pow_ui.c
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上传日期:2022-08-06
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- /* mpz_pow_ui -- mpz raised to ulong.
- Copyright 2001, 2008 Free Software Foundation, Inc.
- This file is part of the GNU MP Library.
- The GNU MP Library is free software; you can redistribute it and/or modify
- it under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 3 of the License, or (at your
- option) any later version.
- The GNU MP Library is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
- License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
- #include "gmp.h"
- #include "gmp-impl.h"
- void
- mpz_pow_ui (mpz_ptr r, mpz_srcptr b, unsigned long int e)
- {
- /* We test some small exponents here, mainly to avoid the overhead of
- mpz_n_pow_ui for small bases and exponents. */
- switch (e)
- {
- case 0:
- mpz_set_ui (r, 1);
- break;
- case 1:
- mpz_set (r, b);
- break;
- case 2:
- mpz_mul (r, b, b);
- break;
- default:
- mpz_n_pow_ui (r, PTR(b), (mp_size_t) SIZ(b), e);
- }
- }