iLab Neuromorphic Vision Toolkit

 {
  1.0,
  4503599627370496.0,
  6.93147180369123816490e-01,        
  1.90821492927058770002e-10,        
 -6.88821452420390473170286327331268694251775741577e-0002,
  1.97493380704769294631262255279580131173133850098e+0000,
  2.24963218866067560242072431719861924648284912109e+0000,
 -9.02975906958474405783476868236903101205825805664e-0001,
 -1.47391630715542865104339398385491222143173217773e+0000,
  1.86846544648220058704168877738993614912033081055e+0000,
  1.82277370459347465292410106485476717352867126465e+0000,
  1.25295479915214102994980294170090928673744201660e+0000,
  1.96709676945198275177517643896862864494323730469e+0000,
 -4.00127989749189894030934055990655906498432159424e-0001,
  3.01675528558798333733648178167641162872314453125e+0000,
 -9.52325445049240770778453679668018594384193420410e-0001,
 -1.25041641589283658575482149899471551179885864258e-0001,
  1.87161713283355151891381127914642725337613123482e+0000,
 -1.89082956295731507978530316904652863740921020508e+0000,
 -2.50562891673640253387134180229622870683670043945e+0000,
  1.64822828085258366037635369139024987816810607910e+0000,
 -1.24409107065868340669112512841820716857910156250e+0000,
  1.70534231658220414296067701798165217041969299316e+0000,
  1.99196833784655646937267192697618156671524047852e+0000,
}


Fast Square Root Methods
These are several methods for computing a quick square root approximation. The order is by decreasing speed / increasing accuracy Name : opperation time relative to sqrt() fastSqrt_2 : 1/5 fastSqrt_Bab : 1/2 fastSqrt_Q3 : 2/3 fastSqrt_Bab_2 : 2/3 Details: fastSqrt_2 - This is a simple log base 2 approximation using a union to int and an 4 simple arith operations. fastSqrt_Bab - This is the fastSqrt_2 with a Babylonian step added to give it a quadratic improvement. fastSqrt_Q3 - This uses the Quake 3 InvRoot function with a quick estimation and a single Newton step. This will call invSqrt listed below. fastSqrt_Bab_2 - This is the fastSqrt_Bab with two Babylonian Steps instead of just one.
#define	SQRT_MAGIC_F 0x5f3759df
#define	SQRT_MAGIC_D 0x5fe6ec85e7de30da
#define	KIMS_CONST_F 0x4C000
#define	KIMS_CONST_D (KIMS_CONST_F << 29)
float	fastSqrt_2 (const float x)
	Fast and dirty Log Base 2 appoximiation for square root.
double	fastSqrt_2 (const double x)
	Fast and dirty Log Base 2 appoximiation for square root.
float	fastSqrt_Bab (const float x)
	Fast and dirty Log Base 2 appoximiation with a Babylonian Step Clean up.
double	fastSqrt_Bab (const double x)
	Fast and dirty Log Base 2 appoximiation with a Babylonian Step Clean up.
float	invSqrt (const float x)
	Quake 3 Fast Square Root Approximation.
float	fastSqrt_Q3 (const float x)
	Fast Square Root Approximation.
double	invSqrt (const double x)
	Quake 3 Fast Square Root Approximation.
double	fastSqrt_Q3 (const double x)
	Fast Square Root Approximation.
float	fastSqrt_Bab_2 (const float x)
	Fast and dirty Log Base 2 appoximiation with two Babylonian Steps.
double	fastSqrt_Bab_2 (const double x)
	Fast and dirty Log Base 2 appoximiation with two Babylonian Steps.
char	fastSqrt (const char x)
	This just creates a default function call.
int	fastSqrt (const int x)
	This just creates a default function call.
float	fastSqrt (const float x)
	This just creates a default function call.
double	fastSqrt (const double x)
	This just creates a default function call.
#define	ONE TBL_LOG_P[0]
#define	TWO52 TBL_LOG_P[1]
#define	LN2HI TBL_LOG_P[2]
#define	LN2LO TBL_LOG_P[3]
#define	A1 TBL_LOG_P[4]
#define	A2 TBL_LOG_P[5]
#define	A3 TBL_LOG_P[6]
#define	A4 TBL_LOG_P[7]
#define	A5 TBL_LOG_P[8]
#define	A6 TBL_LOG_P[9]
#define	A7 TBL_LOG_P[10]
#define	A8 TBL_LOG_P[11]
#define	A9 TBL_LOG_P[12]
#define	A10 TBL_LOG_P[13]
#define	A11 TBL_LOG_P[14]
#define	A12 TBL_LOG_P[15]
#define	B1 TBL_LOG_P[16]
#define	B2 TBL_LOG_P[17]
#define	B3 TBL_LOG_P[18]
#define	B4 TBL_LOG_P[19]
#define	B5 TBL_LOG_P[20]
#define	B6 TBL_LOG_P[21]
#define	B7 TBL_LOG_P[22]
#define	B8 TBL_LOG_P[23]
#define	HIWORD 1
#define	LOWORD 0
double	fastLog (const double x)
	Fast Log - Stripped version of libm's Log(x).
static const double	TBL_LOG_P []
static const double	_TBL_log []

FastMathFunctions.H File Reference

Detailed Description

Fast Square Root Methods

Function Documentation

Variable Documentation