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

    const __m128d scalar = _mm_set1_pd(scale_factor / (1 << 16));
    const __m128i zeroi  = _mm_setzero_si128();

#define convert_item32_1_to_fc64_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 */                                                        \
        __m128d tmp0 = _mm_mul_pd(_mm_cvtepi32_pd(tmpilo), scalar);                    \
        tmpilo       = _mm_unpackhi_epi64(tmpilo, zeroi);                              \
        __m128d tmp1 = _mm_mul_pd(_mm_cvtepi32_pd(tmpilo), scalar);                    \
        __m128d tmp2 = _mm_mul_pd(_mm_cvtepi32_pd(tmpihi), scalar);                    \
        tmpihi       = _mm_unpackhi_epi64(tmpihi, zeroi);                              \
        __m128d tmp3 = _mm_mul_pd(_mm_cvtepi32_pd(tmpihi), scalar);                    \
                                                                                       \
        /* store to output */                                                          \
        _mm_store##_al_##pd(reinterpret_cast<double*>(output + i + 0), tmp0);          \
        _mm_store##_al_##pd(reinterpret_cast<double*>(output + i + 1), tmp1);          \
        _mm_store##_al_##pd(reinterpret_cast<double*>(output + i + 2), tmp2);          \
        _mm_store##_al_##pd(reinterpret_cast<double*>(output + i + 3), tmp3);          \
    }

    size_t i = 0;

    // dispatch according to alignment
    if ((size_t(output) & 0xf) == 0) {
        convert_item32_1_to_fc64_1_nswap_guts(_)
    } else {
        convert_item32_1_to_fc64_1_nswap_guts(u_)
    }

    // convert remainder
    item32_sc16_to_xx<uhd::htowx>(input + i, output + i, nsamps - i, scale_factor);
}

DECLARE_CONVERTER(sc16_item32_be, 1, fc64, 1, PRIORITY_SIMD)
{
    const item32_t* input = reinterpret_cast<const item32_t*>(inputs[0]);
    fc64_t* output        = reinterpret_cast<fc64_t*>(outputs[0]);

    const __m128d scalar = _mm_set1_pd(scale_factor / (1 << 16));
    const __m128i zeroi  = _mm_setzero_si128();

#define convert_item32_1_to_fc64_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 */                                                          \
        __m128d tmp0 = _mm_mul_pd(_mm_cvtepi32_pd(tmpilo), scalar);                      \
        tmpilo       = _mm_unpackhi_epi64(tmpilo, zeroi);                                \
        __m128d tmp1 = _mm_mul_pd(_mm_cvtepi32_pd(tmpilo), scalar);                      \
        __m128d tmp2 = _mm_mul_pd(_mm_cvtepi32_pd(tmpihi), scalar);                      \
        tmpihi       = _mm_unpackhi_epi64(tmpihi, zeroi);                                \
        __m128d tmp3 = _mm_mul_pd(_mm_cvtepi32_pd(tmpihi), scalar);                      \
                                                                                         \
        /* store to output */                                                            \
        _mm_store##_al_##pd(reinterpret_cast<double*>(output + i + 0), tmp0);            \
        _mm_store##_al_##pd(reinterpret_cast<double*>(output + i + 1), tmp1);            \
        _mm_store##_al_##pd(reinterpret_cast<double*>(output + i + 2), tmp2);            \
        _mm_store##_al_##pd(reinterpret_cast<double*>(output + i + 3), tmp3);            \
    }

    size_t i = 0;

    // dispatch according to alignment
    if ((size_t(output) & 0xf) == 0) {
        convert_item32_1_to_fc64_1_bswap_guts(_)
    } else {
        convert_item32_1_to_fc64_1_bswap_guts(u_)
    }

    // convert remainder
    item32_sc16_to_xx<uhd::htonx>(input + i, output + i, nsamps - i, scale_factor);
}

DECLARE_CONVERTER(sc16_chdr, 1, fc64, 1, PRIORITY_SIMD)
{
    const sc16_t* input = reinterpret_cast<const sc16_t*>(inputs[0]);
    fc64_t* output      = reinterpret_cast<fc64_t*>(outputs[0]);

    const __m128d scalar = _mm_set1_pd(scale_factor / (1 << 16));
    const __m128i zeroi  = _mm_setzero_si128();

#define convert_chdr_1_to_fc64_1_guts(_al_)                                            \
    for (; i + 3 < nsamps; i += 4) {                                                   \
        /* load from input */                                                          \
        __m128i tmpi = _mm_loadu_si128(reinterpret_cast<const __m128i*>(input + i));   \
                                                                                       \
        /* unpack 16-bit pairs */                                                      \
        __m128i tmpilo = _mm_unpacklo_epi16(zeroi, tmpi); /* value in upper 16 bits */ \
        __m128i tmpihi = _mm_unpackhi_epi16(zeroi, tmpi);                              \
                                                                                       \
        /* convert and scale */                                                        \
        __m128d tmp0 = _mm_mul_pd(_mm_cvtepi32_pd(tmpilo), scalar);                    \
        tmpilo       = _mm_unpackhi_epi64(tmpilo, zeroi);                              \
        __m128d tmp1 = _mm_mul_pd(_mm_cvtepi32_pd(tmpilo), scalar);                    \
        __m128d tmp2 = _mm_mul_pd(_mm_cvtepi32_pd(tmpihi), scalar);                    \
        tmpihi       = _mm_unpackhi_epi64(tmpihi, zeroi);                              \
        __m128d tmp3 = _mm_mul_pd(_mm_cvtepi32_pd(tmpihi), scalar);                    \
                                                                                       \
        /* store to output */                                                          \
        _mm_store##_al_##pd(reinterpret_cast<double*>(output + i + 0), tmp0);          \
        _mm_store##_al_##pd(reinterpret_cast<double*>(output + i + 1), tmp1);          \
        _mm_store##_al_##pd(reinterpret_cast<double*>(output + i + 2), tmp2);          \
        _mm_store##_al_##pd(reinterpret_cast<double*>(output + i + 3), tmp3);          \
    }

    size_t i = 0;

    // dispatch according to alignment
    if ((size_t(output) & 0xf) == 0) {
        convert_chdr_1_to_fc64_1_guts(_)
    } else {
        convert_chdr_1_to_fc64_1_guts(u_)
    }

    // convert remainder
    chdr_sc16_to_xx(input + i, output + i, nsamps - i, scale_factor);
}