libdecnumber/decNumberLocal.h

   1 /* decNumber package local type, tuning, and macro definitions.
   2    Copyright (C) 2005 Free Software Foundation, Inc.
   3    Contributed by IBM Corporation.  Author Mike Cowlishaw.
   4
   5    This file is part of GCC.
   6
   7    GCC is free software; you can redistribute it and/or modify it under
   8    the terms of the GNU General Public License as published by the Free
   9    Software Foundation; either version 2, or (at your option) any later
  10    version.
  11
  12    In addition to the permissions in the GNU General Public License,
  13    the Free Software Foundation gives you unlimited permission to link
  14    the compiled version of this file into combinations with other
  15    programs, and to distribute those combinations without any
  16    restriction coming from the use of this file.  (The General Public
  17    License restrictions do apply in other respects; for example, they
  18    cover modification of the file, and distribution when not linked
  19    into a combine executable.)
  20
  21    GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  22    WARRANTY; without even the implied warranty of MERCHANTABILITY or
  23    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  24    for more details.
  25
  26    You should have received a copy of the GNU General Public License
  27    along with GCC; see the file COPYING.  If not, write to the Free
  28    Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  29    02110-1301, USA.  */
  30
  31 /* ------------------------------------------------------------------ */
  32 /* This header file is included by all modules in the decNumber       */
  33 /* library, and contains local type definitions, tuning parameters,   */
  34 /* etc.  It must only be included once, and should not need to be     */
  35 /* used by application programs.  decNumber.h must be included first. */
  36 /* ------------------------------------------------------------------ */
  37
  38 #if !defined(DECNUMBERLOC)
  39 #define DECNUMBERLOC
  40 #define DECNLAUTHOR   "Mike Cowlishaw"  /* Who to blame */
  41
  42   /* Local names for common types -- decNumber modules do not use int or
  43      long directly */
  44 #define Flag   uint8_t
  45 #define Byte   int8_t
  46 #define uByte  uint8_t
  47 #define Short  int16_t
  48 #define uShort uint16_t
  49 #define Int    int32_t
  50 #define uInt   uint32_t
  51 #define Unit   decNumberUnit
  52
  53
  54   /* Tuning parameter */
  55 #define DECBUFFER 36            /* Maximum size basis for local buffers. */
  56                               /* Should be a common maximum precision */
  57                               /* rounded up to a multiple of 4; must */
  58                               /* be non-negative. */
  59
  60   /* Conditional code flags -- set these to 0 for best performance */
  61 #define DECCHECK  0             /* 1 to enable robust checking */
  62 #define DECALLOC  0             /* 1 to enable memory allocation accounting */
  63 #define DECTRACE  0             /* 1 to trace critical intermediates, etc. */
  64
  65
  66   /* Development use defines */
  67 #if DECALLOC
  68      /* if these interfere with your C includes, just comment them out */
  69 #define  int ?                  /* enable to ensure we do not use plain C */
  70 #define  long ??                /* .. 'int' or 'long' types from here on */
  71 #endif
  72
  73   /* Limits and constants */
  74 #define DECNUMMAXP 999999999    /* maximum precision we can handle (9 digits) */
  75 #define DECNUMMAXE 999999999    /* maximum adjusted exponent ditto (9 digits) */
  76 #define DECNUMMINE -999999999   /* minimum adjusted exponent ditto (9 digits) */
  77 #if (DECNUMMAXP != DEC_MAX_DIGITS)
  78 #error Maximum digits mismatch
  79 #endif
  80 #if (DECNUMMAXE != DEC_MAX_EMAX)
  81 #error Maximum exponent mismatch
  82 #endif
  83 #if (DECNUMMINE != DEC_MIN_EMIN)
  84 #error Minimum exponent mismatch
  85 #endif
  86
  87   /* Set DECDPUNMAX -- the maximum integer that fits in DECDPUN digits */
  88 #if   DECDPUN==1
  89 #define DECDPUNMAX 9
  90 #elif DECDPUN==2
  91 #define DECDPUNMAX 99
  92 #elif DECDPUN==3
  93 #define DECDPUNMAX 999
  94 #elif DECDPUN==4
  95 #define DECDPUNMAX 9999
  96 #elif DECDPUN==5
  97 #define DECDPUNMAX 99999
  98 #elif DECDPUN==6
  99 #define DECDPUNMAX 999999
 100 #elif DECDPUN==7
 101 #define DECDPUNMAX 9999999
 102 #elif DECDPUN==8
 103 #define DECDPUNMAX 99999999
 104 #elif DECDPUN==9
 105 #define DECDPUNMAX 999999999
 106 #elif defined(DECDPUN)
 107 #error DECDPUN must be in the range 1-9
 108 #endif
 109
 110
 111   /* ----- Shared data ----- */
 112   /* The powers of of ten array (powers[n]==10**n, 0<=n<=10) */
 113 extern const uInt powers[];
 114
 115   /* ----- Macros ----- */
 116   /* ISZERO -- return true if decNumber dn is a zero */
 117   /* [performance-critical in some situations] */
 118 #define ISZERO(dn) decNumberIsZero(dn)  /* now just a local name */
 119
 120   /* X10 and X100 -- multiply integer i by 10 or 100 */
 121   /* [shifts are usually faster than multiply; could be conditional] */
 122 #define X10(i)  (((i)<<1)+((i)<<3))
 123 #define X100(i) (((i)<<2)+((i)<<5)+((i)<<6))
 124
 125   /* D2U -- return the number of Units needed to hold d digits */
 126 #if DECDPUN==8
 127 #define D2U(d) ((unsigned)((d)+7)>>3)
 128 #elif DECDPUN==4
 129 #define D2U(d) ((unsigned)((d)+3)>>2)
 130 #else
 131 #define D2U(d) (((d)+DECDPUN-1)/DECDPUN)
 132 #endif
 133
 134 #else
 135 #error decNumberLocal included more than once
 136 #endif