alc/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 "alu.h"
  27 #include "defs.h"
  28
  29
  30 template<>
  31 const ALfloat *Resample_<LerpTag,SSE2Tag>(const InterpState*, const ALfloat *RESTRICT src,
  32     ALuint frac, ALuint increment, const al::span<float> dst)
  33 {
  34     const __m128i increment4{_mm_set1_epi32(static_cast<int>(increment*4))};
  35     const __m128 fracOne4{_mm_set1_ps(1.0f/FRACTIONONE)};
  36     const __m128i fracMask4{_mm_set1_epi32(FRACTIONMASK)};
  37
  38     alignas(16) ALuint pos_[4], frac_[4];
  39     InitPosArrays(frac, increment, frac_, pos_, 4);
  40     __m128i frac4{_mm_setr_epi32(static_cast<int>(frac_[0]), static_cast<int>(frac_[1]),
  41         static_cast<int>(frac_[2]), static_cast<int>(frac_[3]))};
  42     __m128i pos4{_mm_setr_epi32(static_cast<int>(pos_[0]), static_cast<int>(pos_[1]),
  43         static_cast<int>(pos_[2]), static_cast<int>(pos_[3]))};
  44
  45     auto dst_iter = dst.begin();
  46     const auto aligned_end = (dst.size()&~3u) + dst_iter;
  47     while(dst_iter != aligned_end)
  48     {
  49         const int pos0{_mm_cvtsi128_si32(_mm_shuffle_epi32(pos4, _MM_SHUFFLE(0, 0, 0, 0)))};
  50         const int pos1{_mm_cvtsi128_si32(_mm_shuffle_epi32(pos4, _MM_SHUFFLE(1, 1, 1, 1)))};
  51         const int pos2{_mm_cvtsi128_si32(_mm_shuffle_epi32(pos4, _MM_SHUFFLE(2, 2, 2, 2)))};
  52         const int pos3{_mm_cvtsi128_si32(_mm_shuffle_epi32(pos4, _MM_SHUFFLE(3, 3, 3, 3)))};
  53         const __m128 val1{_mm_setr_ps(src[pos0  ], src[pos1  ], src[pos2  ], src[pos3  ])};
  54         const __m128 val2{_mm_setr_ps(src[pos0+1], src[pos1+1], src[pos2+1], src[pos3+1])};
  55
  56         /* val1 + (val2-val1)*mu */
  57         const __m128 r0{_mm_sub_ps(val2, val1)};
  58         const __m128 mu{_mm_mul_ps(_mm_cvtepi32_ps(frac4), fracOne4)};
  59         const __m128 out{_mm_add_ps(val1, _mm_mul_ps(mu, r0))};
  60
  61         _mm_store_ps(dst_iter, out);
  62         dst_iter += 4;
  63
  64         frac4 = _mm_add_epi32(frac4, increment4);
  65         pos4 = _mm_add_epi32(pos4, _mm_srli_epi32(frac4, FRACTIONBITS));
  66         frac4 = _mm_and_si128(frac4, fracMask4);
  67     }
  68
  69     if(dst_iter != dst.end())
  70     {
  71         src += static_cast<ALuint>(_mm_cvtsi128_si32(pos4));
  72         frac = static_cast<ALuint>(_mm_cvtsi128_si32(frac4));
  73
  74         do {
  75             *(dst_iter++) = lerp(src[0], src[1], static_cast<float>(frac) * (1.0f/FRACTIONONE));
  76
  77             frac += increment;
  78             src  += frac>>FRACTIONBITS;
  79             frac &= FRACTIONMASK;
  80         } while(dst_iter != dst.end());
  81     }
  82     return dst.begin();
  83 }