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Annotation of OpenXM_contrib/gmp/mpfr/init2.c, Revision 1.1.1.1

1.1       ohara       1: /* mpfr_init2 -- initialize a floating-point number with given precision
                      2:
                      3: Copyright 2001 Free Software Foundation, Inc.
                      4:
                      5: This file is part of the MPFR Library.
                      6:
                      7: The MPFR 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 MPFR 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 MPFR 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: #include "mpfr.h"
                     25: #include "mpfr-impl.h"
                     26:
                     27: void
                     28: mpfr_init2 (mpfr_ptr x, mp_prec_t p)
                     29: {
                     30:   mp_size_t xsize;
                     31:
                     32:   /* p=1 is not allowed since the rounding to nearest even rule requires at
                     33:      least two bits of mantissa: the neighbours of 3/2 are 1*2^0 and 1*2^1,
                     34:      which both have an odd mantissa */
                     35:   MPFR_ASSERTN(p >= MPFR_PREC_MIN && p <= MPFR_PREC_MAX);
                     36:
                     37:   xsize = (mp_size_t) ((p - 1) / BITS_PER_MP_LIMB) + 1;
                     38:
                     39:   MPFR_PREC(x) = p;
                     40:   MPFR_MANT(x) = (mp_ptr)
                     41:     (*__gmp_allocate_func) ((size_t) xsize * BYTES_PER_MP_LIMB);
                     42:   MPFR_SIZE(x) = xsize;
                     43:   MPFR_SET_NAN(x); /* initializes to NaN */
                     44: }