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/*
* Copyright (c) 2017 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> // AVX512
#include "./vpx_dsp_rtcd.h"
#include "vpx/vpx_integer.h"
void vpx_sad64x64x4d_avx512(const uint8_t *src_ptr, int src_stride,
const uint8_t *const ref_array[4], int ref_stride,
uint32_t sad_array[4]) {
__m512i src_reg, ref0_reg, ref1_reg, ref2_reg, ref3_reg;
__m512i sum_ref0, sum_ref1, sum_ref2, sum_ref3;
__m512i sum_mlow, sum_mhigh;
int i;
const uint8_t *ref0, *ref1, *ref2, *ref3;
ref0 = ref_array[0];
ref1 = ref_array[1];
ref2 = ref_array[2];
ref3 = ref_array[3];
sum_ref0 = _mm512_set1_epi16(0);
sum_ref1 = _mm512_set1_epi16(0);
sum_ref2 = _mm512_set1_epi16(0);
sum_ref3 = _mm512_set1_epi16(0);
for (i = 0; i < 64; i++) {
// load src and all ref[]
src_reg = _mm512_loadu_si512((const __m512i *)src_ptr);
ref0_reg = _mm512_loadu_si512((const __m512i *)ref0);
ref1_reg = _mm512_loadu_si512((const __m512i *)ref1);
ref2_reg = _mm512_loadu_si512((const __m512i *)ref2);
ref3_reg = _mm512_loadu_si512((const __m512i *)ref3);
// sum of the absolute differences between every ref[] to src
ref0_reg = _mm512_sad_epu8(ref0_reg, src_reg);
ref1_reg = _mm512_sad_epu8(ref1_reg, src_reg);
ref2_reg = _mm512_sad_epu8(ref2_reg, src_reg);
ref3_reg = _mm512_sad_epu8(ref3_reg, src_reg);
// sum every ref[]
sum_ref0 = _mm512_add_epi32(sum_ref0, ref0_reg);
sum_ref1 = _mm512_add_epi32(sum_ref1, ref1_reg);
sum_ref2 = _mm512_add_epi32(sum_ref2, ref2_reg);
sum_ref3 = _mm512_add_epi32(sum_ref3, ref3_reg);
src_ptr += src_stride;
ref0 += ref_stride;
ref1 += ref_stride;
ref2 += ref_stride;
ref3 += ref_stride;
}
{
__m256i sum256;
__m128i sum128;
// in sum_ref[] the result is saved in the first 4 bytes
// the other 4 bytes are zeroed.
// sum_ref1 and sum_ref3 are shifted left by 4 bytes
sum_ref1 = _mm512_bslli_epi128(sum_ref1, 4);
sum_ref3 = _mm512_bslli_epi128(sum_ref3, 4);
// merge sum_ref0 and sum_ref1 also sum_ref2 and sum_ref3
sum_ref0 = _mm512_or_si512(sum_ref0, sum_ref1);
sum_ref2 = _mm512_or_si512(sum_ref2, sum_ref3);
// merge every 64 bit from each sum_ref[]
sum_mlow = _mm512_unpacklo_epi64(sum_ref0, sum_ref2);
sum_mhigh = _mm512_unpackhi_epi64(sum_ref0, sum_ref2);
// add the low 64 bit to the high 64 bit
sum_mlow = _mm512_add_epi32(sum_mlow, sum_mhigh);
// add the low 128 bit to the high 128 bit
sum256 = _mm256_add_epi32(_mm512_castsi512_si256(sum_mlow),
_mm512_extracti32x8_epi32(sum_mlow, 1));
sum128 = _mm_add_epi32(_mm256_castsi256_si128(sum256),
_mm256_extractf128_si256(sum256, 1));
_mm_storeu_si128((__m128i *)(sad_array), sum128);
}
}
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