ref: b1f789cf18ffcc976704184f2544d218c88f8ded
dir: /vpx_dsp/x86/convolve_sse2.h/
/*
* Copyright (c) 2018 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_SSE2_H_
#define VPX_VPX_DSP_X86_CONVOLVE_SSE2_H_
#include <assert.h>
#include <emmintrin.h> // SSE2
#include "./vpx_config.h"
// Interprets the input register as 16-bit words 7 6 5 4 3 2 1 0, then returns
// values at index 2 and 3 to return 3 2 3 2 3 2 3 2 as 16-bit words
static INLINE __m128i extract_quarter_2_epi16_sse2(const __m128i *const reg) {
__m128i tmp = _mm_unpacklo_epi32(*reg, *reg);
return _mm_unpackhi_epi64(tmp, tmp);
}
// Interprets the input register as 16-bit words 7 6 5 4 3 2 1 0, then returns
// values at index 2 and 3 to return 5 4 5 4 5 4 5 4 as 16-bit words.
static INLINE __m128i extract_quarter_3_epi16_sse2(const __m128i *const reg) {
__m128i tmp = _mm_unpackhi_epi32(*reg, *reg);
return _mm_unpacklo_epi64(tmp, tmp);
}
// Interprets src as 8-bit words, pads each word with zeroes to form 16-bit
// words, then multiplies with ker and add the adjacent results to form 32-bit
// words. Finally adds the result from 1 and 2 together.
static INLINE __m128i pad_multiply_add_add_epi8_sse2(
const __m128i *const src_1, const __m128i *const src_2,
const __m128i *const ker_1, const __m128i *const ker_2) {
const __m128i src_1_half = _mm_unpacklo_epi8(*src_1, _mm_setzero_si128());
const __m128i src_2_half = _mm_unpacklo_epi8(*src_2, _mm_setzero_si128());
const __m128i madd_1 = _mm_madd_epi16(src_1_half, *ker_1);
const __m128i madd_2 = _mm_madd_epi16(src_2_half, *ker_2);
return _mm_add_epi32(madd_1, madd_2);
}
static INLINE __m128i multiply_add_packs_epi16_sse2(const __m128i *const src_0,
const __m128i *const src_1,
const __m128i *const ker) {
const __m128i madd_1 = _mm_madd_epi16(*src_0, *ker);
const __m128i madd_2 = _mm_madd_epi16(*src_1, *ker);
return _mm_packs_epi32(madd_1, madd_2);
}
static INLINE __m128i combine_epi32_sse2(const __m128i *const src_1,
const __m128i *const src_2) {
const __m128i tmp_1 = _mm_unpacklo_epi32(*src_1, *src_2);
const __m128i tmp_2 = _mm_unpackhi_epi32(*src_1, *src_2);
return _mm_packs_epi32(tmp_1, tmp_2);
}
static INLINE __m128i round_epi16_sse2(const __m128i *const src,
const __m128i *const half_depth,
const int depth) {
const __m128i nearest_src = _mm_adds_epi16(*src, *half_depth);
return _mm_srai_epi16(nearest_src, depth);
}
#endif // VPX_VPX_DSP_X86_CONVOLVE_SSE2_H_