1 /*
2 * Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 // Modified from the Chromium original:
12 // src/media/base/simd/sinc_resampler_sse.cc
13
14 #include "webrtc/common_audio/resampler/sinc_resampler.h"
15
16 #include <xmmintrin.h>
17
18 namespace webrtc {
19
Convolve_SSE(const float * input_ptr,const float * k1,const float * k2,double kernel_interpolation_factor)20 float SincResampler::Convolve_SSE(const float* input_ptr, const float* k1,
21 const float* k2,
22 double kernel_interpolation_factor) {
23 __m128 m_input;
24 __m128 m_sums1 = _mm_setzero_ps();
25 __m128 m_sums2 = _mm_setzero_ps();
26
27 // Based on |input_ptr| alignment, we need to use loadu or load. Unrolling
28 // these loops hurt performance in local testing.
29 if (reinterpret_cast<uintptr_t>(input_ptr) & 0x0F) {
30 for (size_t i = 0; i < kKernelSize; i += 4) {
31 m_input = _mm_loadu_ps(input_ptr + i);
32 m_sums1 = _mm_add_ps(m_sums1, _mm_mul_ps(m_input, _mm_load_ps(k1 + i)));
33 m_sums2 = _mm_add_ps(m_sums2, _mm_mul_ps(m_input, _mm_load_ps(k2 + i)));
34 }
35 } else {
36 for (size_t i = 0; i < kKernelSize; i += 4) {
37 m_input = _mm_load_ps(input_ptr + i);
38 m_sums1 = _mm_add_ps(m_sums1, _mm_mul_ps(m_input, _mm_load_ps(k1 + i)));
39 m_sums2 = _mm_add_ps(m_sums2, _mm_mul_ps(m_input, _mm_load_ps(k2 + i)));
40 }
41 }
42
43 // Linearly interpolate the two "convolutions".
44 m_sums1 = _mm_mul_ps(m_sums1, _mm_set_ps1(
45 static_cast<float>(1.0 - kernel_interpolation_factor)));
46 m_sums2 = _mm_mul_ps(m_sums2, _mm_set_ps1(
47 static_cast<float>(kernel_interpolation_factor)));
48 m_sums1 = _mm_add_ps(m_sums1, m_sums2);
49
50 // Sum components together.
51 float result;
52 m_sums2 = _mm_add_ps(_mm_movehl_ps(m_sums1, m_sums1), m_sums1);
53 _mm_store_ss(&result, _mm_add_ss(m_sums2, _mm_shuffle_ps(
54 m_sums2, m_sums2, 1)));
55
56 return result;
57 }
58
59 } // namespace webrtc
60