[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.,
 *  59 Temple Place - Suite 330, Boston MA 02111-1307, 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 <asm/byteorder.h>
#include <linux/types.h>
#include <linux/sched.h>

/*
 * Not very pretty, but the Linux kernel's normal va_list definition
 * does not allow it to be used as a structure element, as it is here.
 */
#ifndef _STDARG_H
#include <stdarg.h>
#endif

#ifdef __LITTLE_ENDIAN
struct ieee754dp_konst {
	unsigned mantlo:32;
	unsigned manthi:20;
	unsigned bexp:11;
	unsigned sign:1;
};
struct ieee754sp_konst {
	unsigned mant:23;
	unsigned bexp:8;
	unsigned sign:1;
};

typedef union _ieee754dp {
	struct ieee754dp_konst oparts;
	struct {
		u64 mant:52;
		unsigned int bexp:11;
		unsigned int sign:1;
	} parts;
	u64 bits;
	double d;
} ieee754dp;

typedef union _ieee754sp {
	struct ieee754sp_konst parts;
	float f;
	u32 bits;
} ieee754sp;
#endif

#ifdef __BIG_ENDIAN
struct ieee754dp_konst {
	unsigned sign:1;
	unsigned bexp:11;
	unsigned manthi:20;
	unsigned mantlo:32;
};

typedef union _ieee754dp {
	struct ieee754dp_konst oparts;
	struct {
		unsigned int sign:1;
		unsigned int bexp:11;
		u64 mant:52;
	} parts;
	double d;
	u64 bits;
} ieee754dp;

struct ieee754sp_konst {
	unsigned sign:1;
	unsigned bexp:8;
	unsigned mant:23;
};

typedef union _ieee754sp {
	struct ieee754sp_konst parts;
	float f;
	u32 bits;
} ieee754sp;
#endif

/*
 * single precision (often aka float)
*/
int ieee754sp_finite(ieee754sp x);
int ieee754sp_class(ieee754sp x);

ieee754sp ieee754sp_abs(ieee754sp x);
ieee754sp ieee754sp_neg(ieee754sp x);
ieee754sp ieee754sp_scalb(ieee754sp x, int);
ieee754sp ieee754sp_logb(ieee754sp x);

/* x with sign of y */
ieee754sp ieee754sp_copysign(ieee754sp x, ieee754sp y);

ieee754sp ieee754sp_add(ieee754sp x, ieee754sp y);
ieee754sp ieee754sp_sub(ieee754sp x, ieee754sp y);
ieee754sp ieee754sp_mul(ieee754sp x, ieee754sp y);
ieee754sp ieee754sp_div(ieee754sp x, ieee754sp y);

ieee754sp ieee754sp_fint(int x);
ieee754sp ieee754sp_funs(unsigned x);
ieee754sp ieee754sp_flong(s64 x);
ieee754sp ieee754sp_fulong(u64 x);
ieee754sp ieee754sp_fdp(ieee754dp x);

int ieee754sp_tint(ieee754sp x);
unsigned int ieee754sp_tuns(ieee754sp x);
s64 ieee754sp_tlong(ieee754sp x);
u64 ieee754sp_tulong(ieee754sp x);

int ieee754sp_cmp(ieee754sp x, ieee754sp y, int cop, int sig);
/*
 * basic sp math
 */
ieee754sp ieee754sp_modf(ieee754sp x, ieee754sp * ip);
ieee754sp ieee754sp_frexp(ieee754sp x, int *exp);
ieee754sp ieee754sp_ldexp(ieee754sp x, int exp);

ieee754sp ieee754sp_ceil(ieee754sp x);
ieee754sp ieee754sp_floor(ieee754sp x);
ieee754sp ieee754sp_trunc(ieee754sp x);

ieee754sp ieee754sp_sqrt(ieee754sp x);

/*
 * double precision (often aka double)
*/
int ieee754dp_finite(ieee754dp x);
int ieee754dp_class(ieee754dp x);

/* x with sign of y */
ieee754dp ieee754dp_copysign(ieee754dp x, ieee754dp y);

ieee754dp ieee754dp_add(ieee754dp x, ieee754dp y);
ieee754dp ieee754dp_sub(ieee754dp x, ieee754dp y);
ieee754dp ieee754dp_mul(ieee754dp x, ieee754dp y);
ieee754dp ieee754dp_div(ieee754dp x, ieee754dp y);

ieee754dp ieee754dp_abs(ieee754dp x);
ieee754dp ieee754dp_neg(ieee754dp x);
ieee754dp ieee754dp_scalb(ieee754dp x, int);

/* return exponent as integer in floating point format
 */
ieee754dp ieee754dp_logb(ieee754dp x);

ieee754dp ieee754dp_fint(int x);
ieee754dp ieee754dp_funs(unsigned x);
ieee754dp ieee754dp_flong(s64 x);
ieee754dp ieee754dp_fulong(u64 x);
ieee754dp ieee754dp_fsp(ieee754sp x);

ieee754dp ieee754dp_ceil(ieee754dp x);
ieee754dp ieee754dp_floor(ieee754dp x);
ieee754dp ieee754dp_trunc(ieee754dp x);

int ieee754dp_tint(ieee754dp x);
unsigned int ieee754dp_tuns(ieee754dp x);
s64 ieee754dp_tlong(ieee754dp x);
u64 ieee754dp_tulong(ieee754dp x);

int ieee754dp_cmp(ieee754dp x, ieee754dp y, int cop, int sig);
/*
 * basic sp math
 */
ieee754dp ieee754dp_modf(ieee754dp x, ieee754dp * ip);
ieee754dp ieee754dp_frexp(ieee754dp x, int *exp);
ieee754dp ieee754dp_ldexp(ieee754dp x, int exp);

ieee754dp ieee754dp_ceil(ieee754dp x);
ieee754dp ieee754dp_floor(ieee754dp x);
ieee754dp ieee754dp_trunc(ieee754dp x);

ieee754dp ieee754dp_sqrt(ieee754dp x);


/* 5 types of floating point number
*/
#define IEEE754_CLASS_NORM	0x00
#define IEEE754_CLASS_ZERO	0x01
#define IEEE754_CLASS_DNORM	0x02
#define IEEE754_CLASS_INF	0x03
#define IEEE754_CLASS_SNAN	0x04
#define 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(ieee754sp x, ieee754sp y)
{
	return ieee754sp_cmp(x, y, IEEE754_CEQ, 0);
}

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

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

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

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


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

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

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

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

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

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

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


/*
 * Like strtod
 */
ieee754dp ieee754dp_fstr(const char *s, char **endp);
char *ieee754dp_tstr(ieee754dp x, int prec, int fmt, int af);


/*
 * The control status register
 */
struct _ieee754_csr {
#ifdef __BIG_ENDIAN
	unsigned pad0:7;
	unsigned nod:1;		/* set 1 for no denormalised numbers */
	unsigned c:1;		/* condition */
	unsigned pad1:5;
	unsigned cx:6;		/* exceptions this operation */
	unsigned mx:5;		/* exception enable  mask */
	unsigned sx:5;		/* exceptions total */
	unsigned rm:2;		/* current rounding mode */
#endif
#ifdef __LITTLE_ENDIAN
	unsigned rm:2;		/* current rounding mode */
	unsigned sx:5;		/* exceptions total */
	unsigned mx:5;		/* exception enable  mask */
	unsigned cx:6;		/* exceptions this operation */
	unsigned pad1:5;
	unsigned c:1;		/* condition */
	unsigned nod:1;		/* set 1 for no denormalised numbers */
	unsigned pad0:7;
#endif
};
#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 */
ieee754sp ieee754sp_dump(char *s, ieee754sp x);
ieee754dp ieee754dp_dump(char *s, 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 struct ieee754dp_konst __ieee754dp_spcvals[];
extern const struct ieee754sp_konst __ieee754sp_spcvals[];
#define ieee754dp_spcvals ((const ieee754dp *)__ieee754dp_spcvals)
#define ieee754sp_spcvals ((const 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
 */
#define ieee754si_indef()	INT_MAX
#ifdef LONG_LONG_MAX
#define ieee754di_indef()	LONG_LONG_MAX
#else
#define ieee754di_indef()	((s64)(~0ULL>>1))
#endif

/* IEEE exception context, passed to handler */
struct ieee754xctx {
	const char *op;		/* operation name */
	int rt;			/* result type */
	union {
		ieee754sp sp;	/* single precision */
		ieee754dp dp;	/* double precision */
#ifdef IEEE854_XP
		ieee754xp xp;	/* extended precision */
#endif
		int si;		/* standard signed integer (32bits) */
		s64 di;		/* extended signed integer (64bits) */
	} rv;			/* default result format implied by op */
	va_list ap;
};

/* 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

extern void ieee754_xcpt(struct ieee754xctx *xcp);

/* 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.,
	16	* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
	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
cd21dfcf	27	#include <asm/byteorder.h>
1da177e4	28	#include <linux/types.h>
cd21dfcf	29	#include <linux/sched.h>
1da177e4 LT	30
	31	/*
	32	* Not very pretty, but the Linux kernel's normal va_list definition
	33	* does not allow it to be used as a structure element, as it is here.
	34	*/
	35	#ifndef _STDARG_H
	36	#include <stdarg.h>
	37	#endif
	38
cd21dfcf	39	#ifdef __LITTLE_ENDIAN
1da177e4 LT	40	struct ieee754dp_konst {
	41	unsigned mantlo:32;
	42	unsigned manthi:20;
	43	unsigned bexp:11;
	44	unsigned sign:1;
	45	};
	46	struct ieee754sp_konst {
	47	unsigned mant:23;
	48	unsigned bexp:8;
	49	unsigned sign:1;
	50	};
	51
	52	typedef union _ieee754dp {
	53	struct ieee754dp_konst oparts;
	54	struct {
	55	u64 mant:52;
	56	unsigned int bexp:11;
	57	unsigned int sign:1;
	58	} parts;
	59	u64 bits;
	60	double d;
	61	} ieee754dp;
	62
	63	typedef union _ieee754sp {
	64	struct ieee754sp_konst parts;
	65	float f;
	66	u32 bits;
	67	} ieee754sp;
	68	#endif
	69
cd21dfcf	70	#ifdef __BIG_ENDIAN
1da177e4 LT	71	struct ieee754dp_konst {
	72	unsigned sign:1;
	73	unsigned bexp:11;
	74	unsigned manthi:20;
	75	unsigned mantlo:32;
	76	};
cd21dfcf	77
1da177e4 LT	78	typedef union _ieee754dp {
	79	struct ieee754dp_konst oparts;
	80	struct {
	81	unsigned int sign:1;
	82	unsigned int bexp:11;
	83	u64 mant:52;
	84	} parts;
	85	double d;
	86	u64 bits;
	87	} ieee754dp;
	88
	89	struct ieee754sp_konst {
	90	unsigned sign:1;
	91	unsigned bexp:8;
	92	unsigned mant:23;
	93	};
	94
	95	typedef union _ieee754sp {
	96	struct ieee754sp_konst parts;
	97	float f;
	98	u32 bits;
	99	} ieee754sp;
	100	#endif
	101
	102	/*
	103	* single precision (often aka float)
	104	*/
	105	int ieee754sp_finite(ieee754sp x);
	106	int ieee754sp_class(ieee754sp x);
	107
	108	ieee754sp ieee754sp_abs(ieee754sp x);
	109	ieee754sp ieee754sp_neg(ieee754sp x);
	110	ieee754sp ieee754sp_scalb(ieee754sp x, int);
	111	ieee754sp ieee754sp_logb(ieee754sp x);
	112
	113	/* x with sign of y */
	114	ieee754sp ieee754sp_copysign(ieee754sp x, ieee754sp y);
	115
	116	ieee754sp ieee754sp_add(ieee754sp x, ieee754sp y);
	117	ieee754sp ieee754sp_sub(ieee754sp x, ieee754sp y);
	118	ieee754sp ieee754sp_mul(ieee754sp x, ieee754sp y);
	119	ieee754sp ieee754sp_div(ieee754sp x, ieee754sp y);
	120
	121	ieee754sp ieee754sp_fint(int x);
	122	ieee754sp ieee754sp_funs(unsigned x);
	123	ieee754sp ieee754sp_flong(s64 x);
	124	ieee754sp ieee754sp_fulong(u64 x);
	125	ieee754sp ieee754sp_fdp(ieee754dp x);
	126
	127	int ieee754sp_tint(ieee754sp x);
	128	unsigned int ieee754sp_tuns(ieee754sp x);
	129	s64 ieee754sp_tlong(ieee754sp x);
	130	u64 ieee754sp_tulong(ieee754sp x);
	131
	132	int ieee754sp_cmp(ieee754sp x, ieee754sp y, int cop, int sig);
	133	/*
	134	* basic sp math
	135	*/
	136	ieee754sp ieee754sp_modf(ieee754sp x, ieee754sp * ip);
	137	ieee754sp ieee754sp_frexp(ieee754sp x, int *exp);
	138	ieee754sp ieee754sp_ldexp(ieee754sp x, int exp);
	139
	140	ieee754sp ieee754sp_ceil(ieee754sp x);
	141	ieee754sp ieee754sp_floor(ieee754sp x);
142	ieee754sp ieee754sp_trunc(ieee754sp x);
143
144	ieee754sp ieee754sp_sqrt(ieee754sp x);
145
146	/*
147	* double precision (often aka double)
148	*/
149	int ieee754dp_finite(ieee754dp x);
150	int ieee754dp_class(ieee754dp x);
151
152	/* x with sign of y */
153	ieee754dp ieee754dp_copysign(ieee754dp x, ieee754dp y);
154
155	ieee754dp ieee754dp_add(ieee754dp x, ieee754dp y);
156	ieee754dp ieee754dp_sub(ieee754dp x, ieee754dp y);
157	ieee754dp ieee754dp_mul(ieee754dp x, ieee754dp y);
158	ieee754dp ieee754dp_div(ieee754dp x, ieee754dp y);
159
160	ieee754dp ieee754dp_abs(ieee754dp x);
161	ieee754dp ieee754dp_neg(ieee754dp x);
162	ieee754dp ieee754dp_scalb(ieee754dp x, int);
163
164	/* return exponent as integer in floating point format
165	*/
166	ieee754dp ieee754dp_logb(ieee754dp x);
167
168	ieee754dp ieee754dp_fint(int x);
169	ieee754dp ieee754dp_funs(unsigned x);
170	ieee754dp ieee754dp_flong(s64 x);
171	ieee754dp ieee754dp_fulong(u64 x);
172	ieee754dp ieee754dp_fsp(ieee754sp x);
173
174	ieee754dp ieee754dp_ceil(ieee754dp x);
175	ieee754dp ieee754dp_floor(ieee754dp x);
176	ieee754dp ieee754dp_trunc(ieee754dp x);
177
178	int ieee754dp_tint(ieee754dp x);
179	unsigned int ieee754dp_tuns(ieee754dp x);
180	s64 ieee754dp_tlong(ieee754dp x);
181	u64 ieee754dp_tulong(ieee754dp x);
182
183	int ieee754dp_cmp(ieee754dp x, ieee754dp y, int cop, int sig);
184	/*
185	* basic sp math
186	*/
187	ieee754dp ieee754dp_modf(ieee754dp x, ieee754dp * ip);
188	ieee754dp ieee754dp_frexp(ieee754dp x, int *exp);
189	ieee754dp ieee754dp_ldexp(ieee754dp x, int exp);
190
191	ieee754dp ieee754dp_ceil(ieee754dp x);
192	ieee754dp ieee754dp_floor(ieee754dp x);
193	ieee754dp ieee754dp_trunc(ieee754dp x);
194
195	ieee754dp ieee754dp_sqrt(ieee754dp x);
196
197
198
199	/* 5 types of floating point number
200	*/
201	#define IEEE754_CLASS_NORM 0x00
202	#define IEEE754_CLASS_ZERO 0x01
203	#define IEEE754_CLASS_DNORM 0x02
204	#define IEEE754_CLASS_INF 0x03
205	#define IEEE754_CLASS_SNAN 0x04
206	#define IEEE754_CLASS_QNAN 0x05
1da177e4 LT	207
	208	/* exception numbers */
	209	#define IEEE754_INEXACT 0x01
	210	#define IEEE754_UNDERFLOW 0x02
	211	#define IEEE754_OVERFLOW 0x04
	212	#define IEEE754_ZERO_DIVIDE 0x08
	213	#define IEEE754_INVALID_OPERATION 0x10
	214
	215	/* cmp operators
	216	*/
	217	#define IEEE754_CLT 0x01
	218	#define IEEE754_CEQ 0x02
	219	#define IEEE754_CGT 0x04
	220	#define IEEE754_CUN 0x08
	221
	222	/* rounding mode
	223	*/
	224	#define IEEE754_RN 0 /* round to nearest */
	225	#define IEEE754_RZ 1 /* round toward zero */
	226	#define IEEE754_RD 2 /* round toward -Infinity */
	227	#define IEEE754_RU 3 /* round toward +Infinity */
	228
	229	/* other naming */
	230	#define IEEE754_RM IEEE754_RD
	231	#define IEEE754_RP IEEE754_RU
	232
	233	/* "normal" comparisons
	234	*/
cd21dfcf	235	static inline int ieee754sp_eq(ieee754sp x, ieee754sp y)
1da177e4 LT	236	{
	237	return ieee754sp_cmp(x, y, IEEE754_CEQ, 0);
	238	}
	239
cd21dfcf	240	static inline int ieee754sp_ne(ieee754sp x, ieee754sp y)
1da177e4 LT	241	{
	242	return ieee754sp_cmp(x, y,
	243	IEEE754_CLT \| IEEE754_CGT \| IEEE754_CUN, 0);
	244	}
	245
cd21dfcf	246	static inline int ieee754sp_lt(ieee754sp x, ieee754sp y)
1da177e4 LT	247	{
	248	return ieee754sp_cmp(x, y, IEEE754_CLT, 0);
	249	}
	250
cd21dfcf	251	static inline int ieee754sp_le(ieee754sp x, ieee754sp y)
1da177e4 LT	252	{
	253	return ieee754sp_cmp(x, y, IEEE754_CLT \| IEEE754_CEQ, 0);
	254	}
	255
cd21dfcf	256	static inline int ieee754sp_gt(ieee754sp x, ieee754sp y)
1da177e4 LT	257	{
	258	return ieee754sp_cmp(x, y, IEEE754_CGT, 0);
	259	}
	260
	261
cd21dfcf	262	static inline int ieee754sp_ge(ieee754sp x, ieee754sp y)
1da177e4 LT	263	{
	264	return ieee754sp_cmp(x, y, IEEE754_CGT \| IEEE754_CEQ, 0);
	265	}
	266
cd21dfcf	267	static inline int ieee754dp_eq(ieee754dp x, ieee754dp y)
1da177e4 LT	268	{
	269	return ieee754dp_cmp(x, y, IEEE754_CEQ, 0);
	270	}
	271
cd21dfcf	272	static inline int ieee754dp_ne(ieee754dp x, ieee754dp y)
1da177e4 LT	273	{
	274	return ieee754dp_cmp(x, y,
	275	IEEE754_CLT \| IEEE754_CGT \| IEEE754_CUN, 0);
	276	}
	277
cd21dfcf	278	static inline int ieee754dp_lt(ieee754dp x, ieee754dp y)
1da177e4 LT	279	{
	280	return ieee754dp_cmp(x, y, IEEE754_CLT, 0);
	281	}
	282
cd21dfcf	283	static inline int ieee754dp_le(ieee754dp x, ieee754dp y)
1da177e4 LT	284	{
	285	return ieee754dp_cmp(x, y, IEEE754_CLT \| IEEE754_CEQ, 0);
	286	}
	287
cd21dfcf	288	static inline int ieee754dp_gt(ieee754dp x, ieee754dp y)
1da177e4 LT	289	{
	290	return ieee754dp_cmp(x, y, IEEE754_CGT, 0);
	291	}
	292
cd21dfcf	293	static inline int ieee754dp_ge(ieee754dp x, ieee754dp y)
1da177e4 LT	294	{
	295	return ieee754dp_cmp(x, y, IEEE754_CGT \| IEEE754_CEQ, 0);
	296	}
	297
	298
cd21dfcf RB	299	/*
	300	* Like strtod
	301	*/
1da177e4 LT	302	ieee754dp ieee754dp_fstr(const char s, char *endp);
	303	char *ieee754dp_tstr(ieee754dp x, int prec, int fmt, int af);
	304
	305
cd21dfcf RB	306	/*
	307	* The control status register
	308	*/
	309	struct _ieee754_csr {
	310	#ifdef __BIG_ENDIAN
	311	unsigned pad0:7;
1da177e4	312	unsigned nod:1; /* set 1 for no denormalised numbers */
cd21dfcf RB	313	unsigned c:1; /* condition */
	314	unsigned pad1:5;
	315	unsigned cx:6; /* exceptions this operation */
1da177e4 LT	316	unsigned mx:5; /* exception enable mask */
	317	unsigned sx:5; /* exceptions total */
	318	unsigned rm:2; /* current rounding mode */
cd21dfcf RB	319	#endif
	320	#ifdef __LITTLE_ENDIAN
	321	unsigned rm:2; /* current rounding mode */
	322	unsigned sx:5; /* exceptions total */
	323	unsigned mx:5; /* exception enable mask */
	324	unsigned cx:6; /* exceptions this operation */
	325	unsigned pad1:5;
	326	unsigned c:1; /* condition */
	327	unsigned nod:1; /* set 1 for no denormalised numbers */
	328	unsigned pad0:7;
	329	#endif
1da177e4	330	};
eae89076	331	#define ieee754_csr ((struct _ieee754_csr )(&current->thread.fpu.fcr31))
1da177e4	332
cd21dfcf	333	static inline unsigned ieee754_getrm(void)
1da177e4 LT	334	{
	335	return (ieee754_csr.rm);
	336	}
cd21dfcf	337	static inline unsigned ieee754_setrm(unsigned rm)
1da177e4 LT	338	{
	339	return (ieee754_csr.rm = rm);
	340	}
	341
	342	/*
	343	* get current exceptions
	344	*/
cd21dfcf	345	static inline unsigned ieee754_getcx(void)
1da177e4 LT	346	{
	347	return (ieee754_csr.cx);
	348	}
	349
	350	/* test for current exception condition
	351	*/
cd21dfcf	352	static inline int ieee754_cxtest(unsigned n)
1da177e4 LT	353	{
	354	return (ieee754_csr.cx & n);
	355	}
	356
	357	/*
	358	* get sticky exceptions
	359	*/
cd21dfcf	360	static inline unsigned ieee754_getsx(void)
1da177e4 LT	361	{
	362	return (ieee754_csr.sx);
	363	}
	364
	365	/* clear sticky conditions
	366	*/
cd21dfcf	367	static inline unsigned ieee754_clrsx(void)
1da177e4 LT	368	{
	369	return (ieee754_csr.sx = 0);
	370	}
	371
	372	/* test for sticky exception condition
	373	*/
cd21dfcf	374	static inline int ieee754_sxtest(unsigned n)
1da177e4 LT	375	{
	376	return (ieee754_csr.sx & n);
	377	}
	378
	379	/* debugging */
	380	ieee754sp ieee754sp_dump(char *s, ieee754sp x);
	381	ieee754dp ieee754dp_dump(char *s, ieee754dp x);
	382
	383	#define IEEE754_SPCVAL_PZERO 0
	384	#define IEEE754_SPCVAL_NZERO 1
	385	#define IEEE754_SPCVAL_PONE 2
	386	#define IEEE754_SPCVAL_NONE 3
	387	#define IEEE754_SPCVAL_PTEN 4
	388	#define IEEE754_SPCVAL_NTEN 5
	389	#define IEEE754_SPCVAL_PINFINITY 6
	390	#define IEEE754_SPCVAL_NINFINITY 7
	391	#define IEEE754_SPCVAL_INDEF 8
	392	#define IEEE754_SPCVAL_PMAX 9 /* +max norm */
	393	#define IEEE754_SPCVAL_NMAX 10 /* -max norm */
	394	#define IEEE754_SPCVAL_PMIN 11 /* +min norm */
	395	#define IEEE754_SPCVAL_NMIN 12 /* +min norm */
	396	#define IEEE754_SPCVAL_PMIND 13 /* +min denorm */
	397	#define IEEE754_SPCVAL_NMIND 14 /* +min denorm */
	398	#define IEEE754_SPCVAL_P1E31 15 /* + 1.0e31 */
	399	#define IEEE754_SPCVAL_P1E63 16 /* + 1.0e63 */
	400
	401	extern const struct ieee754dp_konst __ieee754dp_spcvals[];
	402	extern const struct ieee754sp_konst __ieee754sp_spcvals[];
	403	#define ieee754dp_spcvals ((const ieee754dp *)__ieee754dp_spcvals)
	404	#define ieee754sp_spcvals ((const ieee754sp *)__ieee754sp_spcvals)
	405
cd21dfcf RB	406	/*
	407	* Return infinity with given sign
	408	*/
	409	#define ieee754dp_inf(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
	410	#define ieee754dp_zero(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
	411	#define ieee754dp_one(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
	412	#define ieee754dp_ten(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
	413	#define ieee754dp_indef() (ieee754dp_spcvals[IEEE754_SPCVAL_INDEF])
	414	#define ieee754dp_max(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
	415	#define ieee754dp_min(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
	416	#define ieee754dp_mind(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
	417	#define ieee754dp_1e31() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E31])
	418	#define ieee754dp_1e63() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E63])
	419
	420	#define ieee754sp_inf(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
	421	#define ieee754sp_zero(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
	422	#define ieee754sp_one(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
	423	#define ieee754sp_ten(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
	424	#define ieee754sp_indef() (ieee754sp_spcvals[IEEE754_SPCVAL_INDEF])
	425	#define ieee754sp_max(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
	426	#define ieee754sp_min(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
	427	#define ieee754sp_mind(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
	428	#define ieee754sp_1e31() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E31])
	429	#define ieee754sp_1e63() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E63])
	430
	431	/*
	432	* Indefinite integer value
	433	*/
1da177e4 LT	434	#define ieee754si_indef() INT_MAX
	435	#ifdef LONG_LONG_MAX
	436	#define ieee754di_indef() LONG_LONG_MAX
	437	#else
	438	#define ieee754di_indef() ((s64)(~0ULL>>1))
	439	#endif
	440
	441	/* IEEE exception context, passed to handler */
	442	struct ieee754xctx {
	443	const char op; / operation name */
	444	int rt; /* result type */
	445	union {
	446	ieee754sp sp; /* single precision */
	447	ieee754dp dp; /* double precision */
	448	#ifdef IEEE854_XP
	449	ieee754xp xp; /* extended precision */
	450	#endif
	451	int si; /* standard signed integer (32bits) */
	452	s64 di; /* extended signed integer (64bits) */
	453	} rv; /* default result format implied by op */
	454	va_list ap;
	455	};
	456
	457	/* result types for xctx.rt */
	458	#define IEEE754_RT_SP 0
	459	#define IEEE754_RT_DP 1
	460	#define IEEE754_RT_XP 2
	461	#define IEEE754_RT_SI 3
	462	#define IEEE754_RT_DI 4
	463
	464	extern void ieee754_xcpt(struct ieee754xctx *xcp);
	465
	466	/* compat */
	467	#define ieee754dp_fix(x) ieee754dp_tint(x)
	468	#define ieee754sp_fix(x) ieee754sp_tint(x)
a663bf90 RB	469
a663bf90 RB	470	#endif /* __ARCH_MIPS_MATH_EMU_IEEE754_H */