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

/*
 * MIPS floating point support
 * Copyright (C) 1994-2000 Algorithmics Ltd.
 * http://www.algor.co.uk
 *
 *  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.soft.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.
	4	* http://www.algor.co.uk
	5	*
1da177e4 LT	6	* This program is free software; you can distribute it and/or modify it
	7	* under the terms of the GNU General Public License (Version 2) as
	8	* published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope it will be useful, but WITHOUT
	11	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	12	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	13	* for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License along
	16	* with this program; if not, write to the Free Software Foundation, Inc.,
	17	* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
	18	*
1da177e4 LT	19	* Nov 7, 2000
	20	* Modification to allow integration with Linux kernel
	21	*
	22	* Kevin D. Kissell, kevink@mips.com and Carsten Langgard, carstenl@mips.com
	23	* Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
cd21dfcf	24	*/
a663bf90 RB	25	#ifndef __ARCH_MIPS_MATH_EMU_IEEE754_H
a663bf90 RB	26	#define __ARCH_MIPS_MATH_EMU_IEEE754_H
1da177e4	27
cd21dfcf	28	#include <asm/byteorder.h>
1da177e4	29	#include <linux/types.h>
cd21dfcf	30	#include <linux/sched.h>
1da177e4 LT	31
	32	/*
	33	* Not very pretty, but the Linux kernel's normal va_list definition
	34	* does not allow it to be used as a structure element, as it is here.
	35	*/
	36	#ifndef _STDARG_H
	37	#include <stdarg.h>
	38	#endif
	39
cd21dfcf	40	#ifdef __LITTLE_ENDIAN
1da177e4 LT	41	struct ieee754dp_konst {
	42	unsigned mantlo:32;
	43	unsigned manthi:20;
	44	unsigned bexp:11;
	45	unsigned sign:1;
	46	};
	47	struct ieee754sp_konst {
	48	unsigned mant:23;
	49	unsigned bexp:8;
	50	unsigned sign:1;
	51	};
	52
	53	typedef union _ieee754dp {
	54	struct ieee754dp_konst oparts;
	55	struct {
	56	u64 mant:52;
	57	unsigned int bexp:11;
	58	unsigned int sign:1;
	59	} parts;
	60	u64 bits;
	61	double d;
	62	} ieee754dp;
	63
	64	typedef union _ieee754sp {
	65	struct ieee754sp_konst parts;
	66	float f;
	67	u32 bits;
	68	} ieee754sp;
	69	#endif
	70
cd21dfcf	71	#ifdef __BIG_ENDIAN
1da177e4 LT	72	struct ieee754dp_konst {
	73	unsigned sign:1;
	74	unsigned bexp:11;
	75	unsigned manthi:20;
	76	unsigned mantlo:32;
	77	};
cd21dfcf	78
1da177e4 LT	79	typedef union _ieee754dp {
	80	struct ieee754dp_konst oparts;
	81	struct {
	82	unsigned int sign:1;
	83	unsigned int bexp:11;
	84	u64 mant:52;
	85	} parts;
	86	double d;
	87	u64 bits;
	88	} ieee754dp;
	89
	90	struct ieee754sp_konst {
	91	unsigned sign:1;
	92	unsigned bexp:8;
	93	unsigned mant:23;
	94	};
	95
	96	typedef union _ieee754sp {
	97	struct ieee754sp_konst parts;
	98	float f;
	99	u32 bits;
	100	} ieee754sp;
	101	#endif
	102
	103	/*
	104	* single precision (often aka float)
	105	*/
	106	int ieee754sp_finite(ieee754sp x);
	107	int ieee754sp_class(ieee754sp x);
	108
	109	ieee754sp ieee754sp_abs(ieee754sp x);
	110	ieee754sp ieee754sp_neg(ieee754sp x);
	111	ieee754sp ieee754sp_scalb(ieee754sp x, int);
	112	ieee754sp ieee754sp_logb(ieee754sp x);
	113
	114	/* x with sign of y */
	115	ieee754sp ieee754sp_copysign(ieee754sp x, ieee754sp y);
	116
	117	ieee754sp ieee754sp_add(ieee754sp x, ieee754sp y);
	118	ieee754sp ieee754sp_sub(ieee754sp x, ieee754sp y);
	119	ieee754sp ieee754sp_mul(ieee754sp x, ieee754sp y);
	120	ieee754sp ieee754sp_div(ieee754sp x, ieee754sp y);
	121
	122	ieee754sp ieee754sp_fint(int x);
	123	ieee754sp ieee754sp_funs(unsigned x);
	124	ieee754sp ieee754sp_flong(s64 x);
	125	ieee754sp ieee754sp_fulong(u64 x);
	126	ieee754sp ieee754sp_fdp(ieee754dp x);
	127
	128	int ieee754sp_tint(ieee754sp x);
	129	unsigned int ieee754sp_tuns(ieee754sp x);
	130	s64 ieee754sp_tlong(ieee754sp x);
	131	u64 ieee754sp_tulong(ieee754sp x);
	132
	133	int ieee754sp_cmp(ieee754sp x, ieee754sp y, int cop, int sig);
	134	/*
	135	* basic sp math
	136	*/
	137	ieee754sp ieee754sp_modf(ieee754sp x, ieee754sp * ip);
	138	ieee754sp ieee754sp_frexp(ieee754sp x, int *exp);
	139	ieee754sp ieee754sp_ldexp(ieee754sp x, int exp);
	140
	141	ieee754sp ieee754sp_ceil(ieee754sp x);
	142	ieee754sp ieee754sp_floor(ieee754sp x);
143	ieee754sp ieee754sp_trunc(ieee754sp x);
144
145	ieee754sp ieee754sp_sqrt(ieee754sp x);
146
147	/*
148	* double precision (often aka double)
149	*/
150	int ieee754dp_finite(ieee754dp x);
151	int ieee754dp_class(ieee754dp x);
152
153	/* x with sign of y */
154	ieee754dp ieee754dp_copysign(ieee754dp x, ieee754dp y);
155
156	ieee754dp ieee754dp_add(ieee754dp x, ieee754dp y);
157	ieee754dp ieee754dp_sub(ieee754dp x, ieee754dp y);
158	ieee754dp ieee754dp_mul(ieee754dp x, ieee754dp y);
159	ieee754dp ieee754dp_div(ieee754dp x, ieee754dp y);
160
161	ieee754dp ieee754dp_abs(ieee754dp x);
162	ieee754dp ieee754dp_neg(ieee754dp x);
163	ieee754dp ieee754dp_scalb(ieee754dp x, int);
164
165	/* return exponent as integer in floating point format
166	*/
167	ieee754dp ieee754dp_logb(ieee754dp x);
168
169	ieee754dp ieee754dp_fint(int x);
170	ieee754dp ieee754dp_funs(unsigned x);
171	ieee754dp ieee754dp_flong(s64 x);
172	ieee754dp ieee754dp_fulong(u64 x);
173	ieee754dp ieee754dp_fsp(ieee754sp x);
174
175	ieee754dp ieee754dp_ceil(ieee754dp x);
176	ieee754dp ieee754dp_floor(ieee754dp x);
177	ieee754dp ieee754dp_trunc(ieee754dp x);
178
179	int ieee754dp_tint(ieee754dp x);
180	unsigned int ieee754dp_tuns(ieee754dp x);
181	s64 ieee754dp_tlong(ieee754dp x);
182	u64 ieee754dp_tulong(ieee754dp x);
183
184	int ieee754dp_cmp(ieee754dp x, ieee754dp y, int cop, int sig);
185	/*
186	* basic sp math
187	*/
188	ieee754dp ieee754dp_modf(ieee754dp x, ieee754dp * ip);
189	ieee754dp ieee754dp_frexp(ieee754dp x, int *exp);
190	ieee754dp ieee754dp_ldexp(ieee754dp x, int exp);
191
192	ieee754dp ieee754dp_ceil(ieee754dp x);
193	ieee754dp ieee754dp_floor(ieee754dp x);
194	ieee754dp ieee754dp_trunc(ieee754dp x);
195
196	ieee754dp ieee754dp_sqrt(ieee754dp x);
197
198
199
200	/* 5 types of floating point number
201	*/
202	#define IEEE754_CLASS_NORM 0x00
203	#define IEEE754_CLASS_ZERO 0x01
204	#define IEEE754_CLASS_DNORM 0x02
205	#define IEEE754_CLASS_INF 0x03
206	#define IEEE754_CLASS_SNAN 0x04
207	#define IEEE754_CLASS_QNAN 0x05
1da177e4 LT	208
	209	/* exception numbers */
	210	#define IEEE754_INEXACT 0x01
	211	#define IEEE754_UNDERFLOW 0x02
	212	#define IEEE754_OVERFLOW 0x04
	213	#define IEEE754_ZERO_DIVIDE 0x08
	214	#define IEEE754_INVALID_OPERATION 0x10
	215
	216	/* cmp operators
	217	*/
	218	#define IEEE754_CLT 0x01
	219	#define IEEE754_CEQ 0x02
	220	#define IEEE754_CGT 0x04
	221	#define IEEE754_CUN 0x08
	222
	223	/* rounding mode
	224	*/
	225	#define IEEE754_RN 0 /* round to nearest */
	226	#define IEEE754_RZ 1 /* round toward zero */
	227	#define IEEE754_RD 2 /* round toward -Infinity */
	228	#define IEEE754_RU 3 /* round toward +Infinity */
	229
	230	/* other naming */
	231	#define IEEE754_RM IEEE754_RD
	232	#define IEEE754_RP IEEE754_RU
	233
	234	/* "normal" comparisons
	235	*/
cd21dfcf	236	static inline int ieee754sp_eq(ieee754sp x, ieee754sp y)
1da177e4 LT	237	{
	238	return ieee754sp_cmp(x, y, IEEE754_CEQ, 0);
	239	}
	240
cd21dfcf	241	static inline int ieee754sp_ne(ieee754sp x, ieee754sp y)
1da177e4 LT	242	{
	243	return ieee754sp_cmp(x, y,
	244	IEEE754_CLT \| IEEE754_CGT \| IEEE754_CUN, 0);
	245	}
	246
cd21dfcf	247	static inline int ieee754sp_lt(ieee754sp x, ieee754sp y)
1da177e4 LT	248	{
	249	return ieee754sp_cmp(x, y, IEEE754_CLT, 0);
	250	}
	251
cd21dfcf	252	static inline int ieee754sp_le(ieee754sp x, ieee754sp y)
1da177e4 LT	253	{
	254	return ieee754sp_cmp(x, y, IEEE754_CLT \| IEEE754_CEQ, 0);
	255	}
	256
cd21dfcf	257	static inline int ieee754sp_gt(ieee754sp x, ieee754sp y)
1da177e4 LT	258	{
	259	return ieee754sp_cmp(x, y, IEEE754_CGT, 0);
	260	}
	261
	262
cd21dfcf	263	static inline int ieee754sp_ge(ieee754sp x, ieee754sp y)
1da177e4 LT	264	{
	265	return ieee754sp_cmp(x, y, IEEE754_CGT \| IEEE754_CEQ, 0);
	266	}
	267
cd21dfcf	268	static inline int ieee754dp_eq(ieee754dp x, ieee754dp y)
1da177e4 LT	269	{
	270	return ieee754dp_cmp(x, y, IEEE754_CEQ, 0);
	271	}
	272
cd21dfcf	273	static inline int ieee754dp_ne(ieee754dp x, ieee754dp y)
1da177e4 LT	274	{
	275	return ieee754dp_cmp(x, y,
	276	IEEE754_CLT \| IEEE754_CGT \| IEEE754_CUN, 0);
	277	}
	278
cd21dfcf	279	static inline int ieee754dp_lt(ieee754dp x, ieee754dp y)
1da177e4 LT	280	{
	281	return ieee754dp_cmp(x, y, IEEE754_CLT, 0);
	282	}
	283
cd21dfcf	284	static inline int ieee754dp_le(ieee754dp x, ieee754dp y)
1da177e4 LT	285	{
	286	return ieee754dp_cmp(x, y, IEEE754_CLT \| IEEE754_CEQ, 0);
	287	}
	288
cd21dfcf	289	static inline int ieee754dp_gt(ieee754dp x, ieee754dp y)
1da177e4 LT	290	{
	291	return ieee754dp_cmp(x, y, IEEE754_CGT, 0);
	292	}
	293
cd21dfcf	294	static inline int ieee754dp_ge(ieee754dp x, ieee754dp y)
1da177e4 LT	295	{
	296	return ieee754dp_cmp(x, y, IEEE754_CGT \| IEEE754_CEQ, 0);
	297	}
	298
	299
cd21dfcf RB	300	/*
	301	* Like strtod
	302	*/
1da177e4 LT	303	ieee754dp ieee754dp_fstr(const char s, char *endp);
	304	char *ieee754dp_tstr(ieee754dp x, int prec, int fmt, int af);
	305
	306
cd21dfcf RB	307	/*
	308	* The control status register
	309	*/
	310	struct _ieee754_csr {
	311	#ifdef __BIG_ENDIAN
	312	unsigned pad0:7;
1da177e4	313	unsigned nod:1; /* set 1 for no denormalised numbers */
cd21dfcf RB	314	unsigned c:1; /* condition */
	315	unsigned pad1:5;
	316	unsigned cx:6; /* exceptions this operation */
1da177e4 LT	317	unsigned mx:5; /* exception enable mask */
	318	unsigned sx:5; /* exceptions total */
	319	unsigned rm:2; /* current rounding mode */
cd21dfcf RB	320	#endif
	321	#ifdef __LITTLE_ENDIAN
	322	unsigned rm:2; /* current rounding mode */
	323	unsigned sx:5; /* exceptions total */
	324	unsigned mx:5; /* exception enable mask */
	325	unsigned cx:6; /* exceptions this operation */
	326	unsigned pad1:5;
	327	unsigned c:1; /* condition */
	328	unsigned nod:1; /* set 1 for no denormalised numbers */
	329	unsigned pad0:7;
	330	#endif
1da177e4	331	};
cd21dfcf	332	#define ieee754_csr ((struct _ieee754_csr )(&current->thread.fpu.soft.fcr31))
1da177e4	333
cd21dfcf	334	static inline unsigned ieee754_getrm(void)
1da177e4 LT	335	{
	336	return (ieee754_csr.rm);
	337	}
cd21dfcf	338	static inline unsigned ieee754_setrm(unsigned rm)
1da177e4 LT	339	{
	340	return (ieee754_csr.rm = rm);
	341	}
	342
	343	/*
	344	* get current exceptions
	345	*/
cd21dfcf	346	static inline unsigned ieee754_getcx(void)
1da177e4 LT	347	{
	348	return (ieee754_csr.cx);
	349	}
	350
	351	/* test for current exception condition
	352	*/
cd21dfcf	353	static inline int ieee754_cxtest(unsigned n)
1da177e4 LT	354	{
	355	return (ieee754_csr.cx & n);
	356	}
	357
	358	/*
	359	* get sticky exceptions
	360	*/
cd21dfcf	361	static inline unsigned ieee754_getsx(void)
1da177e4 LT	362	{
	363	return (ieee754_csr.sx);
	364	}
	365
	366	/* clear sticky conditions
	367	*/
cd21dfcf	368	static inline unsigned ieee754_clrsx(void)
1da177e4 LT	369	{
	370	return (ieee754_csr.sx = 0);
	371	}
	372
	373	/* test for sticky exception condition
	374	*/
cd21dfcf	375	static inline int ieee754_sxtest(unsigned n)
1da177e4 LT	376	{
	377	return (ieee754_csr.sx & n);
	378	}
	379
	380	/* debugging */
	381	ieee754sp ieee754sp_dump(char *s, ieee754sp x);
	382	ieee754dp ieee754dp_dump(char *s, ieee754dp x);
	383
	384	#define IEEE754_SPCVAL_PZERO 0
	385	#define IEEE754_SPCVAL_NZERO 1
	386	#define IEEE754_SPCVAL_PONE 2
	387	#define IEEE754_SPCVAL_NONE 3
	388	#define IEEE754_SPCVAL_PTEN 4
	389	#define IEEE754_SPCVAL_NTEN 5
	390	#define IEEE754_SPCVAL_PINFINITY 6
	391	#define IEEE754_SPCVAL_NINFINITY 7
	392	#define IEEE754_SPCVAL_INDEF 8
	393	#define IEEE754_SPCVAL_PMAX 9 /* +max norm */
	394	#define IEEE754_SPCVAL_NMAX 10 /* -max norm */
	395	#define IEEE754_SPCVAL_PMIN 11 /* +min norm */
	396	#define IEEE754_SPCVAL_NMIN 12 /* +min norm */
	397	#define IEEE754_SPCVAL_PMIND 13 /* +min denorm */
	398	#define IEEE754_SPCVAL_NMIND 14 /* +min denorm */
	399	#define IEEE754_SPCVAL_P1E31 15 /* + 1.0e31 */
	400	#define IEEE754_SPCVAL_P1E63 16 /* + 1.0e63 */
	401
	402	extern const struct ieee754dp_konst __ieee754dp_spcvals[];
	403	extern const struct ieee754sp_konst __ieee754sp_spcvals[];
	404	#define ieee754dp_spcvals ((const ieee754dp *)__ieee754dp_spcvals)
	405	#define ieee754sp_spcvals ((const ieee754sp *)__ieee754sp_spcvals)
	406
cd21dfcf RB	407	/*
	408	* Return infinity with given sign
	409	*/
	410	#define ieee754dp_inf(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
	411	#define ieee754dp_zero(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
	412	#define ieee754dp_one(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
	413	#define ieee754dp_ten(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
	414	#define ieee754dp_indef() (ieee754dp_spcvals[IEEE754_SPCVAL_INDEF])
	415	#define ieee754dp_max(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
	416	#define ieee754dp_min(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
	417	#define ieee754dp_mind(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
	418	#define ieee754dp_1e31() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E31])
	419	#define ieee754dp_1e63() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E63])
	420
	421	#define ieee754sp_inf(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)])
	422	#define ieee754sp_zero(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PZERO+(sn)])
	423	#define ieee754sp_one(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PONE+(sn)])
	424	#define ieee754sp_ten(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PTEN+(sn)])
	425	#define ieee754sp_indef() (ieee754sp_spcvals[IEEE754_SPCVAL_INDEF])
	426	#define ieee754sp_max(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMAX+(sn)])
	427	#define ieee754sp_min(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIN+(sn)])
	428	#define ieee754sp_mind(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIND+(sn)])
	429	#define ieee754sp_1e31() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E31])
	430	#define ieee754sp_1e63() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E63])
	431
	432	/*
	433	* Indefinite integer value
	434	*/
1da177e4 LT	435	#define ieee754si_indef() INT_MAX
	436	#ifdef LONG_LONG_MAX
	437	#define ieee754di_indef() LONG_LONG_MAX
	438	#else
	439	#define ieee754di_indef() ((s64)(~0ULL>>1))
	440	#endif
	441
	442	/* IEEE exception context, passed to handler */
	443	struct ieee754xctx {
	444	const char op; / operation name */
	445	int rt; /* result type */
	446	union {
	447	ieee754sp sp; /* single precision */
	448	ieee754dp dp; /* double precision */
	449	#ifdef IEEE854_XP
	450	ieee754xp xp; /* extended precision */
	451	#endif
	452	int si; /* standard signed integer (32bits) */
	453	s64 di; /* extended signed integer (64bits) */
	454	} rv; /* default result format implied by op */
	455	va_list ap;
	456	};
	457
	458	/* result types for xctx.rt */
	459	#define IEEE754_RT_SP 0
	460	#define IEEE754_RT_DP 1
	461	#define IEEE754_RT_XP 2
	462	#define IEEE754_RT_SI 3
	463	#define IEEE754_RT_DI 4
	464
	465	extern void ieee754_xcpt(struct ieee754xctx *xcp);
	466
	467	/* compat */
	468	#define ieee754dp_fix(x) ieee754dp_tint(x)
	469	#define ieee754sp_fix(x) ieee754sp_tint(x)
a663bf90 RB	470
a663bf90 RB	471	#endif /* __ARCH_MIPS_MATH_EMU_IEEE754_H */