bbfbc439f2
When the RISC-V port was initially committed to FreeBSD, GCC would
generate 64-bit long doubles, and the definitions in _fpmath.h reflected
that. This was changed to 128-bit in GCC later that year [1], but the
definitions were never updated, despite the documented workaround. This
causes printf(3) and friends to interpret only the low 64-bits of a long
double in ldtoa, thereby printing incorrect values.
Update the definitions now that both clang and GCC generate 128-bit long
doubles.
[1] 54b21fc5ae
PR: 242067
Reported by: Dennis Clarke <dclarke@blastwave.org>
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D25420
58 lines
2.0 KiB
C
58 lines
2.0 KiB
C
/*-
|
|
* Copyright (c) 2002, 2003 David Schultz <das@FreeBSD.ORG>
|
|
* Copyright (c) 2014 The FreeBSD Foundation
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
union IEEEl2bits {
|
|
long double e;
|
|
struct {
|
|
unsigned long manl :64;
|
|
unsigned long manh :48;
|
|
unsigned int exp :15;
|
|
unsigned int sign :1;
|
|
} bits;
|
|
struct {
|
|
unsigned long manl :64;
|
|
unsigned long manh :48;
|
|
unsigned int expsign :16;
|
|
} xbits;
|
|
};
|
|
|
|
#define LDBL_NBIT 0
|
|
#define LDBL_IMPLICIT_NBIT
|
|
#define mask_nbit_l(u) ((void)0)
|
|
|
|
#define LDBL_MANH_SIZE 48
|
|
#define LDBL_MANL_SIZE 64
|
|
|
|
#define LDBL_TO_ARRAY32(u, a) do { \
|
|
(a)[0] = (uint32_t)(u).bits.manl; \
|
|
(a)[1] = (uint32_t)((u).bits.manl >> 32); \
|
|
(a)[2] = (uint32_t)(u).bits.manh; \
|
|
(a)[3] = (uint32_t)((u).bits.manh >> 32); \
|
|
} while(0)
|