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8d4bdd57bf
The sc16-sc16 wire to host type converter is effectively an I/Q swap
or 16-bit byteswap for little and big endian cases respectively. This
implmentation is a subset of fc32 and fc64 converters without the
floating point portion and scaling.
The resulting byte ordering is as follows:
-----------------
| A | B | C | D | Wire
-----------------
0 1 2 3
-----------------
| C | D | A | B | Litte-endian
-----------------
0 1 2 3
-----------------
| B | A | D | C | Big-endian
-----------------
0 1 2 3
Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
201 lines
8.2 KiB
C++
201 lines
8.2 KiB
C++
//
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// Copyright 2015 Ettus Research LLC
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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, either 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 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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#include "convert_common.hpp"
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#include <uhd/utils/byteswap.hpp>
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#include <emmintrin.h>
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using namespace uhd::convert;
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//
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// SSE 16-bit pair swap
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//
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// Valid alignment macro arguments are 'u_' and '_' for unaligned and aligned
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// access respectively. Macro operates on 4 complex 16-bit integers at a time.
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//
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// -----------------
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// | A | B | C | D | Input
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// -----------------
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// 0 1 2 3 Address
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// -----------------
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// | C | D | A | B | Output
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// -----------------
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//
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#define CONVERT_SC16_1_TO_SC16_1_NSWAP_GUTS(_ialign_,_oalign_) \
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for (; i+3 < nsamps; i+=4) { \
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__m128i m0; \
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\
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/* load from input */ \
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m0 = _mm_load ## _ialign_ ## si128((const __m128i *) (input+i));\
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\
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/* swap 16-bit pairs */ \
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m0 = _mm_shufflelo_epi16(m0, _MM_SHUFFLE(2, 3, 0, 1)); \
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m0 = _mm_shufflehi_epi16(m0, _MM_SHUFFLE(2, 3, 0, 1)); \
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\
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/* store to output */ \
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_mm_store ## _oalign_ ## si128((__m128i *) (output+i), m0); \
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} \
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//
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// SSE byte swap
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//
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// Valid alignment macro arguments are 'u_' and '_' for unaligned and aligned
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// access respectively. Macro operates on 4 complex 16-bit integers at a time.
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//
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// -----------------
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// | A | B | C | D | Input
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// -----------------
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// 0 1 2 3 Address
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// -----------------
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// | B | A | D | C | Output
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// -----------------
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//
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#define CONVERT_SC16_1_TO_SC16_1_BSWAP_GUTS(_ialign_,_oalign_) \
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for (; i+3 < nsamps; i+=4) { \
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__m128i m0, m1, m2; \
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\
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/* load from input */ \
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m0 = _mm_load ## _ialign_ ## si128((const __m128i *) (input+i));\
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\
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/* byteswap 16 bit words */ \
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m1 = _mm_srli_epi16(m0, 8); \
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m2 = _mm_slli_epi16(m0, 8); \
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m0 = _mm_or_si128(m1, m2); \
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\
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/* store to output */ \
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_mm_store ## _oalign_ ## si128((__m128i *) (output+i), m0); \
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} \
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DECLARE_CONVERTER(sc16, 1, sc16_item32_le, 1, PRIORITY_SIMD){
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const sc16_t *input = reinterpret_cast<const sc16_t *>(inputs[0]);
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item32_t *output = reinterpret_cast<item32_t *>(outputs[0]);
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size_t i = 0;
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// need to dispatch according to alignment for fastest conversion
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switch (size_t(input) & 0xf){
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case 0x0:
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// the data is 16-byte aligned, so do the fast processing of the bulk of the samples
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CONVERT_SC16_1_TO_SC16_1_NSWAP_GUTS(_,u_)
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break;
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case 0x8:
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if (nsamps < 2)
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break;
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// the first sample is 8-byte aligned - process it to align the remainder of the samples to 16-bytes
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xx_to_item32_sc16<uhd::htowx>(input, output, 2, 1.0);
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i += 2;
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CONVERT_SC16_1_TO_SC16_1_NSWAP_GUTS(_,u_)
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// do faster processing of the bulk of the samples now that we are 16-byte aligned
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break;
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default:
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// we are not 8 or 16-byte aligned, so do fast processing with the unaligned load
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CONVERT_SC16_1_TO_SC16_1_NSWAP_GUTS(u_,u_)
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}
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// convert any remaining samples
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xx_to_item32_sc16<uhd::htowx>(input+i, output+i, nsamps-i, 1.0);
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}
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DECLARE_CONVERTER(sc16, 1, sc16_item32_be, 1, PRIORITY_SIMD){
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const sc16_t *input = reinterpret_cast<const sc16_t *>(inputs[0]);
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item32_t *output = reinterpret_cast<item32_t *>(outputs[0]);
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size_t i = 0;
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// need to dispatch according to alignment for fastest conversion
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switch (size_t(input) & 0xf){
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case 0x0:
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// the data is 16-byte aligned, so do the fast processing of the bulk of the samples
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CONVERT_SC16_1_TO_SC16_1_BSWAP_GUTS(_,u_)
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break;
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case 0x8:
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if (nsamps < 2)
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break;
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// the first value is 8-byte aligned - process it and prepare the bulk of the data for fast conversion
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xx_to_item32_sc16<uhd::htonx>(input, output, 2, 1.0);
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i += 2;
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// do faster processing of the remaining samples now that we are 16-byte aligned
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CONVERT_SC16_1_TO_SC16_1_BSWAP_GUTS(_,u_)
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break;
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default:
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// we are not 8 or 16-byte aligned, so do fast processing with the unaligned load
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CONVERT_SC16_1_TO_SC16_1_BSWAP_GUTS(u_,u_)
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}
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// convert any remaining samples
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xx_to_item32_sc16<uhd::htonx>(input+i, output+i, nsamps-i, 1.0);
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}
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DECLARE_CONVERTER(sc16_item32_le, 1, sc16, 1, PRIORITY_SIMD){
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const item32_t *input = reinterpret_cast<const item32_t *>(inputs[0]);
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sc16_t *output = reinterpret_cast<sc16_t *>(outputs[0]);
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size_t i = 0;
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// need to dispatch according to alignment for fastest conversion
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switch (size_t(output) & 0xf){
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case 0x0:
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// the data is 16-byte aligned, so do the fast processing of the bulk of the samples
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CONVERT_SC16_1_TO_SC16_1_NSWAP_GUTS(u_,_)
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break;
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case 0x8:
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if (nsamps < 2)
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break;
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// the first sample is 8-byte aligned - process it to align the remainder of the samples to 16-bytes
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item32_sc16_to_xx<uhd::htowx>(input, output, 2, 1.0);
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i += 2;
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// do faster processing of the bulk of the samples now that we are 16-byte aligned
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CONVERT_SC16_1_TO_SC16_1_NSWAP_GUTS(u_,_)
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break;
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default:
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// we are not 8 or 16-byte aligned, so do fast processing with the unaligned load and store
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CONVERT_SC16_1_TO_SC16_1_NSWAP_GUTS(u_,u_)
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}
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// convert any remaining samples
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item32_sc16_to_xx<uhd::htowx>(input+i, output+i, nsamps-i, 1.0);
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}
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DECLARE_CONVERTER(sc16_item32_be, 1, sc16, 1, PRIORITY_SIMD){
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const item32_t *input = reinterpret_cast<const item32_t *>(inputs[0]);
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sc16_t *output = reinterpret_cast<sc16_t *>(outputs[0]);
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size_t i = 0;
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// need to dispatch according to alignment for fastest conversion
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switch (size_t(output) & 0xf){
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case 0x0:
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// the data is 16-byte aligned, so do the fast processing of the bulk of the samples
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CONVERT_SC16_1_TO_SC16_1_BSWAP_GUTS(u_,_)
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break;
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case 0x8:
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if (nsamps < 2)
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break;
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// the first sample is 8-byte aligned - process it to align the remainder of the samples to 16-bytes
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item32_sc16_to_xx<uhd::htonx>(input, output, 2, 1.0);
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i += 2;
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// do faster processing of the bulk of the samples now that we are 16-byte aligned
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CONVERT_SC16_1_TO_SC16_1_BSWAP_GUTS(u_,_)
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break;
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default:
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// we are not 8 or 16-byte aligned, so do fast processing with the unaligned load and store
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CONVERT_SC16_1_TO_SC16_1_BSWAP_GUTS(u_,u_)
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}
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// convert any remaining samples
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item32_sc16_to_xx<uhd::htonx>(input+i, output+i, nsamps-i, 1.0);
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}
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