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Add AVX implementation

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Carles Fernandez 2018-08-09 22:00:22 +02:00
parent c5f10cd56c
commit 66bfbffe89
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2 changed files with 238 additions and 214 deletions
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120
src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/kernels/volk_gnsssdr/volk_gnsssdr_32f_fast_resamplerxnpuppet_32f.h
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@ -71,9 +71,9 @@ static inline void volk_gnsssdr_32f_fast_resamplerxnpuppet_32f_generic(float* re
volk_gnsssdr_free(result_aux); volk_gnsssdr_free(result_aux);
} }
#endif /* LV_HAVE_GENERIC */ #endif /* LV_HAVE_GENERIC */
#ifdef LV_HAVE_SSE3 #ifdef LV_HAVE_SSE3
static inline void volk_gnsssdr_32f_fast_resamplerxnpuppet_32f_a_sse3(float* result, const float* local_code, unsigned int num_points) static inline void volk_gnsssdr_32f_fast_resamplerxnpuppet_32f_a_sse3(float* result, const float* local_code, unsigned int num_points)
{ {
@ -104,6 +104,7 @@ static inline void volk_gnsssdr_32f_fast_resamplerxnpuppet_32f_a_sse3(float* res
#endif #endif
#ifdef LV_HAVE_SSE3 #ifdef LV_HAVE_SSE3
static inline void volk_gnsssdr_32f_fast_resamplerxnpuppet_32f_u_sse3(float* result, const float* local_code, unsigned int num_points) static inline void volk_gnsssdr_32f_fast_resamplerxnpuppet_32f_u_sse3(float* result, const float* local_code, unsigned int num_points)
{ {
@ -195,63 +196,66 @@ static inline void volk_gnsssdr_32f_fast_resamplerxnpuppet_32f_a_sse4_1(float* r
} }
#endif #endif
//
//#ifdef LV_HAVE_AVX
//static inline void volk_gnsssdr_32f_resamplerxnpuppet_32f_a_avx(float* result, const float* local_code, unsigned int num_points) #ifdef LV_HAVE_AVX
//{ static inline void volk_gnsssdr_32f_fast_resamplerxnpuppet_32f_a_avx(float* result, const float* local_code, unsigned int num_points)
// int code_length_chips = 2046; {
// float code_phase_step_chips = ((float)(code_length_chips) + 0.1) / ((float)num_points); int code_length_chips = 2046;
// int num_out_vectors = 3; float code_phase_step_chips = ((float)(code_length_chips) + 0.1) / ((float)num_points);
// float rem_code_phase_chips = -0.234; int num_out_vectors = 3;
// unsigned int n; float rem_code_phase_chips = -0.8234;
// float shifts_chips[3] = {-0.1, 0.0, 0.1}; float code_phase_rate_step_chips = 1.0 / powf(2.0, 33.0);
// unsigned int n;
// float** result_aux = (float**)volk_gnsssdr_malloc(sizeof(float*) * num_out_vectors, volk_gnsssdr_get_alignment()); float shifts_chips[3] = {-0.1, 0.0, 0.1};
// for (n = 0; n < num_out_vectors; n++)
// { float** result_aux = (float**)volk_gnsssdr_malloc(sizeof(float*) * num_out_vectors, volk_gnsssdr_get_alignment());
// result_aux[n] = (float*)volk_gnsssdr_malloc(sizeof(float) * num_points, volk_gnsssdr_get_alignment()); for (n = 0; n < num_out_vectors; n++)
// } {
// result_aux[n] = (float*)volk_gnsssdr_malloc(sizeof(float) * num_points, volk_gnsssdr_get_alignment());
// volk_gnsssdr_32f_xn_resampler_32f_xn_a_avx(result_aux, local_code, rem_code_phase_chips, code_phase_step_chips, shifts_chips, code_length_chips, num_out_vectors, num_points); }
//
// memcpy((float*)result, (float*)result_aux[0], sizeof(float) * num_points); volk_gnsssdr_32f_xn_fast_resampler_32f_xn_a_avx(result_aux, local_code, rem_code_phase_chips, code_phase_step_chips, code_phase_rate_step_chips, shifts_chips, code_length_chips, num_out_vectors, num_points);
//
// for (n = 0; n < num_out_vectors; n++) memcpy((float*)result, (float*)result_aux[0], sizeof(float) * num_points);
// {
// volk_gnsssdr_free(result_aux[n]); for (n = 0; n < num_out_vectors; n++)
// } {
// volk_gnsssdr_free(result_aux); volk_gnsssdr_free(result_aux[n]);
//} }
//#endif volk_gnsssdr_free(result_aux);
// }
// #endif
//#ifdef LV_HAVE_AVX
//static inline void volk_gnsssdr_32f_resamplerxnpuppet_32f_u_avx(float* result, const float* local_code, unsigned int num_points)
//{ #ifdef LV_HAVE_AVX
// int code_length_chips = 2046; static inline void volk_gnsssdr_32f_fast_resamplerxnpuppet_32f_u_avx(float* result, const float* local_code, unsigned int num_points)
// float code_phase_step_chips = ((float)(code_length_chips) + 0.1) / ((float)num_points); {
// int num_out_vectors = 3; int code_length_chips = 2046;
// float rem_code_phase_chips = -0.234; float code_phase_step_chips = ((float)(code_length_chips) + 0.1) / ((float)num_points);
// unsigned int n; int num_out_vectors = 3;
// float shifts_chips[3] = {-0.1, 0.0, 0.1}; float rem_code_phase_chips = -0.8234;
// float code_phase_rate_step_chips = 1.0 / powf(2.0, 33.0);
// float** result_aux = (float**)volk_gnsssdr_malloc(sizeof(float*) * num_out_vectors, volk_gnsssdr_get_alignment()); unsigned int n;
// for (n = 0; n < num_out_vectors; n++) float shifts_chips[3] = {-0.1, 0.0, 0.1};
// {
// result_aux[n] = (float*)volk_gnsssdr_malloc(sizeof(float) * num_points, volk_gnsssdr_get_alignment()); float** result_aux = (float**)volk_gnsssdr_malloc(sizeof(float*) * num_out_vectors, volk_gnsssdr_get_alignment());
// } for (n = 0; n < num_out_vectors; n++)
// {
// volk_gnsssdr_32f_xn_resampler_32f_xn_u_avx(result_aux, local_code, rem_code_phase_chips, code_phase_step_chips, shifts_chips, code_length_chips, num_out_vectors, num_points); result_aux[n] = (float*)volk_gnsssdr_malloc(sizeof(float) * num_points, volk_gnsssdr_get_alignment());
// }
// memcpy((float*)result, (float*)result_aux[0], sizeof(float) * num_points);
// volk_gnsssdr_32f_xn_fast_resampler_32f_xn_u_avx(result_aux, local_code, rem_code_phase_chips, code_phase_step_chips, code_phase_rate_step_chips, shifts_chips, code_length_chips, num_out_vectors, num_points);
// for (n = 0; n < num_out_vectors; n++)
// { memcpy((float*)result, (float*)result_aux[0], sizeof(float) * num_points);
// volk_gnsssdr_free(result_aux[n]);
// } for (n = 0; n < num_out_vectors; n++)
// volk_gnsssdr_free(result_aux); {
//} volk_gnsssdr_free(result_aux[n]);
//#endif }
volk_gnsssdr_free(result_aux);
}
#endif
// //
//#ifdef LV_HAVE_NEONV7 //#ifdef LV_HAVE_NEONV7
//static inline void volk_gnsssdr_32f_resamplerxnpuppet_32f_neon(float* result, const float* local_code, unsigned int num_points) //static inline void volk_gnsssdr_32f_resamplerxnpuppet_32f_neon(float* result, const float* local_code, unsigned int num_points)

332
src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/kernels/volk_gnsssdr/volk_gnsssdr_32f_xn_fast_resampler_32f_xn.h
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@ -440,162 +440,182 @@ static inline void volk_gnsssdr_32f_xn_fast_resampler_32f_xn_u_sse4_1(float** re
} }
#endif #endif
//
//
//#ifdef LV_HAVE_AVX #ifdef LV_HAVE_AVX
//#include <immintrin.h> #include <immintrin.h>
//static inline void volk_gnsssdr_32f_xn_fast_resampler_32f_xn_a_avx(float** result, const float* 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) static inline void volk_gnsssdr_32f_xn_fast_resampler_32f_xn_a_avx(float** result, const float* local_code, float rem_code_phase_chips, float code_phase_step_chips, float code_phase_rate_step_chips, float* shifts_chips, unsigned int code_length_chips, int num_out_vectors, unsigned int num_points)
//{ {
// float** _result = result; float** _result = result;
// const unsigned int avx_iters = num_points / 8; const unsigned int avx_iters = num_points / 8;
// int current_correlator_tap; int current_correlator_tap;
// unsigned int n; unsigned int n;
// unsigned int k; unsigned int k;
// const __m256 eights = _mm256_set1_ps(8.0f); const __m256 eights = _mm256_set1_ps(8.0f);
// const __m256 rem_code_phase_chips_reg = _mm256_set1_ps(rem_code_phase_chips); const __m256 ones = _mm256_set1_ps(1.0f);
// const __m256 code_phase_step_chips_reg = _mm256_set1_ps(code_phase_step_chips); 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) const __m256 code_phase_rate_step_chips_reg = _mm256_set1_ps(code_phase_rate_step_chips);
// int local_code_chip_index[8];
// int local_code_chip_index_; __VOLK_ATTR_ALIGNED(32)
// int local_code_chip_index[8];
// const __m256 zeros = _mm256_setzero_ps(); int local_code_chip_index_;
// 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); const __m256 zeros = _mm256_setzero_ps();
// const __m256 code_length_chips_reg_f = _mm256_set1_ps((float)code_length_chips);
// __m256i local_code_chip_index_reg, i; const __m256 n0 = _mm256_set_ps(7.0f, 6.0f, 5.0f, 4.0f, 3.0f, 2.0f, 1.0f, 0.0f);
// __m256 aux, aux2, aux3, shifts_chips_reg, c, cTrunc, base, negatives, indexn;
// __m256i local_code_chip_index_reg, i;
// for (current_correlator_tap = 0; current_correlator_tap < num_out_vectors; current_correlator_tap++) __m256 aux, aux2, aux3, shifts_chips_reg, c, cTrunc, base, negatives, indexn, indexnn;
// {
// shifts_chips_reg = _mm256_set1_ps((float)shifts_chips[current_correlator_tap]); shifts_chips_reg = _mm256_set1_ps((float)shifts_chips[0]);
// aux2 = _mm256_sub_ps(shifts_chips_reg, rem_code_phase_chips_reg); aux2 = _mm256_sub_ps(shifts_chips_reg, rem_code_phase_chips_reg);
// indexn = n0; indexn = n0;
// for (n = 0; n < avx_iters; n++) for (n = 0; n < avx_iters; n++)
// { {
// __VOLK_GNSSSDR_PREFETCH_LOCALITY(&_result[current_correlator_tap][8 * n + 7], 1, 0); __VOLK_GNSSSDR_PREFETCH_LOCALITY(&_result[0][8 * n + 7], 1, 0);
// __VOLK_GNSSSDR_PREFETCH_LOCALITY(&local_code_chip_index[8], 1, 3); __VOLK_GNSSSDR_PREFETCH_LOCALITY(&local_code_chip_index[8], 1, 3);
// aux = _mm256_mul_ps(code_phase_step_chips_reg, indexn); aux = _mm256_mul_ps(code_phase_step_chips_reg, indexn);
// aux = _mm256_add_ps(aux, aux2); indexnn = _mm256_mul_ps(indexn, indexn);
// // floor aux3 = _mm256_mul_ps(code_phase_rate_step_chips_reg, indexnn);
// aux = _mm256_floor_ps(aux); aux = _mm256_add_ps(aux, aux3);
// aux = _mm256_add_ps(aux, aux2);
// // fmod // floor
// c = _mm256_div_ps(aux, code_length_chips_reg_f); aux = _mm256_floor_ps(aux);
// i = _mm256_cvttps_epi32(c);
// cTrunc = _mm256_cvtepi32_ps(i); // Correct negative shift
// base = _mm256_mul_ps(cTrunc, code_length_chips_reg_f); c = _mm256_div_ps(aux, code_length_chips_reg_f);
// local_code_chip_index_reg = _mm256_cvttps_epi32(_mm256_sub_ps(aux, base)); aux3 = _mm256_add_ps(c, ones);
// i = _mm256_cvttps_epi32(aux3);
// // no negatives cTrunc = _mm256_cvtepi32_ps(i);
// c = _mm256_cvtepi32_ps(local_code_chip_index_reg); base = _mm256_mul_ps(cTrunc, code_length_chips_reg_f);
// negatives = _mm256_cmp_ps(c, zeros, 0x01); local_code_chip_index_reg = _mm256_cvttps_epi32(_mm256_sub_ps(aux, base));
// aux3 = _mm256_and_ps(code_length_chips_reg_f, negatives);
// aux = _mm256_add_ps(c, aux3); c = _mm256_cvtepi32_ps(local_code_chip_index_reg);
// local_code_chip_index_reg = _mm256_cvttps_epi32(aux); negatives = _mm256_cmp_ps(c, zeros, 0x01);
// aux3 = _mm256_and_ps(code_length_chips_reg_f, negatives);
// _mm256_store_si256((__m256i*)local_code_chip_index, local_code_chip_index_reg); aux = _mm256_add_ps(c, aux3);
// for (k = 0; k < 8; ++k) local_code_chip_index_reg = _mm256_cvttps_epi32(aux);
// {
// _result[current_correlator_tap][n * 8 + k] = local_code[local_code_chip_index[k]]; _mm256_store_si256((__m256i*)local_code_chip_index, local_code_chip_index_reg);
// } for (k = 0; k < 8; ++k)
// indexn = _mm256_add_ps(indexn, eights); {
// } _result[0][n * 8 + k] = local_code[local_code_chip_index[k]];
// } }
// _mm256_zeroupper(); 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++) _mm256_zeroupper();
// {
// // resample code for current tap for (n = avx_iters * 8; n < num_points; n++)
// 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! // resample code for first tap
// 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_ = (int)floor(code_phase_step_chips * (float)n + code_phase_rate_step_chips * (float)(n * n) + shifts_chips[0] - rem_code_phase_chips);
// local_code_chip_index_ = local_code_chip_index_ % code_length_chips; // Take into account that in multitap correlators, the shifts can be negative!
// _result[current_correlator_tap][n] = local_code[local_code_chip_index_]; 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[0][n] = local_code[local_code_chip_index_];
//} }
//
//#endif // adjacent correlators
// unsigned int shift_samples = 0;
// for (current_correlator_tap = 1; current_correlator_tap < num_out_vectors; current_correlator_tap++)
//#ifdef LV_HAVE_AVX {
//#include <immintrin.h> shift_samples += (int)round((shifts_chips[current_correlator_tap] - shifts_chips[current_correlator_tap - 1]) / code_phase_step_chips);
//static inline void volk_gnsssdr_32f_xn_fast_resampler_32f_xn_u_avx(float** result, const float* 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) memcpy(&_result[current_correlator_tap][0], &_result[0][shift_samples], (num_points - shift_samples) * sizeof(float));
//{ memcpy(&_result[current_correlator_tap][num_points - shift_samples], &_result[0][0], shift_samples * sizeof(float));
// float** _result = result; }
// const unsigned int avx_iters = num_points / 8; }
// int current_correlator_tap;
// unsigned int n; #endif
// 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); #ifdef LV_HAVE_AVX
// const __m256 code_phase_step_chips_reg = _mm256_set1_ps(code_phase_step_chips); #include <immintrin.h>
// static inline void volk_gnsssdr_32f_xn_fast_resampler_32f_xn_u_avx(float** result, const float* local_code, float rem_code_phase_chips, float code_phase_step_chips, float code_phase_rate_step_chips, float* shifts_chips, unsigned int code_length_chips, int num_out_vectors, unsigned int num_points)
// __VOLK_ATTR_ALIGNED(32) {
// int local_code_chip_index[8]; float** _result = result;
// int local_code_chip_index_; const unsigned int avx_iters = num_points / 8;
// int current_correlator_tap;
// const __m256 zeros = _mm256_setzero_ps(); unsigned int n;
// const __m256 code_length_chips_reg_f = _mm256_set1_ps((float)code_length_chips); unsigned int k;
// const __m256 n0 = _mm256_set_ps(7.0f, 6.0f, 5.0f, 4.0f, 3.0f, 2.0f, 1.0f, 0.0f); const __m256 eights = _mm256_set1_ps(8.0f);
// const __m256 ones = _mm256_set1_ps(1.0f);
// __m256i local_code_chip_index_reg, i; const __m256 rem_code_phase_chips_reg = _mm256_set1_ps(rem_code_phase_chips);
// __m256 aux, aux2, aux3, shifts_chips_reg, c, cTrunc, base, negatives, indexn; const __m256 code_phase_step_chips_reg = _mm256_set1_ps(code_phase_step_chips);
// const __m256 code_phase_rate_step_chips_reg = _mm256_set1_ps(code_phase_rate_step_chips);
// for (current_correlator_tap = 0; current_correlator_tap < num_out_vectors; current_correlator_tap++)
// { __VOLK_ATTR_ALIGNED(32)
// shifts_chips_reg = _mm256_set1_ps((float)shifts_chips[current_correlator_tap]); int local_code_chip_index[8];
// aux2 = _mm256_sub_ps(shifts_chips_reg, rem_code_phase_chips_reg); int local_code_chip_index_;
// indexn = n0;
// for (n = 0; n < avx_iters; n++) const __m256 zeros = _mm256_setzero_ps();
// { const __m256 code_length_chips_reg_f = _mm256_set1_ps((float)code_length_chips);
// __VOLK_GNSSSDR_PREFETCH_LOCALITY(&_result[current_correlator_tap][8 * n + 7], 1, 0); const __m256 n0 = _mm256_set_ps(7.0f, 6.0f, 5.0f, 4.0f, 3.0f, 2.0f, 1.0f, 0.0f);
// __VOLK_GNSSSDR_PREFETCH_LOCALITY(&local_code_chip_index[8], 1, 3);
// aux = _mm256_mul_ps(code_phase_step_chips_reg, indexn); __m256i local_code_chip_index_reg, i;
// aux = _mm256_add_ps(aux, aux2); __m256 aux, aux2, aux3, shifts_chips_reg, c, cTrunc, base, negatives, indexn, indexnn;
// // floor
// aux = _mm256_floor_ps(aux); shifts_chips_reg = _mm256_set1_ps((float)shifts_chips[0]);
// aux2 = _mm256_sub_ps(shifts_chips_reg, rem_code_phase_chips_reg);
// // fmod indexn = n0;
// c = _mm256_div_ps(aux, code_length_chips_reg_f); for (n = 0; n < avx_iters; n++)
// i = _mm256_cvttps_epi32(c); {
// cTrunc = _mm256_cvtepi32_ps(i); __VOLK_GNSSSDR_PREFETCH_LOCALITY(&_result[0][8 * n + 7], 1, 0);
// base = _mm256_mul_ps(cTrunc, code_length_chips_reg_f); __VOLK_GNSSSDR_PREFETCH_LOCALITY(&local_code_chip_index[8], 1, 3);
// local_code_chip_index_reg = _mm256_cvttps_epi32(_mm256_sub_ps(aux, base)); aux = _mm256_mul_ps(code_phase_step_chips_reg, indexn);
// indexnn = _mm256_mul_ps(indexn, indexn);
// // no negatives aux3 = _mm256_mul_ps(code_phase_rate_step_chips_reg, indexnn);
// c = _mm256_cvtepi32_ps(local_code_chip_index_reg); aux = _mm256_add_ps(aux, aux3);
// negatives = _mm256_cmp_ps(c, zeros, 0x01); aux = _mm256_add_ps(aux, aux2);
// aux3 = _mm256_and_ps(code_length_chips_reg_f, negatives); // floor
// aux = _mm256_add_ps(c, aux3); aux = _mm256_floor_ps(aux);
// local_code_chip_index_reg = _mm256_cvttps_epi32(aux);
// // Correct negative shift
// _mm256_store_si256((__m256i*)local_code_chip_index, local_code_chip_index_reg); c = _mm256_div_ps(aux, code_length_chips_reg_f);
// for (k = 0; k < 8; ++k) aux3 = _mm256_add_ps(c, ones);
// { i = _mm256_cvttps_epi32(aux3);
// _result[current_correlator_tap][n * 8 + k] = local_code[local_code_chip_index[k]]; cTrunc = _mm256_cvtepi32_ps(i);
// } base = _mm256_mul_ps(cTrunc, code_length_chips_reg_f);
// indexn = _mm256_add_ps(indexn, eights); local_code_chip_index_reg = _mm256_cvttps_epi32(_mm256_sub_ps(aux, base));
// }
// } c = _mm256_cvtepi32_ps(local_code_chip_index_reg);
// _mm256_zeroupper(); negatives = _mm256_cmp_ps(c, zeros, 0x01);
// for (current_correlator_tap = 0; current_correlator_tap < num_out_vectors; current_correlator_tap++) aux3 = _mm256_and_ps(code_length_chips_reg_f, negatives);
// { aux = _mm256_add_ps(c, aux3);
// for (n = avx_iters * 8; n < num_points; n++) local_code_chip_index_reg = _mm256_cvttps_epi32(aux);
// {
// // resample code for current tap _mm256_store_si256((__m256i*)local_code_chip_index, local_code_chip_index_reg);
// local_code_chip_index_ = (int)floor(code_phase_step_chips * (float)n + shifts_chips[current_correlator_tap] - rem_code_phase_chips); for (k = 0; k < 8; ++k)
// //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); _result[0][n * 8 + k] = local_code[local_code_chip_index[k]];
// local_code_chip_index_ = local_code_chip_index_ % code_length_chips; }
// _result[current_correlator_tap][n] = local_code[local_code_chip_index_]; indexn = _mm256_add_ps(indexn, eights);
// } }
// }
//} _mm256_zeroupper();
//
//#endif for (n = avx_iters * 8; n < num_points; n++)
{
// resample code for first tap
local_code_chip_index_ = (int)floor(code_phase_step_chips * (float)n + code_phase_rate_step_chips * (float)(n * n) + shifts_chips[0] - 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[0][n] = local_code[local_code_chip_index_];
}
// adjacent correlators
unsigned int shift_samples = 0;
for (current_correlator_tap = 1; current_correlator_tap < num_out_vectors; current_correlator_tap++)
{
shift_samples += (int)round((shifts_chips[current_correlator_tap] - shifts_chips[current_correlator_tap - 1]) / code_phase_step_chips);
memcpy(&_result[current_correlator_tap][0], &_result[0][shift_samples], (num_points - shift_samples) * sizeof(float));
memcpy(&_result[current_correlator_tap][num_points - shift_samples], &_result[0][0], shift_samples * sizeof(float));
}
}
#endif
// //
// //
//#ifdef LV_HAVE_NEONV7 //#ifdef LV_HAVE_NEONV7