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Diffstat (limited to 'winsup/mingw/include/float.h')
| -rw-r--r-- | winsup/mingw/include/float.h | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/winsup/mingw/include/float.h b/winsup/mingw/include/float.h new file mode 100644 index 000000000..af7c08614 --- /dev/null +++ b/winsup/mingw/include/float.h @@ -0,0 +1,219 @@ +/* + * 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 + * DISCLAMED. 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 + +/* Return values for fpclass. */ +#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 */ + +/* 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 (); /* Clear the FPU status word */ +unsigned int _statusfp (); /* Report the FPU status word */ +#define _clear87 _clearfp +#define _status87 _statusfp + +void _fpreset (); /* Reset the FPU */ +void fpreset (); + +/* Global 'variable' for the current floating point error code. */ +int * __fpecode(); +#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_ */ + |