46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
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/* mpf_pow_ui -- Compute b^e.
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Copyright 1998, 1999, 2001 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "gmp.h"
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#include "gmp-impl.h"
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void
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mpf_pow_ui (mpf_ptr r, mpf_srcptr b, unsigned long int e)
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{
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mpf_t b2;
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unsigned long int e2;
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mpf_init2 (b2, mpf_get_prec (r));
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mpf_set (b2, b);
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mpf_set_ui (r, 1);
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if ((e & 1) != 0)
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mpf_set (r, b2);
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for (e2 = e >> 1; e2 != 0; e2 >>= 1)
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{
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mpf_mul (b2, b2, b2);
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if ((e2 & 1) != 0)
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mpf_mul (r, r, b2);
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}
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mpf_clear (b2);
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}
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