Header SinCosLUT.h

Detailed Description

fast non-vector FPU version of SinCos used in various CW codes

Authors

Reinhard Prix, Karl Wette

Prototypes
void	XLALSinCosLUTInit (void)
int	XLALSinCosLUT (REAL4 *sinx, REAL4 *cosx, REAL8 x)
	Calculate sin(x) and cos(x) to roughly 1e-7 precision using a lookup-table and Taylor-expansion. More...
int	XLALSinCos2PiLUT (REAL4 *sin2pix, REAL4 *cos2pix, REAL8 x)
	Calculate sin(2*pi*x) and cos(2*pi*x) to roughly 1e-7 precision using a lookup-table and Taylor-expansion. More...
int	XLALSinCos2PiLUTtrimmed (REAL4 *s, REAL4 *c, REAL8 x)
	A function that uses the lookup tables to evaluate sin and cos values of 2*Pi*x, but relies on x being already trimmed to the interval [0..2) More...

Function Documentation

XLALSinCosLUTInit()

void XLALSinCosLUTInit

(

void

)

Definition at line 49 of file SinCosLUT.c.

XLALSinCosLUT()

int XLALSinCosLUT	(	REAL4 *	sinx,
		REAL4 *	cosx,
		REAL8	x
	)

Calculate sin(x) and cos(x) to roughly 1e-7 precision using a lookup-table and Taylor-expansion.

Note

This function will fail for arguments larger than |x| > INT4_MAX = 2147483647 ~ 2e9 !!!

Returns XLAL_SUCCESS or XLAL_FAILURE.

Definition at line 83 of file SinCosLUT.c.

XLALSinCos2PiLUT()

int XLALSinCos2PiLUT	(	REAL4 *	sin2pix,
		REAL4 *	cos2pix,
		REAL8	x
	)

Calculate sin(2*pi*x) and cos(2*pi*x) to roughly 1e-7 precision using a lookup-table and Taylor-expansion.

Note

This function will fail for arguments larger than |x| > INT4_MAX = 2147483647 ~ 2e9 !!!

Returns XLAL_SUCCESS or XLAL_FAILURE.

Definition at line 97 of file SinCosLUT.c.

XLALSinCos2PiLUTtrimmed()

int XLALSinCos2PiLUTtrimmed	(	REAL4 *	s,
		REAL4 *	c,
		REAL8	x
	)

A function that uses the lookup tables to evaluate sin and cos values of 2*Pi*x, but relies on x being already trimmed to the interval [0..2)

Definition at line 112 of file SinCosLUT.c.