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mdct15: add assembly optimizations for the 15-point FFT
c: 1802 decicycles in fft15,16774635 runs, 2581 skips avx: 865 decicycles in fft15,16776378 runs, 838 skips Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
This commit is contained in:
Rostislav Pehlivanov
parent
f66086adac
commit
e1120b1c54
@ -57,11 +57,6 @@ av_cold void ff_mdct15_uninit(MDCT15Context **ps)
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av_freep(ps);
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}
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static void mdct15(MDCT15Context *s, float *dst, const float *src, ptrdiff_t stride);
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static void imdct15_half(MDCT15Context *s, float *dst, const float *src,
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ptrdiff_t stride, float scale);
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static inline int init_pfa_reindex_tabs(MDCT15Context *s)
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{
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int i, j;
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@ -93,88 +88,8 @@ static inline int init_pfa_reindex_tabs(MDCT15Context *s)
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return 0;
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}
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av_cold int ff_mdct15_init(MDCT15Context **ps, int inverse, int N, double scale)
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{
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MDCT15Context *s;
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double alpha, theta;
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int len2 = 15 * (1 << N);
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int len = 2 * len2;
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int i;
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/* Tested and verified to work on everything in between */
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if ((N < 2) || (N > 13))
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return AVERROR(EINVAL);
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s = av_mallocz(sizeof(*s));
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if (!s)
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return AVERROR(ENOMEM);
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s->fft_n = N - 1;
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s->len4 = len2 / 2;
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s->len2 = len2;
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s->inverse = inverse;
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s->mdct = mdct15;
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s->imdct_half = imdct15_half;
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if (ff_fft_init(&s->ptwo_fft, N - 1, s->inverse) < 0)
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goto fail;
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if (init_pfa_reindex_tabs(s))
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goto fail;
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s->tmp = av_malloc_array(len, 2 * sizeof(*s->tmp));
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if (!s->tmp)
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goto fail;
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s->twiddle_exptab = av_malloc_array(s->len4, sizeof(*s->twiddle_exptab));
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if (!s->twiddle_exptab)
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goto fail;
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theta = 0.125f + (scale < 0 ? s->len4 : 0);
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scale = sqrt(fabs(scale));
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for (i = 0; i < s->len4; i++) {
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alpha = 2 * M_PI * (i + theta) / len;
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s->twiddle_exptab[i].re = cos(alpha) * scale;
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s->twiddle_exptab[i].im = sin(alpha) * scale;
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}
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/* 15-point FFT exptab */
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for (i = 0; i < 19; i++) {
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if (i < 15) {
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double theta = (2.0f * M_PI * i) / 15.0f;
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if (!s->inverse)
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theta *= -1;
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s->exptab[i].re = cos(theta);
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s->exptab[i].im = sin(theta);
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} else { /* Wrap around to simplify fft15 */
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s->exptab[i] = s->exptab[i - 15];
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}
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}
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/* 5-point FFT exptab */
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s->exptab[19].re = cos(2.0f * M_PI / 5.0f);
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s->exptab[19].im = sin(2.0f * M_PI / 5.0f);
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s->exptab[20].re = cos(1.0f * M_PI / 5.0f);
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s->exptab[20].im = sin(1.0f * M_PI / 5.0f);
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/* Invert the phase for an inverse transform, do nothing for a forward transform */
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if (s->inverse) {
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s->exptab[19].im *= -1;
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s->exptab[20].im *= -1;
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}
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*ps = s;
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return 0;
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fail:
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ff_mdct15_uninit(&s);
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return AVERROR(ENOMEM);
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}
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/* Stride is hardcoded to 3 */
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static inline void fft5(const FFTComplex exptab[2], FFTComplex *out,
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const FFTComplex *in)
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static inline void fft5(FFTComplex *out, FFTComplex *in, FFTComplex exptab[2])
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{
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FFTComplex z0[4], t[6];
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@ -219,14 +134,14 @@ static inline void fft5(const FFTComplex exptab[2], FFTComplex *out,
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out[4].im = in[0].im + z0[3].im;
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}
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static void fft15(const FFTComplex exptab[22], FFTComplex *out, const FFTComplex *in, size_t stride)
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static void fft15_c(FFTComplex *out, FFTComplex *in, FFTComplex *exptab, ptrdiff_t stride)
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{
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int k;
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FFTComplex tmp1[5], tmp2[5], tmp3[5];
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fft5(exptab + 19, tmp1, in + 0);
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fft5(exptab + 19, tmp2, in + 1);
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fft5(exptab + 19, tmp3, in + 2);
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fft5(tmp1, in + 0, exptab + 19);
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fft5(tmp2, in + 1, exptab + 19);
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fft5(tmp3, in + 2, exptab + 19);
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for (k = 0; k < 5; k++) {
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FFTComplex t[2];
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@ -269,7 +184,7 @@ static void mdct15(MDCT15Context *s, float *dst, const float *src, ptrdiff_t str
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}
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CMUL(fft15in[j].re, fft15in[j].im, re, im, s->twiddle_exptab[k].re, -s->twiddle_exptab[k].im);
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}
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fft15(s->exptab, s->tmp + s->ptwo_fft.revtab[i], fft15in, l_ptwo);
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s->fft15(s->tmp + s->ptwo_fft.revtab[i], fft15in, s->exptab, l_ptwo);
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}
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/* Then a 15xN FFT (where N is a power of two) */
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@ -306,7 +221,7 @@ static void imdct15_half(MDCT15Context *s, float *dst, const float *src,
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FFTComplex tmp = { *(in2 - 2*k*stride), *(in1 + 2*k*stride) };
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CMUL3(fft15in[j], tmp, s->twiddle_exptab[k]);
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}
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fft15(s->exptab, s->tmp + s->ptwo_fft.revtab[i], fft15in, l_ptwo);
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s->fft15(s->tmp + s->ptwo_fft.revtab[i], fft15in, s->exptab, l_ptwo);
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}
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/* Then a 15xN FFT (where N is a power of two) */
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@ -327,3 +242,86 @@ static void imdct15_half(MDCT15Context *s, float *dst, const float *src,
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z[i0].im = scale * im1;
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}
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}
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av_cold int ff_mdct15_init(MDCT15Context **ps, int inverse, int N, double scale)
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{
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MDCT15Context *s;
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double alpha, theta;
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int len2 = 15 * (1 << N);
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int len = 2 * len2;
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int i;
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/* Tested and verified to work on everything in between */
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if ((N < 2) || (N > 13))
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return AVERROR(EINVAL);
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s = av_mallocz(sizeof(*s));
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if (!s)
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return AVERROR(ENOMEM);
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s->fft_n = N - 1;
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s->len4 = len2 / 2;
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s->len2 = len2;
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s->inverse = inverse;
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s->fft15 = fft15_c;
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s->mdct = mdct15;
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s->imdct_half = imdct15_half;
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if (ff_fft_init(&s->ptwo_fft, N - 1, s->inverse) < 0)
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goto fail;
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if (init_pfa_reindex_tabs(s))
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goto fail;
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s->tmp = av_malloc_array(len, 2 * sizeof(*s->tmp));
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if (!s->tmp)
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goto fail;
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s->twiddle_exptab = av_malloc_array(s->len4, sizeof(*s->twiddle_exptab));
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if (!s->twiddle_exptab)
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goto fail;
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theta = 0.125f + (scale < 0 ? s->len4 : 0);
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scale = sqrt(fabs(scale));
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for (i = 0; i < s->len4; i++) {
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alpha = 2 * M_PI * (i + theta) / len;
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s->twiddle_exptab[i].re = cosf(alpha) * scale;
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s->twiddle_exptab[i].im = sinf(alpha) * scale;
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}
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/* 15-point FFT exptab */
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for (i = 0; i < 19; i++) {
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if (i < 15) {
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double theta = (2.0f * M_PI * i) / 15.0f;
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if (!s->inverse)
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theta *= -1;
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s->exptab[i].re = cosf(theta);
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s->exptab[i].im = sinf(theta);
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} else { /* Wrap around to simplify fft15 */
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s->exptab[i] = s->exptab[i - 15];
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}
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}
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/* 5-point FFT exptab */
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s->exptab[19].re = cosf(2.0f * M_PI / 5.0f);
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s->exptab[19].im = sinf(2.0f * M_PI / 5.0f);
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s->exptab[20].re = cosf(1.0f * M_PI / 5.0f);
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s->exptab[20].im = sinf(1.0f * M_PI / 5.0f);
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/* Invert the phase for an inverse transform, do nothing for a forward transform */
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if (s->inverse) {
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s->exptab[19].im *= -1;
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s->exptab[20].im *= -1;
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}
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if (ARCH_X86)
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ff_mdct15_init_x86(s);
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*ps = s;
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return 0;
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fail:
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ff_mdct15_uninit(&s);
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return AVERROR(ENOMEM);
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}
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@ -34,34 +34,26 @@ typedef struct MDCT15Context {
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int *pfa_postreindex;
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FFTContext ptwo_fft;
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FFTComplex *tmp;
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FFTComplex *twiddle_exptab;
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/* 0 - 18: fft15 twiddles, 19 - 20: fft5 twiddles */
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FFTComplex exptab[21];
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DECLARE_ALIGNED(32, FFTComplex, exptab)[64];
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/**
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* Calculate a full 2N -> N MDCT
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*/
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/* 15-point FFT */
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void (*fft15)(FFTComplex *out, FFTComplex *in, FFTComplex *exptab, ptrdiff_t stride);
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/* Calculate a full 2N -> N MDCT */
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void (*mdct)(struct MDCT15Context *s, float *dst, const float *src, ptrdiff_t stride);
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/**
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* Calculate the middle half of the iMDCT
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*/
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/* Calculate the middle half of the iMDCT */
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void (*imdct_half)(struct MDCT15Context *s, float *dst, const float *src,
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ptrdiff_t src_stride, float scale);
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} MDCT15Context;
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/**
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* Init an (i)MDCT of the length 2 * 15 * (2^N)
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*/
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/* Init an (i)MDCT of the length 2 * 15 * (2^N) */
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int ff_mdct15_init(MDCT15Context **ps, int inverse, int N, double scale);
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/**
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* Frees a context
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*/
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void ff_mdct15_uninit(MDCT15Context **ps);
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void ff_mdct15_init_x86(MDCT15Context *s);
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#endif /* AVCODEC_MDCT15_H */
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@ -25,6 +25,7 @@ OBJS-$(CONFIG_HUFFYUVDSP) += x86/huffyuvdsp_init.o
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OBJS-$(CONFIG_HUFFYUVENCDSP) += x86/huffyuvencdsp_init.o
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OBJS-$(CONFIG_IDCTDSP) += x86/idctdsp_init.o
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OBJS-$(CONFIG_LPC) += x86/lpc.o
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OBJS-$(CONFIG_MDCT15) += x86/mdct15_init.o
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OBJS-$(CONFIG_ME_CMP) += x86/me_cmp_init.o
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OBJS-$(CONFIG_MPEGAUDIODSP) += x86/mpegaudiodsp.o
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OBJS-$(CONFIG_MPEGVIDEO) += x86/mpegvideo.o \
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@ -117,6 +118,7 @@ X86ASM-OBJS-$(CONFIG_IDCTDSP) += x86/idctdsp.o
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X86ASM-OBJS-$(CONFIG_LLAUDDSP) += x86/lossless_audiodsp.o
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X86ASM-OBJS-$(CONFIG_LLVIDDSP) += x86/lossless_videodsp.o
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X86ASM-OBJS-$(CONFIG_LLVIDENCDSP) += x86/lossless_videoencdsp.o
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X86ASM-OBJS-$(CONFIG_MDCT15) += x86/mdct15.o
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X86ASM-OBJS-$(CONFIG_ME_CMP) += x86/me_cmp.o
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X86ASM-OBJS-$(CONFIG_MPEGAUDIODSP) += x86/imdct36.o
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X86ASM-OBJS-$(CONFIG_MPEGVIDEOENC) += x86/mpegvideoencdsp.o
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141
libavcodec/x86/mdct15.asm
Normal file
141
libavcodec/x86/mdct15.asm
Normal file
@ -0,0 +1,141 @@
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;******************************************************************************
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;* SIMD optimized non-power-of-two MDCT functions
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;*
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;* Copyright (C) 2017 Rostislav Pehlivanov <atomnuker@gmail.com>
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;*
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;* This file is part of FFmpeg.
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;*
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;* FFmpeg is free software; you can redistribute it and/or
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;* modify it under the terms of the GNU Lesser General Public
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;* License as published by the Free Software Foundation; either
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;* version 2.1 of the License, or (at your option) any later version.
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;*
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;* FFmpeg is distributed in the hope that it will be useful,
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;* but WITHOUT ANY WARRANTY; without even the implied warranty of
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;* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;* Lesser General Public License for more details.
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;*
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;* You should have received a copy of the GNU Lesser General Public
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;* License along with FFmpeg; if not, write to the Free Software
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;* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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;******************************************************************************
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%include "libavutil/x86/x86util.asm"
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%if ARCH_X86_64
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SECTION_RODATA
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sign_adjust_5: dd 0x00000000, 0x80000000, 0x80000000, 0x00000000
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SECTION .text
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%macro FFT5 3 ; %1 - in_offset, %2 - dst1 (64bit used), %3 - dst2
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VBROADCASTSD m0, [inq + %1] ; in[ 0].re, in[ 0].im, in[ 0].re, in[ 0].im
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movsd xm1, [inq + 1*16 + 8 + %1] ; in[ 3].re, in[ 3].im, 0, 0
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movsd xm4, [inq + 6*16 + 0 + %1] ; in[12].re, in[12].im, 0, 0
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movhps xm1, [inq + 3*16 + 0 + %1] ; in[ 3].re, in[ 3].im, in[ 6].re, in[ 6].im
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movhps xm4, [inq + 4*16 + 8 + %1] ; in[12].re, in[12].im, in[ 9].re, in[ 9].im
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subps xm2, xm1, xm4 ; t[2].im, t[2].re, t[3].im, t[3].re
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addps xm1, xm4 ; t[0].re, t[0].im, t[1].re, t[1].im
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movhlps %2, xm1 ; t[0].re, t[1].re, t[0].im, t[1].im
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addps %2, xm1
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addps %2, xm0 ; DC[0].re, DC[0].im, junk...
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movlhps %2, %2 ; DC[0].re, DC[0].im, DC[0].re, DC[0].im
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shufps xm3, xm1, xm2, q0110 ; t[0].re, t[0].im, t[2].re, t[2].im
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shufps xm1, xm2, q2332 ; t[1].re, t[1].im, t[3].re, t[3].im
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mulps xm%3, xm1, xm5
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mulps xm4, xm3, xm6
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mulps xm1, xm6
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xorps xm1, xm7
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mulps xm3, xm5
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addsubps xm3, xm1 ; t[0].re, t[0].im, t[2].re, t[2].im
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subps xm%3, xm4 ; t[4].re, t[4].im, t[5].re, t[5].im
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movhlps xm2, xm%3, xm3 ; t[2].re, t[2].im, t[5].re, t[5].im
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movlhps xm3, xm%3 ; t[0].re, t[0].im, t[4].re, t[4].im
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xorps xm2, xm7
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addps xm%3, xm2, xm3
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subps xm3, xm2
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shufps xm3, xm3, q1032
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vinsertf128 m%3, m%3, xm3, 1 ; All ACs (tmp[1] through to tmp[4])
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addps m%3, m0 ; Finally offset with DCs
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%endmacro
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%macro BUTTERFLIES_DC 2 ; %1 - exptab_offset, %2 - out
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mulps xm0, xm9, [exptabq + %1 + 16*0]
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mulps xm1, xm10, [exptabq + %1 + 16*1]
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haddps xm0, xm1
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movhlps xm1, xm0 ; t[0].re, t[1].re, t[0].im, t[1].im
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addps xm0, xm1
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addps xm0, xm8
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movsd [%2q], xm0
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%endmacro
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%macro BUTTERFLIES_AC 2 ; exptab, exptab_offset, src1, src2, src3, out (uses m0-m3)
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mulps m0, m12, [exptabq + 64*0 + 0*mmsize + %1]
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mulps m1, m12, [exptabq + 64*0 + 1*mmsize + %1]
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mulps m2, m13, [exptabq + 64*1 + 0*mmsize + %1]
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mulps m3, m13, [exptabq + 64*1 + 1*mmsize + %1]
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addps m0, m2
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addps m1, m3
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addps m0, m11
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shufps m1, m1, q2301
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addps m0, m1
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vextractf128 xm1, m0, 1
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movlps [%2q + strideq*1], xm0
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movhps [%2q + strideq*2], xm0
|
||||
movlps [%2q + stride3q], xm1
|
||||
movhps [%2q + strideq*4], xm1
|
||||
%endmacro
|
||||
|
||||
;*****************************************************************************************
|
||||
;void ff_fft15_avx(FFTComplex *out, FFTComplex *in, FFTComplex *exptab, ptrdiff_t stride);
|
||||
;*****************************************************************************************
|
||||
INIT_YMM avx
|
||||
cglobal fft15, 4, 6, 14, out, in, exptab, stride, stride3, stride5
|
||||
%define out0q inq
|
||||
shl strideq, 3
|
||||
|
||||
movaps xm5, [exptabq + 480 + 16*0]
|
||||
movaps xm6, [exptabq + 480 + 16*1]
|
||||
movaps xm7, [sign_adjust_5]
|
||||
|
||||
FFT5 0, xm8, 11
|
||||
FFT5 8, xm9, 12
|
||||
FFT5 16, xm10, 13
|
||||
|
||||
lea stride3q, [strideq + strideq*2]
|
||||
lea stride5q, [strideq + strideq*4]
|
||||
|
||||
mov out0q, outq
|
||||
|
||||
BUTTERFLIES_DC (8*6 + 4*0)*2*4, out0
|
||||
lea outq, [out0q + stride5q*1]
|
||||
BUTTERFLIES_DC (8*6 + 4*1)*2*4, out
|
||||
lea outq, [out0q + stride5q*2]
|
||||
BUTTERFLIES_DC (8*6 + 4*2)*2*4, out
|
||||
|
||||
BUTTERFLIES_AC (8*0)*2*4, out0
|
||||
lea outq, [out0q + stride5q*1]
|
||||
BUTTERFLIES_AC (8*2)*2*4, out
|
||||
lea outq, [out0q + stride5q*2]
|
||||
BUTTERFLIES_AC (8*4)*2*4, out
|
||||
|
||||
RET
|
||||
|
||||
%endif
|
||||
95
libavcodec/x86/mdct15_init.c
Normal file
95
libavcodec/x86/mdct15_init.c
Normal file
@ -0,0 +1,95 @@
|
||||
/*
|
||||
* SIMD optimized non-power-of-two MDCT functions
|
||||
*
|
||||
* Copyright (C) 2017 Rostislav Pehlivanov <atomnuker@gmail.com>
|
||||
*
|
||||
* This file is part of FFmpeg.
|
||||
*
|
||||
* FFmpeg is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU Lesser General Public
|
||||
* License as published by the Free Software Foundation; either
|
||||
* version 2.1 of the License, or (at your option) any later version.
|
||||
*
|
||||
* FFmpeg is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
* Lesser General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU Lesser General Public
|
||||
* License along with FFmpeg; if not, write to the Free Software
|
||||
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||||
*/
|
||||
|
||||
#include "config.h"
|
||||
|
||||
#include "libavutil/x86/cpu.h"
|
||||
#include "libavcodec/mdct15.h"
|
||||
|
||||
void ff_fft15_avx(FFTComplex *out, FFTComplex *in, FFTComplex *exptab, ptrdiff_t stride);
|
||||
|
||||
static void perm_twiddles(MDCT15Context *s)
|
||||
{
|
||||
int k;
|
||||
FFTComplex exp_5point[4];
|
||||
|
||||
FFTComplex tmp[21], tmp2[30];
|
||||
memcpy(tmp, s->exptab, sizeof(FFTComplex)*21);
|
||||
|
||||
/* 15-point FFT twiddles */
|
||||
for (k = 0; k < 5; k++) {
|
||||
tmp2[6*k + 0] = tmp[k + 0];
|
||||
tmp2[6*k + 2] = tmp[k + 5];
|
||||
tmp2[6*k + 4] = tmp[k + 10];
|
||||
|
||||
tmp2[6*k + 1] = tmp[2 * (k + 0)];
|
||||
tmp2[6*k + 3] = tmp[2 * (k + 5)];
|
||||
tmp2[6*k + 5] = tmp[2 * k + 5 ];
|
||||
}
|
||||
|
||||
for (k = 0; k < 6; k++) {
|
||||
FFTComplex ac_exp[] = {
|
||||
{ tmp2[6*1 + k].re, tmp2[6*1 + k].re },
|
||||
{ tmp2[6*2 + k].re, tmp2[6*2 + k].re },
|
||||
{ tmp2[6*3 + k].re, tmp2[6*3 + k].re },
|
||||
{ tmp2[6*4 + k].re, tmp2[6*4 + k].re },
|
||||
{ tmp2[6*1 + k].im, -tmp2[6*1 + k].im },
|
||||
{ tmp2[6*2 + k].im, -tmp2[6*2 + k].im },
|
||||
{ tmp2[6*3 + k].im, -tmp2[6*3 + k].im },
|
||||
{ tmp2[6*4 + k].im, -tmp2[6*4 + k].im },
|
||||
};
|
||||
memcpy(s->exptab + 8*k, ac_exp, 8*sizeof(FFTComplex));
|
||||
}
|
||||
|
||||
/* Specialcase when k = 0 */
|
||||
for (k = 0; k < 3; k++) {
|
||||
FFTComplex dc_exp[] = {
|
||||
{ tmp2[2*k + 0].re, -tmp2[2*k + 0].im },
|
||||
{ tmp2[2*k + 0].im, tmp2[2*k + 0].re },
|
||||
{ tmp2[2*k + 1].re, -tmp2[2*k + 1].im },
|
||||
{ tmp2[2*k + 1].im, tmp2[2*k + 1].re },
|
||||
};
|
||||
memcpy(s->exptab + 8*6 + 4*k, dc_exp, 4*sizeof(FFTComplex));
|
||||
}
|
||||
|
||||
/* 5-point FFT twiddles */
|
||||
exp_5point[0].re = exp_5point[0].im = tmp[19].re;
|
||||
exp_5point[1].re = exp_5point[1].im = tmp[19].im;
|
||||
exp_5point[2].re = exp_5point[2].im = tmp[20].re;
|
||||
exp_5point[3].re = exp_5point[3].im = tmp[20].im;
|
||||
|
||||
memcpy(s->exptab + 8*6 + 4*3, exp_5point, 4*sizeof(FFTComplex));
|
||||
}
|
||||
|
||||
av_cold void ff_mdct15_init_x86(MDCT15Context *s)
|
||||
{
|
||||
int adjust_twiddles = 0;
|
||||
int cpu_flags = av_get_cpu_flags();
|
||||
|
||||
if (ARCH_X86_64 && EXTERNAL_AVX(cpu_flags)) {
|
||||
s->fft15 = ff_fft15_avx;
|
||||
adjust_twiddles = 1;
|
||||
}
|
||||
|
||||
if (adjust_twiddles)
|
||||
perm_twiddles(s);
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user