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b58ddff026
* merged mpfr 3.0.0 and gmp 5.0.1 in buildtools trunk git-svn-id: file:///srv/svn/repos/haiku/buildtools/trunk@37378 a95241bf-73f2-0310-859d-f6bbb57e9c96
99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
/* mpfr_modf -- Integral and fractional part.
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Copyright 2007, 2008, 2009, 2010 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 GNU MPFR Library.
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The GNU 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 3 of the License, or (at your
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option) any later version.
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The GNU 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 GNU MPFR Library; see the file COPYING.LESSER. If not, see
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http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
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51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
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#include "mpfr-impl.h"
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#define INEXPOS(y) ((y) == 0 ? 0 : (((y) > 0) ? 1 : 2))
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#define INEX(y,z) (INEXPOS(y) | (INEXPOS(z) << 2))
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/* Set iop to the integral part of op and fop to its fractional part */
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int
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mpfr_modf (mpfr_ptr iop, mpfr_ptr fop, mpfr_srcptr op, mpfr_rnd_t rnd_mode)
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{
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mpfr_exp_t ope;
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mpfr_prec_t opq;
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int inexi, inexf;
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MPFR_LOG_FUNC (("op[%#R]=%R rnd=%d", op, op, rnd_mode),
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("iop[%#R]=%R fop[%#R]=%R", iop, iop, fop, fop));
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MPFR_ASSERTN (iop != fop);
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if ( MPFR_UNLIKELY (MPFR_IS_SINGULAR (op)) )
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{
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if (MPFR_IS_NAN (op))
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{
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MPFR_SET_NAN (iop);
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MPFR_SET_NAN (fop);
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MPFR_RET_NAN;
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}
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MPFR_SET_SAME_SIGN (iop, op);
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MPFR_SET_SAME_SIGN (fop, op);
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if (MPFR_IS_INF (op))
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{
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MPFR_SET_INF (iop);
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MPFR_SET_ZERO (fop);
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MPFR_RET (0);
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}
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else /* op is zero */
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{
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MPFR_ASSERTD (MPFR_IS_ZERO (op));
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MPFR_SET_ZERO (iop);
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MPFR_SET_ZERO (fop);
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MPFR_RET (0);
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}
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}
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ope = MPFR_GET_EXP (op);
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opq = MPFR_PREC (op);
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if (ope <= 0) /* 0 < |op| < 1 */
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{
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inexf = (fop != op) ? mpfr_set (fop, op, rnd_mode) : 0;
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MPFR_SET_SAME_SIGN (iop, op);
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MPFR_SET_ZERO (iop);
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MPFR_RET (INEX(0, inexf));
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}
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else if (ope >= opq) /* op has no fractional part */
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{
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inexi = (iop != op) ? mpfr_set (iop, op, rnd_mode) : 0;
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MPFR_SET_SAME_SIGN (fop, op);
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MPFR_SET_ZERO (fop);
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MPFR_RET (INEX(inexi, 0));
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}
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else /* op has both integral and fractional parts */
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{
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if (iop != op)
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{
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inexi = mpfr_rint_trunc (iop, op, rnd_mode);
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inexf = mpfr_frac (fop, op, rnd_mode);
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}
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else
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{
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MPFR_ASSERTN (fop != op);
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inexf = mpfr_frac (fop, op, rnd_mode);
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inexi = mpfr_rint_trunc (iop, op, rnd_mode);
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}
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MPFR_RET (INEX(inexi, inexf));
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}
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}
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