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x86/tx_float: add a standalone 15-point AVX2 transform 

Enables its use everywhere else in the framework.
This commit is contained in:
Lynne 2022-09-28 06:46:57 +02:00
parent 877e575b5d
commit cc1df4045e
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GPG Key ID: A2FEA5F03F034464
2 changed files with 117 additions and 0 deletions
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63
libavutil/x86/tx_float.asm
View File

@ -1515,6 +1515,69 @@ FFT_SPLIT_RADIX_FN avx2, 1
%endif
%endif
%macro FFT15_FN 2
INIT_YMM avx2
cglobal fft15_ %+ %2, 4, 10, 16, ctx, out, in, stride, len, lut, tmp, tgt5, stride3, stride5
mov lutq, [ctxq + AVTXContext.map]
imul stride3q, strideq, 3
imul stride5q, strideq, 5
movaps m11, [mask_mmppmmmm] ; mmppmmmm
movaps m10, [tab_53_float] ; tab5
movaps xm9, [tab_53_float + 32] ; tab3
vpermpd m9, m9, q1110 ; tab[23232323]
movaps m8, [s15_perm]
%if %1
movups xm0, [inq]
movddup xm5, [inq + 16]
movups m2, [inq + mmsize*0 + 24]
movups m3, [inq + mmsize*1 + 24]
movups m4, [inq + mmsize*2 + 24]
%else
LOAD64_LUT xm0, inq, lutq, 0, tmpq, m14, xm15
LOAD64_LUT m2, inq, lutq, (mmsize/2)*0 + 12, tmpq, m6, m7
LOAD64_LUT m3, inq, lutq, (mmsize/2)*1 + 12, tmpq, m14, m15
LOAD64_LUT m4, inq, lutq, (mmsize/2)*2 + 12, tmpq, m6, m7
mov tmpd, [lutq + 8]
movddup xm5, [inq + tmpq*8]
%endif
FFT15
lea tgt5q, [outq + stride5q]
lea tmpq, [outq + stride5q*2]
movhps [outq], xm14 ; out[0]
movhps [outq + stride5q*1], xm15 ; out[5]
movlps [outq + stride5q*2], xm15 ; out[10]
vextractf128 xm3, m0, 1
vextractf128 xm4, m1, 1
vextractf128 xm5, m2, 1
movlps [outq + strideq*1], xm1
movhps [outq + strideq*2], xm2
movlps [outq + stride3q*1], xm3
movhps [outq + strideq*4], xm4
movlps [outq + stride3q*2], xm0
movlps [outq + strideq*8], xm5
movhps [outq + stride3q*4], xm0
movhps [tgt5q + strideq*2], xm1
movhps [tgt5q + strideq*4], xm3
movlps [tmpq + strideq*1], xm2
movlps [tmpq + stride3q*1], xm4
movhps [tmpq + strideq*4], xm5
RET
%endmacro
%if ARCH_X86_64 && HAVE_AVX2_EXTERNAL
FFT15_FN 0, float
FFT15_FN 1, ns_float
%endif
%macro IMDCT_FN 1
INIT_YMM %1
cglobal mdct_inv_float, 4, 14, 16, 320, ctx, out, in, stride, len, lut, exp, t1, t2, t3, \

54
libavutil/x86/tx_float_init.c
View File

@ -30,6 +30,8 @@ TX_DECL_FN(fft8, sse3)
TX_DECL_FN(fft8_ns, sse3)
TX_DECL_FN(fft8, avx)
TX_DECL_FN(fft8_ns, avx)
TX_DECL_FN(fft15, avx2)
TX_DECL_FN(fft15_ns, avx2)
TX_DECL_FN(fft16, avx)
TX_DECL_FN(fft16_ns, avx)
TX_DECL_FN(fft16, fma3)
@ -85,6 +87,53 @@ static av_cold int b ##basis## _i ##interleave(AVTXContext *s, \
DECL_INIT_FN(8, 0)
DECL_INIT_FN(8, 2)
static av_cold int factor_init(AVTXContext *s, const FFTXCodelet *cd,
uint64_t flags, FFTXCodeletOptions *opts,
int len, int inv, const void *scale)
{
TX_TAB(ff_tx_init_tabs)(len);
s->map = av_malloc(len*sizeof(s->map));
s->map[0] = 0; /* DC is always at the start */
if (inv) /* Reversing the ACs flips the transform direction */
for (int i = 1; i < len; i++)
s->map[i] = len - i;
else
for (int i = 1; i < len; i++)
s->map[i] = i;
if (len == 15) {
int cnt = 0, tmp[15];
/* Our 15-point transform is actually a 5x3 PFA, so embed its input map. */
memcpy(tmp, s->map, 15*sizeof(*tmp));
for (int i = 0; i < 5; i++)
for (int j = 0; j < 3; j++)
s->map[i*3 + j] = tmp[(i*3 + j*5) % 15];
/* Special 15-point assembly permutation */
memcpy(tmp, s->map, 15*sizeof(*tmp));
for (int i = 1; i < 15; i += 3) {
s->map[cnt] = tmp[i];
cnt++;
}
for (int i = 2; i < 15; i += 3) {
s->map[cnt] = tmp[i];
cnt++;
}
for (int i = 0; i < 15; i += 3) {
s->map[cnt] = tmp[i];
cnt++;
}
memmove(&s->map[7], &s->map[6], 4*sizeof(int));
memmove(&s->map[3], &s->map[1], 4*sizeof(int));
s->map[1] = tmp[2];
s->map[2] = tmp[0];
}
return 0;
}
static av_cold int m_inv_init(AVTXContext *s, const FFTXCodelet *cd,
uint64_t flags, FFTXCodeletOptions *opts,
int len, int inv, const void *scale)
@ -229,6 +278,11 @@ const FFTXCodelet * const ff_tx_codelet_list_float_x86[] = {
AV_CPU_FLAG_AVXSLOW),
#if HAVE_AVX2_EXTERNAL
TX_DEF(fft15, FFT, 15, 15, 15, 0, 320, factor_init, avx2, AVX2,
AV_TX_INPLACE, AV_CPU_FLAG_AVXSLOW),
TX_DEF(fft15_ns, FFT, 15, 15, 15, 0, 384, factor_init, avx2, AVX2,
AV_TX_INPLACE | FF_TX_PRESHUFFLE, AV_CPU_FLAG_AVXSLOW),
TX_DEF(fft_sr, FFT, 64, 131072, 2, 0, 320, b8_i2, avx2, AVX2, 0,
AV_CPU_FLAG_AVXSLOW | AV_CPU_FLAG_SLOW_GATHER),
TX_DEF(fft_sr_asm, FFT, 64, 131072, 2, 0, 384, b8_i2, avx2, AVX2,