isl_gmp.c

   1 /*
   2  * Copyright 2008-2009 Katholieke Universiteit Leuven
   3  *
   4  * Use of this software is governed by the GNU LGPLv2.1 license
   5  *
   6  * Written by Sven Verdoolaege, K.U.Leuven, Departement
   7  * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium
   8  */
   9
  10 #include <isl/int.h>
  11
  12 uint32_t isl_gmp_hash(mpz_t v, uint32_t hash)
  13 {
  14         int sa = v[0]._mp_size;
  15         int abs_sa = sa < 0 ? -sa : sa;
  16         unsigned char *data = (unsigned char *)v[0]._mp_d;
  17         unsigned char *end = data + abs_sa * sizeof(v[0]._mp_d[0]);
  18
  19         if (sa < 0)
  20                 isl_hash_byte(hash, 0xFF);
  21         for (; data < end; ++data)
  22                 isl_hash_byte(hash, *data);
  23         return hash;
  24 }