cfft_simd.h

在ADSP-2126x上编写的优化过的FFT程序（用c和汇编编写）。

/*******************************************************************************
*
* Header File:  cfft_simd.h 
*
* Synopsis:  #include "cfft_simd.h"
*            
*
*
* Author:	Darrel Judd
*				Judd Labs, Inc.
*				801-756-2057
*				[e-mail]
*
* Revisions:
*				Created June, 2003 - Darrel Judd
************************************************************************************/
// C definitions
#include "ctypes.h"
// Storage object used by cfft_simd_init, cfft_simd_twiddle_calc, and cfft_simd
typedef struct {
	float *real_input;
	float *imag_input;
	float *real_fft;
	float *imag_fft;
	float *real_fftp8;
	float *imag_fftp8;
	float *real_fftpN4;
	float *imag_fftpN4;
	float *real_inputpN2;
	float *imag_inputpN2;
	float *twid_real;
	float *twid_imag;
	U32 IREDM;
	U32 BRMODIFY;
	U32 IREPM;
	U32 N;
	U32 N2;
	U32 N4;
	S32 mN4;
	U32 N8;
	U32 N2p2;
	S32 mN2;
	U32 N4m1;
	U32 STAGESm5;
	
}Tcfft_simd;
// allowed fft sizes for cfft_simd
typedef enum{
				N64=64,
				N128=128,
				N256=256,
				N512=512,
				N1024=1024,
				N2048=2048,
				N4096=4096,
				N8192=8192,
				N16384=16384}Tcfft_simd_size;
// proto-types
void cfft_simd_init(Tcfft_simd pm *pfft,	// pointer to fft object
						  Tcfft_simd_size N,	// size of fft, must be a power of 2
						  float *reinput,		// pointer to real input data of size N
						  float pm *imimput,	// pointer to imag input data of size N
						  float *retwid,		// pointer to real twiddle array of size N/2
						  float pm *imtwid,	// pointer to imag twiddle array of size N/2
						  float *refft,		// pointer to real temp array of size N
						  float pm *imfft);	// pointer to imag temp array of size N
						  
void cfft_simd_twiddle_calc(Tcfft_simd pm *pfft);	// pointer to fft object

void cfft_simd(Tcfft_simd pm *pfft);	// pointer to fft object