arch/arm/vfp/vfp.h - maze/linux - Git at Google

 /*
  *  linux/arch/arm/vfp/vfp.h
  *
  *  Copyright (C) 2004 ARM Limited.
  *  Written by Deep Blue Solutions Limited.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */

 static inline u32 vfp_shiftright32jamming(u32 val, unsigned int shift)
 {
 	if (shift) {
 		if (shift < 32)
 			val = val >> shift | ((val << (32 - shift)) != 0);
 		else
 			val = val != 0;
 	}
 	return val;
 }

 static inline u64 vfp_shiftright64jamming(u64 val, unsigned int shift)
 {
 	if (shift) {
 		if (shift < 64)
 			val = val >> shift | ((val << (64 - shift)) != 0);
 		else
 			val = val != 0;
 	}
 	return val;
 }

 static inline u32 vfp_hi64to32jamming(u64 val)
 {
 	u32 v;

 	asm(
 	"cmp	%Q1, #1		@ vfp_hi64to32jamming\n\t"
 	"movcc	%0, %R1\n\t"
 	"orrcs	%0, %R1, #1"
 	: "=r" (v) : "r" (val) : "cc");

 	return v;
 }

 static inline void add128(u64 *resh, u64 *resl, u64 nh, u64 nl, u64 mh, u64 ml)
 {
 	asm(	"adds	%Q0, %Q2, %Q4\n\t"
 		"adcs	%R0, %R2, %R4\n\t"
 		"adcs	%Q1, %Q3, %Q5\n\t"
 		"adc	%R1, %R3, %R5"
 	    : "=r" (nl), "=r" (nh)
 	    : "0" (nl), "1" (nh), "r" (ml), "r" (mh)
 	    : "cc");
 	*resh = nh;
 	*resl = nl;
 }

 static inline void sub128(u64 *resh, u64 *resl, u64 nh, u64 nl, u64 mh, u64 ml)
 {
 	asm(	"subs	%Q0, %Q2, %Q4\n\t"
 		"sbcs	%R0, %R2, %R4\n\t"
 		"sbcs	%Q1, %Q3, %Q5\n\t"
 		"sbc	%R1, %R3, %R5\n\t"
 	    : "=r" (nl), "=r" (nh)
 	    : "0" (nl), "1" (nh), "r" (ml), "r" (mh)
 	    : "cc");
 	*resh = nh;
 	*resl = nl;
 }

 static inline void mul64to128(u64 *resh, u64 *resl, u64 n, u64 m)
 {
 	u32 nh, nl, mh, ml;
 	u64 rh, rma, rmb, rl;

 	nl = n;
 	ml = m;
 	rl = (u64)nl * ml;

 	nh = n >> 32;
 	rma = (u64)nh * ml;

 	mh = m >> 32;
 	rmb = (u64)nl * mh;
 	rma += rmb;

 	rh = (u64)nh * mh;
 	rh += ((u64)(rma < rmb) << 32) + (rma >> 32);

 	rma <<= 32;
 	rl += rma;
 	rh += (rl < rma);

 	*resl = rl;
 	*resh = rh;
 }

 static inline void shift64left(u64 *resh, u64 *resl, u64 n)
 {
 	*resh = n >> 63;
 	*resl = n << 1;
 }

 static inline u64 vfp_hi64multiply64(u64 n, u64 m)
 {
 	u64 rh, rl;
 	mul64to128(&rh, &rl, n, m);
 	return rh | (rl != 0);
 }

 static inline u64 vfp_estimate_div128to64(u64 nh, u64 nl, u64 m)
 {
 	u64 mh, ml, remh, reml, termh, terml, z;

 	if (nh >= m)
 		return ~0ULL;
 	mh = m >> 32;
 	if (mh << 32 <= nh) {
 		z = 0xffffffff00000000ULL;
 	} else {
 		z = nh;
 		do_div(z, mh);
 		z <<= 32;
 	}
 	mul64to128(&termh, &terml, m, z);
 	sub128(&remh, &reml, nh, nl, termh, terml);
 	ml = m << 32;
 	while ((s64)remh < 0) {
 		z -= 0x100000000ULL;
 		add128(&remh, &reml, remh, reml, mh, ml);
 	}
 	remh = (remh << 32) | (reml >> 32);
 	if (mh << 32 <= remh) {
 		z |= 0xffffffff;
 	} else {
 		do_div(remh, mh);
 		z |= remh;
 	}
 	return z;
 }

 /*
  * Operations on unpacked elements
  */
 #define vfp_sign_negate(sign)	(sign ^ 0x8000)

 /*
  * Single-precision
  */
 struct vfp_single {
 	s16	exponent;
 	u16	sign;
 	u32	significand;
 };

 extern s32 vfp_get_float(unsigned int reg);
 extern void vfp_put_float(unsigned int reg, s32 val);

 /*
  * VFP_SINGLE_MANTISSA_BITS - number of bits in the mantissa
  * VFP_SINGLE_EXPONENT_BITS - number of bits in the exponent
  * VFP_SINGLE_LOW_BITS - number of low bits in the unpacked significand
  *  which are not propagated to the float upon packing.
  */
 #define VFP_SINGLE_MANTISSA_BITS	(23)
 #define VFP_SINGLE_EXPONENT_BITS	(8)
 #define VFP_SINGLE_LOW_BITS		(32 - VFP_SINGLE_MANTISSA_BITS - 2)
 #define VFP_SINGLE_LOW_BITS_MASK	((1 << VFP_SINGLE_LOW_BITS) - 1)

 /*
  * The bit in an unpacked float which indicates that it is a quiet NaN
  */
 #define VFP_SINGLE_SIGNIFICAND_QNAN	(1 << (VFP_SINGLE_MANTISSA_BITS - 1 + VFP_SINGLE_LOW_BITS))

 /*
  * Operations on packed single-precision numbers
  */
 #define vfp_single_packed_sign(v)	((v) & 0x80000000)
 #define vfp_single_packed_negate(v)	((v) ^ 0x80000000)
 #define vfp_single_packed_abs(v)	((v) & ~0x80000000)
 #define vfp_single_packed_exponent(v)	(((v) >> VFP_SINGLE_MANTISSA_BITS) & ((1 << VFP_SINGLE_EXPONENT_BITS) - 1))
 #define vfp_single_packed_mantissa(v)	((v) & ((1 << VFP_SINGLE_MANTISSA_BITS) - 1))

 /*
  * Unpack a single-precision float.  Note that this returns the magnitude
  * of the single-precision float mantissa with the 1. if necessary,
  * aligned to bit 30.
  */
 static inline void vfp_single_unpack(struct vfp_single *s, s32 val)
 {
 	u32 significand;

 	s->sign = vfp_single_packed_sign(val) >> 16,
 	s->exponent = vfp_single_packed_exponent(val);

 	significand = (u32) val;
 	significand = (significand << (32 - VFP_SINGLE_MANTISSA_BITS)) >> 2;
 	if (s->exponent && s->exponent != 255)
 		significand |= 0x40000000;
 	s->significand = significand;
 }

 /*
  * Re-pack a single-precision float.  This assumes that the float is
  * already normalised such that the MSB is bit 30, _not_ bit 31.
  */
 static inline s32 vfp_single_pack(struct vfp_single *s)
 {
 	u32 val;
 	val = (s->sign << 16) +
 	      (s->exponent << VFP_SINGLE_MANTISSA_BITS) +
 	      (s->significand >> VFP_SINGLE_LOW_BITS);
 	return (s32)val;
 }

 #define VFP_NUMBER		(1<<0)
 #define VFP_ZERO		(1<<1)
 #define VFP_DENORMAL		(1<<2)
 #define VFP_INFINITY		(1<<3)
 #define VFP_NAN			(1<<4)
 #define VFP_NAN_SIGNAL		(1<<5)

 #define VFP_QNAN		(VFP_NAN)
 #define VFP_SNAN		(VFP_NAN|VFP_NAN_SIGNAL)

 static inline int vfp_single_type(struct vfp_single *s)
 {
 	int type = VFP_NUMBER;
 	if (s->exponent == 255) {
 		if (s->significand == 0)
 			type = VFP_INFINITY;
 		else if (s->significand & VFP_SINGLE_SIGNIFICAND_QNAN)
 			type = VFP_QNAN;
 		else
 			type = VFP_SNAN;
 	} else if (s->exponent == 0) {
 		if (s->significand == 0)
 			type |= VFP_ZERO;
 		else
 			type |= VFP_DENORMAL;
 	}
 	return type;
 }

 #ifndef DEBUG
 #define vfp_single_normaliseround(sd,vsd,fpscr,except,func) __vfp_single_normaliseround(sd,vsd,fpscr,except)
 u32 __vfp_single_normaliseround(int sd, struct vfp_single *vs, u32 fpscr, u32 exceptions);
 #else
 u32 vfp_single_normaliseround(int sd, struct vfp_single *vs, u32 fpscr, u32 exceptions, const char *func);
 #endif

 /*
  * Double-precision
  */
 struct vfp_double {
 	s16	exponent;
 	u16	sign;
 	u64	significand;
 };

 /*
  * VFP_REG_ZERO is a special register number for vfp_get_double
  * which returns (double)0.0.  This is useful for the compare with
  * zero instructions.
  */
 #define VFP_REG_ZERO	16
 extern u64 vfp_get_double(unsigned int reg);
 extern void vfp_put_double(unsigned int reg, u64 val);

 #define VFP_DOUBLE_MANTISSA_BITS	(52)
 #define VFP_DOUBLE_EXPONENT_BITS	(11)
 #define VFP_DOUBLE_LOW_BITS		(64 - VFP_DOUBLE_MANTISSA_BITS - 2)
 #define VFP_DOUBLE_LOW_BITS_MASK	((1 << VFP_DOUBLE_LOW_BITS) - 1)

 /*
  * The bit in an unpacked double which indicates that it is a quiet NaN
  */
 #define VFP_DOUBLE_SIGNIFICAND_QNAN	(1ULL << (VFP_DOUBLE_MANTISSA_BITS - 1 + VFP_DOUBLE_LOW_BITS))

 /*
  * Operations on packed single-precision numbers
  */
 #define vfp_double_packed_sign(v)	((v) & (1ULL << 63))
 #define vfp_double_packed_negate(v)	((v) ^ (1ULL << 63))
 #define vfp_double_packed_abs(v)	((v) & ~(1ULL << 63))
 #define vfp_double_packed_exponent(v)	(((v) >> VFP_DOUBLE_MANTISSA_BITS) & ((1 << VFP_DOUBLE_EXPONENT_BITS) - 1))
 #define vfp_double_packed_mantissa(v)	((v) & ((1ULL << VFP_DOUBLE_MANTISSA_BITS) - 1))

 /*
  * Unpack a double-precision float.  Note that this returns the magnitude
  * of the double-precision float mantissa with the 1. if necessary,
  * aligned to bit 62.
  */
 static inline void vfp_double_unpack(struct vfp_double *s, s64 val)
 {
 	u64 significand;

 	s->sign = vfp_double_packed_sign(val) >> 48;
 	s->exponent = vfp_double_packed_exponent(val);

 	significand = (u64) val;
 	significand = (significand << (64 - VFP_DOUBLE_MANTISSA_BITS)) >> 2;
 	if (s->exponent && s->exponent != 2047)
 		significand |= (1ULL << 62);
 	s->significand = significand;
 }

 /*
  * Re-pack a double-precision float.  This assumes that the float is
  * already normalised such that the MSB is bit 30, _not_ bit 31.
  */
 static inline s64 vfp_double_pack(struct vfp_double *s)
 {
 	u64 val;
 	val = ((u64)s->sign << 48) +
 	      ((u64)s->exponent << VFP_DOUBLE_MANTISSA_BITS) +
 	      (s->significand >> VFP_DOUBLE_LOW_BITS);
 	return (s64)val;
 }

 static inline int vfp_double_type(struct vfp_double *s)
 {
 	int type = VFP_NUMBER;
 	if (s->exponent == 2047) {
 		if (s->significand == 0)
 			type = VFP_INFINITY;
 		else if (s->significand & VFP_DOUBLE_SIGNIFICAND_QNAN)
 			type = VFP_QNAN;
 		else
 			type = VFP_SNAN;
 	} else if (s->exponent == 0) {
 		if (s->significand == 0)
 			type |= VFP_ZERO;
 		else
 			type |= VFP_DENORMAL;
 	}
 	return type;
 }

 u32 vfp_double_normaliseround(int dd, struct vfp_double *vd, u32 fpscr, u32 exceptions, const char *func);

 /*
  * System registers
  */
 extern u32 vfp_get_sys(unsigned int reg);
 extern void vfp_put_sys(unsigned int reg, u32 val);

 u32 vfp_estimate_sqrt_significand(u32 exponent, u32 significand);

 /*
  * A special flag to tell the normalisation code not to normalise.
  */
 #define VFP_NAN_FLAG	0x100
	/*
	* linux/arch/arm/vfp/vfp.h
	*
	* Copyright (C) 2004 ARM Limited.
	* Written by Deep Blue Solutions Limited.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	static inline u32 vfp_shiftright32jamming(u32 val, unsigned int shift)
	{
	if (shift) {
	if (shift < 32)
	val = val >> shift \| ((val << (32 - shift)) != 0);
	else
	val = val != 0;
	}
	return val;
	}

	static inline u64 vfp_shiftright64jamming(u64 val, unsigned int shift)
	{
	if (shift) {
	if (shift < 64)
	val = val >> shift \| ((val << (64 - shift)) != 0);
	else
	val = val != 0;
	}
	return val;
	}

	static inline u32 vfp_hi64to32jamming(u64 val)
	{
	u32 v;

	asm(
	"cmp %Q1, #1 @ vfp_hi64to32jamming\n\t"
	"movcc %0, %R1\n\t"
	"orrcs %0, %R1, #1"
	: "=r" (v) : "r" (val) : "cc");

	return v;
	}

	static inline void add128(u64 resh, u64 resl, u64 nh, u64 nl, u64 mh, u64 ml)
	{
	asm( "adds %Q0, %Q2, %Q4\n\t"
	"adcs %R0, %R2, %R4\n\t"
	"adcs %Q1, %Q3, %Q5\n\t"
	"adc %R1, %R3, %R5"
	: "=r" (nl), "=r" (nh)
	: "0" (nl), "1" (nh), "r" (ml), "r" (mh)
	: "cc");
	*resh = nh;
	*resl = nl;
	}

	static inline void sub128(u64 resh, u64 resl, u64 nh, u64 nl, u64 mh, u64 ml)
	{
	asm( "subs %Q0, %Q2, %Q4\n\t"
	"sbcs %R0, %R2, %R4\n\t"
	"sbcs %Q1, %Q3, %Q5\n\t"
	"sbc %R1, %R3, %R5\n\t"
	: "=r" (nl), "=r" (nh)
	: "0" (nl), "1" (nh), "r" (ml), "r" (mh)
	: "cc");
	*resh = nh;
	*resl = nl;
	}

	static inline void mul64to128(u64 resh, u64 resl, u64 n, u64 m)
	{
	u32 nh, nl, mh, ml;
	u64 rh, rma, rmb, rl;

	nl = n;
	ml = m;
	rl = (u64)nl * ml;

	nh = n >> 32;
	rma = (u64)nh * ml;

	mh = m >> 32;
	rmb = (u64)nl * mh;
	rma += rmb;

	rh = (u64)nh * mh;
	rh += ((u64)(rma < rmb) << 32) + (rma >> 32);

	rma <<= 32;
	rl += rma;
	rh += (rl < rma);

	*resl = rl;
	*resh = rh;
	}

	static inline void shift64left(u64 resh, u64 resl, u64 n)
	{
	*resh = n >> 63;
	*resl = n << 1;
	}

	static inline u64 vfp_hi64multiply64(u64 n, u64 m)
	{
	u64 rh, rl;
	mul64to128(&rh, &rl, n, m);
	return rh \| (rl != 0);
	}

	static inline u64 vfp_estimate_div128to64(u64 nh, u64 nl, u64 m)
	{
	u64 mh, ml, remh, reml, termh, terml, z;

	if (nh >= m)
	return ~0ULL;
	mh = m >> 32;
	if (mh << 32 <= nh) {
	z = 0xffffffff00000000ULL;
	} else {
	z = nh;
	do_div(z, mh);
	z <<= 32;
	}
	mul64to128(&termh, &terml, m, z);
	sub128(&remh, &reml, nh, nl, termh, terml);
	ml = m << 32;
	while ((s64)remh < 0) {
	z -= 0x100000000ULL;
	add128(&remh, &reml, remh, reml, mh, ml);
	}
	remh = (remh << 32) \| (reml >> 32);
	if (mh << 32 <= remh) {
	z \|= 0xffffffff;
	} else {
	do_div(remh, mh);
	z \|= remh;
	}
	return z;
	}

	/*
	* Operations on unpacked elements
	*/
	#define vfp_sign_negate(sign) (sign ^ 0x8000)

	/*
	* Single-precision
	*/
	struct vfp_single {
	s16 exponent;
	u16 sign;
	u32 significand;
	};

	extern s32 vfp_get_float(unsigned int reg);
	extern void vfp_put_float(unsigned int reg, s32 val);

	/*
	* VFP_SINGLE_MANTISSA_BITS - number of bits in the mantissa
	* VFP_SINGLE_EXPONENT_BITS - number of bits in the exponent
	* VFP_SINGLE_LOW_BITS - number of low bits in the unpacked significand
	* which are not propagated to the float upon packing.
	*/
	#define VFP_SINGLE_MANTISSA_BITS (23)
	#define VFP_SINGLE_EXPONENT_BITS (8)
	#define VFP_SINGLE_LOW_BITS (32 - VFP_SINGLE_MANTISSA_BITS - 2)
	#define VFP_SINGLE_LOW_BITS_MASK ((1 << VFP_SINGLE_LOW_BITS) - 1)

	/*
	* The bit in an unpacked float which indicates that it is a quiet NaN
	*/
	#define VFP_SINGLE_SIGNIFICAND_QNAN (1 << (VFP_SINGLE_MANTISSA_BITS - 1 + VFP_SINGLE_LOW_BITS))

	/*
	* Operations on packed single-precision numbers
	*/
	#define vfp_single_packed_sign(v) ((v) & 0x80000000)
	#define vfp_single_packed_negate(v) ((v) ^ 0x80000000)
	#define vfp_single_packed_abs(v) ((v) & ~0x80000000)
	#define vfp_single_packed_exponent(v) (((v) >> VFP_SINGLE_MANTISSA_BITS) & ((1 << VFP_SINGLE_EXPONENT_BITS) - 1))
	#define vfp_single_packed_mantissa(v) ((v) & ((1 << VFP_SINGLE_MANTISSA_BITS) - 1))

	/*
	* Unpack a single-precision float. Note that this returns the magnitude
	* of the single-precision float mantissa with the 1. if necessary,
	* aligned to bit 30.
	*/
	static inline void vfp_single_unpack(struct vfp_single *s, s32 val)
	{
	u32 significand;

	s->sign = vfp_single_packed_sign(val) >> 16,
	s->exponent = vfp_single_packed_exponent(val);

	significand = (u32) val;
	significand = (significand << (32 - VFP_SINGLE_MANTISSA_BITS)) >> 2;
	if (s->exponent && s->exponent != 255)
	significand \|= 0x40000000;
	s->significand = significand;
	}

	/*
	* Re-pack a single-precision float. This assumes that the float is
	* already normalised such that the MSB is bit 30, _not_ bit 31.
	*/
	static inline s32 vfp_single_pack(struct vfp_single *s)
	{
	u32 val;
	val = (s->sign << 16) +
	(s->exponent << VFP_SINGLE_MANTISSA_BITS) +
	(s->significand >> VFP_SINGLE_LOW_BITS);
	return (s32)val;
	}

	#define VFP_NUMBER (1<<0)
	#define VFP_ZERO (1<<1)
	#define VFP_DENORMAL (1<<2)
	#define VFP_INFINITY (1<<3)
	#define VFP_NAN (1<<4)
	#define VFP_NAN_SIGNAL (1<<5)

	#define VFP_QNAN (VFP_NAN)
	#define VFP_SNAN (VFP_NAN\|VFP_NAN_SIGNAL)

	static inline int vfp_single_type(struct vfp_single *s)
	{
	int type = VFP_NUMBER;
	if (s->exponent == 255) {
	if (s->significand == 0)
	type = VFP_INFINITY;
	else if (s->significand & VFP_SINGLE_SIGNIFICAND_QNAN)
	type = VFP_QNAN;
	else
	type = VFP_SNAN;
	} else if (s->exponent == 0) {
	if (s->significand == 0)
	type \|= VFP_ZERO;
	else
	type \|= VFP_DENORMAL;
	}
	return type;
	}

	#ifndef DEBUG
	#define vfp_single_normaliseround(sd,vsd,fpscr,except,func) __vfp_single_normaliseround(sd,vsd,fpscr,except)
	u32 __vfp_single_normaliseround(int sd, struct vfp_single *vs, u32 fpscr, u32 exceptions);
	#else
	u32 vfp_single_normaliseround(int sd, struct vfp_single vs, u32 fpscr, u32 exceptions, const char func);
	#endif

	/*
	* Double-precision
	*/
	struct vfp_double {
	s16 exponent;
	u16 sign;
	u64 significand;
	};

	/*
	* VFP_REG_ZERO is a special register number for vfp_get_double
	* which returns (double)0.0. This is useful for the compare with
	* zero instructions.
	*/
	#define VFP_REG_ZERO 16
	extern u64 vfp_get_double(unsigned int reg);
	extern void vfp_put_double(unsigned int reg, u64 val);

	#define VFP_DOUBLE_MANTISSA_BITS (52)
	#define VFP_DOUBLE_EXPONENT_BITS (11)
	#define VFP_DOUBLE_LOW_BITS (64 - VFP_DOUBLE_MANTISSA_BITS - 2)
	#define VFP_DOUBLE_LOW_BITS_MASK ((1 << VFP_DOUBLE_LOW_BITS) - 1)

	/*
	* The bit in an unpacked double which indicates that it is a quiet NaN
	*/
	#define VFP_DOUBLE_SIGNIFICAND_QNAN (1ULL << (VFP_DOUBLE_MANTISSA_BITS - 1 + VFP_DOUBLE_LOW_BITS))

	/*
	* Operations on packed single-precision numbers
	*/
	#define vfp_double_packed_sign(v) ((v) & (1ULL << 63))
	#define vfp_double_packed_negate(v) ((v) ^ (1ULL << 63))
	#define vfp_double_packed_abs(v) ((v) & ~(1ULL << 63))
	#define vfp_double_packed_exponent(v) (((v) >> VFP_DOUBLE_MANTISSA_BITS) & ((1 << VFP_DOUBLE_EXPONENT_BITS) - 1))
	#define vfp_double_packed_mantissa(v) ((v) & ((1ULL << VFP_DOUBLE_MANTISSA_BITS) - 1))

	/*
	* Unpack a double-precision float. Note that this returns the magnitude
	* of the double-precision float mantissa with the 1. if necessary,
	* aligned to bit 62.
	*/
	static inline void vfp_double_unpack(struct vfp_double *s, s64 val)
	{
	u64 significand;

	s->sign = vfp_double_packed_sign(val) >> 48;
	s->exponent = vfp_double_packed_exponent(val);

	significand = (u64) val;
	significand = (significand << (64 - VFP_DOUBLE_MANTISSA_BITS)) >> 2;
	if (s->exponent && s->exponent != 2047)
	significand \|= (1ULL << 62);
	s->significand = significand;
	}

	/*
	* Re-pack a double-precision float. This assumes that the float is
	* already normalised such that the MSB is bit 30, _not_ bit 31.
	*/
	static inline s64 vfp_double_pack(struct vfp_double *s)
	{
	u64 val;
	val = ((u64)s->sign << 48) +
	((u64)s->exponent << VFP_DOUBLE_MANTISSA_BITS) +
	(s->significand >> VFP_DOUBLE_LOW_BITS);
	return (s64)val;
	}

	static inline int vfp_double_type(struct vfp_double *s)
	{
	int type = VFP_NUMBER;
	if (s->exponent == 2047) {
	if (s->significand == 0)
	type = VFP_INFINITY;
	else if (s->significand & VFP_DOUBLE_SIGNIFICAND_QNAN)
	type = VFP_QNAN;
	else
	type = VFP_SNAN;
	} else if (s->exponent == 0) {
	if (s->significand == 0)
	type \|= VFP_ZERO;
	else
	type \|= VFP_DENORMAL;
	}
	return type;
	}

	u32 vfp_double_normaliseround(int dd, struct vfp_double vd, u32 fpscr, u32 exceptions, const char func);

	/*
	* System registers
	*/
	extern u32 vfp_get_sys(unsigned int reg);
	extern void vfp_put_sys(unsigned int reg, u32 val);

	u32 vfp_estimate_sqrt_significand(u32 exponent, u32 significand);

	/*
	* A special flag to tell the normalisation code not to normalise.
	*/
	#define VFP_NAN_FLAG 0x100