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PDP-10 Archives
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SRI_NIC_PERM_FS_1_19910112
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c/include/float.h
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/* <FLOAT.H> - ANSI floating-point limit definitions
**
** (c) Copyright Ken Harrenstien 1989
**
*/
#ifndef _FLOAT_INCLUDED
#define _FLOAT_INCLUDED
#include <c-env.h>
#if !CPU_PDP10
#error <float.h> not supported for non-PDP10 machines
#else
/* Rounding mode for floating point addition */
#define FLT_ROUNDS 1 /* "to nearest" */
/* Radix of exponent representation */
#define FLT_RADIX 2
/* Base-FLT_RADIX digits in floating point significand */
#define FLT_MANT_DIG 27
#define DBL_MANT_DIG 62
#define LDBL_MANT_DIG DBL_MANT_DIG /* 59 if G format */
/* # of decimal digits of significance */
#define FLT_DIG 8
#define DBL_DIG 18
#define LDBL_DIG DBL_DIG /* 17 if G format */
/* Minimum negative integer such that FLT_RADIX raised to that power minus 1
** is a normalized floating-point number.
*/
#define FLT_MIN_EXP -128
#define DBL_MIN_EXP -128
#define LDBL_MIN_EXP DBL_MIN_EXP /* -1024 if G format */
/* Minimum negative integer such that 10 raised to that power is in the range
** of normalized floating-point numbers.
*/
#define FLT_MIN_10_EXP -38
#define DBL_MIN_10_EXP -38
#define LDBL_MIN_10_EXP DBL_MIN_10_EXP /* -309 if G format */
#define FLT_MAX_EXP 127
#define DBL_MAX_EXP 127
#define LDBL_MAX_EXP DBL_MAX_EXP /* +1023 if G format */
#define FLT_MAX_10_EXP 38
#define DBL_MAX_10_EXP 38
#define LDBL_MAX_10_EXP DBL_MAX_10_EXP /* +307 if G format */
/* Maximum representable finite floating-point number */
#define FLT_MAX _fltmax /* 1.70141183E+38F */
#define DBL_MAX _dblmax /* 1.701411834604692316E+38 */
#define LDBL_MAX _ldbmax
/* Difference between 1.0 and the least value (normalized) greater than 1.0 */
#define FLT_EPSILON _flteps /* 1.4901161E-8F */
#define DBL_EPSILON _dbleps /* 4.336808689942017736E-19 */
#define LDBL_EPSILON _ldbeps
/* Minimum normalized positive floating-point number */
#define FLT_MIN _fltmin /* 1.46936793E-39F */
#define DBL_MIN _dblmin /* 1.469367938527859384E-39 */
#define LDBL_MIN _ldbmin
extern float _fltmax, _flteps, _fltmin;
extern double _dblmax, _dbleps, _dblmin;
extern long double _ldbmax, _ldbeps, _ldbmin;
#if CENV_DFL_S /* Hacking KA-10 software format doubles?? */
#undef DBL_MANT_DIG
#undef DBL_DIG
#undef DBL_MIN_EXP
#undef DBL_MIN_10_EXP
#undef DBL_MAX_EXP
#undef DBL_MAX_10_EXP
#define DBL_MANT_DIG (27+27)
#define DBL_DIG 16
#define DBL_MIN_EXP -128 /* Not sure of this */
#define DBL_MIN_10_EXP -38 /* Not sure of this */
#define DBL_MAX_EXP 127
#define DBL_MAX_10_EXP 38
#endif
#endif /* if CPU_PDP10 */
#endif /* ifndef _FLOAT_INCLUDED */