ref: f9a13a1786e3ab2a35f9f5a97731ec6d05421dda
dir: /vpx_dsp/x86/convolve_avx2.h/
/*
* 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.
*/
#ifndef VPX_DSP_X86_CONVOLVE_AVX2_H_
#define VPX_DSP_X86_CONVOLVE_AVX2_H_
#include <immintrin.h> // AVX2
#include "./vpx_config.h"
#if defined(__clang__)
#if (__clang_major__ > 0 && __clang_major__ < 3) || \
(__clang_major__ == 3 && __clang_minor__ <= 3) || \
(defined(__APPLE__) && defined(__apple_build_version__) && \
((__clang_major__ == 4 && __clang_minor__ <= 2) || \
(__clang_major__ == 5 && __clang_minor__ == 0)))
#define MM256_BROADCASTSI128_SI256(x) \
_mm_broadcastsi128_si256((__m128i const *)&(x))
#else // clang > 3.3, and not 5.0 on macosx.
#define MM256_BROADCASTSI128_SI256(x) _mm256_broadcastsi128_si256(x)
#endif // clang <= 3.3
#elif defined(__GNUC__)
#if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ <= 6)
#define MM256_BROADCASTSI128_SI256(x) \
_mm_broadcastsi128_si256((__m128i const *)&(x))
#elif __GNUC__ == 4 && __GNUC_MINOR__ == 7
#define MM256_BROADCASTSI128_SI256(x) _mm_broadcastsi128_si256(x)
#else // gcc > 4.7
#define MM256_BROADCASTSI128_SI256(x) _mm256_broadcastsi128_si256(x)
#endif // gcc <= 4.6
#else // !(gcc || clang)
#define MM256_BROADCASTSI128_SI256(x) _mm256_broadcastsi128_si256(x)
#endif // __clang__
static INLINE void shuffle_filter_avx2(const int16_t *const filter,
__m256i *const f) {
const __m256i f_values =
MM256_BROADCASTSI128_SI256(_mm_load_si128((const __m128i *)filter));
// pack and duplicate the filter values
f[0] = _mm256_shuffle_epi8(f_values, _mm256_set1_epi16(0x0200u));
f[1] = _mm256_shuffle_epi8(f_values, _mm256_set1_epi16(0x0604u));
f[2] = _mm256_shuffle_epi8(f_values, _mm256_set1_epi16(0x0a08u));
f[3] = _mm256_shuffle_epi8(f_values, _mm256_set1_epi16(0x0e0cu));
}
static INLINE __m256i convolve8_16_avx2(const __m256i *const s,
const __m256i *const f) {
// multiply 2 adjacent elements with the filter and add the result
const __m256i k_64 = _mm256_set1_epi16(1 << 6);
const __m256i x0 = _mm256_maddubs_epi16(s[0], f[0]);
const __m256i x1 = _mm256_maddubs_epi16(s[1], f[1]);
const __m256i x2 = _mm256_maddubs_epi16(s[2], f[2]);
const __m256i x3 = _mm256_maddubs_epi16(s[3], f[3]);
__m256i 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 = _mm256_add_epi16(x0, x2);
sum2 = _mm256_add_epi16(x1, x3);
// add the rounding offset early to avoid another saturated add
sum1 = _mm256_add_epi16(sum1, k_64);
sum1 = _mm256_adds_epi16(sum1, sum2);
// round and shift by 7 bit each 16 bit
sum1 = _mm256_srai_epi16(sum1, 7);
return sum1;
}
static INLINE __m128i convolve8_8_avx2(const __m256i *const s,
const __m256i *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(_mm256_castsi256_si128(s[0]),
_mm256_castsi256_si128(f[0]));
const __m128i x1 = _mm_maddubs_epi16(_mm256_castsi256_si128(s[1]),
_mm256_castsi256_si128(f[1]));
const __m128i x2 = _mm_maddubs_epi16(_mm256_castsi256_si128(s[2]),
_mm256_castsi256_si128(f[2]));
const __m128i x3 = _mm_maddubs_epi16(_mm256_castsi256_si128(s[3]),
_mm256_castsi256_si128(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;
}
#undef MM256_BROADCASTSI128_SI256
#endif // VPX_DSP_X86_CONVOLVE_AVX2_H_