[deliverable/linux.git] / arch / mips / math-emu / ieee754.h

/*
 * 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

/* rounding mode
*/
#define IEEE754_RN	0	/* round to nearest */
#define IEEE754_RZ	1	/* round toward zero  */
#define IEEE754_RD	2	/* round toward -Infinity */
#define IEEE754_RU	3	/* round toward +Infinity */

/* other naming */
#define IEEE754_RM	IEEE754_RD
#define IEEE754_RP	IEEE754_RU

/* "normal" comparisons
*/
static inline int ieee754sp_eq(union ieee754sp x, union ieee754sp y)
{
	return ieee754sp_cmp(x, y, IEEE754_CEQ, 0);
}

static inline int ieee754sp_ne(union ieee754sp x, union ieee754sp y)
{
	return ieee754sp_cmp(x, y,
			     IEEE754_CLT | IEEE754_CGT | IEEE754_CUN, 0);
}

static inline int ieee754sp_lt(union ieee754sp x, union ieee754sp y)
{
	return ieee754sp_cmp(x, y, IEEE754_CLT, 0);
}

static inline int ieee754sp_le(union ieee754sp x, union ieee754sp y)
{
	return ieee754sp_cmp(x, y, IEEE754_CLT | IEEE754_CEQ, 0);
}

static inline int ieee754sp_gt(union ieee754sp x, union ieee754sp y)
{
	return ieee754sp_cmp(x, y, IEEE754_CGT, 0);
}


static inline int ieee754sp_ge(union ieee754sp x, union ieee754sp y)
{
	return ieee754sp_cmp(x, y, IEEE754_CGT | IEEE754_CEQ, 0);
}

static inline int ieee754dp_eq(union ieee754dp x, union ieee754dp y)
{
	return ieee754dp_cmp(x, y, IEEE754_CEQ, 0);
}

static inline int ieee754dp_ne(union ieee754dp x, union ieee754dp y)
{
	return ieee754dp_cmp(x, y,
			     IEEE754_CLT | IEEE754_CGT | IEEE754_CUN, 0);
}

static inline int ieee754dp_lt(union ieee754dp x, union ieee754dp y)
{
	return ieee754dp_cmp(x, y, IEEE754_CLT, 0);
}

static inline int ieee754dp_le(union ieee754dp x, union ieee754dp y)
{
	return ieee754dp_cmp(x, y, IEEE754_CLT | IEEE754_CEQ, 0);
}

static inline int ieee754dp_gt(union ieee754dp x, union ieee754dp y)
{
	return ieee754dp_cmp(x, y, IEEE754_CGT, 0);
}

static inline int ieee754dp_ge(union ieee754dp x, union ieee754dp y)
{
	return ieee754dp_cmp(x, y, IEEE754_CGT | IEEE754_CEQ, 0);
}

/*
 * The control status register
 */
struct _ieee754_csr {
	__BITFIELD_FIELD(unsigned pad0:7,
	__BITFIELD_FIELD(unsigned nod:1,	/* set 1 for no denormalised numbers */
	__BITFIELD_FIELD(unsigned c:1,		/* condition */
	__BITFIELD_FIELD(unsigned pad1:5,
	__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 *)(&current->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
#define IEEE754_SPCVAL_NZERO	1
#define IEEE754_SPCVAL_PONE	2
#define IEEE754_SPCVAL_NONE	3
#define IEEE754_SPCVAL_PTEN	4
#define IEEE754_SPCVAL_NTEN	5
#define IEEE754_SPCVAL_PINFINITY	6
#define IEEE754_SPCVAL_NINFINITY	7
#define IEEE754_SPCVAL_INDEF	8
#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 */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* MIPS floating point support
	3	* Copyright (C) 1994-2000 Algorithmics Ltd.
1da177e4	4	*
1da177e4 LT	5	* This program is free software; you can distribute it and/or modify it
	6	* under the terms of the GNU General Public License (Version 2) as
	7	* published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope it will be useful, but WITHOUT
	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	12	* for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License along
	15	* with this program; if not, write to the Free Software Foundation, Inc.,
3f7cac41	16	* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1da177e4	17	*
1da177e4 LT	18	* Nov 7, 2000
	19	* Modification to allow integration with Linux kernel
	20	*
	21	* Kevin D. Kissell, kevink@mips.com and Carsten Langgard, carstenl@mips.com
	22	* Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
cd21dfcf	23	*/
a663bf90 RB	24	#ifndef __ARCH_MIPS_MATH_EMU_IEEE754_H
a663bf90 RB	25	#define __ARCH_MIPS_MATH_EMU_IEEE754_H
1da177e4	26
cae55066	27	#include <linux/compiler.h>
cd21dfcf	28	#include <asm/byteorder.h>
e812a739	29	#include <linux/kernel.h>
1da177e4	30	#include <linux/types.h>
cd21dfcf	31	#include <linux/sched.h>
f80cc08d	32	#include <asm/bitfield.h>
1da177e4	33
2209bcb1	34	union ieee754dp {
1da177e4	35	struct {
f80cc08d RB	36	__BITFIELD_FIELD(unsigned int sign:1,
	37	__BITFIELD_FIELD(unsigned int bexp:11,
	38	__BITFIELD_FIELD(u64 mant:52,
	39	;)))
49548b09	40	};
1da177e4	41	u64 bits;
2209bcb1	42	};
1da177e4	43
2209bcb1	44	union ieee754sp {
49548b09 RB	45	struct {
	46	__BITFIELD_FIELD(unsigned sign:1,
	47	__BITFIELD_FIELD(unsigned bexp:8,
	48	__BITFIELD_FIELD(unsigned mant:23,
	49	;)))
	50	};
1da177e4	51	u32 bits;
2209bcb1	52	};
1da177e4 LT	53
	54	/*
	55	* single precision (often aka float)
	56	*/
2209bcb1	57	int ieee754sp_class(union ieee754sp x);
1da177e4	58
2209bcb1 RB	59	union ieee754sp ieee754sp_abs(union ieee754sp x);
2209bcb1 RB	60	union ieee754sp ieee754sp_neg(union ieee754sp x);
1da177e4	61
2209bcb1 RB	62	union ieee754sp ieee754sp_add(union ieee754sp x, union ieee754sp y);
	63	union ieee754sp ieee754sp_sub(union ieee754sp x, union ieee754sp y);
	64	union ieee754sp ieee754sp_mul(union ieee754sp x, union ieee754sp y);
	65	union ieee754sp ieee754sp_div(union ieee754sp x, union ieee754sp y);
1da177e4	66
2209bcb1	67	union ieee754sp ieee754sp_fint(int x);
2209bcb1	68	union ieee754sp ieee754sp_flong(s64 x);
2209bcb1	69	union ieee754sp ieee754sp_fdp(union ieee754dp x);
1da177e4	70
2209bcb1	71	int ieee754sp_tint(union ieee754sp x);
2209bcb1	72	s64 ieee754sp_tlong(union ieee754sp x);
1da177e4	73
2209bcb1	74	int ieee754sp_cmp(union ieee754sp x, union ieee754sp y, int cop, int sig);
1da177e4	75
2209bcb1	76	union ieee754sp ieee754sp_sqrt(union ieee754sp x);
1da177e4 LT	77
	78	/*
	79	* double precision (often aka double)
	80	*/
2209bcb1	81	int ieee754dp_class(union ieee754dp x);
1da177e4	82
2209bcb1 RB	83	union ieee754dp ieee754dp_add(union ieee754dp x, union ieee754dp y);
	84	union ieee754dp ieee754dp_sub(union ieee754dp x, union ieee754dp y);
	85	union ieee754dp ieee754dp_mul(union ieee754dp x, union ieee754dp y);
	86	union ieee754dp ieee754dp_div(union ieee754dp x, union ieee754dp y);
1da177e4	87
2209bcb1 RB	88	union ieee754dp ieee754dp_abs(union ieee754dp x);
2209bcb1 RB	89	union ieee754dp ieee754dp_neg(union ieee754dp x);
1da177e4	90
2209bcb1	91	union ieee754dp ieee754dp_fint(int x);
2209bcb1	92	union ieee754dp ieee754dp_flong(s64 x);
2209bcb1	93	union ieee754dp ieee754dp_fsp(union ieee754sp x);
1da177e4	94
2209bcb1	95	int ieee754dp_tint(union ieee754dp x);
2209bcb1	96	s64 ieee754dp_tlong(union ieee754dp x);
1da177e4	97
2209bcb1	98	int ieee754dp_cmp(union ieee754dp x, union ieee754dp y, int cop, int sig);
1da177e4	99
2209bcb1	100	union ieee754dp ieee754dp_sqrt(union ieee754dp x);
1da177e4 LT	101
	102
	103
	104	/* 5 types of floating point number
	105	*/
9e8bad1f RB	106	enum {
	107	IEEE754_CLASS_NORM = 0x00,
	108	IEEE754_CLASS_ZERO = 0x01,
	109	IEEE754_CLASS_DNORM = 0x02,
	110	IEEE754_CLASS_INF = 0x03,
	111	IEEE754_CLASS_SNAN = 0x04,
	112	IEEE754_CLASS_QNAN = 0x05,
	113	};
1da177e4 LT	114
	115	/* exception numbers */
	116	#define IEEE754_INEXACT 0x01
	117	#define IEEE754_UNDERFLOW 0x02
	118	#define IEEE754_OVERFLOW 0x04
	119	#define IEEE754_ZERO_DIVIDE 0x08
	120	#define IEEE754_INVALID_OPERATION 0x10
	121
	122	/* cmp operators
	123	*/
	124	#define IEEE754_CLT 0x01
	125	#define IEEE754_CEQ 0x02
	126	#define IEEE754_CGT 0x04
	127	#define IEEE754_CUN 0x08
	128
	129	/* rounding mode
	130	*/
	131	#define IEEE754_RN 0 /* round to nearest */
	132	#define IEEE754_RZ 1 /* round toward zero */
	133	#define IEEE754_RD 2 /* round toward -Infinity */
	134	#define IEEE754_RU 3 /* round toward +Infinity */
	135
	136	/* other naming */
	137	#define IEEE754_RM IEEE754_RD
	138	#define IEEE754_RP IEEE754_RU
	139
	140	/* "normal" comparisons
	141	*/
2209bcb1	142	static inline int ieee754sp_eq(union ieee754sp x, union ieee754sp y)
1da177e4 LT	143	{
	144	return ieee754sp_cmp(x, y, IEEE754_CEQ, 0);
	145	}
	146
2209bcb1	147	static inline int ieee754sp_ne(union ieee754sp x, union ieee754sp y)
1da177e4 LT	148	{
	149	return ieee754sp_cmp(x, y,
	150	IEEE754_CLT \| IEEE754_CGT \| IEEE754_CUN, 0);
	151	}
	152
2209bcb1	153	static inline int ieee754sp_lt(union ieee754sp x, union ieee754sp y)
1da177e4 LT	154	{
	155	return ieee754sp_cmp(x, y, IEEE754_CLT, 0);
	156	}
	157
2209bcb1	158	static inline int ieee754sp_le(union ieee754sp x, union ieee754sp y)
1da177e4 LT	159	{
	160	return ieee754sp_cmp(x, y, IEEE754_CLT \| IEEE754_CEQ, 0);
	161	}
	162
2209bcb1	163	static inline int ieee754sp_gt(union ieee754sp x, union ieee754sp y)
1da177e4 LT	164	{
	165	return ieee754sp_cmp(x, y, IEEE754_CGT, 0);
	166	}
	167
	168
2209bcb1	169	static inline int ieee754sp_ge(union ieee754sp x, union ieee754sp y)
1da177e4 LT	170	{
	171	return ieee754sp_cmp(x, y, IEEE754_CGT \| IEEE754_CEQ, 0);
	172	}
	173
2209bcb1	174	static inline int ieee754dp_eq(union ieee754dp x, union ieee754dp y)
1da177e4 LT	175	{
	176	return ieee754dp_cmp(x, y, IEEE754_CEQ, 0);
	177	}
	178
2209bcb1	179	static inline int ieee754dp_ne(union ieee754dp x, union ieee754dp y)
1da177e4 LT	180	{
	181	return ieee754dp_cmp(x, y,
	182	IEEE754_CLT \| IEEE754_CGT \| IEEE754_CUN, 0);
	183	}
	184
2209bcb1	185	static inline int ieee754dp_lt(union ieee754dp x, union ieee754dp y)
1da177e4 LT	186	{
	187	return ieee754dp_cmp(x, y, IEEE754_CLT, 0);
	188	}
	189
2209bcb1	190	static inline int ieee754dp_le(union ieee754dp x, union ieee754dp y)
1da177e4 LT	191	{
	192	return ieee754dp_cmp(x, y, IEEE754_CLT \| IEEE754_CEQ, 0);
	193	}
	194
2209bcb1	195	static inline int ieee754dp_gt(union ieee754dp x, union ieee754dp y)
1da177e4 LT	196	{
	197	return ieee754dp_cmp(x, y, IEEE754_CGT, 0);
	198	}
	199
2209bcb1	200	static inline int ieee754dp_ge(union ieee754dp x, union ieee754dp y)
1da177e4 LT	201	{
	202	return ieee754dp_cmp(x, y, IEEE754_CGT \| IEEE754_CEQ, 0);
	203	}
	204
cd21dfcf RB	205	/*
	206	* The control status register
	207	*/
	208	struct _ieee754_csr {
f80cc08d RB	209	__BITFIELD_FIELD(unsigned pad0:7,
	210	__BITFIELD_FIELD(unsigned nod:1, /* set 1 for no denormalised numbers */
	211	__BITFIELD_FIELD(unsigned c:1, /* condition */
	212	__BITFIELD_FIELD(unsigned pad1:5,
	213	__BITFIELD_FIELD(unsigned cx:6, /* exceptions this operation */
	214	__BITFIELD_FIELD(unsigned mx:5, /* exception enable mask */
	215	__BITFIELD_FIELD(unsigned sx:5, /* exceptions total */
	216	__BITFIELD_FIELD(unsigned rm:2, /* current rounding mode */
	217	;))))))))
1da177e4	218	};
eae89076	219	#define ieee754_csr ((struct _ieee754_csr )(&current->thread.fpu.fcr31))
1da177e4	220
cd21dfcf	221	static inline unsigned ieee754_getrm(void)
1da177e4 LT	222	{
	223	return (ieee754_csr.rm);
	224	}
cd21dfcf	225	static inline unsigned ieee754_setrm(unsigned rm)
1da177e4 LT	226	{
	227	return (ieee754_csr.rm = rm);
	228	}
	229
	230	/*
	231	* get current exceptions
	232	*/
cd21dfcf	233	static inline unsigned ieee754_getcx(void)
1da177e4 LT	234	{
	235	return (ieee754_csr.cx);
	236	}
	237
	238	/* test for current exception condition
	239	*/
cd21dfcf	240	static inline int ieee754_cxtest(unsigned n)
1da177e4 LT	241	{
	242	return (ieee754_csr.cx & n);
	243	}
	244
	245	/*
	246	* get sticky exceptions
	247	*/
cd21dfcf	248	static inline unsigned ieee754_getsx(void)
1da177e4 LT	249	{
	250	return (ieee754_csr.sx);
	251	}
	252
	253	/* clear sticky conditions
	254	*/
cd21dfcf	255	static inline unsigned ieee754_clrsx(void)
1da177e4 LT	256	{
	257	return (ieee754_csr.sx = 0);
	258	}
	259
	260	/* test for sticky exception condition
	261	*/
cd21dfcf	262	static inline int ieee754_sxtest(unsigned n)
1da177e4 LT	263	{
	264	return (ieee754_csr.sx & n);
	265	}
	266
	267	/* debugging */
2209bcb1 RB	268	union ieee754sp ieee754sp_dump(char *s, union ieee754sp x);
2209bcb1 RB	269	union ieee754dp ieee754dp_dump(char *s, union ieee754dp x);
1da177e4 LT	270
	271	#define IEEE754_SPCVAL_PZERO 0
	272	#define IEEE754_SPCVAL_NZERO 1
	273	#define IEEE754_SPCVAL_PONE 2
	274	#define IEEE754_SPCVAL_NONE 3
	275	#define IEEE754_SPCVAL_PTEN 4
	276	#define IEEE754_SPCVAL_NTEN 5
	277	#define IEEE754_SPCVAL_PINFINITY 6
	278	#define IEEE754_SPCVAL_NINFINITY 7
	279	#define IEEE754_SPCVAL_INDEF 8
	280	#define IEEE754_SPCVAL_PMAX 9 /* +max norm */
	281	#define IEEE754_SPCVAL_NMAX 10 /* -max norm */
	282	#define IEEE754_SPCVAL_PMIN 11 /* +min norm */
	283	#define IEEE754_SPCVAL_NMIN 12 /* +min norm */
	284	#define IEEE754_SPCVAL_PMIND 13 /* +min denorm */
	285	#define IEEE754_SPCVAL_NMIND 14 /* +min denorm */
	286	#define IEEE754_SPCVAL_P1E31 15 /* + 1.0e31 */
	287	#define IEEE754_SPCVAL_P1E63 16 /* + 1.0e63 */
	288
49548b09 RB	289	extern const union ieee754dp __ieee754dp_spcvals[];
49548b09 RB	290	extern const union ieee754sp __ieee754sp_spcvals[];
2209bcb1 RB	291	#define ieee754dp_spcvals ((const union ieee754dp *)__ieee754dp_spcvals)
2209bcb1 RB	292	#define ieee754sp_spcvals ((const union ieee754sp *)__ieee754sp_spcvals)
1da177e4	293
cd21dfcf RB	294	/*
	295	* Return infinity with given sign
	296	*/
	297	#define ieee754dp_inf(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
	298	#define ieee754dp_zero(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
	299	#define ieee754dp_one(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
	300	#define ieee754dp_ten(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
	301	#define ieee754dp_indef() (ieee754dp_spcvals[IEEE754_SPCVAL_INDEF])
	302	#define ieee754dp_max(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
	303	#define ieee754dp_min(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
	304	#define ieee754dp_mind(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
	305	#define ieee754dp_1e31() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E31])
	306	#define ieee754dp_1e63() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E63])
	307
	308	#define ieee754sp_inf(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
	309	#define ieee754sp_zero(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
	310	#define ieee754sp_one(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
	311	#define ieee754sp_ten(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
	312	#define ieee754sp_indef() (ieee754sp_spcvals[IEEE754_SPCVAL_INDEF])
	313	#define ieee754sp_max(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
	314	#define ieee754sp_min(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
	315	#define ieee754sp_mind(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
	316	#define ieee754sp_1e31() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E31])
	317	#define ieee754sp_1e63() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E63])
	318
	319	/*
	320	* Indefinite integer value
	321	*/
e812a739 RB	322	static inline int ieee754si_indef(void)
	323	{
	324	return INT_MAX;
	325	}
	326
	327	static inline s64 ieee754di_indef(void)
	328	{
	329	return S64_MAX;
	330	}
1da177e4	331
1da177e4 LT	332	/* result types for xctx.rt */
	333	#define IEEE754_RT_SP 0
	334	#define IEEE754_RT_DP 1
	335	#define IEEE754_RT_XP 2
	336	#define IEEE754_RT_SI 3
	337	#define IEEE754_RT_DI 4
	338
1da177e4 LT	339	/* compat */
	340	#define ieee754dp_fix(x) ieee754dp_tint(x)
	341	#define ieee754sp_fix(x) ieee754sp_tint(x)
a663bf90 RB	342
a663bf90 RB	343	#endif /* __ARCH_MIPS_MATH_EMU_IEEE754_H */