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[ext/openal.git] / core / mixer / mixer_sse2.cpp
1 /**
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.
8  *
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.
13  *
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
19  */
20
21 #include "config.h"
22
23 #include <xmmintrin.h>
24 #include <emmintrin.h>
25
26 #include "alnumeric.h"
27 #include "defs.h"
28
29 struct SSE2Tag;
30 struct LerpTag;
31
32
33 #if defined(__GNUC__) && !defined(__clang__) && !defined(__SSE2__)
34 #pragma GCC target("sse2")
35 #endif
36
37 template<>
38 void Resample_<LerpTag,SSE2Tag>(const InterpState*, const float *RESTRICT src, uint frac,
39     const uint increment, const al::span<float> dst)
40 {
41     ASSUME(frac < MixerFracOne);
42
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)};
46
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]))};
53
54     auto dst_iter = dst.begin();
55     for(size_t todo{dst.size()>>2};todo;--todo)
56     {
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])};
63
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))};
68
69         _mm_store_ps(dst_iter, out);
70         dst_iter += 4;
71
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);
75     }
76
77     if(size_t todo{dst.size()&3})
78     {
79         src += static_cast<uint>(_mm_cvtsi128_si32(pos4));
80         frac = static_cast<uint>(_mm_cvtsi128_si32(frac4));
81
82         do {
83             *(dst_iter++) = lerpf(src[0], src[1], static_cast<float>(frac) * (1.0f/MixerFracOne));
84
85             frac += increment;
86             src  += frac>>MixerFracBits;
87             frac &= MixerFracMask;
88         } while(--todo);
89     }
90 }