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/* Extract the payload of a NaN 'long double'.
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>
#if HAVE_SAME_LONG_DOUBLE_AS_DOUBLE
long double
getpayloadl (const long double *value)
{
return getpayload ((const double *) value);
}
#else
# include <float.h>
# include <stdint.h>
# include "snan.h"
/* 2^(LDBL_MANT_DIG-1). */
# define TWO_LDBL_MANT_DIG \
((long double) (1U << ((LDBL_MANT_DIG - 1) / 4)) \
* (long double) (1U << ((LDBL_MANT_DIG - 1 + 1) / 4)) \
* (long double) (1U << ((LDBL_MANT_DIG - 1 + 2) / 4)) \
* (long double) (1U << ((LDBL_MANT_DIG - 1 + 3) / 4)))
long double
getpayloadl (const long double *value)
{
if (isnanl (*value))
{
# if (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 106 || LDBL_MANT_DIG == 113) \
&& defined LDBL_EXPBIT0_WORD && defined LDBL_EXPBIT0_BIT
memory_long_double x;
x.value = *value;
# if LDBL_MANT_DIG == 64 /* on i386, x86_64, ia64, m68k */
int64_t payload;
# if LDBL_EXPBIT0_WORD == 2 && LDBL_EXPBIT0_BIT == 0 /* on i386, x86_64, ia64 */
payload = ((uint64_t) (x.word[1] & 0x3FFFFFFFU) << 32) | x.word[0];
# elif LDBL_EXPBIT0_WORD == 0 && LDBL_EXPBIT0_BIT == 16 /* on m68k */
payload = ((uint64_t) (x.word[1] & 0x3FFFFFFFU) << 32) | x.word[2];
# else
# error "Please port gnulib getpayloadl.c to your platform!"
# endif
return payload;
# endif
# if LDBL_MANT_DIG == 106 /* on powerpc, powerpc64, powerpc64le */
int64_t payload;
# if LDBL_EXPBIT0_BIT == 20
payload = ((uint64_t) (x.word[LDBL_EXPBIT0_WORD] & 0x0007FFFFU) << 32)
| x.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD == 0 ? 1 : -1)];
# else
# error "Please port gnulib getpayloadl.c to your platform!"
# endif
return payload;
# endif
# if LDBL_MANT_DIG == 113 /* on alpha, arm64, loongarch64, mips64, riscv64, s390x, sparc64 */
# if LDBL_EXPBIT0_BIT == 16
memory_long_double pl;
pl.value = TWO_LDBL_MANT_DIG;
pl.word[LDBL_EXPBIT0_WORD] |= x.word[LDBL_EXPBIT0_WORD] & 0x00007FFFU;
pl.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD == 0 ? 1 : -1)] =
x.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD == 0 ? 1 : -1)];
pl.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD == 0 ? 2 : -2)] =
x.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD == 0 ? 2 : -2)];
pl.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD == 0 ? 3 : -3)] =
x.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD == 0 ? 3 : -3)];
return pl.value - TWO_LDBL_MANT_DIG;
# else
# error "Please port gnulib getpayloadl.c to your platform!"
# endif
# endif
# else
# error "Please port gnulib getpayloadl.c to your platform!"
# endif
}
else
return -1.0L;
}
#endif
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