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//
// Copyright 2011-2012 Ettus Research LLC
// Copyright 2018 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: GPL-3.0-or-later
//
#include "convert_common.hpp"
#include <uhd/utils/byteswap.hpp>
#include <emmintrin.h>
using namespace uhd::convert;
DECLARE_CONVERTER(sc16_item32_le, 1, fc32, 1, PRIORITY_SIMD)
{
const item32_t* input = reinterpret_cast<const item32_t*>(inputs[0]);
fc32_t* output = reinterpret_cast<fc32_t*>(outputs[0]);
const __m128 scalar = _mm_set_ps1(float(scale_factor) / (1 << 16));
const __m128i zeroi = _mm_setzero_si128();
// this macro converts values faster by using SSE intrinsics to convert 4 values at a time
#define convert_item32_1_to_fc32_1_nswap_guts(_al_) \
for (; i + 3 < nsamps; i += 4) { \
/* load from input */ \
__m128i tmpi = _mm_loadu_si128(reinterpret_cast<const __m128i*>(input + i)); \
\
/* unpack + swap 16-bit pairs */ \
tmpi = _mm_shufflelo_epi16(tmpi, _MM_SHUFFLE(2, 3, 0, 1)); \
tmpi = _mm_shufflehi_epi16(tmpi, _MM_SHUFFLE(2, 3, 0, 1)); \
__m128i tmpilo = _mm_unpacklo_epi16(zeroi, tmpi); /* value in upper 16 bits */ \
__m128i tmpihi = _mm_unpackhi_epi16(zeroi, tmpi); \
\
/* convert and scale */ \
__m128 tmplo = _mm_mul_ps(_mm_cvtepi32_ps(tmpilo), scalar); \
__m128 tmphi = _mm_mul_ps(_mm_cvtepi32_ps(tmpihi), scalar); \
\
/* store to output */ \
_mm_store##_al_##ps(reinterpret_cast<float*>(output + i + 0), tmplo); \
_mm_store##_al_##ps(reinterpret_cast<float*>(output + i + 2), tmphi); \
}
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_item32_1_to_fc32_1_nswap_guts(_) break;
case 0x8:
// 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, 1, scale_factor);
i++;
// do faster processing of the bulk of the samples now that we are 16-byte
// aligned
convert_item32_1_to_fc32_1_nswap_guts(_) break;
default:
// we are not 8 or 16-byte aligned, so do fast processing with the unaligned
// load and store
convert_item32_1_to_fc32_1_nswap_guts(u_)
}
// convert any remaining samples
item32_sc16_to_xx<uhd::htowx>(input + i, output + i, nsamps - i, scale_factor);
}
DECLARE_CONVERTER(sc16_item32_be, 1, fc32, 1, PRIORITY_SIMD)
{
const item32_t* input = reinterpret_cast<const item32_t*>(inputs[0]);
fc32_t* output = reinterpret_cast<fc32_t*>(outputs[0]);
const __m128 scalar = _mm_set_ps1(float(scale_factor) / (1 << 16));
const __m128i zeroi = _mm_setzero_si128();
// this macro converts values faster by using SSE intrinsics to convert 4 values at a time
#define convert_item32_1_to_fc32_1_bswap_guts(_al_) \
for (; i + 3 < nsamps; i += 4) { \
/* load from input */ \
__m128i tmpi = _mm_loadu_si128(reinterpret_cast<const __m128i*>(input + i)); \
\
/* byteswap + unpack -> byteswap 16 bit words */ \
tmpi = _mm_or_si128(_mm_srli_epi16(tmpi, 8), _mm_slli_epi16(tmpi, 8)); \
__m128i tmpilo = _mm_unpacklo_epi16(zeroi, tmpi); /* value in upper 16 bits */ \
__m128i tmpihi = _mm_unpackhi_epi16(zeroi, tmpi); \
\
/* convert and scale */ \
__m128 tmplo = _mm_mul_ps(_mm_cvtepi32_ps(tmpilo), scalar); \
__m128 tmphi = _mm_mul_ps(_mm_cvtepi32_ps(tmpihi), scalar); \
\
/* store to output */ \
_mm_store##_al_##ps(reinterpret_cast<float*>(output + i + 0), tmplo); \
_mm_store##_al_##ps(reinterpret_cast<float*>(output + i + 2), tmphi); \
}
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_item32_1_to_fc32_1_bswap_guts(_) break;
case 0x8:
// 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, 1, scale_factor);
i++;
// do faster processing of the bulk of the samples now that we are 16-byte
// aligned
convert_item32_1_to_fc32_1_bswap_guts(_) break;
default:
// we are not 8 or 16-byte aligned, so do fast processing with the unaligned
// load and store
convert_item32_1_to_fc32_1_bswap_guts(u_)
}
// convert any remaining samples
item32_sc16_to_xx<uhd::htonx>(input + i, output + i, nsamps - i, scale_factor);
}
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