source/libs/gmp/gmp-src/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 either:
   9
  10   * the GNU Lesser General Public License as published by the Free
  11     Software Foundation; either version 3 of the License, or (at your
  12     option) any later version.
  13
  14 or
  15
  16   * the GNU General Public License as published by the Free Software
  17     Foundation; either version 2 of the License, or (at your option) any
  18     later version.
  19
  20 or both in parallel, as here.
  21
  22 The GNU MP Library is distributed in the hope that it will be useful, but
  23 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  24 or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  25 for more details.
  26
  27 You should have received copies of the GNU General Public License and the
  28 GNU Lesser General Public License along with the GNU MP Library.  If not,
  29 see https://www.gnu.org/licenses/.  */
  30
  31 #include "gmp.h"
  32 #include "gmp-impl.h"
  33
  34
  35 void
  36 mpz_ui_pow_ui (mpz_ptr r, unsigned long b, unsigned long e)
  37 {
  38 #if GMP_NAIL_BITS != 0
  39   if (b > GMP_NUMB_MAX)
  40     {
  41       mp_limb_t bb[2];
  42       bb[0] = b & GMP_NUMB_MASK;
  43       bb[1] = b >> GMP_NUMB_BITS;
  44       mpz_n_pow_ui (r, bb, (mp_size_t) 2, e);
  45     }
  46   else
  47 #endif
  48     {
  49 #ifdef _LONG_LONG_LIMB
  50       /* i386 gcc 2.95.3 doesn't recognise blimb can be eliminated when
  51          mp_limb_t is an unsigned long, so only use a separate blimb when
  52          necessary.  */
  53       mp_limb_t  blimb = b;
  54       mpz_n_pow_ui (r, &blimb, (mp_size_t) (b != 0), e);
  55 #else
  56       mpz_n_pow_ui (r, &b,     (mp_size_t) (b != 0), e);
  57 #endif
  58     }
  59 }