hvirtual/quicktime/ffmpeg/libavcodec/ppc/fft_altivec.c File Reference

#include "../dsputil.h"
#include "gcc_fixes.h"
#include "dsputil_altivec.h"

Include dependency graph for fft_altivec.c:

Go to the source code of this file.

Defines
#define	BF(pre, pim, qre, qim, pre1, pim1, qre1, qim1)
#define	MUL16(a, b)   ((a) * (b))
#define	CMUL(pre, pim, are, aim, bre, bim)
Functions
void	ff_fft_calc_altivec (FFTContext *s, FFTComplex *z)

---

Define Documentation

#define BF	(	pre,
		pim,
		qre,
		qim,
		pre1,
		pim1,
		qre1,
		qim1		)

Value:

{\
  FFTSample ax, ay, bx, by;\
  bx=pre1;\
  by=pim1;\
  ax=qre1;\
  ay=qim1;\
  pre = (bx + ax);\
  pim = (by + ay);\
  qre = (bx - ax);\
  qim = (by - ay);\
}

Definition at line 32 of file fft_altivec.c.

#define CMUL	(	pre,
		pim,
		are,
		aim,
		bre,
		bim		)

Value:

{\
   pre = (MUL16(are, bre) - MUL16(aim, bim));\
   pim = (MUL16(are, bim) + MUL16(bre, aim));\
}

Definition at line 45 of file fft_altivec.c.

#define MUL16	(	a,
		b		)	((a) * (b))

Definition at line 44 of file fft_altivec.c.

---

Function Documentation

void ff_fft_calc_altivec	(	FFTContext *	s,
		FFTComplex *	z
	)

Do a complex FFT with the parameters defined in ff_fft_init(). The input data must be permuted before with s->revtab table. No 1.0/sqrt(n) normalization is done. AltiVec-enabled This code assumes that the 'z' pointer is 16 bytes-aligned It also assumes all FFTComplex are 8 bytes-aligned pair of float The code is exactly the same as the SSE version, except that successive MUL + ADD/SUB have been merged into fused multiply-add ('vec_madd' in altivec)

Definition at line 63 of file fft_altivec.c.

References a, a1, b, BF, c, c1, c2, CMUL, FFTContext::exptab, exptab, FFTContext::exptab1, FFTComplex::im, FFTContext::inverse, FFTContext::nbits, POWERPC_PERF_DECLARE, POWERPC_PERF_START_COUNT, POWERPC_PERF_STOP_COUNT, r, FFTComplex::re, and t1.

Referenced by ff_fft_init().