vsip_ddfftop_p - Perform FFT Operations (Out-of-Place)

Core

This manual is preliminary and incomplete.
While our Core implementation implements all functions given in the standard we are still working on completing this documentation.

Please refer to the VSIPL standard for a complete function reference of the Core profile until we have completed work on this documentation.

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5.1.5 vsip_ddfftop_p - Perform FFT Operations (Out-of-Place)

void vsip_ccfftop_f(const vsip_fft_f *fft, const vsip_cvview_f *x, const vsip_cvview_f *y); 
void vsip_rcfftop_f(const vsip_fft_f *fft, const vsip_vview_f *x, const vsip_cvview_f *y); 
void vsip_crfftop_f(const vsip_fft_f *fft, const vsip_cvview_f *x, const vsip_vview_f *y);

Description

These functions perform FFT (Fast Fourier Transform) operations using the specified FFT object. Each function handles a different type of FFT:

vsip_ccfftop_p : Performs a out-of-place complex-to-complex FFT.
vsip_rcfftop_p : Performs a out-of-place real-to-complex FFT.
vsip_crfftop_p : Performs a out-of-place complex-to-real FFT.

The performance for supported FFT sizes is standardized as $O(nlogn)$ . For sizes not directly supported by the FFT kernels a DFT fallback with a performance of $O(n2)$ is standardized.

Parameters

const vsip_fft_p* fft: Pointer to the FFT object.
const vsip_dvview_p* x: Pointer to the input complex vector view
const vsip_dvview_p* y: Pointer to the output complex vector view

Example

vsip_fft_f *fft_cc; 
vsip_fft_f *fft_rc; 
vsip_fft_f *fft_cr; 
vsip_cvview_f *complex_input; 
vsip_cvview_f *complex_output; 
vsip_vview_f *real_input; 
vsip_vview_f *real_output; 
 
// Assuming fft_cc, fft_rc, fft_cr, complex_input, complex_output, real_input, and real_output have been properly initialized 
 
// Perform complex-to-complex FFT 
vsip_ccfftop_f(fft_cc, complex_input, complex_output);

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