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/*
* Copyright (c) 2021, 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.
*/
#ifndef AOM_AOM_DSP_X86_CONVOLVE_SSSE3_H_
#define AOM_AOM_DSP_X86_CONVOLVE_SSSE3_H_
#include <tmmintrin.h> // SSSE3
static INLINE void shuffle_filter_ssse3(const int16_t *const filter,
__m128i *const f) {
const __m128i f_values = _mm_load_si128((const __m128i *)filter);
// pack and duplicate the filter values
f[0] = _mm_shuffle_epi8(f_values, _mm_set1_epi16(0x0200u));
f[1] = _mm_shuffle_epi8(f_values, _mm_set1_epi16(0x0604u));
f[2] = _mm_shuffle_epi8(f_values, _mm_set1_epi16(0x0a08u));
f[3] = _mm_shuffle_epi8(f_values, _mm_set1_epi16(0x0e0cu));
}
static INLINE __m128i convolve8_8_ssse3(const __m128i *const s,
const __m128i *const f) {
// multiply 2 adjacent elements with the filter and add the result
const __m128i k_64 = _mm_set1_epi16(1 << 6);
const __m128i x0 = _mm_maddubs_epi16(s[0], f[0]);
const __m128i x1 = _mm_maddubs_epi16(s[1], f[1]);
const __m128i x2 = _mm_maddubs_epi16(s[2], f[2]);
const __m128i x3 = _mm_maddubs_epi16(s[3], f[3]);
__m128i sum1, sum2;
// sum the results together, saturating only on the final step
// adding x0 with x2 and x1 with x3 is the only order that prevents
// outranges for all filters
sum1 = _mm_add_epi16(x0, x2);
sum2 = _mm_add_epi16(x1, x3);
// add the rounding offset early to avoid another saturated add
sum1 = _mm_add_epi16(sum1, k_64);
sum1 = _mm_adds_epi16(sum1, sum2);
// shift by 7 bit each 16 bit
sum1 = _mm_srai_epi16(sum1, 7);
return sum1;
}
#endif // AOM_AOM_DSP_X86_CONVOLVE_SSSE3_H_
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