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/**
* OpenAL cross platform audio library, SSE3 mixer functions
*
* Copyright (C) 2014 by Timothy Arceri <t_arceri@yahoo.com.au>.
* Copyright (C) 2015 by Chris Robinson <chris.kcat@gmail.com>.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
* Or go to http://www.gnu.org/copyleft/lgpl.html
*/
#include "config.h"
#include <xmmintrin.h>
#include <emmintrin.h>
#include <pmmintrin.h>
#include "alu.h"
#include "mixer_defs.h"
const ALfloat *Resample_fir4_SSE3(const InterpState *state,
const ALfloat *restrict src, ALsizei frac, ALint increment,
ALfloat *restrict dst, ALsizei numsamples)
{
const ALfloat (*restrict filter)[4] = ASSUME_ALIGNED(state->sinc4.filter, 16);
const __m128i increment4 = _mm_set1_epi32(increment*4);
const __m128i fracMask4 = _mm_set1_epi32(FRACTIONMASK);
union { alignas(16) ALint i[4]; float f[4]; } pos_;
union { alignas(16) ALsizei i[4]; float f[4]; } frac_;
__m128i frac4, pos4;
ALint pos;
ALsizei i;
InitiatePositionArrays(frac, increment, frac_.i, pos_.i, 4);
frac4 = _mm_castps_si128(_mm_load_ps(frac_.f));
pos4 = _mm_castps_si128(_mm_load_ps(pos_.f));
--src;
for(i = 0;numsamples-i > 3;i += 4)
{
const __m128 val0 = _mm_loadu_ps(&src[pos_.i[0]]);
const __m128 val1 = _mm_loadu_ps(&src[pos_.i[1]]);
const __m128 val2 = _mm_loadu_ps(&src[pos_.i[2]]);
const __m128 val3 = _mm_loadu_ps(&src[pos_.i[3]]);
__m128 k0 = _mm_load_ps(filter[frac_.i[0]]);
__m128 k1 = _mm_load_ps(filter[frac_.i[1]]);
__m128 k2 = _mm_load_ps(filter[frac_.i[2]]);
__m128 k3 = _mm_load_ps(filter[frac_.i[3]]);
__m128 out;
k0 = _mm_mul_ps(k0, val0);
k1 = _mm_mul_ps(k1, val1);
k2 = _mm_mul_ps(k2, val2);
k3 = _mm_mul_ps(k3, val3);
k0 = _mm_hadd_ps(k0, k1);
k2 = _mm_hadd_ps(k2, k3);
out = _mm_hadd_ps(k0, k2);
_mm_store_ps(&dst[i], out);
frac4 = _mm_add_epi32(frac4, increment4);
pos4 = _mm_add_epi32(pos4, _mm_srli_epi32(frac4, FRACTIONBITS));
frac4 = _mm_and_si128(frac4, fracMask4);
_mm_store_ps(pos_.f, _mm_castsi128_ps(pos4));
_mm_store_ps(frac_.f, _mm_castsi128_ps(frac4));
}
/* NOTE: These four elements represent the position *after* the last four
* samples, so the lowest element is the next position to resample.
*/
pos = pos_.i[0];
frac = frac_.i[0];
for(;i < numsamples;i++)
{
dst[i] = resample_fir4(filter, src[pos], src[pos+1], src[pos+2], src[pos+3], frac);
frac += increment;
pos += frac>>FRACTIONBITS;
frac &= FRACTIONMASK;
}
return dst;
}
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