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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
58 lines
2.1 KiB
C
58 lines
2.1 KiB
C
/* mpfr_div_2si -- divide a floating-point number by a power of two
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Copyright 1999, 2001, 2002, 2003, 2004, 2005, 2006, 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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int
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mpfr_div_2si (mpfr_ptr y, mpfr_srcptr x, long int n, mpfr_rnd_t rnd_mode)
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{
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int inexact;
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MPFR_LOG_FUNC (("x[%#R]=%R n=%ld rnd=%d", x, x, n, rnd_mode),
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("y[%#R]=%R inexact=%d", y, y, inexact));
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inexact = MPFR_UNLIKELY(y != x) ? mpfr_set (y, x, rnd_mode) : 0;
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if (MPFR_LIKELY( MPFR_IS_PURE_FP(y) ))
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{
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mpfr_exp_t exp = MPFR_GET_EXP (y);
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if (MPFR_UNLIKELY( n > 0 && (__gmpfr_emin > MPFR_EMAX_MAX - n ||
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exp < __gmpfr_emin + n)) )
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{
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if (rnd_mode == MPFR_RNDN &&
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(__gmpfr_emin > MPFR_EMAX_MAX - (n - 1) ||
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exp < __gmpfr_emin + (n - 1) ||
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(inexact >= 0 && mpfr_powerof2_raw (y))))
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rnd_mode = MPFR_RNDZ;
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return mpfr_underflow (y, rnd_mode, MPFR_SIGN(y));
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}
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if (MPFR_UNLIKELY(n < 0 && (__gmpfr_emax < MPFR_EMIN_MIN - n ||
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exp > __gmpfr_emax + n)) )
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return mpfr_overflow (y, rnd_mode, MPFR_SIGN(y));
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MPFR_SET_EXP (y, exp - n);
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}
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return inexact;
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}
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