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Optimize sao edge ddistortion

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This commit is contained in:
Ari Lemmetti 2016-03-16 19:42:56 +02:00
parent 941b6b3e27
commit ba69992941
1 changed files with 64 additions and 10 deletions
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74
src/strategies/avx2/sao-avx2.c
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@ -24,6 +24,7 @@
#include "sao.h"
#include "strategyselector.h"
#include "rdo.h"
#include "strategies/strategies-common.h"
#if COMPILE_INTEL_AVX2
#include <immintrin.h>
@ -31,6 +32,23 @@
// Might be useful to check that if (when) this file
// is difficult to understand.
static INLINE __m256i load_6_offsets(const int* offsets){
return _mm256_inserti128_si256(_mm256_castsi128_si256(_mm_loadu_si128((__m128i*) offsets)), _mm_loadl_epi64((__m128i*)&(offsets[4])), 1);
}
static INLINE __m128i load_6_pixels(const kvz_pixel* data){
return _mm_insert_epi16(_mm_cvtsi32_si128(*(int32_t*)&(data[0])), *(int16_t*)&(data[4]), 2);
}
static INLINE __m256i load_5_offsets(const int* offsets){
return _mm256_inserti128_si256(_mm256_castsi128_si256(_mm_loadu_si128((__m128i*) offsets)), _mm_insert_epi32(_mm_setzero_si128(), offsets[4], 0), 1);
}
// Mapping of edge_idx values to eo-classes.
static int sao_calc_eo_cat(kvz_pixel a, kvz_pixel b, kvz_pixel c)
{
@ -73,23 +91,59 @@ int kvz_sao_edge_ddistortion_avx2(const kvz_pixel *orig_data, const kvz_pixel *r
vector2d_t a_ofs = g_sao_edge_offsets[eo_class][0];
vector2d_t b_ofs = g_sao_edge_offsets[eo_class][1];
__m256i v_accum = { 0 };
for (y = 1; y < block_height - 1; ++y) {
for (x = 1; x < block_width - 1; ++x) {
for (x = 1; x < block_width - 8; x+=8) {
const kvz_pixel *c_data = &rec_data[y * block_width + x];
kvz_pixel a = c_data[a_ofs.y * block_width + a_ofs.x];
kvz_pixel c = c_data[0];
kvz_pixel b = c_data[b_ofs.y * block_width + b_ofs.x];
int offset = offsets[sao_calc_eo_cat(a, b, c)];
__m128i v_c_data = _mm_loadl_epi64((__m128i*)c_data);
__m128i v_a = _mm_loadl_epi64((__m128i*)(&c_data[a_ofs.y * block_width + a_ofs.x]));
__m128i v_c = v_c_data;
__m128i v_b = _mm_loadl_epi64((__m128i*)(&c_data[b_ofs.y * block_width + b_ofs.x]));
if (offset != 0) {
int diff = orig_data[y * block_width + x] - c;
// Offset is applied to reconstruction, so it is subtracted from diff.
sum += (diff - offset) * (diff - offset) - diff * diff;
}
__m256i v_cat = _mm256_cvtepu8_epi32(sao_calc_eo_cat_avx2(&v_a, &v_b, &v_c));
__m256i v_offset = _mm256_loadu_si256((__m256i*) offsets);
v_offset = _mm256_permutevar8x32_epi32(v_offset, v_cat);
__m256i v_diff = _mm256_cvtepu8_epi32(_mm_loadl_epi64((__m128i*)&(orig_data[y * block_width + x])));
v_diff = _mm256_sub_epi32(v_diff, _mm256_cvtepu8_epi32(v_c));
__m256i v_diff_minus_offset = _mm256_sub_epi32(v_diff, v_offset);
__m256i v_temp_sum = _mm256_sub_epi32(_mm256_mullo_epi32(v_diff_minus_offset, v_diff_minus_offset), _mm256_mullo_epi32(v_diff, v_diff));
v_accum = _mm256_add_epi32(v_accum, v_temp_sum);
}
//Handle last 6 pixels separately to prevent reading over boundary
const kvz_pixel *c_data = &rec_data[y * block_width + x];
__m128i v_c_data = load_6_pixels(c_data);
const kvz_pixel* a_ptr = &c_data[a_ofs.y * block_width + a_ofs.x];
const kvz_pixel* b_ptr = &c_data[b_ofs.y * block_width + b_ofs.x];
__m128i v_a = load_6_pixels(a_ptr);
__m128i v_c = v_c_data;
__m128i v_b = load_6_pixels(b_ptr);
__m256i v_cat = _mm256_cvtepu8_epi32(sao_calc_eo_cat_avx2(&v_a, &v_b, &v_c));
__m256i v_offset = load_6_offsets(offsets);
v_offset = _mm256_permutevar8x32_epi32(v_offset, v_cat);
const kvz_pixel* orig_ptr = &(orig_data[y * block_width + x]);
__m256i v_diff = _mm256_cvtepu8_epi32(load_6_pixels(orig_ptr));
v_diff = _mm256_sub_epi32(v_diff, _mm256_cvtepu8_epi32(v_c));
__m256i v_diff_minus_offset = _mm256_sub_epi32(v_diff, v_offset);
__m256i v_temp_sum = _mm256_sub_epi32(_mm256_mullo_epi32(v_diff_minus_offset, v_diff_minus_offset), _mm256_mullo_epi32(v_diff, v_diff));
v_accum = _mm256_add_epi32(v_accum, v_temp_sum);
}
//Full horizontal sum
v_accum = _mm256_add_epi32(v_accum, _mm256_castsi128_si256(_mm256_extracti128_si256(v_accum, 1)));
v_accum = _mm256_add_epi32(v_accum, _mm256_shuffle_epi32(v_accum, KVZ_PERMUTE(2, 3, 0, 1)));
v_accum = _mm256_add_epi32(v_accum, _mm256_shuffle_epi32(v_accum, KVZ_PERMUTE(1, 0, 1, 0)));
sum += _mm_cvtsi128_si32(_mm256_castsi256_si128(v_accum));
return sum;
}