arch/mips/math-emu/ieee754.h - kernel/msm-4.19 - Gitiles

 /*
  * 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 <linux/compiler.h>
 #include <asm/byteorder.h>
 #include <linux/types.h>
 #include <linux/sched.h>
 #include <asm/bitfield.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

 struct ieee754dp_const {
 	__BITFIELD_FIELD(unsigned sign:1,
 	__BITFIELD_FIELD(unsigned bexp:11,
 	__BITFIELD_FIELD(unsigned manthi:20,
 	__BITFIELD_FIELD(unsigned mantlo:32,
 	;))))
 };

 typedef union _ieee754dp {
 	struct ieee754dp_const oparts;
 	struct {
 		__BITFIELD_FIELD(unsigned int sign:1,
 		__BITFIELD_FIELD(unsigned int bexp:11,
 		__BITFIELD_FIELD(u64 mant:52,
 		;)))
 	} parts;
 	double d;
 	u64 bits;
 } ieee754dp;

 struct ieee754sp_const {
 	__BITFIELD_FIELD(unsigned sign:1,
 	__BITFIELD_FIELD(unsigned bexp:8,
 	__BITFIELD_FIELD(unsigned mant:23,
 	;)))
 };

 typedef union _ieee754sp {
 	struct ieee754sp_const parts;
 	float f;
 	u32 bits;
 } ieee754sp;

 /*
  * 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 {
 	__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 */
 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_const __ieee754dp_spcvals[];
 extern const struct ieee754sp_const __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 __cold 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 */
	/*
	* 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 <linux/compiler.h>
	#include <asm/byteorder.h>
	#include <linux/types.h>
	#include <linux/sched.h>
	#include <asm/bitfield.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

	struct ieee754dp_const {
	__BITFIELD_FIELD(unsigned sign:1,
	__BITFIELD_FIELD(unsigned bexp:11,
	__BITFIELD_FIELD(unsigned manthi:20,
	__BITFIELD_FIELD(unsigned mantlo:32,
	;))))
	};

	typedef union _ieee754dp {
	struct ieee754dp_const oparts;
	struct {
	__BITFIELD_FIELD(unsigned int sign:1,
	__BITFIELD_FIELD(unsigned int bexp:11,
	__BITFIELD_FIELD(u64 mant:52,
	;)))
	} parts;
	double d;
	u64 bits;
	} ieee754dp;

	struct ieee754sp_const {
	__BITFIELD_FIELD(unsigned sign:1,
	__BITFIELD_FIELD(unsigned bexp:8,
	__BITFIELD_FIELD(unsigned mant:23,
	;)))
	};

	typedef union _ieee754sp {
	struct ieee754sp_const parts;
	float f;
	u32 bits;
	} ieee754sp;

	/*
	* 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 {
	__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 */
	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_const __ieee754dp_spcvals[];
	extern const struct ieee754sp_const __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 __cold 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 */