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/*
* Copyright (c) 2022, Alliance for Open Media. All rights reserved
*
* This source code is subject to the terms of the BSD 2 Clause License and
* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
* was not distributed with this source code in the LICENSE file, you can
* obtain it at www.aomedia.org/license/software. If the Alliance for Open
* Media Patent License 1.0 was not distributed with this source code in the
* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
*/
#include <smmintrin.h>
#include "config/aom_dsp_rtcd.h"
// ref: [0 - 510]
// src: [0 - 510]
// bwl: {2, 3, 4, 5}
int aom_vector_var_sse4_1(const int16_t *ref, const int16_t *src, int bwl) {
const int width = 4 << bwl;
assert(width % 16 == 0);
const __m128i k_one_epi16 = _mm_set1_epi16((int16_t)1);
__m128i mean = _mm_setzero_si128();
__m128i sse = _mm_setzero_si128();
for (int i = 0; i < width; i += 16) {
const __m128i src_line = _mm_loadu_si128((const __m128i *)src);
const __m128i ref_line = _mm_loadu_si128((const __m128i *)ref);
const __m128i src_line2 = _mm_loadu_si128((const __m128i *)(src + 8));
const __m128i ref_line2 = _mm_loadu_si128((const __m128i *)(ref + 8));
__m128i diff = _mm_sub_epi16(ref_line, src_line);
const __m128i diff2 = _mm_sub_epi16(ref_line2, src_line2);
__m128i diff_sqr = _mm_madd_epi16(diff, diff);
const __m128i diff_sqr2 = _mm_madd_epi16(diff2, diff2);
diff = _mm_add_epi16(diff, diff2);
diff_sqr = _mm_add_epi32(diff_sqr, diff_sqr2);
sse = _mm_add_epi32(sse, diff_sqr);
mean = _mm_add_epi16(mean, diff);
src += 16;
ref += 16;
}
// m0 m1 m2 m3
mean = _mm_madd_epi16(mean, k_one_epi16);
// m0+m1 m2+m3 s0+s1 s2+s3
__m128i result = _mm_hadd_epi32(mean, sse);
// m0+m1+m2+m3 s0+s1+s2+s3 x x
result = _mm_add_epi32(result, _mm_bsrli_si128(result, 4));
// (mean * mean): dynamic range 31 bits.
const int mean_int = _mm_extract_epi32(result, 0);
const int sse_int = _mm_extract_epi32(result, 2);
const unsigned int mean_abs = abs(mean_int);
const int var = sse_int - ((mean_abs * mean_abs) >> (bwl + 2));
return var;
}
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