virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-23 12:43:46 +02:00
Code Issues Releases Activity

clean up FFT SIMD selection

Browse Source 
Originally committed as revision 12477 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Måns Rullgård 2008-03-17 19:22:28 +00:00
parent 53620bba51
commit 844ea46aeb
1 changed files with 28 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

55
libavcodec/fft.c
View File

@ -34,6 +34,8 @@ int ff_fft_init(FFTContext *s, int nbits, int inverse)
{
int i, j, m, n;
float alpha, c1, s1, s2;
int shuffle = 0;
int av_unused has_vectors;
s->nbits = nbits;
n = 1 << nbits;
@ -59,32 +61,33 @@ int ff_fft_init(FFTContext *s, int nbits, int inverse)
s->imdct_calc = ff_imdct_calc;
s->exptab1 = NULL;
/* compute constant table for HAVE_SSE version */
#if defined(HAVE_MMX) \
|| (defined(HAVE_ALTIVEC) && !defined(ALTIVEC_USE_REFERENCE_C_CODE))
{
int has_vectors = mm_support();
if (has_vectors) {
#if defined(HAVE_MMX)
if (has_vectors & MM_3DNOWEXT) {
/* 3DNowEx for K7/K8 */
s->imdct_calc = ff_imdct_calc_3dn2;
s->fft_calc = ff_fft_calc_3dn2;
} else if (has_vectors & MM_3DNOW) {
/* 3DNow! for K6-2/3 */
s->fft_calc = ff_fft_calc_3dn;
} else if (has_vectors & MM_SSE) {
/* SSE for P3/P4 */
s->imdct_calc = ff_imdct_calc_sse;
s->fft_calc = ff_fft_calc_sse;
}
#else /* HAVE_MMX */
if (has_vectors & MM_ALTIVEC)
s->fft_calc = ff_fft_calc_altivec;
#ifdef HAVE_MMX
has_vectors = mm_support();
shuffle = 1;
if (has_vectors & MM_3DNOWEXT) {
/* 3DNowEx for K7/K8 */
s->imdct_calc = ff_imdct_calc_3dn2;
s->fft_calc = ff_fft_calc_3dn2;
} else if (has_vectors & MM_3DNOW) {
/* 3DNow! for K6-2/3 */
s->fft_calc = ff_fft_calc_3dn;
} else if (has_vectors & MM_SSE) {
/* SSE for P3/P4 */
s->imdct_calc = ff_imdct_calc_sse;
s->fft_calc = ff_fft_calc_sse;
} else {
shuffle = 0;
}
#elif defined HAVE_ALTIVEC && !defined ALTIVEC_USE_REFERENCE_C_CODE
has_vectors = mm_support();
if (has_vectors & MM_ALTIVEC) {
s->fft_calc = ff_fft_calc_altivec;
shuffle = 1;
}
#endif
}
if (s->fft_calc != ff_fft_calc_c) {
/* compute constant table for HAVE_SSE version */
if (shuffle) {
int np, nblocks, np2, l;
FFTComplex *q;
@ -111,8 +114,6 @@ int ff_fft_init(FFTContext *s, int nbits, int inverse)
} while (nblocks != 0);
av_freep(&s->exptab);
}
}
#endif
/* compute bit reverse table */