ref: 855a71dfda9fb2620ae5567a5bb0897aa4fc0d47
dir: /vpx_dsp/x86/sad4d_avx2.c/
/*
* Copyright (c) 2014 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <immintrin.h> // AVX2
#include "./vpx_dsp_rtcd.h"
#include "vpx/vpx_integer.h"
static INLINE void calc_final(const __m256i *const sums /*[4]*/,
uint32_t sad_array[4]) {
const __m256i t0 = _mm256_hadd_epi32(sums[0], sums[1]);
const __m256i t1 = _mm256_hadd_epi32(sums[2], sums[3]);
const __m256i t2 = _mm256_hadd_epi32(t0, t1);
const __m128i sum = _mm_add_epi32(_mm256_castsi256_si128(t2),
_mm256_extractf128_si256(t2, 1));
_mm_storeu_si128((__m128i *)sad_array, sum);
}
void vpx_sad32x32x4d_avx2(const uint8_t *src_ptr, int src_stride,
const uint8_t *const ref_array[4], int ref_stride,
uint32_t sad_array[4]) {
int i;
const uint8_t *refs[4];
__m256i sums[4];
refs[0] = ref_array[0];
refs[1] = ref_array[1];
refs[2] = ref_array[2];
refs[3] = ref_array[3];
sums[0] = _mm256_setzero_si256();
sums[1] = _mm256_setzero_si256();
sums[2] = _mm256_setzero_si256();
sums[3] = _mm256_setzero_si256();
for (i = 0; i < 32; i++) {
__m256i r[4];
// load src and all ref[]
const __m256i s = _mm256_load_si256((const __m256i *)src_ptr);
r[0] = _mm256_loadu_si256((const __m256i *)refs[0]);
r[1] = _mm256_loadu_si256((const __m256i *)refs[1]);
r[2] = _mm256_loadu_si256((const __m256i *)refs[2]);
r[3] = _mm256_loadu_si256((const __m256i *)refs[3]);
// sum of the absolute differences between every ref[] to src
r[0] = _mm256_sad_epu8(r[0], s);
r[1] = _mm256_sad_epu8(r[1], s);
r[2] = _mm256_sad_epu8(r[2], s);
r[3] = _mm256_sad_epu8(r[3], s);
// sum every ref[]
sums[0] = _mm256_add_epi32(sums[0], r[0]);
sums[1] = _mm256_add_epi32(sums[1], r[1]);
sums[2] = _mm256_add_epi32(sums[2], r[2]);
sums[3] = _mm256_add_epi32(sums[3], r[3]);
src_ptr += src_stride;
refs[0] += ref_stride;
refs[1] += ref_stride;
refs[2] += ref_stride;
refs[3] += ref_stride;
}
calc_final(sums, sad_array);
}
void vpx_sad64x64x4d_avx2(const uint8_t *src_ptr, int src_stride,
const uint8_t *const ref_array[4], int ref_stride,
uint32_t sad_array[4]) {
__m256i sums[4];
int i;
const uint8_t *refs[4];
refs[0] = ref_array[0];
refs[1] = ref_array[1];
refs[2] = ref_array[2];
refs[3] = ref_array[3];
sums[0] = _mm256_setzero_si256();
sums[1] = _mm256_setzero_si256();
sums[2] = _mm256_setzero_si256();
sums[3] = _mm256_setzero_si256();
for (i = 0; i < 64; i++) {
__m256i r_lo[4], r_hi[4];
// load 64 bytes from src and all ref[]
const __m256i s_lo = _mm256_load_si256((const __m256i *)src_ptr);
const __m256i s_hi = _mm256_load_si256((const __m256i *)(src_ptr + 32));
r_lo[0] = _mm256_loadu_si256((const __m256i *)refs[0]);
r_hi[0] = _mm256_loadu_si256((const __m256i *)(refs[0] + 32));
r_lo[1] = _mm256_loadu_si256((const __m256i *)refs[1]);
r_hi[1] = _mm256_loadu_si256((const __m256i *)(refs[1] + 32));
r_lo[2] = _mm256_loadu_si256((const __m256i *)refs[2]);
r_hi[2] = _mm256_loadu_si256((const __m256i *)(refs[2] + 32));
r_lo[3] = _mm256_loadu_si256((const __m256i *)refs[3]);
r_hi[3] = _mm256_loadu_si256((const __m256i *)(refs[3] + 32));
// sum of the absolute differences between every ref[] to src
r_lo[0] = _mm256_sad_epu8(r_lo[0], s_lo);
r_lo[1] = _mm256_sad_epu8(r_lo[1], s_lo);
r_lo[2] = _mm256_sad_epu8(r_lo[2], s_lo);
r_lo[3] = _mm256_sad_epu8(r_lo[3], s_lo);
r_hi[0] = _mm256_sad_epu8(r_hi[0], s_hi);
r_hi[1] = _mm256_sad_epu8(r_hi[1], s_hi);
r_hi[2] = _mm256_sad_epu8(r_hi[2], s_hi);
r_hi[3] = _mm256_sad_epu8(r_hi[3], s_hi);
// sum every ref[]
sums[0] = _mm256_add_epi32(sums[0], r_lo[0]);
sums[1] = _mm256_add_epi32(sums[1], r_lo[1]);
sums[2] = _mm256_add_epi32(sums[2], r_lo[2]);
sums[3] = _mm256_add_epi32(sums[3], r_lo[3]);
sums[0] = _mm256_add_epi32(sums[0], r_hi[0]);
sums[1] = _mm256_add_epi32(sums[1], r_hi[1]);
sums[2] = _mm256_add_epi32(sums[2], r_hi[2]);
sums[3] = _mm256_add_epi32(sums[3], r_hi[3]);
src_ptr += src_stride;
refs[0] += ref_stride;
refs[1] += ref_stride;
refs[2] += ref_stride;
refs[3] += ref_stride;
}
calc_final(sums, sad_array);
}