/* -*- c++ -*- */
/*
 * Copyright 2012, 2014 Free Software Foundation, Inc.
 *
 * This file is part of GNU Radio
 *
 * GNU Radio 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, or (at your option)
 * any later version.
 *
 * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

/*!
 * \page volk_16i_s32f_convert_32f
 *
 * \b Overview
 *
 * Converts 16-bit shorts to scaled 32-bit floating point values.
 *
 * <b>Dispatcher Prototype</b>
 * \code
 * void volk_16i_s32f_convert_32f(float* outputVector, const int16_t* inputVector, const float scalar, unsigned int num_points);
 * \endcode
 *
 * \b Inputs
 * \li inputVector: The input vector of 16-bit shorts.
 * \li scalar: The value divided against each point in the output buffer.
 * \li num_points: The number of complex data points.
 *
 * \b Outputs
 * \li outputVector: The output vector of 8-bit chars.
 *
 * \b Example
 * \code
 * int N = 10000;
 *
 * volk_16i_s32f_convert_32f();
 *
 * volk_free(x);
 * volk_free(t);
 * \endcode
 */

#ifndef INCLUDED_volk_16i_s32f_convert_32f_u_H
#define INCLUDED_volk_16i_s32f_convert_32f_u_H

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

#ifdef LV_HAVE_AVX
#include <immintrin.h>

static inline void
volk_16i_s32f_convert_32f_u_avx(float* outputVector, const int16_t* inputVector,
                                const float scalar, unsigned int num_points)
{
  unsigned int number = 0;
  const unsigned int eighthPoints = num_points / 8;

  float* outputVectorPtr = outputVector;
  __m128 invScalar = _mm_set_ps1(1.0/scalar);
  int16_t* inputPtr = (int16_t*)inputVector;
  __m128i inputVal, inputVal2;
  __m128 ret;
  __m256 output;
  __m256 dummy = _mm256_setzero_ps();

  for(;number < eighthPoints; number++){

    // Load the 8 values
    //inputVal = _mm_loadu_si128((__m128i*)inputPtr);
    inputVal = _mm_loadu_si128((__m128i*)inputPtr);

    // Shift the input data to the right by 64 bits ( 8 bytes )
    inputVal2 = _mm_srli_si128(inputVal, 8);

    // Convert the lower 4 values into 32 bit words
    inputVal = _mm_cvtepi16_epi32(inputVal);
    inputVal2 = _mm_cvtepi16_epi32(inputVal2);

    ret = _mm_cvtepi32_ps(inputVal);
    ret = _mm_mul_ps(ret, invScalar);
    output = _mm256_insertf128_ps(dummy, ret, 0);

    ret = _mm_cvtepi32_ps(inputVal2);
    ret = _mm_mul_ps(ret, invScalar);
    output = _mm256_insertf128_ps(output, ret, 1);

    _mm256_storeu_ps(outputVectorPtr, output);

    outputVectorPtr += 8;

    inputPtr += 8;
  }

  number = eighthPoints * 8;
  for(; number < num_points; number++){
    outputVector[number] =((float)(inputVector[number])) / scalar;
  }
}
#endif /* LV_HAVE_AVX */

#ifdef LV_HAVE_SSE4_1
#include <smmintrin.h>

static inline void
volk_16i_s32f_convert_32f_u_sse4_1(float* outputVector, const int16_t* inputVector,
                                   const float scalar, unsigned int num_points)
{
  unsigned int number = 0;
  const unsigned int eighthPoints = num_points / 8;

  float* outputVectorPtr = outputVector;
  __m128 invScalar = _mm_set_ps1(1.0/scalar);
  int16_t* inputPtr = (int16_t*)inputVector;
  __m128i inputVal;
  __m128i inputVal2;
  __m128 ret;

  for(;number < eighthPoints; number++){

    // Load the 8 values
    inputVal = _mm_loadu_si128((__m128i*)inputPtr);

    // Shift the input data to the right by 64 bits ( 8 bytes )
    inputVal2 = _mm_srli_si128(inputVal, 8);

    // Convert the lower 4 values into 32 bit words
    inputVal = _mm_cvtepi16_epi32(inputVal);
    inputVal2 = _mm_cvtepi16_epi32(inputVal2);

    ret = _mm_cvtepi32_ps(inputVal);
    ret = _mm_mul_ps(ret, invScalar);
    _mm_storeu_ps(outputVectorPtr, ret);
    outputVectorPtr += 4;

    ret = _mm_cvtepi32_ps(inputVal2);
    ret = _mm_mul_ps(ret, invScalar);
    _mm_storeu_ps(outputVectorPtr, ret);

    outputVectorPtr += 4;

    inputPtr += 8;
  }

  number = eighthPoints * 8;
  for(; number < num_points; number++){
    outputVector[number] =((float)(inputVector[number])) / scalar;
  }
}
#endif /* LV_HAVE_SSE4_1 */

#ifdef LV_HAVE_SSE
#include <xmmintrin.h>

static inline void
volk_16i_s32f_convert_32f_u_sse(float* outputVector, const int16_t* inputVector,
                                const float scalar, unsigned int num_points)
{
  unsigned int number = 0;
  const unsigned int quarterPoints = num_points / 4;

  float* outputVectorPtr = outputVector;
  __m128 invScalar = _mm_set_ps1(1.0/scalar);
  int16_t* inputPtr = (int16_t*)inputVector;
  __m128 ret;

  for(;number < quarterPoints; number++){
    ret = _mm_set_ps((float)(inputPtr[3]), (float)(inputPtr[2]), (float)(inputPtr[1]), (float)(inputPtr[0]));

    ret = _mm_mul_ps(ret, invScalar);
    _mm_storeu_ps(outputVectorPtr, ret);

    inputPtr += 4;
    outputVectorPtr += 4;
  }

  number = quarterPoints * 4;
  for(; number < num_points; number++){
    outputVector[number] = (float)(inputVector[number]) / scalar;
  }
}
#endif /* LV_HAVE_SSE */

#ifdef LV_HAVE_GENERIC

static inline void
volk_16i_s32f_convert_32f_generic(float* outputVector, const int16_t* inputVector,
                                  const float scalar, unsigned int num_points)
{
  float* outputVectorPtr = outputVector;
  const int16_t* inputVectorPtr = inputVector;
  unsigned int number = 0;

  for(number = 0; number < num_points; number++){
    *outputVectorPtr++ = ((float)(*inputVectorPtr++)) / scalar;
  }
}
#endif /* LV_HAVE_GENERIC */

#ifdef LV_HAVE_NEON
#include <arm_neon.h>

static inline void
volk_16i_s32f_convert_32f_neon(float* outputVector, const int16_t* inputVector,
                               const float scalar, unsigned int num_points)
{
  float* outputPtr = outputVector;
  const int16_t* inputPtr = inputVector;
  unsigned int number = 0;
  unsigned int eighth_points = num_points / 8;

  int16x4x2_t input16;
  int32x4_t input32_0, input32_1;
  float32x4_t input_float_0, input_float_1;
  float32x4x2_t output_float;
  float32x4_t inv_scale;

  inv_scale = vdupq_n_f32(1.0/scalar);

  // the generic disassembles to a 128-bit load
  // and duplicates every instruction to operate on 64-bits
  // at a time. This is only possible with lanes, which is faster
  // than just doing a vld1_s16, but still slower.
  for(number = 0; number < eighth_points; number++){
    input16 = vld2_s16(inputPtr);
    // widen 16-bit int to 32-bit int
    input32_0 = vmovl_s16(input16.val[0]);
    input32_1 = vmovl_s16(input16.val[1]);
    // convert 32-bit int to float with scale
    input_float_0 = vcvtq_f32_s32(input32_0);
    input_float_1 = vcvtq_f32_s32(input32_1);
    output_float.val[0] = vmulq_f32(input_float_0, inv_scale);
    output_float.val[1] = vmulq_f32(input_float_1, inv_scale);
    vst2q_f32(outputPtr, output_float);
    inputPtr += 8;
    outputPtr += 8;
  }

  for(number = eighth_points*8; number < num_points; number++){
    *outputPtr++ = ((float)(*inputPtr++)) / scalar;
  }
}
#endif /* LV_HAVE_NEON */


#endif /* INCLUDED_volk_16i_s32f_convert_32f_u_H */
#ifndef INCLUDED_volk_16i_s32f_convert_32f_a_H
#define INCLUDED_volk_16i_s32f_convert_32f_a_H

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

#ifdef LV_HAVE_AVX
#include <immintrin.h>

static inline void
volk_16i_s32f_convert_32f_a_avx(float* outputVector, const int16_t* inputVector,
                                const float scalar, unsigned int num_points)
{
  unsigned int number = 0;
  const unsigned int eighthPoints = num_points / 8;

  float* outputVectorPtr = outputVector;
  __m128 invScalar = _mm_set_ps1(1.0/scalar);
  int16_t* inputPtr = (int16_t*)inputVector;
  __m128i inputVal, inputVal2;
  __m128 ret;
  __m256 output;
  __m256 dummy = _mm256_setzero_ps();

  for(;number < eighthPoints; number++){

    // Load the 8 values
    //inputVal = _mm_loadu_si128((__m128i*)inputPtr);
    inputVal = _mm_load_si128((__m128i*)inputPtr);

    // Shift the input data to the right by 64 bits ( 8 bytes )
    inputVal2 = _mm_srli_si128(inputVal, 8);

    // Convert the lower 4 values into 32 bit words
    inputVal = _mm_cvtepi16_epi32(inputVal);
    inputVal2 = _mm_cvtepi16_epi32(inputVal2);

    ret = _mm_cvtepi32_ps(inputVal);
    ret = _mm_mul_ps(ret, invScalar);
    output = _mm256_insertf128_ps(dummy, ret, 0);

    ret = _mm_cvtepi32_ps(inputVal2);
    ret = _mm_mul_ps(ret, invScalar);
    output = _mm256_insertf128_ps(output, ret, 1);

    _mm256_store_ps(outputVectorPtr, output);

    outputVectorPtr += 8;

    inputPtr += 8;
  }

  number = eighthPoints * 8;
  for(; number < num_points; number++){
    outputVector[number] =((float)(inputVector[number])) / scalar;
  }
}
#endif /* LV_HAVE_AVX */

#ifdef LV_HAVE_SSE4_1
#include <smmintrin.h>

static inline void
volk_16i_s32f_convert_32f_a_sse4_1(float* outputVector, const int16_t* inputVector,
                                   const float scalar, unsigned int num_points)
{
  unsigned int number = 0;
  const unsigned int eighthPoints = num_points / 8;

  float* outputVectorPtr = outputVector;
  __m128 invScalar = _mm_set_ps1(1.0/scalar);
  int16_t* inputPtr = (int16_t*)inputVector;
  __m128i inputVal;
  __m128i inputVal2;
  __m128 ret;

  for(;number < eighthPoints; number++){

    // Load the 8 values
    inputVal = _mm_loadu_si128((__m128i*)inputPtr);

    // Shift the input data to the right by 64 bits ( 8 bytes )
    inputVal2 = _mm_srli_si128(inputVal, 8);

    // Convert the lower 4 values into 32 bit words
    inputVal = _mm_cvtepi16_epi32(inputVal);
    inputVal2 = _mm_cvtepi16_epi32(inputVal2);

    ret = _mm_cvtepi32_ps(inputVal);
    ret = _mm_mul_ps(ret, invScalar);
    _mm_storeu_ps(outputVectorPtr, ret);
    outputVectorPtr += 4;

    ret = _mm_cvtepi32_ps(inputVal2);
    ret = _mm_mul_ps(ret, invScalar);
    _mm_storeu_ps(outputVectorPtr, ret);

    outputVectorPtr += 4;

    inputPtr += 8;
  }

  number = eighthPoints * 8;
  for(; number < num_points; number++){
    outputVector[number] =((float)(inputVector[number])) / scalar;
  }
}
#endif /* LV_HAVE_SSE4_1 */

#ifdef LV_HAVE_SSE
#include <xmmintrin.h>

static inline void
volk_16i_s32f_convert_32f_a_sse(float* outputVector, const int16_t* inputVector,
                                const float scalar, unsigned int num_points)
{
  unsigned int number = 0;
  const unsigned int quarterPoints = num_points / 4;

  float* outputVectorPtr = outputVector;
  __m128 invScalar = _mm_set_ps1(1.0/scalar);
  int16_t* inputPtr = (int16_t*)inputVector;
  __m128 ret;

  for(;number < quarterPoints; number++){
    ret = _mm_set_ps((float)(inputPtr[3]), (float)(inputPtr[2]), (float)(inputPtr[1]), (float)(inputPtr[0]));

    ret = _mm_mul_ps(ret, invScalar);
    _mm_storeu_ps(outputVectorPtr, ret);

    inputPtr += 4;
    outputVectorPtr += 4;
  }

  number = quarterPoints * 4;
  for(; number < num_points; number++){
    outputVector[number] = (float)(inputVector[number]) / scalar;
  }
}
#endif /* LV_HAVE_SSE */

#ifdef LV_HAVE_GENERIC

static inline void
volk_16i_s32f_convert_32f_a_generic(float* outputVector, const int16_t* inputVector,
                                    const float scalar, unsigned int num_points)
{
  float* outputVectorPtr = outputVector;
  const int16_t* inputVectorPtr = inputVector;
  unsigned int number = 0;

  for(number = 0; number < num_points; number++){
    *outputVectorPtr++ = ((float)(*inputVectorPtr++)) / scalar;
  }
}
#endif /* LV_HAVE_GENERIC */

#endif /* INCLUDED_volk_16i_s32f_convert_32f_a_H */
