//
// Copyright 2012-2013 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;

UHD_INLINE __m128i pack_sc8_item32_4x(
    const __m128i &in0, const __m128i &in1,
    const __m128i &in2, const __m128i &in3
){
    const __m128i lo = _mm_packs_epi32(in0, in1);
    const __m128i hi = _mm_packs_epi32(in2, in3);
    return _mm_packs_epi16(lo, hi);
}

UHD_INLINE __m128i pack_sc32_4x(
    const __m128d &lo, const __m128d &hi,
    const __m128d &scalar
){
    const __m128i tmpi_lo = _mm_cvttpd_epi32(_mm_mul_pd(hi, scalar));
    const __m128i tmpi_hi = _mm_cvttpd_epi32(_mm_mul_pd(lo, scalar));
    return _mm_unpacklo_epi64(tmpi_lo, tmpi_hi);
}

DECLARE_CONVERTER(fc64, 1, sc8_item32_be, 1, PRIORITY_SIMD){
    const fc64_t *input = reinterpret_cast<const fc64_t *>(inputs[0]);
    item32_t *output = reinterpret_cast<item32_t *>(outputs[0]);

    const __m128d scalar = _mm_set1_pd(scale_factor);

    #define convert_fc64_1_to_sc8_item32_1_bswap_guts(_al_)             \
    for (size_t j = 0; i+7 < nsamps; i+=8, j+=4){                       \
        /* load from input */                                           \
        __m128d tmp0 = _mm_load ## _al_ ## pd(reinterpret_cast<const double *>(input+i+0)); \
        __m128d tmp1 = _mm_load ## _al_ ## pd(reinterpret_cast<const double *>(input+i+1)); \
        __m128d tmp2 = _mm_load ## _al_ ## pd(reinterpret_cast<const double *>(input+i+2)); \
        __m128d tmp3 = _mm_load ## _al_ ## pd(reinterpret_cast<const double *>(input+i+3)); \
        __m128d tmp4 = _mm_load ## _al_ ## pd(reinterpret_cast<const double *>(input+i+4)); \
        __m128d tmp5 = _mm_load ## _al_ ## pd(reinterpret_cast<const double *>(input+i+5)); \
        __m128d tmp6 = _mm_load ## _al_ ## pd(reinterpret_cast<const double *>(input+i+6)); \
        __m128d tmp7 = _mm_load ## _al_ ## pd(reinterpret_cast<const double *>(input+i+7)); \
                                                                        \
        /* interleave */                                                \
        const __m128i tmpi = pack_sc8_item32_4x(                        \
            pack_sc32_4x(tmp1, tmp0, scalar),                           \
            pack_sc32_4x(tmp3, tmp2, scalar),                           \
            pack_sc32_4x(tmp5, tmp4, scalar),                           \
            pack_sc32_4x(tmp7, tmp6, scalar)                            \
        );                                                              \
                                                                        \
        /* store to output */                                           \
        _mm_storeu_si128(reinterpret_cast<__m128i *>(output+j), tmpi);  \
    }                                                                   \

    size_t i = 0;

    //dispatch according to alignment
    if ((size_t(input) & 0xf) == 0){
        convert_fc64_1_to_sc8_item32_1_bswap_guts(_)
    }
    else{
        convert_fc64_1_to_sc8_item32_1_bswap_guts(u_)
    }

    //convert remainder
    xx_to_item32_sc8<uhd::htonx>(input+i, output+(i/2), nsamps-i, scale_factor);
}

DECLARE_CONVERTER(fc64, 1, sc8_item32_le, 1, PRIORITY_SIMD){
    const fc64_t *input = reinterpret_cast<const fc64_t *>(inputs[0]);
    item32_t *output = reinterpret_cast<item32_t *>(outputs[0]);

    const __m128d scalar = _mm_set1_pd(scale_factor);

    #define convert_fc64_1_to_sc8_item32_1_nswap_guts(_al_)             \
    for (size_t j = 0; i+7 < nsamps; i+=8, j+=4){                       \
        /* load from input */                                           \
        __m128d tmp0 = _mm_load ## _al_ ## pd(reinterpret_cast<const double *>(input+i+0)); \
        __m128d tmp1 = _mm_load ## _al_ ## pd(reinterpret_cast<const double *>(input+i+1)); \
        __m128d tmp2 = _mm_load ## _al_ ## pd(reinterpret_cast<const double *>(input+i+2)); \
        __m128d tmp3 = _mm_load ## _al_ ## pd(reinterpret_cast<const double *>(input+i+3)); \
        __m128d tmp4 = _mm_load ## _al_ ## pd(reinterpret_cast<const double *>(input+i+4)); \
        __m128d tmp5 = _mm_load ## _al_ ## pd(reinterpret_cast<const double *>(input+i+5)); \
        __m128d tmp6 = _mm_load ## _al_ ## pd(reinterpret_cast<const double *>(input+i+6)); \
        __m128d tmp7 = _mm_load ## _al_ ## pd(reinterpret_cast<const double *>(input+i+7)); \
                                                                        \
        /* interleave */                                                \
        __m128i tmpi = pack_sc8_item32_4x(                              \
            pack_sc32_4x(tmp0, tmp1, scalar),                           \
            pack_sc32_4x(tmp2, tmp3, scalar),                           \
            pack_sc32_4x(tmp4, tmp5, scalar),                           \
            pack_sc32_4x(tmp6, tmp7, scalar)                            \
        );                                                              \
        tmpi = _mm_or_si128(_mm_srli_epi16(tmpi, 8), _mm_slli_epi16(tmpi, 8)); /*byteswap*/\
                                                                        \
        /* store to output */                                           \
        _mm_storeu_si128(reinterpret_cast<__m128i *>(output+j), tmpi);  \
    }                                                                   \

    size_t i = 0;

    //dispatch according to alignment
    if ((size_t(input) & 0xf) == 0){
        convert_fc64_1_to_sc8_item32_1_nswap_guts(_)
    }
    else{
        convert_fc64_1_to_sc8_item32_1_nswap_guts(u_)
    }

    //convert remainder
    xx_to_item32_sc8<uhd::htowx>(input+i, output+(i/2), nsamps-i, scale_factor);
}