cmp_d.c
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上传日期:2022-08-06
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- /* mpf_cmp_d -- compare mpf and double.
- Copyright 2001, 2003 Free Software Foundation, Inc.
- This file is part of the GNU MP Library.
- The GNU MP Library is free software; you can redistribute it and/or modify
- it under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 3 of the License, or (at your
- option) any later version.
- The GNU MP Library is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
- License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
- #include "config.h"
- #if HAVE_FLOAT_H
- #include <float.h> /* for DBL_MAX */
- #endif
- #include "gmp.h"
- #include "gmp-impl.h"
- int
- mpf_cmp_d (mpf_srcptr f, double d)
- {
- mp_limb_t darray[LIMBS_PER_DOUBLE];
- mpf_t df;
- /* d=NaN has no sensible return value, so raise an exception.
- d=Inf or -Inf is always bigger than z. */
- DOUBLE_NAN_INF_ACTION (d,
- __gmp_invalid_operation (),
- return (d < 0.0 ? 1 : -1));
- if (d == 0.0)
- return SIZ(f);
- PTR(df) = darray;
- SIZ(df) = (d >= 0.0 ? LIMBS_PER_DOUBLE : -LIMBS_PER_DOUBLE);
- EXP(df) = __gmp_extract_double (darray, ABS(d));
- return mpf_cmp (f, df);
- }