83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
/*
|
|
* IEEE754 floating point
|
|
* double precision internal header file
|
|
*/
|
|
/*
|
|
* MIPS floating point support
|
|
* Copyright (C) 1994-2000 Algorithmics Ltd.
|
|
*
|
|
* This program is free software; you can distribute it and/or modify it
|
|
* under the terms of the GNU General Public License (Version 2) as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
* for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include <linux/compiler.h>
|
|
|
|
#include "ieee754int.h"
|
|
|
|
#define assert(expr) ((void)0)
|
|
|
|
#define DP_EBIAS 1023
|
|
#define DP_EMIN (-1022)
|
|
#define DP_EMAX 1023
|
|
#define DP_FBITS 52
|
|
#define DP_MBITS 52
|
|
|
|
#define DP_MBIT(x) ((u64)1 << (x))
|
|
#define DP_HIDDEN_BIT DP_MBIT(DP_FBITS)
|
|
#define DP_SIGN_BIT DP_MBIT(63)
|
|
|
|
#define DPSIGN(dp) (dp.sign)
|
|
#define DPBEXP(dp) (dp.bexp)
|
|
#define DPMANT(dp) (dp.mant)
|
|
|
|
static inline int ieee754dp_finite(union ieee754dp x)
|
|
{
|
|
return DPBEXP(x) != DP_EMAX + 1 + DP_EBIAS;
|
|
}
|
|
|
|
/* 3bit extended double precision sticky right shift */
|
|
#define XDPSRS(v,rs) \
|
|
((rs > (DP_FBITS+3))?1:((v) >> (rs)) | ((v) << (64-(rs)) != 0))
|
|
|
|
#define XDPSRSX1() \
|
|
(xe++, (xm = (xm >> 1) | (xm & 1)))
|
|
|
|
#define XDPSRS1(v) \
|
|
(((v) >> 1) | ((v) & 1))
|
|
|
|
/* convert denormal to normalized with extended exponent */
|
|
#define DPDNORMx(m,e) \
|
|
while ((m >> DP_FBITS) == 0) { m <<= 1; e--; }
|
|
#define DPDNORMX DPDNORMx(xm, xe)
|
|
#define DPDNORMY DPDNORMx(ym, ye)
|
|
|
|
static inline union ieee754dp builddp(int s, int bx, u64 m)
|
|
{
|
|
union ieee754dp r;
|
|
|
|
assert((s) == 0 || (s) == 1);
|
|
assert((bx) >= DP_EMIN - 1 + DP_EBIAS
|
|
&& (bx) <= DP_EMAX + 1 + DP_EBIAS);
|
|
assert(((m) >> DP_FBITS) == 0);
|
|
|
|
r.sign = s;
|
|
r.bexp = bx;
|
|
r.mant = m;
|
|
|
|
return r;
|
|
}
|
|
|
|
extern int ieee754dp_isnan(union ieee754dp);
|
|
extern union ieee754dp __cold ieee754dp_nanxcpt(union ieee754dp);
|
|
extern union ieee754dp ieee754dp_format(int, int, u64);
|