mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-25 06:20:06 +00:00
101 lines
2.7 KiB
C
101 lines
2.7 KiB
C
/* Manipulation of the bit representation of 'long double' quantities.
|
|
Copyright (C) 2001-2024 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C 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 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C 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 C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _MATH_LDBL_H_
|
|
#define _MATH_LDBL_H_ 1
|
|
|
|
#include <stdint.h>
|
|
|
|
/* A union which permits us to convert between a long double and
|
|
three 32 bit ints. */
|
|
|
|
typedef union
|
|
{
|
|
long double value;
|
|
struct
|
|
{
|
|
uint32_t lsw;
|
|
uint32_t msw;
|
|
int sign_exponent:16;
|
|
unsigned int empty1:16;
|
|
unsigned int empty0:32;
|
|
} parts;
|
|
} ieee_long_double_shape_type;
|
|
|
|
/* Get three 32 bit ints from a double. */
|
|
|
|
#define GET_LDOUBLE_WORDS(exp,ix0,ix1,d) \
|
|
do { \
|
|
ieee_long_double_shape_type ew_u; \
|
|
ew_u.value = (d); \
|
|
(exp) = ew_u.parts.sign_exponent; \
|
|
(ix0) = ew_u.parts.msw; \
|
|
(ix1) = ew_u.parts.lsw; \
|
|
} while (0)
|
|
|
|
/* Set a double from two 32 bit ints. */
|
|
|
|
#define SET_LDOUBLE_WORDS(d,exp,ix0,ix1) \
|
|
do { \
|
|
ieee_long_double_shape_type iw_u; \
|
|
iw_u.parts.sign_exponent = (exp); \
|
|
iw_u.parts.msw = (ix0); \
|
|
iw_u.parts.lsw = (ix1); \
|
|
(d) = iw_u.value; \
|
|
} while (0)
|
|
|
|
/* Get the more significant 32 bits of a long double mantissa. */
|
|
|
|
#define GET_LDOUBLE_MSW(v,d) \
|
|
do { \
|
|
ieee_long_double_shape_type sh_u; \
|
|
sh_u.value = (d); \
|
|
(v) = sh_u.parts.msw; \
|
|
} while (0)
|
|
|
|
/* Set the more significant 32 bits of a long double mantissa from an int. */
|
|
|
|
#define SET_LDOUBLE_MSW(d,v) \
|
|
do { \
|
|
ieee_long_double_shape_type sh_u; \
|
|
sh_u.value = (d); \
|
|
sh_u.parts.msw = (v); \
|
|
(d) = sh_u.value; \
|
|
} while (0)
|
|
|
|
/* Get int from the exponent of a long double. */
|
|
|
|
#define GET_LDOUBLE_EXP(exp,d) \
|
|
do { \
|
|
ieee_long_double_shape_type ge_u; \
|
|
ge_u.value = (d); \
|
|
(exp) = ge_u.parts.sign_exponent; \
|
|
} while (0)
|
|
|
|
/* Set exponent of a long double from an int. */
|
|
|
|
#define SET_LDOUBLE_EXP(d,exp) \
|
|
do { \
|
|
ieee_long_double_shape_type se_u; \
|
|
se_u.value = (d); \
|
|
se_u.parts.sign_exponent = (exp); \
|
|
(d) = se_u.value; \
|
|
} while (0)
|
|
|
|
#endif /* math_ldbl.h */
|