v4.0/src/TOOLS/BLD/INC/FLOAT.H

   1 /***
   2 *float.h - constants for floating point values
   3 *
   4 *   Copyright (c) 1985-1988, Microsoft Corporation.  All rights reserved.
   5 *
   6 *Purpose:
   7 *   This file contains defines for a number of implementation dependent
   8 *   values which are commonly used by sophisticated numerical (floating
   9 *   point) programs.
  10 *   [ANSI]
  11 *
  12 *******************************************************************************/
  13
  14
  15 #ifndef NO_EXT_KEYS /* extensions enabled */
  16     #define _CDECL  cdecl
  17 #else /* extensions not enabled */
  18     #define _CDECL
  19 #endif /* NO_EXT_KEYS */
  20
  21 #define DBL_DIG         15                      /* # of decimal digits of precision */
  22 #define DBL_EPSILON     2.2204460492503131e-016 /* smallest such that 1.0+DBL_EPSILON != 1.0 */
  23 #define DBL_MANT_DIG    53                      /* # of bits in mantissa */
  24 #define DBL_MAX         1.7976931348623158e+308 /* max value */
  25 #define DBL_MAX_10_EXP  308                     /* max decimal exponent */
  26 #define DBL_MAX_EXP     1024                    /* max binary exponent */
  27 #define DBL_MIN         2.2250738585072014e-308 /* min positive value */
  28 #define DBL_MIN_10_EXP  -307                    /* min decimal exponent
  29 #define DBL_MIN_EXP     -1021                   /* min binary exponent */
  30 #define DBL_RADIX       2                       /* exponent radix */
  31 #define DBL_ROUNDS      0                       /* addition rounding: chops */
  32
  33 #define FLT_DIG         6                       /* # of decimal digits of precision */
  34 #define FLT_EPSILON     1.192092896e-07         /* smallest such that 1.0+FLT_EPSILON != 1.0 */
  35 #define FLT_GUARD       0
  36 #define FLT_MANT_DIG    24                      /* # of bits in mantissa */
  37 #define FLT_MAX         3.402823466e+38         /* max value */
  38 #define FLT_MAX_10_EXP  38                      /* max decimal exponent */
  39 #define FLT_MAX_EXP     128                     /* max binary exponent */
  40 #define FLT_MIN         1.175494351e-38         /* min positive value */
  41 #define FLT_MIN_10_EXP  -37                     /* min decimal exponent */
  42 #define FLT_MIN_EXP     -125                    /* min binary exponent */
  43 #define FLT_NORMALIZE   0
  44 #define FLT_RADIX       2                       /* exponent radix */
  45 #define FLT_ROUNDS      0                       /* addition rounding: chops */
  46
  47 #define LDBL_DIG        DBL_DIG                 /* # of decimal digits of precision */
  48 #define LDBL_EPSILON    DBL_EPSILON             /* smallest such that 1.0+LDBL_EPSILON != 1.0 */
  49 #define LDBL_MANT_DIG   DBL_MANT_DIG            /* # of bits in mantissa */
  50 #define LDBL_MAX        DBL_MAX                 /* max value */
  51 #define LDBL_MAX_10_EXP DBL_MAX_10_EXP          /* max decimal exponent */
  52 #define LDBL_MAX_EXP    DBL_MAX_EXP             /* max binary exponent */
  53 #define LDBL_MIN        DBL_MIN                 /* min positive value */
  54 #define LDBL_MIN_10_EXP DBL_MIN_10_EXP          /* min deimal exponent
  55 #define LDBL_MIN_EXP    DBL_MIN_EXP             /* min binary exponent */
  56 #define LDBL_RADIX      DBL_RADIX               /* exponent radix */
  57 #define LDBL_ROUNDS     DBL_ROUNDS              /* addition rounding: chops */
  58
  59
  60 /*
  61  *  8087/80287 math control information
  62  */
  63
  64
  65 /* User Control Word Mask and bit definitions.
  66  * These definitions match the 8087/80287
  67  */
  68
  69 #define     MCW_EM          0x003f      /* interrupt Exception Masks */
  70 #define     EM_INVALID      0x0001      /*   invalid */
  71 #define     EM_DENORMAL     0x0002      /*   denormal */
  72 #define     EM_ZERODIVIDE   0x0004      /*   zero divide */
  73 #define     EM_OVERFLOW     0x0008      /*   overflow */
  74 #define     EM_UNDERFLOW    0x0010      /*   underflow */
  75 #define     EM_INEXACT      0x0020      /*   inexact (precision) */
  76
  77 #define     MCW_IC          0x1000      /* Infinity Control */
  78 #define     IC_AFFINE       0x1000      /*   affine */
  79 #define     IC_PROJECTIVE   0x0000      /*   projective */
  80
  81 #define     MCW_RC          0x0c00      /* Rounding Control */
  82 #define     RC_CHOP         0x0c00      /*   chop */
  83 #define     RC_UP           0x0800      /*   up */
  84 #define     RC_DOWN         0x0400      /*   down */
  85 #define     RC_NEAR         0x0000      /*   near */
  86
  87 #define     MCW_PC          0x0300      /* Precision Control */
  88 #define     PC_24           0x0000      /*    24 bits */
  89 #define     PC_53           0x0200      /*    53 bits */
  90 #define     PC_64           0x0300      /*    64 bits */
  91
  92
  93 /* initial Control Word value */
  94
  95 #define CW_DEFAULT ( IC_AFFINE + RC_NEAR + PC_64 + EM_DENORMAL + EM_UNDERFLOW + EM_INEXACT )
  96
  97
  98 /* user Status Word bit definitions */
  99
 100 #define SW_INVALID          0x0001      /*   invalid */
 101 #define SW_DENORMAL         0x0002      /*   denormal */
 102 #define SW_ZERODIVIDE       0x0004      /*   zero divide */
 103 #define SW_OVERFLOW         0x0008      /*   overflow */
 104 #define SW_UNDERFLOW        0x0010      /*   underflow */
 105 #define SW_INEXACT          0x0020      /*   inexact (precision) */
 106
 107
 108 /* invalid subconditions (SW_INVALID also set) */
 109
 110 #define SW_UNEMULATED       0x0040      /* unemulated instruction */
 111 #define SW_SQRTNEG          0x0080      /* square root of a neg number */
 112 #define SW_STACKOVERFLOW    0x0200      /* FP stack overflow */
 113 #define SW_STACKUNDERFLOW   0x0400      /* FP stack underflow */
 114
 115
 116 /*  Floating point error signals and return codes */
 117
 118 #define FPE_INVALID         0x81
 119 #define FPE_DENORMAL        0x82
 120 #define FPE_ZERODIVIDE      0x83
 121 #define FPE_OVERFLOW        0x84
 122 #define FPE_UNDERFLOW       0x85
 123 #define FPE_INEXACT         0x86
 124
 125 #define FPE_UNEMULATED      0x87
 126 #define FPE_SQRTNEG         0x88
 127 #define FPE_STACKOVERFLOW   0x8a
 128 #define FPE_STACKUNDERFLOW  0x8b
 129
 130 #define FPE_EXPLICITGEN     0x8c    /* raise( SIGFPE ); */
 131
 132 /* function prototypes */
 133
 134 unsigned int _CDECL _clear87(void);
 135 unsigned int _CDECL _control87(unsigned int,unsigned int);
 136 void _CDECL _fpreset(void);
 137 unsigned int _CDECL _status87(void);