270 lines
8.1 KiB
C
270 lines
8.1 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* Nov 7, 2000
|
|
* Modification to allow integration with Linux kernel
|
|
*
|
|
* Kevin D. Kissell, kevink@mips.com and Carsten Langgard, carstenl@mips.com
|
|
* Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
|
|
*/
|
|
#ifndef __ARCH_MIPS_MATH_EMU_IEEE754_H
|
|
#define __ARCH_MIPS_MATH_EMU_IEEE754_H
|
|
|
|
#include <linux/compiler.h>
|
|
#include <asm/byteorder.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/types.h>
|
|
#include <linux/sched.h>
|
|
#include <asm/bitfield.h>
|
|
|
|
union ieee754dp {
|
|
struct {
|
|
__BITFIELD_FIELD(unsigned int sign:1,
|
|
__BITFIELD_FIELD(unsigned int bexp:11,
|
|
__BITFIELD_FIELD(u64 mant:52,
|
|
;)))
|
|
};
|
|
u64 bits;
|
|
};
|
|
|
|
union ieee754sp {
|
|
struct {
|
|
__BITFIELD_FIELD(unsigned sign:1,
|
|
__BITFIELD_FIELD(unsigned bexp:8,
|
|
__BITFIELD_FIELD(unsigned mant:23,
|
|
;)))
|
|
};
|
|
u32 bits;
|
|
};
|
|
|
|
/*
|
|
* single precision (often aka float)
|
|
*/
|
|
int ieee754sp_class(union ieee754sp x);
|
|
|
|
union ieee754sp ieee754sp_abs(union ieee754sp x);
|
|
union ieee754sp ieee754sp_neg(union ieee754sp x);
|
|
|
|
union ieee754sp ieee754sp_add(union ieee754sp x, union ieee754sp y);
|
|
union ieee754sp ieee754sp_sub(union ieee754sp x, union ieee754sp y);
|
|
union ieee754sp ieee754sp_mul(union ieee754sp x, union ieee754sp y);
|
|
union ieee754sp ieee754sp_div(union ieee754sp x, union ieee754sp y);
|
|
|
|
union ieee754sp ieee754sp_fint(int x);
|
|
union ieee754sp ieee754sp_flong(s64 x);
|
|
union ieee754sp ieee754sp_fdp(union ieee754dp x);
|
|
|
|
int ieee754sp_tint(union ieee754sp x);
|
|
s64 ieee754sp_tlong(union ieee754sp x);
|
|
|
|
int ieee754sp_cmp(union ieee754sp x, union ieee754sp y, int cop, int sig);
|
|
|
|
union ieee754sp ieee754sp_sqrt(union ieee754sp x);
|
|
|
|
/*
|
|
* double precision (often aka double)
|
|
*/
|
|
int ieee754dp_class(union ieee754dp x);
|
|
|
|
union ieee754dp ieee754dp_add(union ieee754dp x, union ieee754dp y);
|
|
union ieee754dp ieee754dp_sub(union ieee754dp x, union ieee754dp y);
|
|
union ieee754dp ieee754dp_mul(union ieee754dp x, union ieee754dp y);
|
|
union ieee754dp ieee754dp_div(union ieee754dp x, union ieee754dp y);
|
|
|
|
union ieee754dp ieee754dp_abs(union ieee754dp x);
|
|
union ieee754dp ieee754dp_neg(union ieee754dp x);
|
|
|
|
union ieee754dp ieee754dp_fint(int x);
|
|
union ieee754dp ieee754dp_flong(s64 x);
|
|
union ieee754dp ieee754dp_fsp(union ieee754sp x);
|
|
|
|
int ieee754dp_tint(union ieee754dp x);
|
|
s64 ieee754dp_tlong(union ieee754dp x);
|
|
|
|
int ieee754dp_cmp(union ieee754dp x, union ieee754dp y, int cop, int sig);
|
|
|
|
union ieee754dp ieee754dp_sqrt(union ieee754dp x);
|
|
|
|
|
|
|
|
/* 5 types of floating point number
|
|
*/
|
|
enum {
|
|
IEEE754_CLASS_NORM = 0x00,
|
|
IEEE754_CLASS_ZERO = 0x01,
|
|
IEEE754_CLASS_DNORM = 0x02,
|
|
IEEE754_CLASS_INF = 0x03,
|
|
IEEE754_CLASS_SNAN = 0x04,
|
|
IEEE754_CLASS_QNAN = 0x05,
|
|
};
|
|
|
|
/* exception numbers */
|
|
#define IEEE754_INEXACT 0x01
|
|
#define IEEE754_UNDERFLOW 0x02
|
|
#define IEEE754_OVERFLOW 0x04
|
|
#define IEEE754_ZERO_DIVIDE 0x08
|
|
#define IEEE754_INVALID_OPERATION 0x10
|
|
|
|
/* cmp operators
|
|
*/
|
|
#define IEEE754_CLT 0x01
|
|
#define IEEE754_CEQ 0x02
|
|
#define IEEE754_CGT 0x04
|
|
#define IEEE754_CUN 0x08
|
|
|
|
/*
|
|
* The control status register
|
|
*/
|
|
struct _ieee754_csr {
|
|
__BITFIELD_FIELD(unsigned fcc:7, /* condition[7:1] */
|
|
__BITFIELD_FIELD(unsigned nod:1, /* set 1 for no denormals */
|
|
__BITFIELD_FIELD(unsigned c:1, /* condition[0] */
|
|
__BITFIELD_FIELD(unsigned pad0:3,
|
|
__BITFIELD_FIELD(unsigned abs2008:1, /* IEEE 754-2008 ABS/NEG.fmt */
|
|
__BITFIELD_FIELD(unsigned nan2008:1, /* IEEE 754-2008 NaN mode */
|
|
__BITFIELD_FIELD(unsigned cx:6, /* exceptions this operation */
|
|
__BITFIELD_FIELD(unsigned mx:5, /* exception enable mask */
|
|
__BITFIELD_FIELD(unsigned sx:5, /* exceptions total */
|
|
__BITFIELD_FIELD(unsigned rm:2, /* current rounding mode */
|
|
;))))))))))
|
|
};
|
|
#define ieee754_csr (*(struct _ieee754_csr *)(¤t->thread.fpu.fcr31))
|
|
|
|
static inline unsigned ieee754_getrm(void)
|
|
{
|
|
return (ieee754_csr.rm);
|
|
}
|
|
static inline unsigned ieee754_setrm(unsigned rm)
|
|
{
|
|
return (ieee754_csr.rm = rm);
|
|
}
|
|
|
|
/*
|
|
* get current exceptions
|
|
*/
|
|
static inline unsigned ieee754_getcx(void)
|
|
{
|
|
return (ieee754_csr.cx);
|
|
}
|
|
|
|
/* test for current exception condition
|
|
*/
|
|
static inline int ieee754_cxtest(unsigned n)
|
|
{
|
|
return (ieee754_csr.cx & n);
|
|
}
|
|
|
|
/*
|
|
* get sticky exceptions
|
|
*/
|
|
static inline unsigned ieee754_getsx(void)
|
|
{
|
|
return (ieee754_csr.sx);
|
|
}
|
|
|
|
/* clear sticky conditions
|
|
*/
|
|
static inline unsigned ieee754_clrsx(void)
|
|
{
|
|
return (ieee754_csr.sx = 0);
|
|
}
|
|
|
|
/* test for sticky exception condition
|
|
*/
|
|
static inline int ieee754_sxtest(unsigned n)
|
|
{
|
|
return (ieee754_csr.sx & n);
|
|
}
|
|
|
|
/* debugging */
|
|
union ieee754sp ieee754sp_dump(char *s, union ieee754sp x);
|
|
union ieee754dp ieee754dp_dump(char *s, union ieee754dp x);
|
|
|
|
#define IEEE754_SPCVAL_PZERO 0 /* +0.0 */
|
|
#define IEEE754_SPCVAL_NZERO 1 /* -0.0 */
|
|
#define IEEE754_SPCVAL_PONE 2 /* +1.0 */
|
|
#define IEEE754_SPCVAL_NONE 3 /* -1.0 */
|
|
#define IEEE754_SPCVAL_PTEN 4 /* +10.0 */
|
|
#define IEEE754_SPCVAL_NTEN 5 /* -10.0 */
|
|
#define IEEE754_SPCVAL_PINFINITY 6 /* +inf */
|
|
#define IEEE754_SPCVAL_NINFINITY 7 /* -inf */
|
|
#define IEEE754_SPCVAL_INDEF 8 /* quiet NaN */
|
|
#define IEEE754_SPCVAL_PMAX 9 /* +max norm */
|
|
#define IEEE754_SPCVAL_NMAX 10 /* -max norm */
|
|
#define IEEE754_SPCVAL_PMIN 11 /* +min norm */
|
|
#define IEEE754_SPCVAL_NMIN 12 /* -min norm */
|
|
#define IEEE754_SPCVAL_PMIND 13 /* +min denorm */
|
|
#define IEEE754_SPCVAL_NMIND 14 /* -min denorm */
|
|
#define IEEE754_SPCVAL_P1E31 15 /* + 1.0e31 */
|
|
#define IEEE754_SPCVAL_P1E63 16 /* + 1.0e63 */
|
|
|
|
extern const union ieee754dp __ieee754dp_spcvals[];
|
|
extern const union ieee754sp __ieee754sp_spcvals[];
|
|
#define ieee754dp_spcvals ((const union ieee754dp *)__ieee754dp_spcvals)
|
|
#define ieee754sp_spcvals ((const union ieee754sp *)__ieee754sp_spcvals)
|
|
|
|
/*
|
|
* Return infinity with given sign
|
|
*/
|
|
#define ieee754dp_inf(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
|
|
#define ieee754dp_zero(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
|
|
#define ieee754dp_one(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
|
|
#define ieee754dp_ten(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
|
|
#define ieee754dp_indef() (ieee754dp_spcvals[IEEE754_SPCVAL_INDEF])
|
|
#define ieee754dp_max(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
|
|
#define ieee754dp_min(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
|
|
#define ieee754dp_mind(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
|
|
#define ieee754dp_1e31() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E31])
|
|
#define ieee754dp_1e63() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E63])
|
|
|
|
#define ieee754sp_inf(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
|
|
#define ieee754sp_zero(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
|
|
#define ieee754sp_one(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
|
|
#define ieee754sp_ten(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
|
|
#define ieee754sp_indef() (ieee754sp_spcvals[IEEE754_SPCVAL_INDEF])
|
|
#define ieee754sp_max(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
|
|
#define ieee754sp_min(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
|
|
#define ieee754sp_mind(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
|
|
#define ieee754sp_1e31() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E31])
|
|
#define ieee754sp_1e63() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E63])
|
|
|
|
/*
|
|
* Indefinite integer value
|
|
*/
|
|
static inline int ieee754si_indef(void)
|
|
{
|
|
return INT_MAX;
|
|
}
|
|
|
|
static inline s64 ieee754di_indef(void)
|
|
{
|
|
return S64_MAX;
|
|
}
|
|
|
|
/* result types for xctx.rt */
|
|
#define IEEE754_RT_SP 0
|
|
#define IEEE754_RT_DP 1
|
|
#define IEEE754_RT_XP 2
|
|
#define IEEE754_RT_SI 3
|
|
#define IEEE754_RT_DI 4
|
|
|
|
/* compat */
|
|
#define ieee754dp_fix(x) ieee754dp_tint(x)
|
|
#define ieee754sp_fix(x) ieee754sp_tint(x)
|
|
|
|
#endif /* __ARCH_MIPS_MATH_EMU_IEEE754_H */
|