pspfpu.h File Reference

#include <stdint.h>

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Macros
#define	PSP_FPU_RM_MASK   0x03
	Mask value for rounding mode.
#define	PSP_FPU_FLAGS_POS   2
	Bit position of the flag bits.
#define	PSP_FPU_ENABLE_POS   7
	Bit position of the enable bits.
#define	PSP_FPU_CAUSE_POS   12
	Bit position of the cause bits.
#define	PSP_FPU_CC0_POS   23
	Bit position of the cc0 bit.
#define	PSP_FPU_FS_POS   24
	Bit position of the fs bit.
#define	PSP_FPU_CC17_POS   25
	Bit position of the cc1->7 bits.
#define	PSP_FPU_FLAGS_MASK   (0x1F << PSP_FPU_FLAGS_POS)
#define	PSP_FPU_ENABLE_MASK   (0x1F << PSP_FPU_ENABLE_POS)
#define	PSP_FPU_CAUSE_MASK   (0x3F << PSP_FPU_CAUSE_POS)
#define	PSP_FPU_CC0_MASK   (1 << PSP_FPU_CC0_POS)
#define	PSP_FPU_FS_MASK   (1 << PSP_FPU_FS_POS)
#define	PSP_FPU_CC17_MASK   (0x7F << PSP_FPU_CC17_POS)

Enumerations
enum	PspFpuRoundMode { PSP_FPU_RN = 0 , PSP_FPU_RZ = 1 , PSP_FPU_RP = 2 , PSP_FPU_RM = 3 }
	Enumeration for FPU rounding modes. More...
enum	PspFpuExceptions {   PSP_FPU_EXCEPTION_INEXACT = 0x01 , PSP_FPU_EXCEPTION_UNDERFLOW = 0x02 , PSP_FPU_EXCEPTION_OVERFLOW = 0x04 , PSP_FPU_EXCEPTION_DIVBYZERO = 0x08 ,   PSP_FPU_EXCEPTION_INVALIDOP = 0x10 , PSP_FPU_EXCEPTION_UNIMPOP = 0x20 , PSP_FPU_EXCEPTION_ALL = 0x3F }
	Enumeration for FPU exceptions. More...

Functions
uint32_t	pspFpuGetFCR31 (void)
	Get the current value of the control/status register.
void	pspFpuSetFCR31 (uint32_t var)
	Set the current value of the control/status register.
void	pspFpuSetRoundmode (enum PspFpuRoundMode mode)
	Set the current round mode.
enum PspFpuRoundMode	pspFpuGetRoundmode (void)
	Get the current round mode.
uint32_t	pspFpuGetFlags (void)
	Get the exception flags (set when an exception occurs but the actual exception bit is not enabled)
void	pspFpuClearFlags (uint32_t clear)
	Clear the flags bits.
uint32_t	pspFpuGetEnable (void)
	Get the exception enable flags.
void	pspFpuSetEnable (uint32_t enable)
	Set the enable flags bits.
uint32_t	pspFpuGetCause (void)
	Get the cause bits (only useful if you installed your own exception handler)
void	pspFpuClearCause (uint32_t clear)
	Clear the cause bits.
uint32_t	pspFpuGetFS (void)
	Get the current value of the FS bit (if FS is 0 then an exception occurs with denormalized values, if 1 then they are rewritten as 0.
void	pspFpuSetFS (uint32_t fs)
	Set the FS bit.
uint32_t	pspFpuGetCondbits (void)
	Get the condition flags (8 bits)
void	pspFpuClearCondbits (uint32_t clear)
	Clear the condition bits.
float	pspFpuAbs (float f)
	returns absolute value
int	pspFpuCeil (float f)
	Round up.
int	pspFpuFloor (float f)
	Truncate.
float	pspFpuMax (float f1, float f2)
	select maximum value
float	pspFpuMin (float f1, float f2)
	select minimum value
float	pspFpuNeg (float f)
	Sign reversal.
int	pspFpuRound (float f)
	Round to nearest.
float	pspFpuRsqrt (float f)
float	pspFpuSqrt (float f)
	Square root.
int	pspFpuTrunc (float f)
	Round towards zero.
float	pspFpuFmod (float fs, float fd)
float	pspFpuFrac (float f)
float	pspFpuReinterpretFloat (uint32_t ui)
uint32_t	pspFpuReinterpretUint (float f)
int	pspFpuIsEqual (float f1, float f2)
float	pspFpuSignFloat (float f)
int	pspFpuSignInt (float f)
float	pspFpuPositiveZero (void)
	Positive zero.
float	pspFpuNegativeZero (void)
	Negative zero.
int	pspFpuIsZero (float f)
	Test for zero value.
int	pspFpuIsPositiveZero (float f)
	Test for positive zero.
int	pspFpuIsNegativeZero (float f)
	Test for negative zero.
int	pspFpuIsDenormal (float f)
	Test for denormalized number.
int	pspFpuIsZeroOrDenormal (float f)
	Test for zero or denormalized number.
float	pspFpuPositiveInf (void)
	Positive infinity.
float	pspFpuNegativeInf (void)
	Negative infinity.
int	pspFpuIsInf (float f)
	Test for infinity.
float	pspFpuPositiveNaN (void)
	NaN (positive SNaN)
float	pspFpuNegativeNaN (void)
	NaN (negative SNaN)
float	pspFpuPositiveQNaN (void)
	Quiet NaN (positive QNaN)
float	pspFpuNegativeQNaN (void)
	Quiet NaN (positive QNaN)
float	pspFpuPositiveSNaN (unsigned int uiSignal)
	Signaling NaN (positive SNaN)
float	pspFpuNegativeSNaN (unsigned int uiSignal)
	Signaling NaN (negative SNaN)
int	pspFpuIsNaN (float f)
	Test for NaN.
int	pspFpuIsInfOrNaN (float f)
	Test for infinity or NaN.
float	pspFpuNormalizePhase (float f)
float	pspFpuSin (float x)
	Sine.
float	pspFpuCos (float x)
	Cosine.
float	pspFpuAtan (float x)
	Arc tangent.
float	pspFpuLog (float x)
	Natural Logarithm.
float	pspFpuExp (float x)
	Exponential.
float	pspFpuAsin (float x)
	ArcSin.
float	pspFpuAcos (float x)
	ArcCos.
double	pspFpuFloatToDouble (float a)
	convert float to double
float	pspFpuDoubleToFloat (double a)
	convert double to float

Macro Definition Documentation

PSP_FPU_CAUSE_MASK

#define PSP_FPU_CAUSE_MASK   (0x3F << PSP_FPU_CAUSE_POS)

PSP_FPU_CAUSE_POS

#define PSP_FPU_CAUSE_POS   12

Bit position of the cause bits.

PSP_FPU_CC0_MASK

#define PSP_FPU_CC0_MASK   (1 << PSP_FPU_CC0_POS)

PSP_FPU_CC0_POS

#define PSP_FPU_CC0_POS   23

Bit position of the cc0 bit.

PSP_FPU_CC17_MASK

#define PSP_FPU_CC17_MASK   (0x7F << PSP_FPU_CC17_POS)

PSP_FPU_CC17_POS

#define PSP_FPU_CC17_POS   25

Bit position of the cc1->7 bits.

PSP_FPU_ENABLE_MASK

#define PSP_FPU_ENABLE_MASK   (0x1F << PSP_FPU_ENABLE_POS)

PSP_FPU_ENABLE_POS

#define PSP_FPU_ENABLE_POS   7

Bit position of the enable bits.

PSP_FPU_FLAGS_MASK

#define PSP_FPU_FLAGS_MASK   (0x1F << PSP_FPU_FLAGS_POS)

PSP_FPU_FLAGS_POS

#define PSP_FPU_FLAGS_POS   2

Bit position of the flag bits.

PSP_FPU_FS_MASK

#define PSP_FPU_FS_MASK   (1 << PSP_FPU_FS_POS)

PSP_FPU_FS_POS

#define PSP_FPU_FS_POS   24

Bit position of the fs bit.

PSP_FPU_RM_MASK

#define PSP_FPU_RM_MASK   0x03

Mask value for rounding mode.

Enumeration Type Documentation

PspFpuExceptions

enum PspFpuExceptions

Enumeration for FPU exceptions.

Enumerator
PSP_FPU_EXCEPTION_INEXACT	Inexact operation exception.
PSP_FPU_EXCEPTION_UNDERFLOW	Underflow exception.
PSP_FPU_EXCEPTION_OVERFLOW	Overflow exception.
PSP_FPU_EXCEPTION_DIVBYZERO	Division by zero exception.
PSP_FPU_EXCEPTION_INVALIDOP	Invalid operation exception.
PSP_FPU_EXCEPTION_UNIMPOP	Unimplemented operation exception (only supported in the cause bits)
PSP_FPU_EXCEPTION_ALL	All exceptions.

PspFpuRoundMode

enum PspFpuRoundMode

Enumeration for FPU rounding modes.

Enumerator
PSP_FPU_RN	Round to nearest representable value.
PSP_FPU_RZ	Round towards zero.
PSP_FPU_RP	Round towards plus infinity.
PSP_FPU_RM	Round towards minus infinity.

Function Documentation

pspFpuAbs()

float pspFpuAbs

(

float

f

)

returns absolute value

References x.

pspFpuAcos()

float pspFpuAcos

(

float

x

)

ArcCos.

References pspFpuAtan(), and x.

pspFpuAsin()

float pspFpuAsin

(

float

x

)

ArcSin.

References pspFpuAtan(), and x.

pspFpuAtan()

float pspFpuAtan

(

float

x

)

Arc tangent.

References PSP_MATH_PI, and x.

Referenced by pspFpuAcos(), and pspFpuAsin().

pspFpuCeil()

int pspFpuCeil

(

float

f

)

Round up.

References x.

pspFpuClearCause()

void pspFpuClearCause

(

uint32_t

clear

)

Clear the cause bits.

Parameters

clear

- Bitmask of the bits to clear, one or more of PspFpuExceptions

References PSP_FPU_CAUSE_POS, pspFpuGetFCR31(), pspFpuSetFCR31(), and x.

pspFpuClearCondbits()

void pspFpuClearCondbits

(

uint32_t

clear

)

Clear the condition bits.

Parameters

clear

- Bitmask of the bits to clear

References PSP_FPU_CC0_POS, PSP_FPU_CC17_POS, pspFpuGetFCR31(), pspFpuSetFCR31(), and x.

pspFpuClearFlags()

void pspFpuClearFlags

(

uint32_t

clear

)

Clear the flags bits.

Parameters

clear

- Bitmask of the bits to clear, one or more of PspFpuExceptions

References PSP_FPU_FLAGS_POS, pspFpuGetFCR31(), pspFpuSetFCR31(), and x.

pspFpuCos()

float pspFpuCos

(

float

x

)

Cosine.

References COS_SIN_DIV, PSP_MATH_PI, x, and y.

pspFpuDoubleToFloat()

float pspFpuDoubleToFloat

(

double

a

)

convert double to float

pspFpuExp()

float pspFpuExp

(

float

x

)

Exponential.

References f, i, PSP_MATH_LN2, PSP_MATH_LOG2E, x, and z.

pspFpuFloatToDouble()

double pspFpuFloatToDouble

(

float

a

)

convert float to double

pspFpuFloor()

int pspFpuFloor

(

float

f

)

Truncate.

References x.

pspFpuFmod()

float pspFpuFmod	(	float	fs,
		float	fd
	)

References x.

pspFpuFrac()

float pspFpuFrac

(

float

f

)

References x.

pspFpuGetCause()

uint32_t pspFpuGetCause

(

void

)

Get the cause bits (only useful if you installed your own exception handler)

Returns

Bitmask of flags, zero or more of PspFpuExceptions

References PSP_FPU_CAUSE_MASK, PSP_FPU_CAUSE_POS, pspFpuGetFCR31(), and x.

pspFpuGetCondbits()

uint32_t pspFpuGetCondbits

(

void

)

Get the condition flags (8 bits)

Returns

The current condition flags

References PSP_FPU_CC0_MASK, PSP_FPU_CC0_POS, PSP_FPU_CC17_MASK, PSP_FPU_CC17_POS, pspFpuGetFCR31(), and x.

pspFpuGetEnable()

uint32_t pspFpuGetEnable

(

void

)

Get the exception enable flags.

Returns

Bitmask of the flags, zero or more of PspFpuExceptions

References PSP_FPU_ENABLE_MASK, PSP_FPU_ENABLE_POS, pspFpuGetFCR31(), and x.

pspFpuGetFCR31()

uint32_t pspFpuGetFCR31

(

void

)

Get the current value of the control/status register.

Returns

The value of the control/status register

References x.

Referenced by pspFpuClearCause(), pspFpuClearCondbits(), pspFpuClearFlags(), pspFpuGetCause(), pspFpuGetCondbits(), pspFpuGetEnable(), pspFpuGetFlags(), pspFpuGetFS(), pspFpuGetRoundmode(), pspFpuSetEnable(), pspFpuSetFS(), and pspFpuSetRoundmode().

pspFpuGetFlags()

uint32_t pspFpuGetFlags

(

void

)

Get the exception flags (set when an exception occurs but the actual exception bit is not enabled)

Returns

Bitmask of the flags, zero or more of PspFpuExceptions

References PSP_FPU_FLAGS_MASK, PSP_FPU_FLAGS_POS, pspFpuGetFCR31(), and x.

pspFpuGetFS()

uint32_t pspFpuGetFS

(

void

)

Get the current value of the FS bit (if FS is 0 then an exception occurs with denormalized values, if 1 then they are rewritten as 0.

Returns

The current state of the FS bit (0 or 1)

References PSP_FPU_FS_MASK, PSP_FPU_FS_POS, pspFpuGetFCR31(), and x.

pspFpuGetRoundmode()

enum PspFpuRoundMode pspFpuGetRoundmode

(

void

)

Get the current round mode.

Returns

The round mode, one of PspFpuRoundMode

References PSP_FPU_RM_MASK, and pspFpuGetFCR31().

pspFpuIsDenormal()

int pspFpuIsDenormal

(

float

f

)

Test for denormalized number.

References f.

pspFpuIsEqual()

int pspFpuIsEqual	(	float	f1,
		float	f2
	)

References x.

pspFpuIsInf()

int pspFpuIsInf

(

float

f

)

Test for infinity.

References f.

pspFpuIsInfOrNaN()

int pspFpuIsInfOrNaN

(

float

f

)

Test for infinity or NaN.

References f.

pspFpuIsNaN()

int pspFpuIsNaN

(

float

f

)

Test for NaN.

References f.

pspFpuIsNegativeZero()

int pspFpuIsNegativeZero

(

float

f

)

Test for negative zero.

References f.

pspFpuIsPositiveZero()

int pspFpuIsPositiveZero

(

float

f

)

Test for positive zero.

References f.

pspFpuIsZero()

int pspFpuIsZero

(

float

f

)

Test for zero value.

References f.

pspFpuIsZeroOrDenormal()

int pspFpuIsZeroOrDenormal

(

float

f

)

Test for zero or denormalized number.

References f.

pspFpuLog()

float pspFpuLog

(

float

x

)

Natural Logarithm.

References a, b, f, i, x, y, and z.

pspFpuMax()

float pspFpuMax	(	float	f1,
		float	f2
	)

select maximum value

References x.

pspFpuMin()

float pspFpuMin	(	float	f1,
		float	f2
	)

select minimum value

References x.

pspFpuNeg()

float pspFpuNeg

(

float

f

)

Sign reversal.

References x.

pspFpuNegativeInf()

float pspFpuNegativeInf

(

void

)

Negative infinity.

pspFpuNegativeNaN()

float pspFpuNegativeNaN

(

void

)

NaN (negative SNaN)

pspFpuNegativeQNaN()

float pspFpuNegativeQNaN

(

void

)

Quiet NaN (positive QNaN)

pspFpuNegativeSNaN()

float pspFpuNegativeSNaN

(

unsigned int

uiSignal

)

Signaling NaN (negative SNaN)

References x.

pspFpuNegativeZero()

float pspFpuNegativeZero

(

void

)

Negative zero.

pspFpuNormalizePhase()

float pspFpuNormalizePhase

(

float

f

)

References PSP_MATH_TWOPI, and x.

pspFpuPositiveInf()

float pspFpuPositiveInf

(

void

)

Positive infinity.

pspFpuPositiveNaN()

float pspFpuPositiveNaN

(

void

)

NaN (positive SNaN)

pspFpuPositiveQNaN()

float pspFpuPositiveQNaN

(

void

)

Quiet NaN (positive QNaN)

pspFpuPositiveSNaN()

float pspFpuPositiveSNaN

(

unsigned int

uiSignal

)

Signaling NaN (positive SNaN)

References x.

pspFpuPositiveZero()

float pspFpuPositiveZero

(

void

)

Positive zero.

pspFpuReinterpretFloat()

float pspFpuReinterpretFloat

(

uint32_t

ui

)

References ui.

pspFpuReinterpretUint()

uint32_t pspFpuReinterpretUint

(

float

f

)

References x.

pspFpuRound()

int pspFpuRound

(

float

f

)

Round to nearest.

References x.

pspFpuRsqrt()

float pspFpuRsqrt

(

float

f

)

References x.

pspFpuSetEnable()

void pspFpuSetEnable

(

uint32_t

enable

)

Set the enable flags bits.

Parameters

enable

- Bitmask of exceptions to enable, zero or more of PspFpuExceptions

References PSP_FPU_ENABLE_POS, pspFpuGetFCR31(), pspFpuSetFCR31(), and x.

pspFpuSetFCR31()

void pspFpuSetFCR31

(

uint32_t

var

)

Set the current value of the control/status register.

Parameters

var	- The value to set.

References x.

Referenced by pspFpuClearCause(), pspFpuClearCondbits(), pspFpuClearFlags(), pspFpuSetEnable(), pspFpuSetFS(), and pspFpuSetRoundmode().

pspFpuSetFS()

void pspFpuSetFS

(

uint32_t

fs

)

Set the FS bit.

Parameters

fs	- 0 or 1 to unset or set fs

References PSP_FPU_FS_POS, pspFpuGetFCR31(), pspFpuSetFCR31(), and x.

pspFpuSetRoundmode()

void pspFpuSetRoundmode

(

enum PspFpuRoundMode

mode

)

Set the current round mode.

Parameters

mode	- The rounding mode to set, one of PspFpuRoundMode

References PSP_FPU_RM_MASK, pspFpuGetFCR31(), pspFpuSetFCR31(), and x.

pspFpuSignFloat()

float pspFpuSignFloat

(

float

f

)

References fv, and x.

pspFpuSignInt()

int pspFpuSignInt

(

float

f

)

References x.

pspFpuSin()

float pspFpuSin

(

float

x

)

Sine.

References COS_SIN_DIV, PSP_MATH_PI, x, and y.

pspFpuSqrt()

float pspFpuSqrt

(

float

f

)

Square root.

References x.

pspFpuTrunc()

int pspFpuTrunc

(

float

f

)

Round towards zero.

References x.