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git-svn-id: file:///srv/svn/repos/haiku/buildtools/trunk@29042 a95241bf-73f2-0310-859d-f6bbb57e9c96
68 lines
2.7 KiB
C
68 lines
2.7 KiB
C
/* mpfr_init2 -- initialize a floating-point number with given precision
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Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
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Contributed by the Arenaire and Cacao projects, INRIA.
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This file is part of the MPFR Library.
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The MPFR 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 MPFR 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 MPFR Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "mpfr-impl.h"
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void
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mpfr_init2 (mpfr_ptr x, mp_prec_t p)
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{
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mp_size_t xsize;
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mp_ptr tmp;
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/* Check if we can represent the number of limbs
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* associated to the maximum of mpfr_prec_t*/
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MPFR_ASSERTN( MP_SIZE_T_MAX >= (MPFR_PREC_MAX/BYTES_PER_MP_LIMB) );
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/* Check for correct BITS_PER_MP_LIMB and BYTES_PER_MP_LIMB */
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MPFR_ASSERTN( BITS_PER_MP_LIMB == BYTES_PER_MP_LIMB * CHAR_BIT
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&& sizeof(mp_limb_t) == BYTES_PER_MP_LIMB );
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/* Check for correct EXP NAN, ZERO & INF in both mpfr.h and in mpfr-impl.h */
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MPFR_ASSERTN( __MPFR_EXP_NAN == MPFR_EXP_NAN );
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MPFR_ASSERTN( __MPFR_EXP_ZERO == MPFR_EXP_ZERO );
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MPFR_ASSERTN( __MPFR_EXP_INF == MPFR_EXP_INF );
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MPFR_ASSERTN( MPFR_EMAX_MAX <= (MPFR_EXP_MAX >> 1) );
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MPFR_ASSERTN( MPFR_EMIN_MIN >= -(MPFR_EXP_MAX >> 1) );
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/* p=1 is not allowed since the rounding to nearest even rule requires at
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least two bits of mantissa: the neighbours of 3/2 are 1*2^0 and 1*2^1,
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which both have an odd mantissa */
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MPFR_ASSERTN(p >= MPFR_PREC_MIN && p <= MPFR_PREC_MAX);
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xsize = (mp_size_t) ((p - 1) / BITS_PER_MP_LIMB) + 1;
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tmp = (mp_ptr) (*__gmp_allocate_func)(MPFR_MALLOC_SIZE(xsize));
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MPFR_PREC(x) = p; /* Set prec */
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MPFR_EXP (x) = MPFR_EXP_INVALID; /* make sure that the exp field has a
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valid value in the C point of view */
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MPFR_SET_POS(x); /* Set a sign */
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MPFR_SET_MANT_PTR(x, tmp); /* Set Mantissa ptr */
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MPFR_SET_ALLOC_SIZE(x, xsize); /* Fix alloc size of Mantissa */
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MPFR_SET_NAN(x); /* initializes to NaN */
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}
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#ifdef MPFR_USE_OWN_MPFR_TMP_ALLOC
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static unsigned char mpfr_stack_tab[8000000];
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unsigned char *mpfr_stack = mpfr_stack_tab;
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#endif
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