stdlib/gmp-impl.h

   1 /* Include file for internal GNU MP types and definitions.
   2
   3 Copyright (C) 1991, 1993, 1994, 1995, 1996 Free Software Foundation, Inc.
   4
   5 This file is part of the GNU MP Library.
   6
   7 The GNU MP Library is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU Library General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or (at your
  10 option) any later version.
  11
  12 The GNU MP Library is distributed in the hope that it will be useful, but
  13 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14 or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
  15 License for more details.
  16
  17 You should have received a copy of the GNU Library General Public License
  18 along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
  19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  20 MA 02111-1307, USA. */
  21
  22 /* When using gcc, make sure to use its builtin alloca.  */
  23 #if ! defined (alloca) && defined (__GNUC__)
  24 #define alloca __builtin_alloca
  25 #define HAVE_ALLOCA
  26 #endif
  27
  28 /* When using cc, do whatever necessary to allow use of alloca.  For many
  29    machines, this means including alloca.h.  IBM's compilers need a #pragma
  30    in "each module that needs to use alloca".  */
  31 #if ! defined (alloca)
  32 /* We need lots of variants for MIPS, to cover all versions and perversions
  33    of OSes for MIPS.  */
  34 #if defined (__mips) || defined (MIPSEL) || defined (MIPSEB) \
  35  || defined (_MIPSEL) || defined (_MIPSEB) || defined (__sgi) \
  36  || defined (__alpha) || defined (__sparc) || defined (sparc) \
  37  || defined (__ksr__)
  38 #include <alloca.h>
  39 #define HAVE_ALLOCA
  40 #endif
  41 #if defined (_IBMR2)
  42 #pragma alloca
  43 #define HAVE_ALLOCA
  44 #endif
  45 #if defined (__DECC)
  46 #define alloca(x) __ALLOCA(x)
  47 #define HAVE_ALLOCA
  48 #endif
  49 #endif
  50
  51 #if ! defined (HAVE_ALLOCA) || USE_STACK_ALLOC
  52 #include "stack-alloc.h"
  53 #else
  54 #define TMP_DECL(m)
  55 #define TMP_ALLOC(x) alloca(x)
  56 #define TMP_MARK(m)
  57 #define TMP_FREE(m)
  58 #endif
  59
  60 #ifndef NULL
  61 #define NULL ((void *) 0)
  62 #endif
  63
  64 #if ! defined (__GNUC__)
  65 #define inline                  /* Empty */
  66 #endif
  67
  68 #define ABS(x) (x >= 0 ? x : -x)
  69 #ifndef MIN
  70 #define MIN(l,o) ((l) < (o) ? (l) : (o))
  71 #endif
  72 #ifndef MAX
  73 #define MAX(h,i) ((h) > (i) ? (h) : (i))
  74 #endif
  75
  76 /* Field access macros.  */
  77 #define SIZ(x) ((x)->_mp_size)
  78 #define ABSIZ(x) ABS (SIZ (x))
  79 #define PTR(x) ((x)->_mp_d)
  80 #define EXP(x) ((x)->_mp_exp)
  81 #define PREC(x) ((x)->_mp_prec)
  82 #define ALLOC(x) ((x)->_mp_alloc)
  83
  84 #include "gmp-mparam.h"
  85 /* #include "longlong.h" */
  86
  87 #if defined (__STDC__)  || defined (__cplusplus)
  88 void *malloc (size_t);
  89 void *realloc (void *, size_t);
  90 void free (void *);
  91
  92 extern void *   (*_mp_allocate_func) (size_t);
  93 extern void *   (*_mp_reallocate_func) (void *, size_t, size_t);
  94 extern void     (*_mp_free_func) (void *, size_t);
  95
  96 void *_mp_default_allocate (size_t);
  97 void *_mp_default_reallocate (void *, size_t, size_t);
  98 void _mp_default_free (void *, size_t);
  99
 100 #else
 101
 102 #define const                   /* Empty */
 103 #define signed                  /* Empty */
 104
 105 void *malloc ();
 106 void *realloc ();
 107 void free ();
 108
 109 extern void *   (*_mp_allocate_func) ();
 110 extern void *   (*_mp_reallocate_func) ();
 111 extern void     (*_mp_free_func) ();
 112
 113 void *_mp_default_allocate ();
 114 void *_mp_default_reallocate ();
 115 void _mp_default_free ();
 116 #endif
 117
 118 /* Copy NLIMBS *limbs* from SRC to DST.  */
 119 #define MPN_COPY_INCR(DST, SRC, NLIMBS) \
 120   do {                                                                  \
 121     mp_size_t __i;                                                      \
 122     for (__i = 0; __i < (NLIMBS); __i++)                                \
 123       (DST)[__i] = (SRC)[__i];                                          \
 124   } while (0)
 125 #define MPN_COPY_DECR(DST, SRC, NLIMBS) \
 126   do {                                                                  \
 127     mp_size_t __i;                                                      \
 128     for (__i = (NLIMBS) - 1; __i >= 0; __i--)                           \
 129       (DST)[__i] = (SRC)[__i];                                          \
 130   } while (0)
 131 #define MPN_COPY MPN_COPY_INCR
 132
 133 /* Zero NLIMBS *limbs* AT DST.  */
 134 #define MPN_ZERO(DST, NLIMBS) \
 135   do {                                                                  \
 136     mp_size_t __i;                                                      \
 137     for (__i = 0; __i < (NLIMBS); __i++)                                \
 138       (DST)[__i] = 0;                                                   \
 139   } while (0)
 140
 141 #define MPN_NORMALIZE(DST, NLIMBS) \
 142   do {                                                                  \
 143     while (NLIMBS > 0)                                                  \
 144       {                                                                 \
 145         if ((DST)[(NLIMBS) - 1] != 0)                                   \
 146           break;                                                        \
 147         NLIMBS--;                                                       \
 148       }                                                                 \
 149   } while (0)
 150 #define MPN_NORMALIZE_NOT_ZERO(DST, NLIMBS) \
 151   do {                                                                  \
 152     while (1)                                                           \
 153       {                                                                 \
 154         if ((DST)[(NLIMBS) - 1] != 0)                                   \
 155           break;                                                        \
 156         NLIMBS--;                                                       \
 157       }                                                                 \
 158   } while (0)
 159
 160 /* Initialize the MP_INT X with space for NLIMBS limbs.
 161    X should be a temporary variable, and it will be automatically
 162    cleared out when the running function returns.
 163    We use __x here to make it possible to accept both mpz_ptr and mpz_t
 164    arguments.  */
 165 #define MPZ_TMP_INIT(X, NLIMBS) \
 166   do {                                                                  \
 167     mpz_ptr __x = (X);                                                  \
 168     __x->_mp_alloc = (NLIMBS);                                          \
 169     __x->_mp_d = (mp_ptr) TMP_ALLOC ((NLIMBS) * BYTES_PER_MP_LIMB);     \
 170   } while (0)
 171
 172 #define MPN_MUL_N_RECURSE(prodp, up, vp, size, tspace) \
 173   do {                                                                  \
 174     if ((size) < KARATSUBA_THRESHOLD)                                   \
 175       impn_mul_n_basecase (prodp, up, vp, size);                        \
 176     else                                                                \
 177       impn_mul_n (prodp, up, vp, size, tspace);                 \
 178   } while (0);
 179 #define MPN_SQR_N_RECURSE(prodp, up, size, tspace) \
 180   do {                                                                  \
 181     if ((size) < KARATSUBA_THRESHOLD)                                   \
 182       impn_sqr_n_basecase (prodp, up, size);                            \
 183     else                                                                \
 184       impn_sqr_n (prodp, up, size, tspace);                             \
 185   } while (0);
 186
 187 /* Structure for conversion between internal binary format and
 188    strings in base 2..36.  */
 189 struct bases
 190 {
 191   /* Number of digits in the conversion base that always fits in an mp_limb_t.
 192      For example, for base 10 on a machine where a mp_limb_t has 32 bits this
 193      is 9, since 10**9 is the largest number that fits into a mp_limb_t.  */
 194   int chars_per_limb;
 195
 196   /* log(2)/log(conversion_base) */
 197   float chars_per_bit_exactly;
 198
 199   /* base**chars_per_limb, i.e. the biggest number that fits a word, built by
 200      factors of base.  Exception: For 2, 4, 8, etc, big_base is log2(base),
 201      i.e. the number of bits used to represent each digit in the base.  */
 202   mp_limb_t big_base;
 203
 204   /* A BITS_PER_MP_LIMB bit approximation to 1/big_base, represented as a
 205      fixed-point number.  Instead of dividing by big_base an application can
 206      choose to multiply by big_base_inverted.  */
 207   mp_limb_t big_base_inverted;
 208 };
 209
 210 extern const struct bases __mp_bases[];
 211 extern mp_size_t __gmp_default_fp_limb_precision;
 212
 213 /* Divide the two-limb number in (NH,,NL) by D, with DI being the largest
 214    limb not larger than (2**(2*BITS_PER_MP_LIMB))/D - (2**BITS_PER_MP_LIMB).
 215    If this would yield overflow, DI should be the largest possible number
 216    (i.e., only ones).  For correct operation, the most significant bit of D
 217    has to be set.  Put the quotient in Q and the remainder in R.  */
 218 #define udiv_qrnnd_preinv(q, r, nh, nl, d, di) \
 219   do {                                                                  \
 220     mp_limb_t _q, _ql, _r;                                              \
 221     mp_limb_t _xh, _xl;                                                 \
 222     umul_ppmm (_q, _ql, (nh), (di));                                    \
 223     _q += (nh);                 /* DI is 2**BITS_PER_MP_LIMB too small */\
 224     umul_ppmm (_xh, _xl, _q, (d));                                      \
 225     sub_ddmmss (_xh, _r, (nh), (nl), _xh, _xl);                         \
 226     if (_xh != 0)                                                       \
 227       {                                                                 \
 228         sub_ddmmss (_xh, _r, _xh, _r, 0, (d));                          \
 229         _q += 1;                                                        \
 230         if (_xh != 0)                                                   \
 231           {                                                             \
 232             sub_ddmmss (_xh, _r, _xh, _r, 0, (d));                      \
 233             _q += 1;                                                    \
 234           }                                                             \
 235       }                                                                 \
 236     if (_r >= (d))                                                      \
 237       {                                                                 \
 238         _r -= (d);                                                      \
 239         _q += 1;                                                        \
 240       }                                                                 \
 241     (r) = _r;                                                           \
 242     (q) = _q;                                                           \
 243   } while (0)
 244 /* Like udiv_qrnnd_preinv, but for for any value D.  DNORM is D shifted left
 245    so that its most significant bit is set.  LGUP is ceil(log2(D)).  */
 246 #define udiv_qrnnd_preinv2gen(q, r, nh, nl, d, di, dnorm, lgup) \
 247   do {                                                                  \
 248     mp_limb_t n2, n10, n1, nadj, q1;                                    \
 249     mp_limb_t _xh, _xl;                                                 \
 250     n2 = ((nh) << (BITS_PER_MP_LIMB - (lgup))) + ((nl) >> 1 >> (l - 1));\
 251     n10 = (nl) << (BITS_PER_MP_LIMB - (lgup));                          \
 252     n1 = ((mp_limb_signed_t) n10 >> (BITS_PER_MP_LIMB - 1));            \
 253     nadj = n10 + (n1 & (dnorm));                                        \
 254     umul_ppmm (_xh, _xl, di, n2 - n1);                                  \
 255     add_ssaaaa (_xh, _xl, _xh, _xl, 0, nadj);                           \
 256     q1 = ~(n2 + _xh);                                                   \
 257     umul_ppmm (_xh, _xl, q1, d);                                        \
 258     add_ssaaaa (_xh, _xl, _xh, _xl, nh, nl);                            \
 259     _xh -= (d);                                                         \
 260     (r) = _xl + ((d) & _xh);                                            \
 261     (q) = _xh - q1;                                                     \
 262   } while (0)
 263 /* Exactly like udiv_qrnnd_preinv, but branch-free.  It is not clear which
 264    version to use.  */
 265 #define udiv_qrnnd_preinv2norm(q, r, nh, nl, d, di) \
 266   do {                                                                  \
 267     mp_limb_t n2, n10, n1, nadj, q1;                                    \
 268     mp_limb_t _xh, _xl;                                                 \
 269     n2 = (nh);                                                          \
 270     n10 = (nl);                                                         \
 271     n1 = ((mp_limb_signed_t) n10 >> (BITS_PER_MP_LIMB - 1));            \
 272     nadj = n10 + (n1 & (d));                                            \
 273     umul_ppmm (_xh, _xl, di, n2 - n1);                                  \
 274     add_ssaaaa (_xh, _xl, _xh, _xl, 0, nadj);                           \
 275     q1 = ~(n2 + _xh);                                                   \
 276     umul_ppmm (_xh, _xl, q1, d);                                        \
 277     add_ssaaaa (_xh, _xl, _xh, _xl, nh, nl);                            \
 278     _xh -= (d);                                                         \
 279     (r) = _xl + ((d) & _xh);                                            \
 280     (q) = _xh - q1;                                                     \
 281   } while (0)
 282
 283 #if defined (__GNUC__)
 284 /* Define stuff for longlong.h.  */
 285 typedef unsigned int UQItype    __attribute__ ((mode (QI)));
 286 typedef          int SItype     __attribute__ ((mode (SI)));
 287 typedef unsigned int USItype    __attribute__ ((mode (SI)));
 288 typedef          int DItype     __attribute__ ((mode (DI)));
 289 typedef unsigned int UDItype    __attribute__ ((mode (DI)));
 290 #else
 291 typedef unsigned char UQItype;
 292 typedef          long SItype;
 293 typedef unsigned long USItype;
 294 #endif
 295
 296 typedef mp_limb_t UWtype;
 297 typedef unsigned int UHWtype;
 298 #define W_TYPE_SIZE BITS_PER_MP_LIMB
 299
 300 /* Internal mpn calls */
 301 #define impn_mul_n_basecase     __MPN(impn_mul_n_basecase)
 302 #define impn_mul_n              __MPN(impn_mul_n)
 303 #define impn_sqr_n_basecase     __MPN(impn_sqr_n_basecase)
 304 #define impn_sqr_n              __MPN(impn_sqr_n)
 305
 306 #ifndef _PROTO
 307 #if defined (__STDC__) || defined (__cplusplus)
 308 #define _PROTO(x) x
 309 #else
 310 #define _PROTO(x) ()
 311 #endif
 312 #endif
 313
 314 /* Prototypes for internal mpn calls.  */
 315 extern void impn_mul_n_basecase _PROTO ((mp_ptr prodp, mp_srcptr up,
 316                                          mp_srcptr vp, mp_size_t size));
 317 extern void impn_mul_n _PROTO ((mp_ptr prodp, mp_srcptr up, mp_srcptr vp,
 318                                 mp_size_t size, mp_ptr tspace));
 319 extern void impn_sqr_n_basecase _PROTO ((mp_ptr prodp, mp_srcptr up,
 320                                          mp_size_t size));
 321 extern void impn_sqr_n _PROTO ((mp_ptr prodp, mp_srcptr up, mp_size_t size,
 322                                 mp_ptr tspace));
 323
 324
 325
 326 #ifndef IEEE_DOUBLE_BIG_ENDIAN
 327 #define IEEE_DOUBLE_BIG_ENDIAN 1
 328 #endif
 329
 330 #if IEEE_DOUBLE_BIG_ENDIAN
 331 union ieee_double_extract
 332 {
 333   struct
 334     {
 335       unsigned int sig:1;
 336       unsigned int exp:11;
 337       unsigned int manh:20;
 338       unsigned int manl:32;
 339     } s;
 340   double d;
 341 };
 342 #else
 343 union ieee_double_extract
 344 {
 345   struct
 346     {
 347       unsigned int manl:32;
 348       unsigned int manh:20;
 349       unsigned int exp:11;
 350       unsigned int sig:1;
 351     } s;
 352   double d;
 353 };
 354 #endif