ref: a57aa0545d5b4779de3cbb238f15fbbacbe38645
dir: /vpx_dsp/x86/sad4d_avx512.c/
/* * 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 res[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 *)(res), sum128); } }