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git-svn-id: file:///srv/svn/repos/haiku/buildtools/trunk@29042 a95241bf-73f2-0310-859d-f6bbb57e9c96
106 lines
3.3 KiB
C
106 lines
3.3 KiB
C
/* mpfr_add -- add two floating-point numbers
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Copyright 1999, 2000, 2001, 2002, 2003, 2004, 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 (mpfr_ptr a, mpfr_srcptr b, mpfr_srcptr c, mp_rnd_t rnd_mode)
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{
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MPFR_LOG_FUNC (("b[%#R]=%R c[%#R]=%R rnd=%d", b, b, c, c, rnd_mode),
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("a[%#R]=%R", a, a));
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if (MPFR_ARE_SINGULAR(b,c))
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{
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if (MPFR_IS_NAN(b) || MPFR_IS_NAN(c))
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{
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MPFR_SET_NAN(a);
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MPFR_RET_NAN;
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}
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/* neither b nor c is NaN here */
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else if (MPFR_IS_INF(b))
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{
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if (!MPFR_IS_INF(c) || MPFR_SIGN(b) == MPFR_SIGN(c))
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{
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MPFR_SET_INF(a);
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MPFR_SET_SAME_SIGN(a, b);
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MPFR_RET(0); /* exact */
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}
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else
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{
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MPFR_SET_NAN(a);
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MPFR_RET_NAN;
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}
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}
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else if (MPFR_IS_INF(c))
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{
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MPFR_SET_INF(a);
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MPFR_SET_SAME_SIGN(a, c);
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MPFR_RET(0); /* exact */
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}
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/* now either b or c is zero */
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else if (MPFR_IS_ZERO(b))
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{
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if (MPFR_IS_ZERO(c))
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{
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MPFR_SET_SIGN(a,
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(rnd_mode != GMP_RNDD ?
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((MPFR_IS_NEG(b) && MPFR_IS_NEG(c)) ? -1 : 1) :
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((MPFR_IS_POS(b) && MPFR_IS_POS(c)) ? 1 : -1)));
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MPFR_SET_ZERO(a);
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MPFR_RET(0); /* 0 + 0 is exact */
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}
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return mpfr_set (a, c, rnd_mode);
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}
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else
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{
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MPFR_ASSERTD(MPFR_IS_ZERO(c));
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return mpfr_set (a, b, rnd_mode);
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}
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}
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MPFR_ASSERTD(MPFR_IS_PURE_FP(b) && MPFR_IS_PURE_FP(c));
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MPFR_CLEAR_FLAGS(a); /* clear flags */
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if (MPFR_UNLIKELY(MPFR_SIGN(b) != MPFR_SIGN(c)))
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{ /* signs differ, it's a subtraction */
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if (MPFR_LIKELY(MPFR_PREC(a) == MPFR_PREC(b)
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&& MPFR_PREC(b) == MPFR_PREC(c)))
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return mpfr_sub1sp(a,b,c,rnd_mode);
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else
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return mpfr_sub1(a, b, c, rnd_mode);
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}
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else
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{ /* signs are equal, it's an addition */
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if (MPFR_LIKELY(MPFR_PREC(a) == MPFR_PREC(b)
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&& MPFR_PREC(b) == MPFR_PREC(c)))
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if (MPFR_GET_EXP(b) < MPFR_GET_EXP(c))
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return mpfr_add1sp(a, c, b, rnd_mode);
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else
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return mpfr_add1sp(a, b, c, rnd_mode);
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else
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if (MPFR_GET_EXP(b) < MPFR_GET_EXP(c))
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return mpfr_add1(a, c, b, rnd_mode);
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else
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return mpfr_add1(a, b, c, rnd_mode);
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}
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}
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