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Annotation of OpenXM_contrib/gmp/mpf/sqrt_ui.c, Revision 1.1.1.1

1.1       maekawa     1: /* mpf_sqrt_ui -- Compute the square root of an unsigned integer.
                      2:
                      3: Copyright (C) 1993, 1994, 1996 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 Library General Public License as published by
                      9: the Free Software Foundation; either version 2 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 Library General Public
                     15: License for more details.
                     16:
                     17: You should have received a copy of the GNU Library 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_sqrt_ui (mpf_ptr r, unsigned long int u)
                     28: #else
                     29: mpf_sqrt_ui (r, u)
                     30:      mpf_ptr r;
                     31:      unsigned long int u;
                     32: #endif
                     33: {
                     34:   mp_size_t rsize;
                     35:   mp_ptr tp;
                     36:   mp_size_t prec;
                     37:   TMP_DECL (marker);
                     38:
                     39:   if (u == 0)
                     40:     {
                     41:       r->_mp_size = 0;
                     42:       r->_mp_exp = 0;
                     43:       return;
                     44:     }
                     45:
                     46:   TMP_MARK (marker);
                     47:
                     48:   prec = r->_mp_prec;
                     49:   rsize = 2 * prec + 1;
                     50:
                     51:   tp = (mp_ptr) TMP_ALLOC (rsize * BYTES_PER_MP_LIMB);
                     52:
                     53:   MPN_ZERO (tp, rsize - 1);
                     54:   tp[rsize - 1] = u;
                     55:
                     56:   mpn_sqrtrem (r->_mp_d, NULL, tp, rsize);
                     57:
                     58:   r->_mp_size = prec + 1;
                     59:   r->_mp_exp = 1;
                     60:   TMP_FREE (marker);
                     61: }