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[SIMD] Initial AVX2 code for 4-tap filtering in angular prediction.

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This commit is contained in:
Ari Lemmetti 2021-06-07 22:40:07 +03:00
parent 20f0ff976d
commit 7ccd1a571c
1 changed files with 53 additions and 7 deletions
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60
src/strategies/avx2/intra-avx2.c
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@ -51,6 +51,34 @@ static void kvz_angular_pred_avx2(
assert(log2_width >= 2 && log2_width <= 5);
assert(intra_mode >= 2 && intra_mode <= 66);
__m256i p_shuf_01 = _mm256_setr_epi8(
0x00, 0x01, 0x01, 0x02, 0x02, 0x03, 0x03, 0x04,
0x08, 0x09, 0x09, 0x0a, 0x0a, 0x0b, 0x0b, 0x0c,
0x00, 0x01, 0x01, 0x02, 0x02, 0x03, 0x03, 0x04,
0x08, 0x09, 0x09, 0x0a, 0x0a, 0x0b, 0x0b, 0x0c
);
__m256i p_shuf_23 = _mm256_setr_epi8(
0x02, 0x03, 0x03, 0x04, 0x04, 0x05, 0x05, 0x06,
0x0a, 0x0b, 0x0b, 0x0c, 0x0c, 0x0d, 0x0d, 0x0e,
0x02, 0x03, 0x03, 0x04, 0x04, 0x05, 0x05, 0x06,
0x0a, 0x0b, 0x0b, 0x0c, 0x0c, 0x0d, 0x0d, 0x0e
);
__m256i w_shuf_01 = _mm256_setr_epi8(
0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 0x00, 0x02,
0x08, 0x0a, 0x08, 0x0a, 0x08, 0x0a, 0x08, 0x0a,
0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 0x00, 0x02,
0x08, 0x0a, 0x08, 0x0a, 0x08, 0x0a, 0x08, 0x0a
);
__m256i w_shuf_23 = _mm256_setr_epi8(
0x04, 0x06, 0x04, 0x06, 0x04, 0x06, 0x04, 0x06,
0x0c, 0x0e, 0x0c, 0x0e, 0x0c, 0x0e, 0x0c, 0x0e,
0x04, 0x06, 0x04, 0x06, 0x04, 0x06, 0x04, 0x06,
0x0c, 0x0e, 0x0c, 0x0e, 0x0c, 0x0e, 0x0c, 0x0e
);
static const int16_t modedisp2sampledisp[32] = { 0, 1, 2, 3, 4, 6, 8, 10, 12, 14, 16, 18, 20, 23, 26, 29, 32, 35, 39, 45, 51, 57, 64, 73, 86, 102, 128, 171, 256, 341, 512, 1024 };
static const int16_t modedisp2invsampledisp[32] = { 0, 16384, 8192, 5461, 4096, 2731, 2048, 1638, 1365, 1170, 1024, 910, 819, 712, 630, 565, 512, 468, 420, 364, 321, 287, 256, 224, 191, 161, 128, 96, 64, 48, 32, 16 }; // (512 * 32) / sampledisp
static const int32_t pre_scale[] = { 8, 7, 6, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 0, 0, 0, -1, -1, -2, -3 };
@ -248,7 +276,7 @@ static void kvz_angular_pred_avx2(
// Luma Channel
if (channel_type == 0) {
int32_t ref_main_index[4] = { 0 };
int64_t ref_main_index[4] = { 0 };
int16_t f[4][4] = { { 0 } };
for (int yy = 0; yy < 4; ++yy) {
@ -273,14 +301,32 @@ static void kvz_angular_pred_avx2(
}
// Do 4-tap intra interpolation filtering
for (int_fast32_t x = 0; x < width; x++) {
kvz_pixel *p = (kvz_pixel*)ref_main;
__m256i vidx = _mm256_loadu_si256((__m256i *)ref_main_index);
__m256i all_weights = _mm256_loadu_si256((__m256i *)f);
__m256i w01 = _mm256_shuffle_epi8(all_weights, w_shuf_01);
__m256i w23 = _mm256_shuffle_epi8(all_weights, w_shuf_23);
for (int yy = 0; yy < 4; ++yy){
for (int_fast32_t x = 0; x + 3 < width; x += 4, p += 4) {
kvz_pixel *p = &ref_main[ref_main_index[yy]];
dst[(y + yy) * width + x] = CLIP_TO_PIXEL(((int32_t)(f[yy][0] * p[0]) + (int32_t)(f[yy][1] * p[1]) + (int32_t)(f[yy][2] * p[2]) + (int32_t)(f[yy][3] * p[3]) + 32) >> 6);
ref_main_index[yy] += 1;
}
__m256i vp = _mm256_i64gather_epi64((uint64_t*)p, vidx, 1);
__m256i vp_01 = _mm256_shuffle_epi8(vp, p_shuf_01);
__m256i vp_23 = _mm256_shuffle_epi8(vp, p_shuf_23);
__m256i dot_01 = _mm256_maddubs_epi16(vp_01, w01);
__m256i dot_23 = _mm256_maddubs_epi16(vp_23, w23);
__m256i sum = _mm256_add_epi16(dot_01, dot_23);
sum = _mm256_add_epi16(sum, _mm256_set1_epi16(32));
sum = _mm256_srai_epi16(sum, 6);
__m128i lo = _mm256_castsi256_si128(sum);
__m128i hi = _mm256_extracti128_si256(sum, 1);
__m128i filtered = _mm_packus_epi16(lo, hi);
*(uint32_t*)(dst + (y + 0) * width + x) = _mm_extract_epi32(filtered, 0);
*(uint32_t*)(dst + (y + 1) * width + x) = _mm_extract_epi32(filtered, 1);
*(uint32_t*)(dst + (y + 2) * width + x) = _mm_extract_epi32(filtered, 2);
*(uint32_t*)(dst + (y + 3) * width + x) = _mm_extract_epi32(filtered, 3);
}
}
else {