0x0100 /* Positive Normal */
#define _FPCLASS_PINF 0x0200 /* Positive Infinity */
#endif /* __MINGW_FPCLASS_DEFINED */
/* 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 ); */
#ifndef RC_INVOKED
#ifdef __cplusplus
extern "C" {
#endif
/* Set the FPU control word as cw = (cw & ~unMask) | (unNew & unMask),
* i.e. change the bits in unMask to have the values they have in unNew,
* leaving other bits unchanged. */
unsigned int _controlfp (unsigned int unNew, unsigned int unMask);
unsigned int _control87 (unsigned int unNew, unsigned int unMask);
unsigned int _clearfp (void); /* Clear the FPU status word */
unsigned int _statusfp (void); /* Report the FPU status word */
#define _clear87 _clearfp
#define _status87 _statusfp
void _fpreset (void); /* Reset the FPU */
void fpreset (void);
/* Global 'variable' for the current floating point error code. */
int * __fpecode(void);
#define _fpecode (*(__fpecode()))
/*
* IEEE recommended functions
*/
double _chgsign (double);
double _copysign (double, double);
double _logb (double);
double _nextafter (double, double);
double _scalb (double, long);
int _finite (double);
int _fpclass (double);
int _isnan (double);
#ifdef __cplusplus
}
#endif
#endif /* Not RC_INVOKED */
#endif /* Not __STRICT_ANSI__ */
#endif /* _FLOAT_H_ */
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