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Annotation of OpenXM_contrib/gmp/mpf/pow_ui.c, Revision 1.1

1.1     ! maekawa     1: /* mpf_pow_ui -- Compute b^e.
        !             2:
        !             3: Copyright (C) 1998, 1999 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 2.1 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; see the file COPYING.LIB.  If not, write to
        !            19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            20: MA 02111-1307, USA. */
        !            21:
        !            22: #include "gmp.h"
        !            23: #include "gmp-impl.h"
        !            24:
        !            25: void
        !            26: #if __STDC__
        !            27: mpf_pow_ui (mpf_ptr r, mpf_srcptr b, unsigned long int e)
        !            28: #else
        !            29: mpf_pow_ui (r, b, e)
        !            30:      mpf_ptr r;
        !            31:      mpf_srcptr b;
        !            32:      unsigned long int e;
        !            33: #endif
        !            34: {
        !            35:   mpf_t b2;
        !            36:   unsigned long int e2;
        !            37:
        !            38:   mpf_init2 (b2, mpf_get_prec (r));
        !            39:   mpf_set (b2, b);
        !            40:   mpf_set_ui (r, 1);
        !            41:
        !            42:   if ((e & 1) != 0)
        !            43:     mpf_set (r, b2);
        !            44:   for (e2 = e >> 1; e2 != 0; e2 >>= 1)
        !            45:     {
        !            46:       mpf_mul (b2, b2, b2);
        !            47:       if ((e2 & 1) != 0)
        !            48:        mpf_mul (r, r, b2);
        !            49:     }
        !            50:
        !            51:   mpf_clear (b2);
        !            52: }