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/* Construct a quiet NaN 'double' with a given payload.
Copyright 2024-2025 Free Software Foundation, Inc.
This file 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.
This file 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 this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible. */
#include <config.h>
/* Specification. */
#include <math.h>
#include <float.h>
#include <stdint.h>
#include "signed-nan.h"
int
setpayload (double *result, double payload)
{
#if DBL_MANT_DIG == 53
if (
# if defined __hppa || (defined __mips__ && !MIPS_NAN2008_DOUBLE) || defined __sh__
/* A zero payload is not allowed, because that would denote Infinity.
Cf. snan.h. */
payload > 0.0
# else
payload >= 0.0
# endif
&& payload < 2251799813685248.0 /* (double) (1ULL << (DBL_MANT_DIG - 2)) */
&& payload == (double) (int64_t) payload)
{
union { uint64_t i; double f; } x;
x.f = positive_NaNd ();
x.i = (x.i & ~(((uint64_t) 1 << (DBL_MANT_DIG - 2)) - 1))
| (int64_t) payload;
*result = x.f;
return 0;
}
else
{
*result = 0.0;
return -1;
}
#else
# error "Please port gnulib setpayload.c to your platform!"
#endif
}
|
