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Annotation of OpenXM_contrib/gmp/mpfr/init2.c, Revision 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: }