/* -*- c++ -*- */
/*
 * Copyright 2012, 2014 Free Software Foundation, Inc.
 *
 * This file is part of VOLK
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 */

/*!
 * \page volk_32f_s32f_convert_16i
 *
 * \b Overview
 *
 * Converts a floating point number to a 16-bit short after applying a
 * scaling factor.
 *
 * <b>Dispatcher Prototype</b>
 * \code
 * void volk_32f_s32f_convert_16i(int16_t* outputVector, const float* inputVector, const
 * float scalar, unsigned int num_points) \endcode
 *
 * \b Inputs
 * \li inputVector: the input vector of floats.
 * \li scalar: The value multiplied against each point in the input buffer.
 * \li num_points: The number of data points.
 *
 * \b Outputs
 * \li outputVector: The output vector.
 *
 * \b Example
 * Convert floats from [-1,1] to 16-bit integers with a scale of 5 to maintain smallest
 * delta int N = 10; unsigned int alignment = volk_get_alignment(); float* increasing =
 * (float*)volk_malloc(sizeof(float)*N, alignment); int16_t* out =
 * (int16_t*)volk_malloc(sizeof(int16_t)*N, alignment);
 *
 *   for(unsigned int ii = 0; ii < N; ++ii){
 *       increasing[ii] = 2.f * ((float)ii / (float)N) - 1.f;
 *   }
 *
 *   // Normalize by the smallest delta (0.2 in this example)
 *   float scale = 5.f;
 *
 *   volk_32f_s32f_convert_32i(out, increasing, scale, N);
 *
 *   for(unsigned int ii = 0; ii < N; ++ii){
 *       printf("out[%u] = %i\n", ii, out[ii]);
 *   }
 *
 *   volk_free(increasing);
 *   volk_free(out);
 * \endcode
 */

#ifndef INCLUDED_volk_32f_s32f_convert_16i_u_H
#define INCLUDED_volk_32f_s32f_convert_16i_u_H

#include <inttypes.h>
#include <limits.h>
#include <stdio.h>

#ifdef LV_HAVE_AVX2
#include <immintrin.h>

static inline void volk_32f_s32f_convert_16i_u_avx2(int16_t* outputVector,
                                                    const float* inputVector,
                                                    const float scalar,
                                                    unsigned int num_points)
{
    unsigned int number = 0;

    const unsigned int sixteenthPoints = num_points / 16;

    const float* inputVectorPtr = (const float*)inputVector;
    int16_t* outputVectorPtr = outputVector;

    float min_val = SHRT_MIN;
    float max_val = SHRT_MAX;
    float r;

    __m256 vScalar = _mm256_set1_ps(scalar);
    __m256 inputVal1, inputVal2;
    __m256i intInputVal1, intInputVal2;
    __m256 ret1, ret2;
    __m256 vmin_val = _mm256_set1_ps(min_val);
    __m256 vmax_val = _mm256_set1_ps(max_val);

    for (; number < sixteenthPoints; number++) {
        inputVal1 = _mm256_loadu_ps(inputVectorPtr);
        inputVectorPtr += 8;
        inputVal2 = _mm256_loadu_ps(inputVectorPtr);
        inputVectorPtr += 8;

        // Scale and clip
        ret1 = _mm256_max_ps(_mm256_min_ps(_mm256_mul_ps(inputVal1, vScalar), vmax_val),
                             vmin_val);
        ret2 = _mm256_max_ps(_mm256_min_ps(_mm256_mul_ps(inputVal2, vScalar), vmax_val),
                             vmin_val);

        intInputVal1 = _mm256_cvtps_epi32(ret1);
        intInputVal2 = _mm256_cvtps_epi32(ret2);

        intInputVal1 = _mm256_packs_epi32(intInputVal1, intInputVal2);
        intInputVal1 = _mm256_permute4x64_epi64(intInputVal1, 0b11011000);

        _mm256_storeu_si256((__m256i*)outputVectorPtr, intInputVal1);
        outputVectorPtr += 16;
    }

    number = sixteenthPoints * 16;
    for (; number < num_points; number++) {
        r = inputVector[number] * scalar;
        if (r > max_val)
            r = max_val;
        else if (r < min_val)
            r = min_val;
        outputVector[number] = (int16_t)rintf(r);
    }
}
#endif /* LV_HAVE_AVX2 */


#ifdef LV_HAVE_AVX
#include <immintrin.h>

static inline void volk_32f_s32f_convert_16i_u_avx(int16_t* outputVector,
                                                   const float* inputVector,
                                                   const float scalar,
                                                   unsigned int num_points)
{
    unsigned int number = 0;

    const unsigned int eighthPoints = num_points / 8;

    const float* inputVectorPtr = (const float*)inputVector;
    int16_t* outputVectorPtr = outputVector;

    float min_val = SHRT_MIN;
    float max_val = SHRT_MAX;
    float r;

    __m256 vScalar = _mm256_set1_ps(scalar);
    __m256 inputVal, ret;
    __m256i intInputVal;
    __m128i intInputVal1, intInputVal2;
    __m256 vmin_val = _mm256_set1_ps(min_val);
    __m256 vmax_val = _mm256_set1_ps(max_val);

    for (; number < eighthPoints; number++) {
        inputVal = _mm256_loadu_ps(inputVectorPtr);
        inputVectorPtr += 8;

        // Scale and clip
        ret = _mm256_max_ps(_mm256_min_ps(_mm256_mul_ps(inputVal, vScalar), vmax_val),
                            vmin_val);

        intInputVal = _mm256_cvtps_epi32(ret);

        intInputVal1 = _mm256_extractf128_si256(intInputVal, 0);
        intInputVal2 = _mm256_extractf128_si256(intInputVal, 1);

        intInputVal1 = _mm_packs_epi32(intInputVal1, intInputVal2);

        _mm_storeu_si128((__m128i*)outputVectorPtr, intInputVal1);
        outputVectorPtr += 8;
    }

    number = eighthPoints * 8;
    for (; number < num_points; number++) {
        r = inputVector[number] * scalar;
        if (r > max_val)
            r = max_val;
        else if (r < min_val)
            r = min_val;
        outputVector[number] = (int16_t)rintf(r);
    }
}
#endif /* LV_HAVE_AVX */


#ifdef LV_HAVE_SSE2
#include <emmintrin.h>

static inline void volk_32f_s32f_convert_16i_u_sse2(int16_t* outputVector,
                                                    const float* inputVector,
                                                    const float scalar,
                                                    unsigned int num_points)
{
    unsigned int number = 0;

    const unsigned int eighthPoints = num_points / 8;

    const float* inputVectorPtr = (const float*)inputVector;
    int16_t* outputVectorPtr = outputVector;

    float min_val = SHRT_MIN;
    float max_val = SHRT_MAX;
    float r;

    __m128 vScalar = _mm_set_ps1(scalar);
    __m128 inputVal1, inputVal2;
    __m128i intInputVal1, intInputVal2;
    __m128 ret1, ret2;
    __m128 vmin_val = _mm_set_ps1(min_val);
    __m128 vmax_val = _mm_set_ps1(max_val);

    for (; number < eighthPoints; number++) {
        inputVal1 = _mm_loadu_ps(inputVectorPtr);
        inputVectorPtr += 4;
        inputVal2 = _mm_loadu_ps(inputVectorPtr);
        inputVectorPtr += 4;

        // Scale and clip
        ret1 = _mm_max_ps(_mm_min_ps(_mm_mul_ps(inputVal1, vScalar), vmax_val), vmin_val);
        ret2 = _mm_max_ps(_mm_min_ps(_mm_mul_ps(inputVal2, vScalar), vmax_val), vmin_val);

        intInputVal1 = _mm_cvtps_epi32(ret1);
        intInputVal2 = _mm_cvtps_epi32(ret2);

        intInputVal1 = _mm_packs_epi32(intInputVal1, intInputVal2);

        _mm_storeu_si128((__m128i*)outputVectorPtr, intInputVal1);
        outputVectorPtr += 8;
    }

    number = eighthPoints * 8;
    for (; number < num_points; number++) {
        r = inputVector[number] * scalar;
        if (r > max_val)
            r = max_val;
        else if (r < min_val)
            r = min_val;
        outputVector[number] = (int16_t)rintf(r);
    }
}
#endif /* LV_HAVE_SSE2 */


#ifdef LV_HAVE_SSE
#include <xmmintrin.h>

static inline void volk_32f_s32f_convert_16i_u_sse(int16_t* outputVector,
                                                   const float* inputVector,
                                                   const float scalar,
                                                   unsigned int num_points)
{
    unsigned int number = 0;

    const unsigned int quarterPoints = num_points / 4;

    const float* inputVectorPtr = (const float*)inputVector;
    int16_t* outputVectorPtr = outputVector;

    float min_val = SHRT_MIN;
    float max_val = SHRT_MAX;
    float r;

    __m128 vScalar = _mm_set_ps1(scalar);
    __m128 ret;
    __m128 vmin_val = _mm_set_ps1(min_val);
    __m128 vmax_val = _mm_set_ps1(max_val);

    __VOLK_ATTR_ALIGNED(16) float outputFloatBuffer[4];

    for (; number < quarterPoints; number++) {
        ret = _mm_loadu_ps(inputVectorPtr);
        inputVectorPtr += 4;

        // Scale and clip
        ret = _mm_max_ps(_mm_min_ps(_mm_mul_ps(ret, vScalar), vmax_val), vmin_val);

        _mm_store_ps(outputFloatBuffer, ret);
        *outputVectorPtr++ = (int16_t)rintf(outputFloatBuffer[0]);
        *outputVectorPtr++ = (int16_t)rintf(outputFloatBuffer[1]);
        *outputVectorPtr++ = (int16_t)rintf(outputFloatBuffer[2]);
        *outputVectorPtr++ = (int16_t)rintf(outputFloatBuffer[3]);
    }

    number = quarterPoints * 4;
    for (; number < num_points; number++) {
        r = inputVector[number] * scalar;
        if (r > max_val)
            r = max_val;
        else if (r < min_val)
            r = min_val;
        outputVector[number] = (int16_t)rintf(r);
    }
}
#endif /* LV_HAVE_SSE */


#ifdef LV_HAVE_GENERIC

static inline void volk_32f_s32f_convert_16i_generic(int16_t* outputVector,
                                                     const float* inputVector,
                                                     const float scalar,
                                                     unsigned int num_points)
{
    int16_t* outputVectorPtr = outputVector;
    const float* inputVectorPtr = inputVector;
    unsigned int number = 0;
    float min_val = SHRT_MIN;
    float max_val = SHRT_MAX;
    float r;

    for (number = 0; number < num_points; number++) {
        r = *inputVectorPtr++ * scalar;
        if (r > max_val)
            r = max_val;
        else if (r < min_val)
            r = min_val;
        *outputVectorPtr++ = (int16_t)rintf(r);
    }
}
#endif /* LV_HAVE_GENERIC */


#endif /* INCLUDED_volk_32f_s32f_convert_16i_u_H */
#ifndef INCLUDED_volk_32f_s32f_convert_16i_a_H
#define INCLUDED_volk_32f_s32f_convert_16i_a_H

#include <inttypes.h>
#include <math.h>
#include <stdio.h>
#include <volk/volk_common.h>

#ifdef LV_HAVE_AVX2
#include <immintrin.h>

static inline void volk_32f_s32f_convert_16i_a_avx2(int16_t* outputVector,
                                                    const float* inputVector,
                                                    const float scalar,
                                                    unsigned int num_points)
{
    unsigned int number = 0;

    const unsigned int sixteenthPoints = num_points / 16;

    const float* inputVectorPtr = (const float*)inputVector;
    int16_t* outputVectorPtr = outputVector;

    float min_val = SHRT_MIN;
    float max_val = SHRT_MAX;
    float r;

    __m256 vScalar = _mm256_set1_ps(scalar);
    __m256 inputVal1, inputVal2;
    __m256i intInputVal1, intInputVal2;
    __m256 ret1, ret2;
    __m256 vmin_val = _mm256_set1_ps(min_val);
    __m256 vmax_val = _mm256_set1_ps(max_val);

    for (; number < sixteenthPoints; number++) {
        inputVal1 = _mm256_load_ps(inputVectorPtr);
        inputVectorPtr += 8;
        inputVal2 = _mm256_load_ps(inputVectorPtr);
        inputVectorPtr += 8;

        // Scale and clip
        ret1 = _mm256_max_ps(_mm256_min_ps(_mm256_mul_ps(inputVal1, vScalar), vmax_val),
                             vmin_val);
        ret2 = _mm256_max_ps(_mm256_min_ps(_mm256_mul_ps(inputVal2, vScalar), vmax_val),
                             vmin_val);

        intInputVal1 = _mm256_cvtps_epi32(ret1);
        intInputVal2 = _mm256_cvtps_epi32(ret2);

        intInputVal1 = _mm256_packs_epi32(intInputVal1, intInputVal2);
        intInputVal1 = _mm256_permute4x64_epi64(intInputVal1, 0b11011000);

        _mm256_store_si256((__m256i*)outputVectorPtr, intInputVal1);
        outputVectorPtr += 16;
    }

    number = sixteenthPoints * 16;
    for (; number < num_points; number++) {
        r = inputVector[number] * scalar;
        if (r > max_val)
            r = max_val;
        else if (r < min_val)
            r = min_val;
        outputVector[number] = (int16_t)rintf(r);
    }
}
#endif /* LV_HAVE_AVX2 */


#ifdef LV_HAVE_AVX
#include <immintrin.h>

static inline void volk_32f_s32f_convert_16i_a_avx(int16_t* outputVector,
                                                   const float* inputVector,
                                                   const float scalar,
                                                   unsigned int num_points)
{
    unsigned int number = 0;

    const unsigned int eighthPoints = num_points / 8;

    const float* inputVectorPtr = (const float*)inputVector;
    int16_t* outputVectorPtr = outputVector;

    float min_val = SHRT_MIN;
    float max_val = SHRT_MAX;
    float r;

    __m256 vScalar = _mm256_set1_ps(scalar);
    __m256 inputVal, ret;
    __m256i intInputVal;
    __m128i intInputVal1, intInputVal2;
    __m256 vmin_val = _mm256_set1_ps(min_val);
    __m256 vmax_val = _mm256_set1_ps(max_val);

    for (; number < eighthPoints; number++) {
        inputVal = _mm256_load_ps(inputVectorPtr);
        inputVectorPtr += 8;

        // Scale and clip
        ret = _mm256_max_ps(_mm256_min_ps(_mm256_mul_ps(inputVal, vScalar), vmax_val),
                            vmin_val);

        intInputVal = _mm256_cvtps_epi32(ret);

        intInputVal1 = _mm256_extractf128_si256(intInputVal, 0);
        intInputVal2 = _mm256_extractf128_si256(intInputVal, 1);

        intInputVal1 = _mm_packs_epi32(intInputVal1, intInputVal2);

        _mm_store_si128((__m128i*)outputVectorPtr, intInputVal1);
        outputVectorPtr += 8;
    }

    number = eighthPoints * 8;
    for (; number < num_points; number++) {
        r = inputVector[number] * scalar;
        if (r > max_val)
            r = max_val;
        else if (r < min_val)
            r = min_val;
        outputVector[number] = (int16_t)rintf(r);
    }
}
#endif /* LV_HAVE_AVX */

#ifdef LV_HAVE_SSE2
#include <emmintrin.h>

static inline void volk_32f_s32f_convert_16i_a_sse2(int16_t* outputVector,
                                                    const float* inputVector,
                                                    const float scalar,
                                                    unsigned int num_points)
{
    unsigned int number = 0;

    const unsigned int eighthPoints = num_points / 8;

    const float* inputVectorPtr = (const float*)inputVector;
    int16_t* outputVectorPtr = outputVector;

    float min_val = SHRT_MIN;
    float max_val = SHRT_MAX;
    float r;

    __m128 vScalar = _mm_set_ps1(scalar);
    __m128 inputVal1, inputVal2;
    __m128i intInputVal1, intInputVal2;
    __m128 ret1, ret2;
    __m128 vmin_val = _mm_set_ps1(min_val);
    __m128 vmax_val = _mm_set_ps1(max_val);

    for (; number < eighthPoints; number++) {
        inputVal1 = _mm_load_ps(inputVectorPtr);
        inputVectorPtr += 4;
        inputVal2 = _mm_load_ps(inputVectorPtr);
        inputVectorPtr += 4;

        // Scale and clip
        ret1 = _mm_max_ps(_mm_min_ps(_mm_mul_ps(inputVal1, vScalar), vmax_val), vmin_val);
        ret2 = _mm_max_ps(_mm_min_ps(_mm_mul_ps(inputVal2, vScalar), vmax_val), vmin_val);

        intInputVal1 = _mm_cvtps_epi32(ret1);
        intInputVal2 = _mm_cvtps_epi32(ret2);

        intInputVal1 = _mm_packs_epi32(intInputVal1, intInputVal2);

        _mm_store_si128((__m128i*)outputVectorPtr, intInputVal1);
        outputVectorPtr += 8;
    }

    number = eighthPoints * 8;
    for (; number < num_points; number++) {
        r = inputVector[number] * scalar;
        if (r > max_val)
            r = max_val;
        else if (r < min_val)
            r = min_val;
        outputVector[number] = (int16_t)rintf(r);
    }
}
#endif /* LV_HAVE_SSE2 */


#ifdef LV_HAVE_SSE
#include <xmmintrin.h>

static inline void volk_32f_s32f_convert_16i_a_sse(int16_t* outputVector,
                                                   const float* inputVector,
                                                   const float scalar,
                                                   unsigned int num_points)
{
    unsigned int number = 0;

    const unsigned int quarterPoints = num_points / 4;

    const float* inputVectorPtr = (const float*)inputVector;
    int16_t* outputVectorPtr = outputVector;

    float min_val = SHRT_MIN;
    float max_val = SHRT_MAX;
    float r;

    __m128 vScalar = _mm_set_ps1(scalar);
    __m128 ret;
    __m128 vmin_val = _mm_set_ps1(min_val);
    __m128 vmax_val = _mm_set_ps1(max_val);

    __VOLK_ATTR_ALIGNED(16) float outputFloatBuffer[4];

    for (; number < quarterPoints; number++) {
        ret = _mm_load_ps(inputVectorPtr);
        inputVectorPtr += 4;

        // Scale and clip
        ret = _mm_max_ps(_mm_min_ps(_mm_mul_ps(ret, vScalar), vmax_val), vmin_val);

        _mm_store_ps(outputFloatBuffer, ret);
        *outputVectorPtr++ = (int16_t)rintf(outputFloatBuffer[0]);
        *outputVectorPtr++ = (int16_t)rintf(outputFloatBuffer[1]);
        *outputVectorPtr++ = (int16_t)rintf(outputFloatBuffer[2]);
        *outputVectorPtr++ = (int16_t)rintf(outputFloatBuffer[3]);
    }

    number = quarterPoints * 4;
    for (; number < num_points; number++) {
        r = inputVector[number] * scalar;
        if (r > max_val)
            r = max_val;
        else if (r < min_val)
            r = min_val;
        outputVector[number] = (int16_t)rintf(r);
    }
}
#endif /* LV_HAVE_SSE */


#ifdef LV_HAVE_GENERIC

static inline void volk_32f_s32f_convert_16i_a_generic(int16_t* outputVector,
                                                       const float* inputVector,
                                                       const float scalar,
                                                       unsigned int num_points)
{
    int16_t* outputVectorPtr = outputVector;
    const float* inputVectorPtr = inputVector;
    unsigned int number = 0;
    float min_val = SHRT_MIN;
    float max_val = SHRT_MAX;
    float r;

    for (number = 0; number < num_points; number++) {
        r = *inputVectorPtr++ * scalar;
        if (r < min_val)
            r = min_val;
        else if (r > max_val)
            r = max_val;
        *outputVectorPtr++ = (int16_t)rintf(r);
    }
}
#endif /* LV_HAVE_GENERIC */

#endif /* INCLUDED_volk_32f_s32f_convert_16i_a_H */
