ref: 2a1d89e2782087c240635362b4875cc702e16cf5
dir: /vpx_dsp/x86/convolve_ssse3.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_VPX_DSP_X86_CONVOLVE_SSSE3_H_
#define VPX_VPX_DSP_X86_CONVOLVE_SSSE3_H_
#include <assert.h>
#include <tmmintrin.h> // SSSE3
#include "./vpx_config.h"
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 void shuffle_filter_odd_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
// It utilizes the fact that the high byte of filter[3] is always 0 to clean
// half of f[0] and f[4].
assert(filter[3] >= 0 && filter[3] < 256);
f[0] = _mm_shuffle_epi8(f_values, _mm_set1_epi16(0x0007u));
f[1] = _mm_shuffle_epi8(f_values, _mm_set1_epi16(0x0402u));
f[2] = _mm_shuffle_epi8(f_values, _mm_set1_epi16(0x0806u));
f[3] = _mm_shuffle_epi8(f_values, _mm_set1_epi16(0x0c0au));
f[4] = _mm_shuffle_epi8(f_values, _mm_set1_epi16(0x070eu));
}
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;
}
static INLINE __m128i convolve8_8_even_offset_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]);
// compensate the subtracted 64 in f[1]. x4 is always non negative.
const __m128i x4 = _mm_maddubs_epi16(s[1], _mm_set1_epi8(64));
// add and saturate the results together
__m128i temp = _mm_adds_epi16(x0, x3);
temp = _mm_adds_epi16(temp, x1);
temp = _mm_adds_epi16(temp, x2);
temp = _mm_adds_epi16(temp, x4);
// round and shift by 7 bit each 16 bit
temp = _mm_adds_epi16(temp, k_64);
temp = _mm_srai_epi16(temp, 7);
return temp;
}
static INLINE __m128i convolve8_8_odd_offset_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]);
const __m128i x4 = _mm_maddubs_epi16(s[4], f[4]);
// compensate the subtracted 64 in f[2]. x5 is always non negative.
const __m128i x5 = _mm_maddubs_epi16(s[2], _mm_set1_epi8(64));
__m128i temp;
// add and saturate the results together
temp = _mm_adds_epi16(x0, x1);
temp = _mm_adds_epi16(temp, x2);
temp = _mm_adds_epi16(temp, x3);
temp = _mm_adds_epi16(temp, x4);
temp = _mm_adds_epi16(temp, x5);
// round and shift by 7 bit each 16 bit
temp = _mm_adds_epi16(temp, k_64);
temp = _mm_srai_epi16(temp, 7);
return temp;
}
#endif // VPX_VPX_DSP_X86_CONVOLVE_SSSE3_H_