uhd

//

// Copyright 2010 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/>.

//

#ifndef INCLUDED_LIBUHD_TRANSPORT_CONVERT_TYPES_IMPL_HPP

#define INCLUDED_LIBUHD_TRANSPORT_CONVERT_TYPES_IMPL_HPP

#include <uhd/config.hpp>

#include <uhd/utils/byteswap.hpp>

#include <boost/cstdint.hpp>

#include <cstring>

#include <complex>

#ifdef HAVE_EMMINTRIN_H

    #define USE_EMMINTRIN_H //use sse2 intrinsics

#endif

#if defined(USE_EMMINTRIN_H)

    #include <emmintrin.h>

#endif

/***********************************************************************

 * Typedefs

 **********************************************************************/

typedef std::complex<float>          fc32_t;

typedef std::complex<boost::int16_t> sc16_t;

typedef boost::uint32_t              item32_t;

/***********************************************************************

 * Convert complex short buffer to items32

 **********************************************************************/

static UHD_INLINE void sc16_to_item32_nswap(

    const sc16_t *input, item32_t *output, size_t nsamps

){

    std::memcpy(output, input, nsamps*sizeof(item32_t));

}

static UHD_INLINE void sc16_to_item32_bswap(

    const sc16_t *input, item32_t *output, size_t nsamps

){

    const item32_t *item32_input = (const item32_t *)input;

    for (size_t i = 0; i < nsamps; i++){

        output[i] = uhd::byteswap(item32_input[i]);

    }

}

/***********************************************************************

 * Convert items32 buffer to complex short

 **********************************************************************/

static UHD_INLINE void item32_to_sc16_nswap(

    const item32_t *input, sc16_t *output, size_t nsamps

){

    std::memcpy(output, input, nsamps*sizeof(item32_t));

}

static UHD_INLINE void item32_to_sc16_bswap(

    const item32_t *input, sc16_t *output, size_t nsamps

){

    item32_t *item32_output = (item32_t *)output;

    for (size_t i = 0; i < nsamps; i++){

        item32_output[i] = uhd::byteswap(input[i]);

    }

}

/***********************************************************************

 * Convert complex float buffer to items32 (no swap)

 **********************************************************************/

static const float shorts_per_float = float(32767);

static UHD_INLINE item32_t fc32_to_item32(fc32_t num){

    boost::uint16_t real = boost::int16_t(num.real()*shorts_per_float);

    boost::uint16_t imag = boost::int16_t(num.imag()*shorts_per_float);

    return (item32_t(real) << 16) | (item32_t(imag) << 0);

}

////////////////////////////////////

// none-swap

////////////////////////////////////

#if defined(USE_EMMINTRIN_H)

static UHD_INLINE void fc32_to_item32_nswap(

    const fc32_t *input, item32_t *output, size_t nsamps

){

    __m128 scalar = _mm_set_ps1(shorts_per_float);

    //convert blocks of samples with intrinsics

    size_t i = 0; for (; i < (nsamps & ~0x3); i+=4){

        //load from input

        __m128 tmplo = _mm_loadu_ps(reinterpret_cast<const float *>(input+i+0));

        __m128 tmphi = _mm_loadu_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);

    }

    //convert remainder

    for (; i < nsamps; i++){

        output[i] = fc32_to_item32(input[i]);

    }

}

#else

static UHD_INLINE void fc32_to_item32_nswap(

    const fc32_t *input, item32_t *output, size_t nsamps

){

    for (size_t i = 0; i < nsamps; i++){

        output[i] = fc32_to_item32(input[i]);

    }

}

#endif

////////////////////////////////////

// byte-swap

////////////////////////////////////

#if defined(USE_EMMINTRIN_H)

static UHD_INLINE void fc32_to_item32_bswap(

    const fc32_t *input, item32_t *output, size_t nsamps

){

    __m128 scalar = _mm_set_ps1(shorts_per_float);

    //convert blocks of samples with intrinsics

    size_t i = 0; for (; i < (nsamps & ~0x3); i+=4){

        //load from input

        __m128 tmplo = _mm_loadu_ps(reinterpret_cast<const float *>(input+i+0));

        __m128 tmphi = _mm_loadu_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);

    }

    //convert remainder

    for (; i < nsamps; i++){

        output[i] = uhd::byteswap(fc32_to_item32(input[i]));

    }

}

#else

static UHD_INLINE void fc32_to_item32_bswap(

    const fc32_t *input, item32_t *output, size_t nsamps

){

    for (size_t i = 0; i < nsamps; i++){

        output[i] = uhd::byteswap(fc32_to_item32(input[i]));

    }

}

#endif

/***********************************************************************

 * Convert items32 buffer to complex float

 **********************************************************************/

static const float floats_per_short = float(1.0/shorts_per_float);

static UHD_INLINE fc32_t item32_to_fc32(item32_t item){

    return fc32_t(

        float(boost::int16_t(item >> 16)*floats_per_short),

        float(boost::int16_t(item >> 0)*floats_per_short)

    );

}

////////////////////////////////////

// none-swap

////////////////////////////////////

#if defined(USE_EMMINTRIN_H)

static UHD_INLINE void item32_to_fc32_nswap(

    const item32_t *input, fc32_t *output, size_t nsamps

){

    __m128 scalar = _mm_set_ps1(floats_per_short/(1 << 16));

    __m128i zeroi = _mm_setzero_si128();

    //convert blocks of samples with intrinsics

    size_t i = 0; for (; i < (nsamps & ~0x3); 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_storeu_ps(reinterpret_cast<float *>(output+i+0), tmplo);

        _mm_storeu_ps(reinterpret_cast<float *>(output+i+2), tmphi);

    }

    //convert remainder

    for (; i < nsamps; i++){

        output[i] = item32_to_fc32(input[i]);

    }

}

#else

static UHD_INLINE void item32_to_fc32_nswap(

    const item32_t *input, fc32_t *output, size_t nsamps

){

    for (size_t i = 0; i < nsamps; i++){

        output[i] = item32_to_fc32(input[i]);

    }

}

#endif

////////////////////////////////////

// byte-swap

////////////////////////////////////

#if defined(USE_EMMINTRIN_H)

static UHD_INLINE void item32_to_fc32_bswap(

    const item32_t *input, fc32_t *output, size_t nsamps

){

    __m128 scalar = _mm_set_ps1(floats_per_short/(1 << 16));

    __m128i zeroi = _mm_setzero_si128();

    //convert blocks of samples with intrinsics

    size_t i = 0; for (; i < (nsamps & ~0x3); 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_storeu_ps(reinterpret_cast<float *>(output+i+0), tmplo);

        _mm_storeu_ps(reinterpret_cast<float *>(output+i+2), tmphi);

    }

    //convert remainder

    for (; i < nsamps; i++){

        output[i] = item32_to_fc32(uhd::byteswap(input[i]));

    }

}

#else

static UHD_INLINE void item32_to_fc32_bswap(

    const item32_t *input, fc32_t *output, size_t nsamps

){

    for (size_t i = 0; i < nsamps; i++){

        output[i] = item32_to_fc32(uhd::byteswap(input[i]));

    }

}

#endif

#endif /* INCLUDED_LIBUHD_TRANSPORT_CONVERT_TYPES_IMPL_HPP */