mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-12-23 10:05:46 -05:00
94 lines
4.1 KiB
C++
94 lines
4.1 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright (C) 2016 F4EXB //
|
|
// written by Edouard Griffiths //
|
|
// //
|
|
// Integer half-band FIR based interpolator and decimator //
|
|
// This is the even/odd double buffer variant. Really useful only when SIMD is //
|
|
// used //
|
|
// //
|
|
// This program is free software; you can redistribute it and/or modify //
|
|
// it under the terms of the GNU General Public License as published by //
|
|
// the Free Software Foundation as version 3 of the License, or //
|
|
// //
|
|
// This program 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 General Public License V3 for more details. //
|
|
// //
|
|
// You should have received a copy of the GNU General Public License //
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
|
|
///////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifndef SDRBASE_DSP_INTHALFBANDFILTEREO1I_H_
|
|
#define SDRBASE_DSP_INTHALFBANDFILTEREO1I_H_
|
|
|
|
#include <stdint.h>
|
|
|
|
#if defined(USE_SSE4_1)
|
|
#include <smmintrin.h>
|
|
#endif
|
|
|
|
#include "hbfiltertraits.h"
|
|
|
|
template<uint32_t HBFilterOrder>
|
|
class IntHalfbandFilterEO1Intrisics
|
|
{
|
|
public:
|
|
static void work(
|
|
int ptr,
|
|
int32_t even[2][HBFilterOrder],
|
|
int32_t odd[2][HBFilterOrder],
|
|
int32_t& iAcc, int32_t& qAcc)
|
|
{
|
|
#if defined(USE_SSE4_1)
|
|
int a = ptr/2 + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2; // tip pointer
|
|
int b = ptr/2 + 1; // tail pointer
|
|
const __m128i* h = (const __m128i*) HBFIRFilterTraits<HBFilterOrder>::hbCoeffs;
|
|
__m128i sumI = _mm_setzero_si128();
|
|
__m128i sumQ = _mm_setzero_si128();
|
|
__m128i sa, sb;
|
|
a -= 3;
|
|
|
|
for (int i = 0; i < HBFIRFilterTraits<HBFilterOrder>::hbOrder / 16; i++)
|
|
{
|
|
if ((ptr % 2) == 0)
|
|
{
|
|
sa = _mm_shuffle_epi32(_mm_loadu_si128((__m128i*) &(even[0][a])), _MM_SHUFFLE(0,1,2,3));
|
|
sb = _mm_loadu_si128((__m128i*) &(even[0][b]));
|
|
sumI = _mm_add_epi32(sumI, _mm_mullo_epi32(_mm_add_epi32(sa, sb), *h));
|
|
|
|
sa = _mm_shuffle_epi32(_mm_loadu_si128((__m128i*) &(even[1][a])), _MM_SHUFFLE(0,1,2,3));
|
|
sb = _mm_loadu_si128((__m128i*) &(even[1][b]));
|
|
sumQ = _mm_add_epi32(sumQ, _mm_mullo_epi32(_mm_add_epi32(sa, sb), *h));
|
|
}
|
|
else
|
|
{
|
|
sa = _mm_shuffle_epi32(_mm_loadu_si128((__m128i*) &(odd[0][a])), _MM_SHUFFLE(0,1,2,3));
|
|
sb = _mm_loadu_si128((__m128i*) &(odd[0][b]));
|
|
sumI = _mm_add_epi32(sumI, _mm_mullo_epi32(_mm_add_epi32(sa, sb), *h));
|
|
|
|
sa = _mm_shuffle_epi32(_mm_loadu_si128((__m128i*) &(odd[1][a])), _MM_SHUFFLE(0,1,2,3));
|
|
sb = _mm_loadu_si128((__m128i*) &(odd[1][b]));
|
|
sumQ = _mm_add_epi32(sumQ, _mm_mullo_epi32(_mm_add_epi32(sa, sb), *h));
|
|
}
|
|
|
|
a -= 4;
|
|
b += 4;
|
|
++h;
|
|
}
|
|
|
|
// horizontal add of four 32 bit partial sums
|
|
|
|
sumI = _mm_add_epi32(sumI, _mm_srli_si128(sumI, 8));
|
|
sumI = _mm_add_epi32(sumI, _mm_srli_si128(sumI, 4));
|
|
iAcc = _mm_cvtsi128_si32(sumI);
|
|
|
|
sumQ = _mm_add_epi32(sumQ, _mm_srli_si128(sumQ, 8));
|
|
sumQ = _mm_add_epi32(sumQ, _mm_srli_si128(sumQ, 4));
|
|
qAcc = _mm_cvtsi128_si32(sumQ);
|
|
#endif
|
|
}
|
|
};
|
|
|
|
#endif /* SDRBASE_DSP_INTHALFBANDFILTEREO1I_H_ */
|