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//
// Copyright 2015 Ettus Research LLC
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
#include "convert_common.hpp"
#include <uhd/utils/byteswap.hpp>
#include <emmintrin.h>
using namespace uhd::convert;
//
// SSE 16-bit pair swap
//
// Valid alignment macro arguments are 'u_' and '_' for unaligned and aligned
// access respectively. Macro operates on 4 complex 16-bit integers at a time.
//
// -----------------
// | A | B | C | D | Input
// -----------------
// 0 1 2 3 Address
// -----------------
// | C | D | A | B | Output
// -----------------
//
#define CONVERT_SC16_1_TO_SC16_1_NSWAP_GUTS(_ialign_,_oalign_) \
for (; i+3 < nsamps; i+=4) { \
__m128i m0; \
\
/* load from input */ \
m0 = _mm_load ## _ialign_ ## si128((const __m128i *) (input+i));\
\
/* swap 16-bit pairs */ \
m0 = _mm_shufflelo_epi16(m0, _MM_SHUFFLE(2, 3, 0, 1)); \
m0 = _mm_shufflehi_epi16(m0, _MM_SHUFFLE(2, 3, 0, 1)); \
\
/* store to output */ \
_mm_store ## _oalign_ ## si128((__m128i *) (output+i), m0); \
} \
//
// SSE byte swap
//
// Valid alignment macro arguments are 'u_' and '_' for unaligned and aligned
// access respectively. Macro operates on 4 complex 16-bit integers at a time.
//
// -----------------
// | A | B | C | D | Input
// -----------------
// 0 1 2 3 Address
// -----------------
// | B | A | D | C | Output
// -----------------
//
#define CONVERT_SC16_1_TO_SC16_1_BSWAP_GUTS(_ialign_,_oalign_) \
for (; i+3 < nsamps; i+=4) { \
__m128i m0, m1, m2; \
\
/* load from input */ \
m0 = _mm_load ## _ialign_ ## si128((const __m128i *) (input+i));\
\
/* byteswap 16 bit words */ \
m1 = _mm_srli_epi16(m0, 8); \
m2 = _mm_slli_epi16(m0, 8); \
m0 = _mm_or_si128(m1, m2); \
\
/* store to output */ \
_mm_store ## _oalign_ ## si128((__m128i *) (output+i), m0); \
} \
DECLARE_CONVERTER(sc16, 1, sc16_item32_le, 1, PRIORITY_SIMD){
const sc16_t *input = reinterpret_cast<const sc16_t *>(inputs[0]);
item32_t *output = reinterpret_cast<item32_t *>(outputs[0]);
size_t i = 0;
// need to dispatch according to alignment for fastest conversion
switch (size_t(input) & 0xf){
case 0x0:
// the data is 16-byte aligned, so do the fast processing of the bulk of the samples
CONVERT_SC16_1_TO_SC16_1_NSWAP_GUTS(_,u_)
break;
case 0x8:
if (nsamps < 2)
break;
// the first sample is 8-byte aligned - process it to align the remainder of the samples to 16-bytes
xx_to_item32_sc16<uhd::htowx>(input, output, 2, 1.0);
i += 2;
CONVERT_SC16_1_TO_SC16_1_NSWAP_GUTS(_,u_)
// do faster processing of the bulk of the samples now that we are 16-byte aligned
break;
default:
// we are not 8 or 16-byte aligned, so do fast processing with the unaligned load
CONVERT_SC16_1_TO_SC16_1_NSWAP_GUTS(u_,u_)
}
// convert any remaining samples
xx_to_item32_sc16<uhd::htowx>(input+i, output+i, nsamps-i, 1.0);
}
DECLARE_CONVERTER(sc16, 1, sc16_item32_be, 1, PRIORITY_SIMD){
const sc16_t *input = reinterpret_cast<const sc16_t *>(inputs[0]);
item32_t *output = reinterpret_cast<item32_t *>(outputs[0]);
size_t i = 0;
// need to dispatch according to alignment for fastest conversion
switch (size_t(input) & 0xf){
case 0x0:
// the data is 16-byte aligned, so do the fast processing of the bulk of the samples
CONVERT_SC16_1_TO_SC16_1_BSWAP_GUTS(_,u_)
break;
case 0x8:
if (nsamps < 2)
break;
// the first value is 8-byte aligned - process it and prepare the bulk of the data for fast conversion
xx_to_item32_sc16<uhd::htonx>(input, output, 2, 1.0);
i += 2;
// do faster processing of the remaining samples now that we are 16-byte aligned
CONVERT_SC16_1_TO_SC16_1_BSWAP_GUTS(_,u_)
break;
default:
// we are not 8 or 16-byte aligned, so do fast processing with the unaligned load
CONVERT_SC16_1_TO_SC16_1_BSWAP_GUTS(u_,u_)
}
// convert any remaining samples
xx_to_item32_sc16<uhd::htonx>(input+i, output+i, nsamps-i, 1.0);
}
DECLARE_CONVERTER(sc16_item32_le, 1, sc16, 1, PRIORITY_SIMD){
const item32_t *input = reinterpret_cast<const item32_t *>(inputs[0]);
sc16_t *output = reinterpret_cast<sc16_t *>(outputs[0]);
size_t i = 0;
// need to dispatch according to alignment for fastest conversion
switch (size_t(output) & 0xf){
case 0x0:
// the data is 16-byte aligned, so do the fast processing of the bulk of the samples
CONVERT_SC16_1_TO_SC16_1_NSWAP_GUTS(u_,_)
break;
case 0x8:
if (nsamps < 2)
break;
// the first sample is 8-byte aligned - process it to align the remainder of the samples to 16-bytes
item32_sc16_to_xx<uhd::htowx>(input, output, 2, 1.0);
i += 2;
// do faster processing of the bulk of the samples now that we are 16-byte aligned
CONVERT_SC16_1_TO_SC16_1_NSWAP_GUTS(u_,_)
break;
default:
// we are not 8 or 16-byte aligned, so do fast processing with the unaligned load and store
CONVERT_SC16_1_TO_SC16_1_NSWAP_GUTS(u_,u_)
}
// convert any remaining samples
item32_sc16_to_xx<uhd::htowx>(input+i, output+i, nsamps-i, 1.0);
}
DECLARE_CONVERTER(sc16_item32_be, 1, sc16, 1, PRIORITY_SIMD){
const item32_t *input = reinterpret_cast<const item32_t *>(inputs[0]);
sc16_t *output = reinterpret_cast<sc16_t *>(outputs[0]);
size_t i = 0;
// need to dispatch according to alignment for fastest conversion
switch (size_t(output) & 0xf){
case 0x0:
// the data is 16-byte aligned, so do the fast processing of the bulk of the samples
CONVERT_SC16_1_TO_SC16_1_BSWAP_GUTS(u_,_)
break;
case 0x8:
if (nsamps < 2)
break;
// the first sample is 8-byte aligned - process it to align the remainder of the samples to 16-bytes
item32_sc16_to_xx<uhd::htonx>(input, output, 2, 1.0);
i += 2;
// do faster processing of the bulk of the samples now that we are 16-byte aligned
CONVERT_SC16_1_TO_SC16_1_BSWAP_GUTS(u_,_)
break;
default:
// we are not 8 or 16-byte aligned, so do fast processing with the unaligned load and store
CONVERT_SC16_1_TO_SC16_1_BSWAP_GUTS(u_,u_)
}
// convert any remaining samples
item32_sc16_to_xx<uhd::htonx>(input+i, output+i, nsamps-i, 1.0);
}
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