contrib/gmp/mpz/ui_pow_ui.c

   1 /* mpz_ui_pow_ui -- ulong raised to ulong.
   2
   3 Copyright 2001, 2002 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 Lesser General Public License as published by
   9 the Free Software Foundation; either version 3 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 Lesser General Public
  15 License for more details.
  16
  17 You should have received a copy of the GNU Lesser General Public License
  18 along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
  19
  20 #include "gmp.h"
  21 #include "gmp-impl.h"
  22
  23
  24 void
  25 mpz_ui_pow_ui (mpz_ptr r, unsigned long b, unsigned long e)
  26 {
  27 #if GMP_NAIL_BITS != 0
  28   if (b > GMP_NUMB_MAX)
  29     {
  30       mp_limb_t bb[2];
  31       bb[0] = b & GMP_NUMB_MASK;
  32       bb[1] = b >> GMP_NUMB_BITS;
  33       mpz_n_pow_ui (r, bb, (mp_size_t) 2, e);
  34     }
  35   else
  36 #endif
  37     {
  38 #ifdef _LONG_LONG_LIMB
  39       /* i386 gcc 2.95.3 doesn't recognise blimb can be eliminated when
  40          mp_limb_t is an unsigned long, so only use a separate blimb when
  41          necessary.  */
  42       mp_limb_t  blimb = b;
  43       mpz_n_pow_ui (r, &blimb, (mp_size_t) (b != 0), e);
  44 #else
  45       mpz_n_pow_ui (r, &b,     (mp_size_t) (b != 0), e);
  46 #endif
  47     }
  48 }