mirror of https://github.com/gnss-sdr/gnss-sdr
601 lines
30 KiB
C
601 lines
30 KiB
C
/*!
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* \file volk_gnsssdr_16ic_xn_resampler_16ic_xn.h
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* \brief VOLK_GNSSSDR kernel: Resamples N 16 bits integer short complex vectors using zero hold resample algorithm.
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* \authors <ul>
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* <li> Javier Arribas, 2015. jarribas(at)cttc.es
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* </ul>
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*
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* VOLK_GNSSSDR kernel that resamples N 16 bits integer short complex vectors using zero hold resample algorithm.
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* It resamples a single GNSS local code signal replica into N vectors fractional-resampled and fractional-delayed
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* (i.e. it creates the Early, Prompt, and Late code replicas)
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*
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* -----------------------------------------------------------------------------
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*
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* GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
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* This file is part of GNSS-SDR.
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*
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* Copyright (C) 2010-2020 (see AUTHORS file for a list of contributors)
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* SPDX-License-Identifier: GPL-3.0-or-later
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*
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* -----------------------------------------------------------------------------
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*/
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/*!
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* \page volk_gnsssdr_16ic_xn_resampler_16ic_xn
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*
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* \b Overview
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*
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* Resamples a complex vector (16-bit integer each component), providing \p num_out_vectors outputs.
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*
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* <b>Dispatcher Prototype</b>
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* \code
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* void volk_gnsssdr_16ic_xn_resampler_16ic_xn(lv_16sc_t** result, const lv_16sc_t* local_code, float* rem_code_phase_chips, float code_phase_step_chips, float* shifts_chips, unsigned int code_length_chips, int num_out_vectors, unsigned int num_points)
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* \endcode
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*
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* \b Inputs
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* \li local_code: Vector to be resampled.
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* \li rem_code_phase_chips: Remnant code phase [chips].
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* \li code_phase_step_chips: Phase increment per sample [chips/sample].
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* \li shifts_chips: Vector of floats that defines the spacing (in chips) between the replicas of \p local_code
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* \li code_length_chips: Code length in chips.
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* \li num_out_vectors: Number of output vectors.
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* \li num_points: The number of data values to be in the resampled vector.
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*
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* \b Outputs
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* \li result: Pointer to a vector of pointers where the results will be stored.
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*
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*/
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#ifndef INCLUDED_volk_gnsssdr_16ic_xn_resampler_16ic_xn_H
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#define INCLUDED_volk_gnsssdr_16ic_xn_resampler_16ic_xn_H
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#include <volk_gnsssdr/volk_gnsssdr_common.h>
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#include <volk_gnsssdr/volk_gnsssdr_complex.h>
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#include <math.h>
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#include <stdlib.h>
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#ifdef LV_HAVE_GENERIC
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static inline void volk_gnsssdr_16ic_xn_resampler_16ic_xn_generic(lv_16sc_t** result, const lv_16sc_t* local_code, float rem_code_phase_chips, float code_phase_step_chips, float* shifts_chips, unsigned int code_length_chips, int num_out_vectors, unsigned int num_points)
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{
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int local_code_chip_index;
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int current_correlator_tap;
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unsigned int n;
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for (current_correlator_tap = 0U; current_correlator_tap < num_out_vectors; current_correlator_tap++)
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{
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for (n = 0; n < num_points; n++)
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{
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// resample code for current tap
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local_code_chip_index = (int)floor(code_phase_step_chips * (float)n + shifts_chips[current_correlator_tap] - rem_code_phase_chips);
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// Take into account that in multitap correlators, the shifts can be negative!
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if (local_code_chip_index < 0) local_code_chip_index += (int)code_length_chips * (abs(local_code_chip_index) / code_length_chips + 1);
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local_code_chip_index = local_code_chip_index % code_length_chips;
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result[current_correlator_tap][n] = local_code[local_code_chip_index];
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}
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}
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}
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#endif /* LV_HAVE_GENERIC */
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#ifdef LV_HAVE_SSE4_1
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#include <smmintrin.h>
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static inline void volk_gnsssdr_16ic_xn_resampler_16ic_xn_a_sse4_1(lv_16sc_t** result, const lv_16sc_t* local_code, float rem_code_phase_chips, float code_phase_step_chips, float* shifts_chips, unsigned int code_length_chips, int num_out_vectors, unsigned int num_points)
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{
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lv_16sc_t** _result = result;
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const unsigned int quarterPoints = num_points / 4;
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int current_correlator_tap;
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unsigned int n;
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unsigned int k;
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const __m128 fours = _mm_set1_ps(4.0f);
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const __m128 rem_code_phase_chips_reg = _mm_set_ps1(rem_code_phase_chips);
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const __m128 code_phase_step_chips_reg = _mm_set_ps1(code_phase_step_chips);
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__VOLK_ATTR_ALIGNED(16)
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int local_code_chip_index[4];
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int local_code_chip_index_;
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const __m128i zeros = _mm_setzero_si128();
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const __m128 code_length_chips_reg_f = _mm_set_ps1((float)code_length_chips);
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const __m128i code_length_chips_reg_i = _mm_set1_epi32((int)code_length_chips);
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__m128i local_code_chip_index_reg, aux_i, negatives, i;
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__m128 aux, aux2, shifts_chips_reg, c, cTrunc, base;
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for (current_correlator_tap = 0; current_correlator_tap < num_out_vectors; current_correlator_tap++)
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{
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shifts_chips_reg = _mm_set_ps1((float)shifts_chips[current_correlator_tap]);
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aux2 = _mm_sub_ps(shifts_chips_reg, rem_code_phase_chips_reg);
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__m128 indexn = _mm_set_ps(3.0f, 2.0f, 1.0f, 0.0f);
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for (n = 0; n < quarterPoints; n++)
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{
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aux = _mm_mul_ps(code_phase_step_chips_reg, indexn);
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aux = _mm_add_ps(aux, aux2);
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// floor
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aux = _mm_floor_ps(aux);
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// fmod
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c = _mm_div_ps(aux, code_length_chips_reg_f);
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i = _mm_cvttps_epi32(c);
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cTrunc = _mm_cvtepi32_ps(i);
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base = _mm_mul_ps(cTrunc, code_length_chips_reg_f);
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local_code_chip_index_reg = _mm_cvtps_epi32(_mm_sub_ps(aux, base));
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negatives = _mm_cmplt_epi32(local_code_chip_index_reg, zeros);
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aux_i = _mm_and_si128(code_length_chips_reg_i, negatives);
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local_code_chip_index_reg = _mm_add_epi32(local_code_chip_index_reg, aux_i);
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_mm_store_si128((__m128i*)local_code_chip_index, local_code_chip_index_reg);
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for (k = 0; k < 4; ++k)
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{
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_result[current_correlator_tap][n * 4 + k] = local_code[local_code_chip_index[k]];
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}
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indexn = _mm_add_ps(indexn, fours);
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}
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for (n = quarterPoints * 4; n < num_points; n++)
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{
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// resample code for current tap
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local_code_chip_index_ = (int)floor(code_phase_step_chips * (float)n + shifts_chips[current_correlator_tap] - rem_code_phase_chips);
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// Take into account that in multitap correlators, the shifts can be negative!
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if (local_code_chip_index_ < 0) local_code_chip_index_ += (int)code_length_chips * (abs(local_code_chip_index_) / code_length_chips + 1);
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local_code_chip_index_ = local_code_chip_index_ % code_length_chips;
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_result[current_correlator_tap][n] = local_code[local_code_chip_index_];
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}
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}
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}
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#endif
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#ifdef LV_HAVE_SSE4_1
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#include <smmintrin.h>
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static inline void volk_gnsssdr_16ic_xn_resampler_16ic_xn_u_sse4_1(lv_16sc_t** result, const lv_16sc_t* local_code, float rem_code_phase_chips, float code_phase_step_chips, float* shifts_chips, unsigned int code_length_chips, int num_out_vectors, unsigned int num_points)
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{
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lv_16sc_t** _result = result;
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const unsigned int quarterPoints = num_points / 4;
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int current_correlator_tap;
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unsigned int n;
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unsigned int k;
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const __m128 fours = _mm_set1_ps(4.0f);
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const __m128 rem_code_phase_chips_reg = _mm_set_ps1(rem_code_phase_chips);
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const __m128 code_phase_step_chips_reg = _mm_set_ps1(code_phase_step_chips);
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__VOLK_ATTR_ALIGNED(16)
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int local_code_chip_index[4];
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int local_code_chip_index_;
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const __m128i zeros = _mm_setzero_si128();
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const __m128 code_length_chips_reg_f = _mm_set_ps1((float)code_length_chips);
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const __m128i code_length_chips_reg_i = _mm_set1_epi32((int)code_length_chips);
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__m128i local_code_chip_index_reg, aux_i, negatives, i;
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__m128 aux, aux2, shifts_chips_reg, c, cTrunc, base;
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for (current_correlator_tap = 0; current_correlator_tap < num_out_vectors; current_correlator_tap++)
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{
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shifts_chips_reg = _mm_set_ps1((float)shifts_chips[current_correlator_tap]);
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aux2 = _mm_sub_ps(shifts_chips_reg, rem_code_phase_chips_reg);
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__m128 indexn = _mm_set_ps(3.0f, 2.0f, 1.0f, 0.0f);
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for (n = 0; n < quarterPoints; n++)
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{
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aux = _mm_mul_ps(code_phase_step_chips_reg, indexn);
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aux = _mm_add_ps(aux, aux2);
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// floor
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aux = _mm_floor_ps(aux);
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// fmod
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c = _mm_div_ps(aux, code_length_chips_reg_f);
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i = _mm_cvttps_epi32(c);
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cTrunc = _mm_cvtepi32_ps(i);
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base = _mm_mul_ps(cTrunc, code_length_chips_reg_f);
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local_code_chip_index_reg = _mm_cvtps_epi32(_mm_sub_ps(aux, base));
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negatives = _mm_cmplt_epi32(local_code_chip_index_reg, zeros);
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aux_i = _mm_and_si128(code_length_chips_reg_i, negatives);
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local_code_chip_index_reg = _mm_add_epi32(local_code_chip_index_reg, aux_i);
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_mm_store_si128((__m128i*)local_code_chip_index, local_code_chip_index_reg);
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for (k = 0; k < 4; ++k)
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{
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_result[current_correlator_tap][n * 4 + k] = local_code[local_code_chip_index[k]];
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}
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indexn = _mm_add_ps(indexn, fours);
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}
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for (n = quarterPoints * 4; n < num_points; n++)
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{
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// resample code for current tap
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local_code_chip_index_ = (int)floor(code_phase_step_chips * (float)n + shifts_chips[current_correlator_tap] - rem_code_phase_chips);
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// Take into account that in multitap correlators, the shifts can be negative!
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if (local_code_chip_index_ < 0) local_code_chip_index_ += (int)code_length_chips * (abs(local_code_chip_index_) / code_length_chips + 1);
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local_code_chip_index_ = local_code_chip_index_ % code_length_chips;
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_result[current_correlator_tap][n] = local_code[local_code_chip_index_];
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}
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}
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}
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#endif
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#ifdef LV_HAVE_SSE3
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#include <pmmintrin.h>
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static inline void volk_gnsssdr_16ic_xn_resampler_16ic_xn_a_sse3(lv_16sc_t** result, const lv_16sc_t* local_code, float rem_code_phase_chips, float code_phase_step_chips, float* shifts_chips, unsigned int code_length_chips, int num_out_vectors, unsigned int num_points)
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{
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lv_16sc_t** _result = result;
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const unsigned int quarterPoints = num_points / 4;
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int current_correlator_tap;
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unsigned int n;
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unsigned int k;
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const __m128 ones = _mm_set1_ps(1.0f);
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const __m128 fours = _mm_set1_ps(4.0f);
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const __m128 rem_code_phase_chips_reg = _mm_set_ps1(rem_code_phase_chips);
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const __m128 code_phase_step_chips_reg = _mm_set_ps1(code_phase_step_chips);
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__VOLK_ATTR_ALIGNED(16)
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int local_code_chip_index[4];
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int local_code_chip_index_;
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const __m128i zeros = _mm_setzero_si128();
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const __m128 code_length_chips_reg_f = _mm_set_ps1((float)code_length_chips);
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const __m128i code_length_chips_reg_i = _mm_set1_epi32((int)code_length_chips);
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__m128i local_code_chip_index_reg, aux_i, negatives, i;
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__m128 aux, aux2, shifts_chips_reg, fi, igx, j, c, cTrunc, base;
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for (current_correlator_tap = 0; current_correlator_tap < num_out_vectors; current_correlator_tap++)
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{
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shifts_chips_reg = _mm_set_ps1((float)shifts_chips[current_correlator_tap]);
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aux2 = _mm_sub_ps(shifts_chips_reg, rem_code_phase_chips_reg);
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__m128 indexn = _mm_set_ps(3.0f, 2.0f, 1.0f, 0.0f);
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for (n = 0; n < quarterPoints; n++)
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{
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aux = _mm_mul_ps(code_phase_step_chips_reg, indexn);
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aux = _mm_add_ps(aux, aux2);
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// floor
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i = _mm_cvttps_epi32(aux);
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fi = _mm_cvtepi32_ps(i);
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igx = _mm_cmpgt_ps(fi, aux);
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j = _mm_and_ps(igx, ones);
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aux = _mm_sub_ps(fi, j);
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// fmod
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c = _mm_div_ps(aux, code_length_chips_reg_f);
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i = _mm_cvttps_epi32(c);
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cTrunc = _mm_cvtepi32_ps(i);
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base = _mm_mul_ps(cTrunc, code_length_chips_reg_f);
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local_code_chip_index_reg = _mm_cvtps_epi32(_mm_sub_ps(aux, base));
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negatives = _mm_cmplt_epi32(local_code_chip_index_reg, zeros);
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aux_i = _mm_and_si128(code_length_chips_reg_i, negatives);
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local_code_chip_index_reg = _mm_add_epi32(local_code_chip_index_reg, aux_i);
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_mm_store_si128((__m128i*)local_code_chip_index, local_code_chip_index_reg);
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for (k = 0; k < 4; ++k)
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{
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_result[current_correlator_tap][n * 4 + k] = local_code[local_code_chip_index[k]];
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}
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indexn = _mm_add_ps(indexn, fours);
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}
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for (n = quarterPoints * 4; n < num_points; n++)
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{
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// resample code for current tap
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local_code_chip_index_ = (int)floor(code_phase_step_chips * (float)n + shifts_chips[current_correlator_tap] - rem_code_phase_chips);
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// Take into account that in multitap correlators, the shifts can be negative!
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if (local_code_chip_index_ < 0) local_code_chip_index_ += (int)code_length_chips * (abs(local_code_chip_index_) / code_length_chips + 1);
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local_code_chip_index_ = local_code_chip_index_ % code_length_chips;
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_result[current_correlator_tap][n] = local_code[local_code_chip_index_];
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}
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}
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}
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#endif
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#ifdef LV_HAVE_SSE3
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#include <pmmintrin.h>
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static inline void volk_gnsssdr_16ic_xn_resampler_16ic_xn_u_sse3(lv_16sc_t** result, const lv_16sc_t* local_code, float rem_code_phase_chips, float code_phase_step_chips, float* shifts_chips, unsigned int code_length_chips, int num_out_vectors, unsigned int num_points)
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{
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lv_16sc_t** _result = result;
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const unsigned int quarterPoints = num_points / 4;
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int current_correlator_tap;
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unsigned int n;
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unsigned int k;
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const __m128 ones = _mm_set1_ps(1.0f);
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const __m128 fours = _mm_set1_ps(4.0f);
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const __m128 rem_code_phase_chips_reg = _mm_set_ps1(rem_code_phase_chips);
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const __m128 code_phase_step_chips_reg = _mm_set_ps1(code_phase_step_chips);
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__VOLK_ATTR_ALIGNED(16)
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int local_code_chip_index[4];
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int local_code_chip_index_;
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const __m128i zeros = _mm_setzero_si128();
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const __m128 code_length_chips_reg_f = _mm_set_ps1((float)code_length_chips);
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const __m128i code_length_chips_reg_i = _mm_set1_epi32((int)code_length_chips);
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__m128i local_code_chip_index_reg, aux_i, negatives, i;
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__m128 aux, aux2, shifts_chips_reg, fi, igx, j, c, cTrunc, base;
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for (current_correlator_tap = 0; current_correlator_tap < num_out_vectors; current_correlator_tap++)
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{
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shifts_chips_reg = _mm_set_ps1((float)shifts_chips[current_correlator_tap]);
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aux2 = _mm_sub_ps(shifts_chips_reg, rem_code_phase_chips_reg);
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__m128 indexn = _mm_set_ps(3.0f, 2.0f, 1.0f, 0.0f);
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for (n = 0; n < quarterPoints; n++)
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{
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aux = _mm_mul_ps(code_phase_step_chips_reg, indexn);
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aux = _mm_add_ps(aux, aux2);
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// floor
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i = _mm_cvttps_epi32(aux);
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fi = _mm_cvtepi32_ps(i);
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igx = _mm_cmpgt_ps(fi, aux);
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j = _mm_and_ps(igx, ones);
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aux = _mm_sub_ps(fi, j);
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// fmod
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c = _mm_div_ps(aux, code_length_chips_reg_f);
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i = _mm_cvttps_epi32(c);
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cTrunc = _mm_cvtepi32_ps(i);
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base = _mm_mul_ps(cTrunc, code_length_chips_reg_f);
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local_code_chip_index_reg = _mm_cvtps_epi32(_mm_sub_ps(aux, base));
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negatives = _mm_cmplt_epi32(local_code_chip_index_reg, zeros);
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aux_i = _mm_and_si128(code_length_chips_reg_i, negatives);
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local_code_chip_index_reg = _mm_add_epi32(local_code_chip_index_reg, aux_i);
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_mm_store_si128((__m128i*)local_code_chip_index, local_code_chip_index_reg);
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for (k = 0; k < 4; ++k)
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{
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_result[current_correlator_tap][n * 4 + k] = local_code[local_code_chip_index[k]];
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}
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indexn = _mm_add_ps(indexn, fours);
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}
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for (n = quarterPoints * 4; n < num_points; n++)
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{
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// resample code for current tap
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local_code_chip_index_ = (int)floor(code_phase_step_chips * (float)n + shifts_chips[current_correlator_tap] - rem_code_phase_chips);
|
|
// Take into account that in multitap correlators, the shifts can be negative!
|
|
if (local_code_chip_index_ < 0) local_code_chip_index_ += (int)code_length_chips * (abs(local_code_chip_index_) / code_length_chips + 1);
|
|
local_code_chip_index_ = local_code_chip_index_ % code_length_chips;
|
|
_result[current_correlator_tap][n] = local_code[local_code_chip_index_];
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
#ifdef LV_HAVE_AVX
|
|
#include <immintrin.h>
|
|
static inline void volk_gnsssdr_16ic_xn_resampler_16ic_xn_a_avx(lv_16sc_t** result, const lv_16sc_t* local_code, float rem_code_phase_chips, float code_phase_step_chips, float* shifts_chips, unsigned int code_length_chips, int num_out_vectors, unsigned int num_points)
|
|
{
|
|
lv_16sc_t** _result = result;
|
|
const unsigned int avx_iters = num_points / 8;
|
|
int current_correlator_tap;
|
|
unsigned int n;
|
|
unsigned int k;
|
|
const __m256 eights = _mm256_set1_ps(8.0f);
|
|
const __m256 rem_code_phase_chips_reg = _mm256_set1_ps(rem_code_phase_chips);
|
|
const __m256 code_phase_step_chips_reg = _mm256_set1_ps(code_phase_step_chips);
|
|
|
|
__VOLK_ATTR_ALIGNED(32)
|
|
int local_code_chip_index[8];
|
|
int local_code_chip_index_;
|
|
|
|
const __m256 zeros = _mm256_setzero_ps();
|
|
const __m256 code_length_chips_reg_f = _mm256_set1_ps((float)code_length_chips);
|
|
const __m256 n0 = _mm256_set_ps(7.0f, 6.0f, 5.0f, 4.0f, 3.0f, 2.0f, 1.0f, 0.0f);
|
|
|
|
__m256i local_code_chip_index_reg, i;
|
|
__m256 aux, aux2, aux3, shifts_chips_reg, c, cTrunc, base, negatives, indexn;
|
|
|
|
for (current_correlator_tap = 0; current_correlator_tap < num_out_vectors; current_correlator_tap++)
|
|
{
|
|
shifts_chips_reg = _mm256_set1_ps((float)shifts_chips[current_correlator_tap]);
|
|
aux2 = _mm256_sub_ps(shifts_chips_reg, rem_code_phase_chips_reg);
|
|
indexn = n0;
|
|
for (n = 0; n < avx_iters; n++)
|
|
{
|
|
__VOLK_GNSSSDR_PREFETCH_LOCALITY(&_result[current_correlator_tap][8 * n + 7], 1, 0);
|
|
__VOLK_GNSSSDR_PREFETCH_LOCALITY(&local_code_chip_index[8], 1, 3);
|
|
aux = _mm256_mul_ps(code_phase_step_chips_reg, indexn);
|
|
aux = _mm256_add_ps(aux, aux2);
|
|
// floor
|
|
aux = _mm256_floor_ps(aux);
|
|
|
|
// fmod
|
|
c = _mm256_div_ps(aux, code_length_chips_reg_f);
|
|
i = _mm256_cvttps_epi32(c);
|
|
cTrunc = _mm256_cvtepi32_ps(i);
|
|
base = _mm256_mul_ps(cTrunc, code_length_chips_reg_f);
|
|
local_code_chip_index_reg = _mm256_cvttps_epi32(_mm256_sub_ps(aux, base));
|
|
|
|
// no negatives
|
|
c = _mm256_cvtepi32_ps(local_code_chip_index_reg);
|
|
negatives = _mm256_cmp_ps(c, zeros, 0x01);
|
|
aux3 = _mm256_and_ps(code_length_chips_reg_f, negatives);
|
|
aux = _mm256_add_ps(c, aux3);
|
|
local_code_chip_index_reg = _mm256_cvttps_epi32(aux);
|
|
|
|
_mm256_store_si256((__m256i*)local_code_chip_index, local_code_chip_index_reg);
|
|
for (k = 0; k < 8; ++k)
|
|
{
|
|
_result[current_correlator_tap][n * 8 + k] = local_code[local_code_chip_index[k]];
|
|
}
|
|
indexn = _mm256_add_ps(indexn, eights);
|
|
}
|
|
}
|
|
|
|
for (current_correlator_tap = 0; current_correlator_tap < num_out_vectors; current_correlator_tap++)
|
|
{
|
|
for (n = avx_iters * 8; n < num_points; n++)
|
|
{
|
|
// resample code for current tap
|
|
local_code_chip_index_ = (int)floor(code_phase_step_chips * (float)n + shifts_chips[current_correlator_tap] - rem_code_phase_chips);
|
|
// Take into account that in multitap correlators, the shifts can be negative!
|
|
if (local_code_chip_index_ < 0) local_code_chip_index_ += (int)code_length_chips * (abs(local_code_chip_index_) / code_length_chips + 1);
|
|
local_code_chip_index_ = local_code_chip_index_ % code_length_chips;
|
|
_result[current_correlator_tap][n] = local_code[local_code_chip_index_];
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
#ifdef LV_HAVE_AVX
|
|
#include <immintrin.h>
|
|
static inline void volk_gnsssdr_16ic_xn_resampler_16ic_xn_u_avx(lv_16sc_t** result, const lv_16sc_t* local_code, float rem_code_phase_chips, float code_phase_step_chips, float* shifts_chips, unsigned int code_length_chips, int num_out_vectors, unsigned int num_points)
|
|
{
|
|
lv_16sc_t** _result = result;
|
|
const unsigned int avx_iters = num_points / 8;
|
|
int current_correlator_tap;
|
|
unsigned int n;
|
|
unsigned int k;
|
|
const __m256 eights = _mm256_set1_ps(8.0f);
|
|
const __m256 rem_code_phase_chips_reg = _mm256_set1_ps(rem_code_phase_chips);
|
|
const __m256 code_phase_step_chips_reg = _mm256_set1_ps(code_phase_step_chips);
|
|
|
|
__VOLK_ATTR_ALIGNED(32)
|
|
int local_code_chip_index[8];
|
|
int local_code_chip_index_;
|
|
|
|
const __m256 zeros = _mm256_setzero_ps();
|
|
const __m256 code_length_chips_reg_f = _mm256_set1_ps((float)code_length_chips);
|
|
const __m256 n0 = _mm256_set_ps(7.0f, 6.0f, 5.0f, 4.0f, 3.0f, 2.0f, 1.0f, 0.0f);
|
|
|
|
__m256i local_code_chip_index_reg, i;
|
|
__m256 aux, aux2, aux3, shifts_chips_reg, c, cTrunc, base, negatives, indexn;
|
|
|
|
for (current_correlator_tap = 0; current_correlator_tap < num_out_vectors; current_correlator_tap++)
|
|
{
|
|
shifts_chips_reg = _mm256_set1_ps((float)shifts_chips[current_correlator_tap]);
|
|
aux2 = _mm256_sub_ps(shifts_chips_reg, rem_code_phase_chips_reg);
|
|
indexn = n0;
|
|
for (n = 0; n < avx_iters; n++)
|
|
{
|
|
__VOLK_GNSSSDR_PREFETCH_LOCALITY(&_result[current_correlator_tap][8 * n + 7], 1, 0);
|
|
__VOLK_GNSSSDR_PREFETCH_LOCALITY(&local_code_chip_index[8], 1, 3);
|
|
aux = _mm256_mul_ps(code_phase_step_chips_reg, indexn);
|
|
aux = _mm256_add_ps(aux, aux2);
|
|
// floor
|
|
aux = _mm256_floor_ps(aux);
|
|
|
|
// fmod
|
|
c = _mm256_div_ps(aux, code_length_chips_reg_f);
|
|
i = _mm256_cvttps_epi32(c);
|
|
cTrunc = _mm256_cvtepi32_ps(i);
|
|
base = _mm256_mul_ps(cTrunc, code_length_chips_reg_f);
|
|
local_code_chip_index_reg = _mm256_cvttps_epi32(_mm256_sub_ps(aux, base));
|
|
|
|
// no negatives
|
|
c = _mm256_cvtepi32_ps(local_code_chip_index_reg);
|
|
negatives = _mm256_cmp_ps(c, zeros, 0x01);
|
|
aux3 = _mm256_and_ps(code_length_chips_reg_f, negatives);
|
|
aux = _mm256_add_ps(c, aux3);
|
|
local_code_chip_index_reg = _mm256_cvttps_epi32(aux);
|
|
|
|
_mm256_store_si256((__m256i*)local_code_chip_index, local_code_chip_index_reg);
|
|
for (k = 0; k < 8; ++k)
|
|
{
|
|
_result[current_correlator_tap][n * 8 + k] = local_code[local_code_chip_index[k]];
|
|
}
|
|
indexn = _mm256_add_ps(indexn, eights);
|
|
}
|
|
}
|
|
|
|
for (current_correlator_tap = 0; current_correlator_tap < num_out_vectors; current_correlator_tap++)
|
|
{
|
|
for (n = avx_iters * 8; n < num_points; n++)
|
|
{
|
|
// resample code for current tap
|
|
local_code_chip_index_ = (int)floor(code_phase_step_chips * (float)n + shifts_chips[current_correlator_tap] - rem_code_phase_chips);
|
|
// Take into account that in multitap correlators, the shifts can be negative!
|
|
if (local_code_chip_index_ < 0) local_code_chip_index_ += (int)code_length_chips * (abs(local_code_chip_index_) / code_length_chips + 1);
|
|
local_code_chip_index_ = local_code_chip_index_ % code_length_chips;
|
|
_result[current_correlator_tap][n] = local_code[local_code_chip_index_];
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
#ifdef LV_HAVE_NEON
|
|
#include <arm_neon.h>
|
|
static inline void volk_gnsssdr_16ic_xn_resampler_16ic_xn_neon(lv_16sc_t** result, const lv_16sc_t* local_code, float rem_code_phase_chips, float code_phase_step_chips, float* shifts_chips, unsigned int code_length_chips, int num_out_vectors, unsigned int num_points)
|
|
{
|
|
lv_16sc_t** _result = result;
|
|
const unsigned int neon_iters = num_points / 4;
|
|
const int32x4_t ones = vdupq_n_s32(1);
|
|
const float32x4_t fours = vdupq_n_f32(4.0f);
|
|
const float32x4_t rem_code_phase_chips_reg = vdupq_n_f32(rem_code_phase_chips);
|
|
const float32x4_t code_phase_step_chips_reg = vdupq_n_f32(code_phase_step_chips);
|
|
|
|
__VOLK_ATTR_ALIGNED(16)
|
|
int32_t local_code_chip_index[4];
|
|
int32_t local_code_chip_index_;
|
|
|
|
const int32x4_t zeros = vdupq_n_s32(0);
|
|
const float32x4_t code_length_chips_reg_f = vdupq_n_f32((float)code_length_chips);
|
|
const int32x4_t code_length_chips_reg_i = vdupq_n_s32((int32_t)code_length_chips);
|
|
int32x4_t local_code_chip_index_reg, aux_i, negatives, i;
|
|
float32x4_t aux, aux2, shifts_chips_reg, fi, c, j, cTrunc, base, indexn, reciprocal;
|
|
__VOLK_ATTR_ALIGNED(16)
|
|
const float vec[4] = {0.0f, 1.0f, 2.0f, 3.0f};
|
|
uint32x4_t igx;
|
|
reciprocal = vrecpeq_f32(code_length_chips_reg_f);
|
|
reciprocal = vmulq_f32(vrecpsq_f32(code_length_chips_reg_f, reciprocal), reciprocal);
|
|
reciprocal = vmulq_f32(vrecpsq_f32(code_length_chips_reg_f, reciprocal), reciprocal); // this refinement is required!
|
|
float32x4_t n0 = vld1q_f32((float*)vec);
|
|
int current_correlator_tap;
|
|
unsigned int n;
|
|
unsigned int k;
|
|
for (current_correlator_tap = 0; current_correlator_tap < num_out_vectors; current_correlator_tap++)
|
|
{
|
|
shifts_chips_reg = vdupq_n_f32((float)shifts_chips[current_correlator_tap]);
|
|
aux2 = vsubq_f32(shifts_chips_reg, rem_code_phase_chips_reg);
|
|
indexn = n0;
|
|
for (n = 0; n < neon_iters; n++)
|
|
{
|
|
__VOLK_GNSSSDR_PREFETCH_LOCALITY(&_result[current_correlator_tap][4 * n + 3], 1, 0);
|
|
__VOLK_GNSSSDR_PREFETCH(&local_code_chip_index[4]);
|
|
aux = vmulq_f32(code_phase_step_chips_reg, indexn);
|
|
aux = vaddq_f32(aux, aux2);
|
|
|
|
// floor
|
|
i = vcvtq_s32_f32(aux);
|
|
fi = vcvtq_f32_s32(i);
|
|
igx = vcgtq_f32(fi, aux);
|
|
j = vcvtq_f32_s32(vandq_s32(vreinterpretq_s32_u32(igx), ones));
|
|
aux = vsubq_f32(fi, j);
|
|
|
|
// fmod
|
|
c = vmulq_f32(aux, reciprocal);
|
|
i = vcvtq_s32_f32(c);
|
|
cTrunc = vcvtq_f32_s32(i);
|
|
base = vmulq_f32(cTrunc, code_length_chips_reg_f);
|
|
aux = vsubq_f32(aux, base);
|
|
local_code_chip_index_reg = vcvtq_s32_f32(aux);
|
|
|
|
negatives = vreinterpretq_s32_u32(vcltq_s32(local_code_chip_index_reg, zeros));
|
|
aux_i = vandq_s32(code_length_chips_reg_i, negatives);
|
|
local_code_chip_index_reg = vaddq_s32(local_code_chip_index_reg, aux_i);
|
|
|
|
vst1q_s32((int32_t*)local_code_chip_index, local_code_chip_index_reg);
|
|
|
|
for (k = 0; k < 4; ++k)
|
|
{
|
|
_result[current_correlator_tap][n * 4 + k] = local_code[local_code_chip_index[k]];
|
|
}
|
|
indexn = vaddq_f32(indexn, fours);
|
|
}
|
|
for (n = neon_iters * 4; n < num_points; n++)
|
|
{
|
|
__VOLK_GNSSSDR_PREFETCH_LOCALITY(&_result[current_correlator_tap][n], 1, 0);
|
|
// resample code for current tap
|
|
local_code_chip_index_ = (int)floor(code_phase_step_chips * (float)n + shifts_chips[current_correlator_tap] - rem_code_phase_chips);
|
|
// Take into account that in multitap correlators, the shifts can be negative!
|
|
if (local_code_chip_index_ < 0) local_code_chip_index_ += (int)code_length_chips * (abs(local_code_chip_index_) / code_length_chips + 1);
|
|
local_code_chip_index_ = local_code_chip_index_ % code_length_chips;
|
|
_result[current_correlator_tap][n] = local_code[local_code_chip_index_];
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
#endif
|
|
|
|
|
|
#endif /* INCLUDED_volk_gnsssdr_16ic_xn_resampler_16ic_xn_H */
|