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git-svn-id: file:///srv/svn/repos/haiku/buildtools/trunk@29042 a95241bf-73f2-0310-859d-f6bbb57e9c96
82 lines
2.6 KiB
C
82 lines
2.6 KiB
C
/* mpfr_set -- copy of a floating-point number
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Copyright 1999, 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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/* set a to abs(b) * signb: a=b when signb = SIGN(b), a=abs(b) when signb=1 */
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int
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mpfr_set4 (mpfr_ptr a, mpfr_srcptr b, mp_rnd_t rnd_mode, int signb)
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{
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/* Sign is ALWAYS copied */
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MPFR_SET_SIGN (a, signb);
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/* Exponent is also always copied since if the number is singular,
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the exponent field determined the number.
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Can't use MPFR_SET_EXP since the exponent may be singular */
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MPFR_EXP (a) = MPFR_EXP (b);
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if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (b)))
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{
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/* MPFR_SET_NAN, MPFR_SET_ZERO and MPFR_SET_INF are useless
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since MPFR_EXP (a) = MPFR_EXP (b) does the job */
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if (MPFR_IS_NAN (b))
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MPFR_RET_NAN;
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else
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MPFR_RET (0);
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}
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else if (MPFR_LIKELY (MPFR_PREC (b) == MPFR_PREC (a)))
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{
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/* Same precision and b is not singular:
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* just copy the mantissa, and set the exponent and the sign
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* The result is exact. */
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MPN_COPY (MPFR_MANT (a), MPFR_MANT (b),
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(MPFR_PREC (b) + BITS_PER_MP_LIMB-1)/BITS_PER_MP_LIMB);
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MPFR_RET (0);
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}
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else
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{
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int inex;
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/* Else Round B inside a */
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MPFR_RNDRAW (inex, a, MPFR_MANT (b), MPFR_PREC (b), rnd_mode, signb,
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if (MPFR_UNLIKELY ( ++MPFR_EXP (a) > __gmpfr_emax))
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return mpfr_overflow (a, rnd_mode, signb) );
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MPFR_RET (inex);
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}
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}
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/* Set a to b */
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#undef mpfr_set
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int
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mpfr_set (mpfr_ptr a, mpfr_srcptr b, mp_rnd_t rnd_mode)
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{
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return mpfr_set4 (a, b, rnd_mode, MPFR_SIGN (b));
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}
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/* Set a to |b| */
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#undef mpfr_abs
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int
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mpfr_abs (mpfr_ptr a, mpfr_srcptr b, mp_rnd_t rnd_mode)
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{
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return mpfr_set4 (a, b, rnd_mode, MPFR_SIGN_POS);
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}
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