21f9dd806f
bit in a long double. For architectures that don't have such a bit, LDBL_NBIT is 0. This makes it possible to say `mantissa & ~LDBL_NBIT' in places that previously used an #ifdef to select the right expression. The optimizer should dispense with the extra arithmetic when LDBL_NBIT is 0 anyway. - Add an XXX comment for the big endian case.
72 lines
2.4 KiB
C
72 lines
2.4 KiB
C
/*-
|
|
* Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org>
|
|
* Copyright (c) 2002, 2003 David Schultz <das@FreeBSD.ORG>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <sys/endian.h>
|
|
|
|
union IEEEl2bits {
|
|
long double e;
|
|
struct {
|
|
#if _BYTE_ORDER == _LITTLE_ENDIAN
|
|
unsigned int manl :32;
|
|
unsigned int manh :32;
|
|
unsigned int exp :15;
|
|
unsigned int sign :1;
|
|
unsigned long junk :48;
|
|
#else /* _BIG_ENDIAN */
|
|
unsigned long junk :48;
|
|
unsigned int sign :1;
|
|
unsigned int exp :15;
|
|
unsigned int manh :32;
|
|
unsigned int manl :32;
|
|
#endif
|
|
} bits;
|
|
};
|
|
|
|
#if _BYTE_ORDER == _LITTLE_ENDIAN
|
|
#define LDBL_NBIT 0x80000000
|
|
#define mask_nbit_l(u) ((u).bits.manh &= ~LDBL_NBIT)
|
|
#else /* _BIG_ENDIAN */
|
|
/*
|
|
* XXX This doesn't look right. Very few machines have a different
|
|
* endianness for integers and floating-point, and in nextafterl()
|
|
* we assume that none do. If you have an environment for testing
|
|
* this, please let me know. --das
|
|
*/
|
|
#define LDBL_NBIT 0x80
|
|
#define mask_nbit_l(u) ((u).bits.manh &= ~LDBL_NBIT)
|
|
#endif
|
|
|
|
#define LDBL_MANH_SIZE 32
|
|
#define LDBL_MANL_SIZE 32
|
|
|
|
#define LDBL_TO_ARRAY32(u, a) do { \
|
|
(a)[0] = (uint32_t)(u).bits.manl; \
|
|
(a)[1] = (uint32_t)(u).bits.manh; \
|
|
} while(0)
|