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/*
* Copyright (c) 2018, 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 <tmmintrin.h>
#include "config/aom_config.h"
#include "config/aom_dsp_rtcd.h"
#include "aom_dsp/x86/synonyms.h"
#include "aom_dsp/x86/variance_impl_ssse3.h"
void aom_var_filter_block2d_bil_first_pass_ssse3(
const uint8_t *a, uint16_t *b, unsigned int src_pixels_per_line,
unsigned int pixel_step, unsigned int output_height,
unsigned int output_width, const uint8_t *filter) {
// Note: filter[0], filter[1] could be {128, 0}, where 128 will overflow
// in computation using _mm_maddubs_epi16.
// Change {128, 0} to {64, 0} and reduce FILTER_BITS by 1 to avoid overflow.
const int16_t round = (1 << (FILTER_BITS - 1)) >> 1;
const __m128i r = _mm_set1_epi16(round);
const int8_t f0 = (int8_t)(filter[0] >> 1);
const int8_t f1 = (int8_t)(filter[1] >> 1);
const __m128i filters = _mm_setr_epi8(f0, f1, f0, f1, f0, f1, f0, f1, f0, f1,
f0, f1, f0, f1, f0, f1);
unsigned int i, j;
(void)pixel_step;
if (output_width >= 8) {
for (i = 0; i < output_height; ++i) {
for (j = 0; j < output_width; j += 8) {
// load source
__m128i source_low = xx_loadl_64(a);
__m128i source_hi = xx_loadl_64(a + 1);
// unpack to:
// { a[0], a[1], a[1], a[2], a[2], a[3], a[3], a[4],
// a[4], a[5], a[5], a[6], a[6], a[7], a[7], a[8] }
__m128i source = _mm_unpacklo_epi8(source_low, source_hi);
// b[i] = a[i] * filter[0] + a[i + 1] * filter[1]
__m128i res = _mm_maddubs_epi16(source, filters);
// round
res = _mm_srai_epi16(_mm_add_epi16(res, r), FILTER_BITS - 1);
xx_storeu_128(b, res);
a += 8;
b += 8;
}
a += src_pixels_per_line - output_width;
}
} else {
const __m128i shuffle_mask =
_mm_setr_epi8(0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8);
for (i = 0; i < output_height; ++i) {
// load source, only first 5 values are meaningful:
// { a[0], a[1], a[2], a[3], a[4], xxxx }
__m128i source = xx_loadl_64(a);
// shuffle, up to the first 8 are useful
// { a[0], a[1], a[1], a[2], a[2], a[3], a[3], a[4],
// a[4], a[5], a[5], a[6], a[6], a[7], a[7], a[8] }
__m128i source_shuffle = _mm_shuffle_epi8(source, shuffle_mask);
__m128i res = _mm_maddubs_epi16(source_shuffle, filters);
res = _mm_srai_epi16(_mm_add_epi16(res, r), FILTER_BITS - 1);
xx_storel_64(b, res);
a += src_pixels_per_line;
b += output_width;
}
}
}
void aom_var_filter_block2d_bil_second_pass_ssse3(
const uint16_t *a, uint8_t *b, unsigned int src_pixels_per_line,
unsigned int pixel_step, unsigned int output_height,
unsigned int output_width, const uint8_t *filter) {
const int16_t round = (1 << FILTER_BITS) >> 1;
const __m128i r = _mm_set1_epi32(round);
const __m128i filters =
_mm_setr_epi16(filter[0], filter[1], filter[0], filter[1], filter[0],
filter[1], filter[0], filter[1]);
const __m128i shuffle_mask =
_mm_setr_epi8(0, 1, 8, 9, 2, 3, 10, 11, 4, 5, 12, 13, 6, 7, 14, 15);
const __m128i mask =
_mm_setr_epi8(0, 4, 8, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1);
unsigned int i, j;
for (i = 0; i < output_height; ++i) {
for (j = 0; j < output_width; j += 4) {
// load source as:
// { a[0], a[1], a[2], a[3], a[w], a[w+1], a[w+2], a[w+3] }
__m128i source1 = xx_loadl_64(a);
__m128i source2 = xx_loadl_64(a + pixel_step);
__m128i source = _mm_unpacklo_epi64(source1, source2);
// shuffle source to:
// { a[0], a[w], a[1], a[w+1], a[2], a[w+2], a[3], a[w+3] }
__m128i source_shuffle = _mm_shuffle_epi8(source, shuffle_mask);
// b[i] = a[i] * filter[0] + a[w + i] * filter[1]
__m128i res = _mm_madd_epi16(source_shuffle, filters);
// round
res = _mm_srai_epi32(_mm_add_epi32(res, r), FILTER_BITS);
// shuffle to get each lower 8 bit of every 32 bit
res = _mm_shuffle_epi8(res, mask);
xx_storel_32(b, res);
a += 4;
b += 4;
}
a += src_pixels_per_line - output_width;
}
}