2 * OpenAL cross platform audio library
3 * Copyright (C) 2014 by Timothy Arceri <t_arceri@yahoo.com.au>.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 * Or go to http://www.gnu.org/copyleft/lgpl.html
23 #include <xmmintrin.h>
24 #include <emmintrin.h>
26 #include "alnumeric.h"
33 #if defined(__GNUC__) && !defined(__clang__) && !defined(__SSE2__)
34 #pragma GCC target("sse2")
38 void Resample_<LerpTag,SSE2Tag>(const InterpState*, const float *RESTRICT src, uint frac,
39 const uint increment, const al::span<float> dst)
41 ASSUME(frac < MixerFracOne);
43 const __m128i increment4{_mm_set1_epi32(static_cast<int>(increment*4))};
44 const __m128 fracOne4{_mm_set1_ps(1.0f/MixerFracOne)};
45 const __m128i fracMask4{_mm_set1_epi32(MixerFracMask)};
47 alignas(16) uint pos_[4], frac_[4];
48 InitPosArrays(frac, increment, frac_, pos_);
49 __m128i frac4{_mm_setr_epi32(static_cast<int>(frac_[0]), static_cast<int>(frac_[1]),
50 static_cast<int>(frac_[2]), static_cast<int>(frac_[3]))};
51 __m128i pos4{_mm_setr_epi32(static_cast<int>(pos_[0]), static_cast<int>(pos_[1]),
52 static_cast<int>(pos_[2]), static_cast<int>(pos_[3]))};
54 auto dst_iter = dst.begin();
55 for(size_t todo{dst.size()>>2};todo;--todo)
57 const int pos0{_mm_cvtsi128_si32(pos4)};
58 const int pos1{_mm_cvtsi128_si32(_mm_srli_si128(pos4, 4))};
59 const int pos2{_mm_cvtsi128_si32(_mm_srli_si128(pos4, 8))};
60 const int pos3{_mm_cvtsi128_si32(_mm_srli_si128(pos4, 12))};
61 const __m128 val1{_mm_setr_ps(src[pos0 ], src[pos1 ], src[pos2 ], src[pos3 ])};
62 const __m128 val2{_mm_setr_ps(src[pos0+1], src[pos1+1], src[pos2+1], src[pos3+1])};
64 /* val1 + (val2-val1)*mu */
65 const __m128 r0{_mm_sub_ps(val2, val1)};
66 const __m128 mu{_mm_mul_ps(_mm_cvtepi32_ps(frac4), fracOne4)};
67 const __m128 out{_mm_add_ps(val1, _mm_mul_ps(mu, r0))};
69 _mm_store_ps(dst_iter, out);
72 frac4 = _mm_add_epi32(frac4, increment4);
73 pos4 = _mm_add_epi32(pos4, _mm_srli_epi32(frac4, MixerFracBits));
74 frac4 = _mm_and_si128(frac4, fracMask4);
77 if(size_t todo{dst.size()&3})
79 src += static_cast<uint>(_mm_cvtsi128_si32(pos4));
80 frac = static_cast<uint>(_mm_cvtsi128_si32(frac4));
83 *(dst_iter++) = lerpf(src[0], src[1], static_cast<float>(frac) * (1.0f/MixerFracOne));
86 src += frac>>MixerFracBits;
87 frac &= MixerFracMask;