float.h

Dos6.0

/***
*float.h - constants for floating point values
*
*	Copyright (c) 1985-1990, 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]
*
****/

#if defined(_DLL) && !defined(_MT)
#error Cannot define _DLL without _MT
#endif

#ifdef _MT
#define _FAR_ _far
#else
#define _FAR_
#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 	7			/* # 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	19			/* # of decimal digits of precision */
#define LDBL_EPSILON	5.4210108624275221706e-020  /* smallest such that 1.0+LDBL_EPSILON != 1.0 */
#define LDBL_MANT_DIG	64			/* # of bits in mantissa */
#define LDBL_MAX	1.189731495357231765e+4932L /* max value */
#define LDBL_MAX_10_EXP 4932			/* max decimal exponent */
#define LDBL_MAX_EXP	16384			/* max binary exponent */
#define LDBL_MIN	3.3621031431120935063e-4932L /* min positive value */
#define LDBL_MIN_10_EXP (-4931) 		/* min decimal exponent */
#define LDBL_MIN_EXP	(-16381)		/* min binary exponent */
#define LDBL_RADIX	2			/* exponent radix */
#define LDBL_ROUNDS	1			/* addition rounding: near */


/*
 *  8087/80287 math control information
 */


/* User Control Word Mask and bit definitions.
 * These definitions match the 8087/80287
 */

#define MCW_EM		0x003f		/* interrupt Exception Masks */
#define EM_INVALID	0x0001		/*   invalid */
#define EM_DENORMAL	0x0002		/*   denormal */
#define EM_ZERODIVIDE	0x0004		/*   zero divide */
#define EM_OVERFLOW	0x0008		/*   overflow */
#define EM_UNDERFLOW	0x0010		/*   underflow */
#define EM_INEXACT	0x0020		/*   inexact (precision) */

#define MCW_IC		0x1000		/* Infinity Control */
#define IC_AFFINE	0x1000		/*   affine */
#define IC_PROJECTIVE	0x0000		/*   projective */

#define MCW_RC		0x0c00		/* Rounding Control */
#define RC_CHOP 	0x0c00		/*   chop */
#define RC_UP		0x0800		/*   up */
#define RC_DOWN 	0x0400		/*   down */
#define RC_NEAR 	0x0000		/*   near */

#define MCW_PC		0x0300		/* Precision Control */
#define PC_24		0x0000		/*    24 bits */
#define PC_53		0x0200		/*    53 bits */
#define PC_64		0x0300		/*    64 bits */


/* initial Control Word value */

#define CW_DEFAULT ( IC_AFFINE + RC_NEAR + PC_64 + EM_DENORMAL + EM_UNDERFLOW + EM_INEXACT )


/* user Status Word bit definitions */

#define SW_INVALID	0x0001	/* invalid */
#define SW_DENORMAL	0x0002	/* denormal */
#define SW_ZERODIVIDE	0x0004	/* zero divide */
#define SW_OVERFLOW	0x0008	/* overflow */
#define SW_UNDERFLOW	0x0010	/* underflow */
#define SW_INEXACT	0x0020	/* inexact (precision) */


/* 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 ); */

/* function prototypes */

unsigned int _FAR_ _cdecl _clear87(void);
unsigned int _FAR_ _cdecl _control87(unsigned int, unsigned int);
void _FAR_ _cdecl _fpreset(void);
unsigned int _FAR_ _cdecl _status87(void);