pspfpu.c File Reference

#include "pspfpu.h"

Include dependency graph for pspfpu.c:

Macros
#define	PSP_MATH_PI   3.14159265358979323846
#define	PSP_MATH_TWOPI   (PSP_MATH_PI * 2.0)
#define	PSP_MATH_SQRT2   1.41421356237309504880
#define	PSP_MATH_LN2   0.69314718055994530942
#define	PSP_MATH_LOG2E   1.4426950408889634074
#define	COS_SIN_DIV   0.208

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 fs)
	returns absolute value
int	pspFpuCeil (float fs)
	Round up.
int	pspFpuFloor (float fs)
	Truncate.
float	pspFpuMax (float fs1, float fs2)
	select maximum value
float	pspFpuMin (float fs1, float fs2)
	select minimum value
float	pspFpuNeg (float fs)
	Sign reversal.
int	pspFpuRound (float fs)
	Round to nearest.
float	pspFpuRsqrt (float fs)
float	pspFpuSqrt (float fs)
	Square root.
int	pspFpuTrunc (float fs)
	Round towards zero.
float	pspFpuFmod (float fs, float fd)
float	pspFpuFrac (float fs)
float	pspFpuReinterpretFloat (uint32_t ui)
uint32_t	pspFpuReinterpretUint (float fs)
int	pspFpuIsEqual (float fs1, float fs2)
float	pspFpuSignFloat (float fs)
int	pspFpuSignInt (float fs)
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 fs)
float	pspFpuLog (float x)
	Natural Logarithm.
float	pspFpuExp (float x)
	Exponential.
float	pspFpuSin (float x)
	Sine.
float	pspFpuCos (float x)
	Cosine.
float	pspFpuAtan (float x)
	Arc tangent.
float	pspFpuAsin (float x)
	ArcSin.
float	pspFpuAcos (float x)
	ArcCos.

Macro Definition Documentation

COS_SIN_DIV

#define COS_SIN_DIV   0.208

Referenced by pspFpuCos(), and pspFpuSin().

PSP_MATH_LN2

#define PSP_MATH_LN2   0.69314718055994530942

Referenced by pspFpuExp().

PSP_MATH_LOG2E

#define PSP_MATH_LOG2E   1.4426950408889634074

Referenced by pspFpuExp().

PSP_MATH_PI

#define PSP_MATH_PI   3.14159265358979323846

Referenced by pspFpuAtan(), pspFpuCos(), and pspFpuSin().

PSP_MATH_SQRT2

#define PSP_MATH_SQRT2   1.41421356237309504880

PSP_MATH_TWOPI

#define PSP_MATH_TWOPI   (PSP_MATH_PI * 2.0)

Referenced by pspFpuNormalizePhase().

Function Documentation

pspFpuAbs()

float pspFpuAbs

(

float

fs

)

returns absolute value

pspFpuAcos()

float pspFpuAcos

(

float

x

)

ArcCos.

References pspFpuAtan().

pspFpuAsin()

float pspFpuAsin

(

float

x

)

ArcSin.

References pspFpuAtan().

pspFpuAtan()

float pspFpuAtan

(

float

x

)

Arc tangent.

References PSP_MATH_PI.

Referenced by pspFpuAcos(), and pspFpuAsin().

pspFpuCeil()

int pspFpuCeil

(

float

fs

)

Round up.

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(), and pspFpuSetFCR31().

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(), and pspFpuSetFCR31().

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(), and pspFpuSetFCR31().

pspFpuCos()

float pspFpuCos

(

float

x

)

Cosine.

References COS_SIN_DIV, and PSP_MATH_PI.

pspFpuExp()

float pspFpuExp

(

float

x

)

Exponential.

References PSP_MATH_LN2, and PSP_MATH_LOG2E.

pspFpuFloor()

int pspFpuFloor

(

float

fs

)

Truncate.

pspFpuFmod()

float pspFpuFmod	(	float	fs,
		float	fd )

pspFpuFrac()

float pspFpuFrac

(

float

fs

)

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, and pspFpuGetFCR31().

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, and pspFpuGetFCR31().

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, and pspFpuGetFCR31().

pspFpuGetFCR31()

uint32_t pspFpuGetFCR31

(

void

)

Get the current value of the control/status register.

Returns

The value of the control/status register

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, and pspFpuGetFCR31().

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, and pspFpuGetFCR31().

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.

pspFpuIsEqual()

int pspFpuIsEqual	(	float	fs1,
		float	fs2 )

pspFpuIsInf()

int pspFpuIsInf

(

float

f

)

Test for infinity.

pspFpuIsInfOrNaN()

int pspFpuIsInfOrNaN

(

float

f

)

Test for infinity or NaN.

pspFpuIsNaN()

int pspFpuIsNaN

(

float

f

)

Test for NaN.

pspFpuIsNegativeZero()

int pspFpuIsNegativeZero

(

float

f

)

Test for negative zero.

pspFpuIsPositiveZero()

int pspFpuIsPositiveZero

(

float

f

)

Test for positive zero.

pspFpuIsZero()

int pspFpuIsZero

(

float

f

)

Test for zero value.

pspFpuIsZeroOrDenormal()

int pspFpuIsZeroOrDenormal

(

float

f

)

Test for zero or denormalized number.

pspFpuLog()

float pspFpuLog

(

float

x

)

Natural Logarithm.

pspFpuMax()

float pspFpuMax	(	float	fs1,
		float	fs2 )

select maximum value

pspFpuMin()

float pspFpuMin	(	float	fs1,
		float	fs2 )

select minimum value

pspFpuNeg()

float pspFpuNeg

(

float

fs

)

Sign reversal.

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)

pspFpuNegativeZero()

float pspFpuNegativeZero

(

void

)

Negative zero.

pspFpuNormalizePhase()

float pspFpuNormalizePhase

(

float

fs

)

References PSP_MATH_TWOPI.

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)

pspFpuPositiveZero()

float pspFpuPositiveZero

(

void

)

Positive zero.

pspFpuReinterpretFloat()

float pspFpuReinterpretFloat

(

uint32_t

ui

)

pspFpuReinterpretUint()

uint32_t pspFpuReinterpretUint

(

float

fs

)

pspFpuRound()

int pspFpuRound

(

float

fs

)

Round to nearest.

pspFpuRsqrt()

float pspFpuRsqrt

(

float

fs

)

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(), and pspFpuSetFCR31().

pspFpuSetFCR31()

void pspFpuSetFCR31

(

uint32_t

var

)

Set the current value of the control/status register.

Parameters

var	- The value to set.

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(), and pspFpuSetFCR31().

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(), and pspFpuSetFCR31().

pspFpuSignFloat()

float pspFpuSignFloat

(

float

fs

)

pspFpuSignInt()

int pspFpuSignInt

(

float

fs

)

pspFpuSin()

float pspFpuSin

(

float

x

)

Sine.

References COS_SIN_DIV, and PSP_MATH_PI.

pspFpuSqrt()

float pspFpuSqrt

(

float

fs

)

Square root.

pspFpuTrunc()

int pspFpuTrunc

(

float

fs

)

Round towards zero.