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105 lines
2.6 KiB
C
105 lines
2.6 KiB
C
/* mpfr_cmp -- compare two floating-point numbers
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Copyright 1999, 2001, 2003, 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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/* returns 0 iff b = sign(s) * c
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a positive value iff b > sign(s) * c
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a negative value iff b < sign(s) * c
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returns 0 and sets erange flag if b and/or c is NaN.
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*/
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int
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mpfr_cmp3 (mpfr_srcptr b, mpfr_srcptr c, int s)
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{
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mp_exp_t be, ce;
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mp_size_t bn, cn;
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mp_limb_t *bp, *cp;
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s = MPFR_MULT_SIGN( s , MPFR_SIGN(c) );
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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_ERANGE ();
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return 0;
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}
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else if (MPFR_IS_INF(b))
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{
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if (MPFR_IS_INF(c) && s == MPFR_SIGN(b) )
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return 0;
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else
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return MPFR_SIGN(b);
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}
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else if (MPFR_IS_INF(c))
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return -s;
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else if (MPFR_IS_ZERO(b))
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return MPFR_IS_ZERO(c) ? 0 : -s;
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else /* necessarily c=0 */
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return MPFR_SIGN(b);
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}
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/* b and c are real numbers */
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if (s != MPFR_SIGN(b))
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return MPFR_SIGN(b);
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/* now signs are equal */
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be = MPFR_GET_EXP (b);
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ce = MPFR_GET_EXP (c);
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if (be > ce)
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return s;
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if (be < ce)
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return -s;
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/* both signs and exponents are equal */
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bn = (MPFR_PREC(b)-1)/BITS_PER_MP_LIMB;
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cn = (MPFR_PREC(c)-1)/BITS_PER_MP_LIMB;
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bp = MPFR_MANT(b);
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cp = MPFR_MANT(c);
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for ( ; bn >= 0 && cn >= 0; bn--, cn--)
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{
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if (bp[bn] > cp[cn])
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return s;
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if (bp[bn] < cp[cn])
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return -s;
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}
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for ( ; bn >= 0; bn--)
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if (bp[bn])
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return s;
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for ( ; cn >= 0; cn--)
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if (cp[cn])
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return -s;
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return 0;
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}
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#undef mpfr_cmp
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int
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mpfr_cmp (mpfr_srcptr b, mpfr_srcptr c)
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{
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return mpfr_cmp3 (b, c, 1);
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}
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