pow_ui.c
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上传日期:2022-08-06
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- /* mpf_pow_ui -- Compute b^e.
- Copyright 1998, 1999, 2001 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
- mpf_pow_ui (mpf_ptr r, mpf_srcptr b, unsigned long int e)
- {
- mpf_t b2;
- unsigned long int e2;
- mpf_init2 (b2, mpf_get_prec (r));
- mpf_set (b2, b);
- mpf_set_ui (r, 1);
- if ((e & 1) != 0)
- mpf_set (r, b2);
- for (e2 = e >> 1; e2 != 0; e2 >>= 1)
- {
- mpf_mul (b2, b2, b2);
- if ((e2 & 1) != 0)
- mpf_mul (r, r, b2);
- }
- mpf_clear (b2);
- }