Class MixedRadixFactor4

java.lang.Object

ffx.numerics.fft.MixedRadixFactor

ffx.numerics.fft.MixedRadixFactor4

public class MixedRadixFactor4
extends MixedRadixFactor

The MixedRadixFactor4 class handles factors of 4 in the FFT.

Field Summary

Fields inherited from class MixedRadixFactor

BLOCK_LOOP, BLOCK_LOOP_128, BLOCK_LOOP_256, BLOCK_LOOP_512, di, dj, DOUBLE_SPECIES, factor, ii, im, innerLoopLimit, INTERLEAVED_LOOP, INTERLEAVED_LOOP_128, INTERLEAVED_LOOP_256, INTERLEAVED_LOOP_512, jstep, LENGTH, LENGTH_128, LENGTH_256, LENGTH_512, n, NEGATE_IM, NEGATE_IM_128, NEGATE_IM_256, NEGATE_IM_512, NEGATE_RE, NEGATE_RE_128, NEGATE_RE_256, NEGATE_RE_512, nextInput, nFFTs, outerLoopLimit, product, SHUFFLE_RE_IM, SHUFFLE_RE_IM_128, SHUFFLE_RE_IM_256, SHUFFLE_RE_IM_512, simdWidth, twiddles, wi, wr

Constructor Summary

Constructors

Constructor	Description
MixedRadixFactor4(PassConstants passConstants)	Construct a MixedRadixFactor4.

Method Summary

Modifier and Type	Method	Description
int	getOptimalSIMDWidth()	Determine the optimal SIMD width.
boolean	isValidSIMDWidth(int width)	Check if the requested SIMD length is valid.
protected void	passScalar(PassData passData)	Handle factors of 4.
protected void	passSIMD(PassData passData)	Handle factors of 4 using SIMD vectors.

Methods inherited from class MixedRadixFactor

multiplyAndStore, setSIMDWidth, toString

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

MixedRadixFactor4

public MixedRadixFactor4(PassConstants passConstants)

Construct a MixedRadixFactor4.

Parameters:

passConstants - PassConstants.

Method Details

isValidSIMDWidth

public boolean isValidSIMDWidth(int width)

Check if the requested SIMD length is valid.

Overrides:

isValidSIMDWidth in class MixedRadixFactor

Parameters:

width - Requested SIMD species width.

Returns:

True if this width is supported.

getOptimalSIMDWidth

public int getOptimalSIMDWidth()

Determine the optimal SIMD width. Currently supported widths are 2, 4 and 8. If no SIMD width is valid, return 0 to indicate use of the scalar path.

Overrides:

getOptimalSIMDWidth in class MixedRadixFactor

Returns:

The optimal SIMD width.

passScalar

protected void passScalar(PassData passData)

Handle factors of 4.

Specified by:

passScalar in class MixedRadixFactor

Parameters:

passData - the pass data.

passSIMD

protected void passSIMD(PassData passData)

Handle factors of 4 using SIMD vectors.

Specified by:

passSIMD in class MixedRadixFactor

Parameters:

passData - The pass data.