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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
55 lines
1.9 KiB
C
55 lines
1.9 KiB
C
/* mpfr_sub_ui -- subtract a floating-point number and a machine integer
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Copyright 2000, 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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#define MPFR_NEED_LONGLONG_H
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#include "mpfr-impl.h"
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int
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mpfr_sub_ui (mpfr_ptr y, mpfr_srcptr x, unsigned long int u, mpfr_rnd_t rnd_mode)
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{
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if (MPFR_LIKELY (u != 0)) /* if u=0, do nothing */
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{
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mpfr_t uu;
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mp_limb_t up[1];
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unsigned long cnt;
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int inex;
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MPFR_SAVE_EXPO_DECL (expo);
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MPFR_TMP_INIT1 (up, uu, GMP_NUMB_BITS);
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MPFR_ASSERTN (u == (mp_limb_t) u);
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count_leading_zeros (cnt, (mp_limb_t) u);
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*up = (mp_limb_t) u << cnt;
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/* Optimization note: Exponent save/restore operations may be
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removed if mpfr_sub works even when uu is out-of-range. */
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MPFR_SAVE_EXPO_MARK (expo);
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MPFR_SET_EXP (uu, GMP_NUMB_BITS - cnt);
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inex = mpfr_sub (y, x, uu, rnd_mode);
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MPFR_SAVE_EXPO_FREE (expo);
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return mpfr_check_range (y, inex, rnd_mode);
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}
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else
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return mpfr_set (y, x, rnd_mode);
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}
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