mirror of https://github.com/f4exb/sdrangel.git
94 lines
4.1 KiB
C++
94 lines
4.1 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2016, 2019 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
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// //
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// Integer half-band FIR based interpolator and decimator //
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// This is the even/odd double buffer variant. Really useful only when SIMD is //
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// used //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// (at your option) any later version. //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#ifndef SDRBASE_DSP_INTHALFBANDFILTEREO1I_H_
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#define SDRBASE_DSP_INTHALFBANDFILTEREO1I_H_
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#include <stdint.h>
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#if defined(USE_SSE4_1)
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#include <smmintrin.h>
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#endif
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#include "hbfiltertraits.h"
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template<uint32_t HBFilterOrder>
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class IntHalfbandFilterEO1Intrisics
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{
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public:
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static void work(
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int ptr,
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int32_t even[2][HBFilterOrder],
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int32_t odd[2][HBFilterOrder],
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int32_t& iAcc, int32_t& qAcc)
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{
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#if defined(USE_SSE4_1)
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int a = ptr/2 + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2; // tip pointer
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int b = ptr/2 + 1; // tail pointer
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const __m128i* h = (const __m128i*) HBFIRFilterTraits<HBFilterOrder>::hbCoeffs;
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__m128i sumI = _mm_setzero_si128();
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__m128i sumQ = _mm_setzero_si128();
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__m128i sa, sb;
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a -= 3;
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for (int i = 0; i < HBFIRFilterTraits<HBFilterOrder>::hbOrder / 16; i++)
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{
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if ((ptr % 2) == 0)
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{
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sa = _mm_shuffle_epi32(_mm_loadu_si128((__m128i*) &(even[0][a])), _MM_SHUFFLE(0,1,2,3));
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sb = _mm_loadu_si128((__m128i*) &(even[0][b]));
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sumI = _mm_add_epi32(sumI, _mm_mullo_epi32(_mm_add_epi32(sa, sb), *h));
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sa = _mm_shuffle_epi32(_mm_loadu_si128((__m128i*) &(even[1][a])), _MM_SHUFFLE(0,1,2,3));
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sb = _mm_loadu_si128((__m128i*) &(even[1][b]));
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sumQ = _mm_add_epi32(sumQ, _mm_mullo_epi32(_mm_add_epi32(sa, sb), *h));
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}
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else
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{
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sa = _mm_shuffle_epi32(_mm_loadu_si128((__m128i*) &(odd[0][a])), _MM_SHUFFLE(0,1,2,3));
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sb = _mm_loadu_si128((__m128i*) &(odd[0][b]));
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sumI = _mm_add_epi32(sumI, _mm_mullo_epi32(_mm_add_epi32(sa, sb), *h));
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sa = _mm_shuffle_epi32(_mm_loadu_si128((__m128i*) &(odd[1][a])), _MM_SHUFFLE(0,1,2,3));
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sb = _mm_loadu_si128((__m128i*) &(odd[1][b]));
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sumQ = _mm_add_epi32(sumQ, _mm_mullo_epi32(_mm_add_epi32(sa, sb), *h));
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}
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a -= 4;
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b += 4;
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++h;
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}
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// horizontal add of four 32 bit partial sums
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sumI = _mm_add_epi32(sumI, _mm_srli_si128(sumI, 8));
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sumI = _mm_add_epi32(sumI, _mm_srli_si128(sumI, 4));
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iAcc = _mm_cvtsi128_si32(sumI);
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sumQ = _mm_add_epi32(sumQ, _mm_srli_si128(sumQ, 8));
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sumQ = _mm_add_epi32(sumQ, _mm_srli_si128(sumQ, 4));
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qAcc = _mm_cvtsi128_si32(sumQ);
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#endif
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}
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};
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#endif /* SDRBASE_DSP_INTHALFBANDFILTEREO1I_H_ */
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