/* * 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 * * 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: 1.2 $ * $Author: bellard $ * $Date: 2005/04/17 13:14:29 $ * */ #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_ */