uhd/host/lib/convert/sse2_fc32_to_sc16.cpp

//
// Copyright 2011-2012 Ettus Research LLC
// Copyright 2018 Ettus Research, a National Instruments Company
// Copyright 2019 Ettus Research, a National Instruments Brand
//
// 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(fc32, 1, sc16_item32_le, 1, PRIORITY_SIMD)
{
    const fc32_t* input = reinterpret_cast<const fc32_t*>(inputs[0]);
    item32_t* output    = reinterpret_cast<item32_t*>(outputs[0]);

    const __m128 scalar = _mm_set_ps1(float(scale_factor));

// this macro converts values faster by using SSE intrinsics to convert 4 values at a time
#define convert_fc32_1_to_item32_1_nswap_guts(_al_)                            \
    for (; i + 3 < nsamps; i += 4) {                                           \
        /* load from input */                                                  \
        __m128 tmplo =                                                         \
            _mm_load##_al_##ps(reinterpret_cast<const float*>(input + i + 0)); \
        __m128 tmphi =                                                         \
            _mm_load##_al_##ps(reinterpret_cast<const float*>(input + i + 2)); \
                                                                               \
        /* convert and scale */                                                \
        __m128i tmpilo = _mm_cvtps_epi32(_mm_mul_ps(tmplo, scalar));           \
        __m128i tmpihi = _mm_cvtps_epi32(_mm_mul_ps(tmphi, scalar));           \
                                                                               \
        /* pack + swap 16-bit pairs */                                         \
        __m128i tmpi = _mm_packs_epi32(tmpilo, tmpihi);                        \
        tmpi         = _mm_shufflelo_epi16(tmpi, _MM_SHUFFLE(2, 3, 0, 1));     \
        tmpi         = _mm_shufflehi_epi16(tmpi, _MM_SHUFFLE(2, 3, 0, 1));     \
                                                                               \
        /* store to output */                                                  \
        _mm_storeu_si128(reinterpret_cast<__m128i*>(output + i), tmpi);        \
    }

    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_fc32_1_to_item32_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
            xx_to_item32_sc16<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_fc32_1_to_item32_1_nswap_guts(_) break;
        default:
            // we are not 8 or 16-byte aligned, so do fast processing with the unaligned
            // load
            convert_fc32_1_to_item32_1_nswap_guts(u_)
    }

    // convert any remaining samples
    xx_to_item32_sc16<uhd::htowx>(input + i, output + i, nsamps - i, scale_factor);
}

DECLARE_CONVERTER(fc32, 1, sc16_item32_be, 1, PRIORITY_SIMD)
{
    const fc32_t* input = reinterpret_cast<const fc32_t*>(inputs[0]);
    item32_t* output    = reinterpret_cast<item32_t*>(outputs[0]);

    const __m128 scalar = _mm_set_ps1(float(scale_factor));

// this macro converts values faster by using SSE intrinsics to convert 4 values at a time
#define convert_fc32_1_to_item32_1_bswap_guts(_al_)                                    \
    for (; i + 3 < nsamps; i += 4) {                                                   \
        /* load from input */                                                          \
        __m128 tmplo =                                                                 \
            _mm_load##_al_##ps(reinterpret_cast<const float*>(input + i + 0));         \
        __m128 tmphi =                                                                 \
            _mm_load##_al_##ps(reinterpret_cast<const float*>(input + i + 2));         \
                                                                                       \
        /* convert and scale */                                                        \
        __m128i tmpilo = _mm_cvtps_epi32(_mm_mul_ps(tmplo, scalar));                   \
        __m128i tmpihi = _mm_cvtps_epi32(_mm_mul_ps(tmphi, scalar));                   \
                                                                                       \
        /* pack + byteswap -> byteswap 16 bit words */                                 \
        __m128i tmpi = _mm_packs_epi32(tmpilo, tmpihi);                                \
        tmpi         = _mm_or_si128(_mm_srli_epi16(tmpi, 8), _mm_slli_epi16(tmpi, 8)); \
                                                                                       \
        /* store to output */                                                          \
        _mm_storeu_si128(reinterpret_cast<__m128i*>(output + i), tmpi);                \
    }

    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_fc32_1_to_item32_1_bswap_guts(_) break;
        case 0x8:
            // 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, 1, scale_factor);
            i++;
            // do faster processing of the remaining samples now that we are 16-byte
            // aligned
            convert_fc32_1_to_item32_1_bswap_guts(_) break;
        default:
            // we are not 8 or 16-byte aligned, so do fast processing with the unaligned
            // load
            convert_fc32_1_to_item32_1_bswap_guts(u_)
    }

    // convert any remaining samples
    xx_to_item32_sc16<uhd::htonx>(input + i, output + i, nsamps - i, scale_factor);
}

DECLARE_CONVERTER(fc32, 1, sc16_chdr, 1, PRIORITY_SIMD)
{
    const fc32_t* input = reinterpret_cast<const fc32_t*>(inputs[0]);
    sc16_t* output      = reinterpret_cast<sc16_t*>(outputs[0]);

    const __m128 scalar = _mm_set_ps1(float(scale_factor));

// this macro converts values faster by using SSE intrinsics to convert 4 values at a time
#define convert_fc32_1_to_item32_1_guts(_al_)                                  \
    for (; i + 3 < nsamps; i += 4) {                                           \
        /* load from input */                                                  \
        __m128 tmplo =                                                         \
            _mm_load##_al_##ps(reinterpret_cast<const float*>(input + i + 0)); \
        __m128 tmphi =                                                         \
            _mm_load##_al_##ps(reinterpret_cast<const float*>(input + i + 2)); \
                                                                               \
        /* convert and scale */                                                \
        __m128i tmpilo = _mm_cvtps_epi32(_mm_mul_ps(tmplo, scalar));           \
        __m128i tmpihi = _mm_cvtps_epi32(_mm_mul_ps(tmphi, scalar));           \
                                                                               \
        /* pack from 32 bit integers to 16 bit */                              \
        __m128i tmpi = _mm_packs_epi32(tmpilo, tmpihi);                        \
                                                                               \
        /* store to output */                                                  \
        _mm_storeu_si128(reinterpret_cast<__m128i*>(output + i), tmpi);        \
    }

    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_fc32_1_to_item32_1_guts(_) break;
        case 0x8:
            // the first sample is 8-byte aligned - process it to align the remainder of
            // the samples to 16-bytes
            xx_to_chdr_sc16(input, output, 1, scale_factor);
            i++;
            // do faster processing of the bulk of the samples now that we are 16-byte
            // aligned
            convert_fc32_1_to_item32_1_guts(_) break;
        default:
            // we are not 8 or 16-byte aligned, so do fast processing with the unaligned
            // load
            convert_fc32_1_to_item32_1_guts(u_)
    }

    // convert any remaining samples
    xx_to_chdr_sc16(input + i, output + i, nsamps - i, scale_factor);
}