mirror of
https://https.git.savannah.gnu.org/git/gnulib.git
synced 2026-04-28 06:33:36 +00:00
60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
/* Construct a quiet NaN 'float' with a given payload.
|
|
Copyright 2024-2026 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
|
|
setpayloadf (float *result, float payload)
|
|
{
|
|
#if FLT_MANT_DIG == 24
|
|
if (
|
|
# if defined __hppa || (defined __mips__ && !MIPS_NAN2008_FLOAT) || defined __sh__
|
|
/* A zero payload is not allowed, because that would denote Infinity.
|
|
Cf. snan.h. */
|
|
payload > 0.0f
|
|
# else
|
|
payload >= 0.0f
|
|
# endif
|
|
&& payload < 4194304.0f /* (float) (1U << (FLT_MANT_DIG - 2)) */
|
|
&& payload == (float) (int32_t) payload)
|
|
{
|
|
union { uint32_t i; float f; } x;
|
|
x.f = positive_NaNf ();
|
|
x.i = (x.i & ~(((uint32_t) 1 << (FLT_MANT_DIG - 2)) - 1))
|
|
| (int32_t) payload;
|
|
*result = x.f;
|
|
return 0;
|
|
}
|
|
else
|
|
{
|
|
*result = 0.0f;
|
|
return -1;
|
|
}
|
|
#else
|
|
# error "Please port gnulib setpayloadf.c to your platform!"
|
|
#endif
|
|
}
|