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876d4150aa
Note: template_lvbitx.{cpp,hpp} need to be excluded from the list of
files that clang-format gets applied against.
252 lines
8.1 KiB
C++
252 lines
8.1 KiB
C++
//
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// Copyright 2017 Ettus Research LLC
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// Copyright 2018 Ettus Research, a National Instruments Company
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//
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// SPDX-License-Identifier: GPL-3.0-or-later
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//
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#include "convert_pack_sc12.hpp"
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#include <tmmintrin.h>
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/*
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* Shuffle Orderings - Single 128-bit SSE register
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*
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* 16-bit interleaved I/Q
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* ---------------------------------------
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* | Q3 | I3 | Q2 | I2 | Q1 | I1 | Q0 | I0 | Input
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* ---------------------------------------
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* | 127 0 |
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*
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*
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* 12-bit deinterleaved unpacked I/Q
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* ---------------------------------------
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* | I3 | I2 | I1 | I0 | Q3 | Q2 | Q1 | Q0 | Shuffle-1
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* ---------------------------------------
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* | High bit aligned | 4-bit >> offset |
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*
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*
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* 12-bit interleaved packed I/Q
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* ---------------------------------------
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* |I0|Q0|I1|Q1|I2|Q2|I3|Q3| | Shuffle-2 | Shuffle-3
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* ---------------------------------------
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* | 127 32 | 31 Empty 0 |
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*
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*
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* 12-bit packed I/Q byteswapped
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* -----------------------
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* | I0 | Q0 | I1 | 0
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* |-----------------------|
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* | I1 | Q1 | I2 | Q2 | Output
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* |-----------------------|
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* | Q2 | I3 | Q3 |
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* |-----------------------|
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* | Unused | 3
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* -----------------------
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* 31 0
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*/
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#define SC12_SHIFT_MASK 0xfff0fff0, 0xfff0fff0, 0x0fff0fff, 0x0fff0fff
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#define SC12_PACK_SHUFFLE1 13, 12, 9, 8, 5, 4, 1, 0, 15, 14, 11, 10, 7, 6, 3, 2
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#define SC12_PACK_SHUFFLE2 9, 8, 0, 11, 10, 2, 13, 12, 4, 15, 14, 6, 0, 0, 0, 0
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#define SC12_PACK_SHUFFLE3 8, 1, 8, 8, 3, 8, 8, 5, 8, 8, 7, 8, 8, 8, 8, 8
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template <typename type>
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inline void convert_star_4_to_sc12_item32_3(const std::complex<type>* in,
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item32_sc12_3x& output,
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const double scalar,
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typename std::enable_if<std::is_same<type, float>::value>::type* = NULL)
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{
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__m128 m0, m1, m2;
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m0 = _mm_set1_ps(scalar);
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m1 = _mm_loadu_ps((const float*)&in[0]);
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m2 = _mm_loadu_ps((const float*)&in[2]);
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m1 = _mm_mul_ps(m1, m0);
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m2 = _mm_mul_ps(m2, m0);
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m0 = _mm_shuffle_ps(m1, m2, _MM_SHUFFLE(2, 0, 2, 0));
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m1 = _mm_shuffle_ps(m1, m2, _MM_SHUFFLE(3, 1, 3, 1));
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__m128i m3, m4, m5, m6, m7;
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m3 = _mm_set_epi32(SC12_SHIFT_MASK);
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m4 = _mm_set_epi8(SC12_PACK_SHUFFLE2);
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m5 = _mm_set_epi8(SC12_PACK_SHUFFLE3);
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m6 = _mm_cvtps_epi32(m0);
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m7 = _mm_cvtps_epi32(m1);
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m6 = _mm_slli_epi32(m6, 4);
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m6 = _mm_packs_epi32(m7, m6);
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m6 = _mm_and_si128(m6, m3);
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m7 = _mm_move_epi64(m6);
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m6 = _mm_shuffle_epi8(m6, m4);
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m7 = _mm_shuffle_epi8(m7, m5);
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m6 = _mm_or_si128(m6, m7);
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m6 = _mm_shuffle_epi32(m6, _MM_SHUFFLE(0, 1, 2, 3));
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_mm_storeu_si128((__m128i*)&output, m6);
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}
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template <typename type>
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static void convert_star_4_to_sc12_item32_3(const std::complex<type>* in,
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item32_sc12_3x& output,
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const double,
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typename std::enable_if<std::is_same<type, short>::value>::type* = NULL)
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{
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__m128i m0, m1, m2, m3, m4, m5;
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m0 = _mm_set_epi32(SC12_SHIFT_MASK);
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m1 = _mm_set_epi8(SC12_PACK_SHUFFLE1);
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m2 = _mm_set_epi8(SC12_PACK_SHUFFLE2);
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m3 = _mm_set_epi8(SC12_PACK_SHUFFLE3);
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m4 = _mm_loadu_si128((__m128i*)in);
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m4 = _mm_shuffle_epi8(m4, m1);
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m5 = _mm_srli_epi16(m4, 4);
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m4 = _mm_shuffle_epi32(m4, _MM_SHUFFLE(0, 0, 3, 2));
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m4 = _mm_unpacklo_epi64(m5, m4);
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m4 = _mm_and_si128(m4, m0);
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m5 = _mm_move_epi64(m4);
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m4 = _mm_shuffle_epi8(m4, m2);
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m5 = _mm_shuffle_epi8(m5, m3);
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m3 = _mm_or_si128(m4, m5);
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m3 = _mm_shuffle_epi32(m3, _MM_SHUFFLE(0, 1, 2, 3));
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_mm_storeu_si128((__m128i*)&output, m3);
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}
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template <typename type, towire32_type towire>
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struct convert_star_1_to_sc12_item32_2 : public converter
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{
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convert_star_1_to_sc12_item32_2(void) : _scalar(0.0) {}
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void set_scalar(const double scalar)
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{
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_scalar = scalar;
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}
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void operator()(
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const input_type& inputs, const output_type& outputs, const size_t nsamps)
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{
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const std::complex<type>* input =
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reinterpret_cast<const std::complex<type>*>(inputs[0]);
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const size_t head_samps = size_t(outputs[0]) & 0x3;
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int enable;
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size_t rewind = 0;
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switch (head_samps) {
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case 0:
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break;
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case 1:
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rewind = 9;
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break;
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case 2:
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rewind = 6;
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break;
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case 3:
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rewind = 3;
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break;
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}
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item32_sc12_3x* output =
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reinterpret_cast<item32_sc12_3x*>(size_t(outputs[0]) - rewind);
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// helper variables
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size_t i = 0, o = 0;
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// handle the head case
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switch (head_samps) {
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case 0:
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break; // no head
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case 1:
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enable = CONVERT12_LINE2;
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convert_star_4_to_sc12_item32_3<type, towire>(
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0, 0, 0, input[0], enable, output[o++], _scalar);
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break;
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case 2:
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enable = CONVERT12_LINE2 | CONVERT12_LINE1;
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convert_star_4_to_sc12_item32_3<type, towire>(
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0, 0, input[0], input[1], enable, output[o++], _scalar);
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break;
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case 3:
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enable = CONVERT12_LINE2 | CONVERT12_LINE1 | CONVERT12_LINE0;
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convert_star_4_to_sc12_item32_3<type, towire>(
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0, input[0], input[1], input[2], enable, output[o++], _scalar);
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break;
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}
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i += head_samps;
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// SSE packed write output is 16 bytes which overwrites the 12-bit
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// packed struct by 4 bytes. There is no concern if there are
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// subsequent samples to be converted (writes will simply happen
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// twice). So set the conversion loop to force a tail case on the
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// final 4 or fewer samples.
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while (i + 4 < nsamps) {
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convert_star_4_to_sc12_item32_3<type>(&input[i], output[o], _scalar);
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o++;
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i += 4;
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}
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// handle the tail case
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const size_t tail_samps = nsamps - i;
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switch (tail_samps) {
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case 0:
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break; // no tail
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case 1:
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enable = CONVERT12_LINE0;
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convert_star_4_to_sc12_item32_3<type, towire>(
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input[i + 0], 0, 0, 0, enable, output[o], _scalar);
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break;
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case 2:
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enable = CONVERT12_LINE0 | CONVERT12_LINE1;
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convert_star_4_to_sc12_item32_3<type, towire>(
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input[i + 0], input[i + 1], 0, 0, enable, output[o], _scalar);
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break;
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case 3:
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enable = CONVERT12_LINE0 | CONVERT12_LINE1 | CONVERT12_LINE2;
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convert_star_4_to_sc12_item32_3<type, towire>(input[i + 0],
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input[i + 1],
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input[i + 2],
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0,
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enable,
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output[o],
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_scalar);
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break;
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case 4:
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enable = CONVERT12_LINE_ALL;
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convert_star_4_to_sc12_item32_3<type, towire>(input[i + 0],
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input[i + 1],
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input[i + 2],
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input[i + 3],
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enable,
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output[o],
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_scalar);
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break;
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}
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}
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double _scalar;
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};
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static converter::sptr make_convert_fc32_1_to_sc12_item32_le_1(void)
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{
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return converter::sptr(new convert_star_1_to_sc12_item32_2<float, uhd::wtohx>());
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}
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static converter::sptr make_convert_sc16_1_to_sc12_item32_le_1(void)
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{
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return converter::sptr(new convert_star_1_to_sc12_item32_2<short, uhd::wtohx>());
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}
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UHD_STATIC_BLOCK(register_sse_pack_sc12)
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{
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uhd::convert::id_type id;
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id.num_inputs = 1;
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id.num_outputs = 1;
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id.input_format = "fc32";
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id.output_format = "sc12_item32_le";
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uhd::convert::register_converter(
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id, &make_convert_fc32_1_to_sc12_item32_le_1, PRIORITY_SIMD);
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id.input_format = "sc16";
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id.output_format = "sc12_item32_le";
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uhd::convert::register_converter(
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id, &make_convert_sc16_1_to_sc12_item32_le_1, PRIORITY_SIMD);
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}
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