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58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
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/* mpfr_add_si -- add a floating-point number with a machine integer
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mpfr_sub_si -- sub a floating-point number with a machine integer
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mpfr_si_sub -- sub a machine number with a floating-point number
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Copyright 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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int
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mpfr_add_si (mpfr_ptr y, mpfr_srcptr x, long int u, mp_rnd_t rnd_mode)
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{
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if (u >= 0)
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return mpfr_add_ui (y, x, u, rnd_mode);
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else
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return mpfr_sub_ui (y, x, -u, rnd_mode);
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}
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int
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mpfr_sub_si (mpfr_ptr y, mpfr_srcptr x, long int u, mp_rnd_t rnd_mode)
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{
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if (u >= 0)
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return mpfr_sub_ui (y, x, u, rnd_mode);
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else
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return mpfr_add_ui (y, x, -u, rnd_mode);
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}
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int
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mpfr_si_sub (mpfr_ptr y, long int u, mpfr_srcptr x, mp_rnd_t rnd_mode)
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{
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if (u >= 0)
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return mpfr_ui_sub (y, u, x, rnd_mode);
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else
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{
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int res = -mpfr_add_ui (y, x, -u, MPFR_INVERT_RND (rnd_mode));
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MPFR_CHANGE_SIGN (y);
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return res;
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}
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}
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