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1 // Copyright 2013 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "media/base/sinc_resampler.h" | |
6 | |
7 #include <xmmintrin.h> | |
8 | |
9 namespace media { | |
10 | |
11 float SincResampler::Convolve_SSE(const float* input_ptr, const float* k1, | |
12 const float* k2, | |
13 double kernel_interpolation_factor) { | |
14 __m128 m_input; | |
15 __m128 m_sums1 = _mm_setzero_ps(); | |
16 __m128 m_sums2 = _mm_setzero_ps(); | |
17 | |
18 // Based on |input_ptr| alignment, we need to use loadu or load. Unrolling | |
19 // these loops hurt performance in local testing. | |
20 if (reinterpret_cast<uintptr_t>(input_ptr) & 0x0F) { | |
21 for (int i = 0; i < kKernelSize; i += 4) { | |
22 m_input = _mm_loadu_ps(input_ptr + i); | |
23 m_sums1 = _mm_add_ps(m_sums1, _mm_mul_ps(m_input, _mm_load_ps(k1 + i))); | |
24 m_sums2 = _mm_add_ps(m_sums2, _mm_mul_ps(m_input, _mm_load_ps(k2 + i))); | |
25 } | |
26 } else { | |
27 for (int i = 0; i < kKernelSize; i += 4) { | |
28 m_input = _mm_load_ps(input_ptr + i); | |
29 m_sums1 = _mm_add_ps(m_sums1, _mm_mul_ps(m_input, _mm_load_ps(k1 + i))); | |
30 m_sums2 = _mm_add_ps(m_sums2, _mm_mul_ps(m_input, _mm_load_ps(k2 + i))); | |
31 } | |
32 } | |
33 | |
34 // Linearly interpolate the two "convolutions". | |
35 m_sums1 = _mm_mul_ps(m_sums1, _mm_set_ps1(1.0 - kernel_interpolation_factor)); | |
36 m_sums2 = _mm_mul_ps(m_sums2, _mm_set_ps1(kernel_interpolation_factor)); | |
37 m_sums1 = _mm_add_ps(m_sums1, m_sums2); | |
38 | |
39 // Sum components together. | |
40 float result; | |
41 m_sums2 = _mm_add_ps(_mm_movehl_ps(m_sums1, m_sums1), m_sums1); | |
42 _mm_store_ss(&result, _mm_add_ss(m_sums2, _mm_shuffle_ps( | |
43 m_sums2, m_sums2, 1))); | |
44 | |
45 return result; | |
46 } | |
47 | |
48 } // namespace media | |
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