volk_32f_s32f_convert_8i_a.h

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#ifndef INCLUDED_volk_32f_s32f_convert_8i_a_H
#define INCLUDED_volk_32f_s32f_convert_8i_a_H

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

#ifdef LV_HAVE_SSE2
#include <emmintrin.h>
  /*!
    \brief Multiplies each point in the input buffer by the scalar value, then converts the result into a 8 bit integer value
    \param inputVector The floating point input data buffer
    \param outputVector The 8 bit output data buffer
    \param scalar The value multiplied against each point in the input buffer
    \param num_points The number of data values to be converted
  */
static inline void volk_32f_s32f_convert_8i_a_sse2(int8_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;
  int8_t* outputVectorPtr = outputVector;

  float min_val = -128;
  float max_val = 127;
  float r;

  __m128 vScalar = _mm_set_ps1(scalar);
  __m128 inputVal1, inputVal2, inputVal3, inputVal4;
  __m128i intInputVal1, intInputVal2, intInputVal3, intInputVal4;
  __m128 vmin_val = _mm_set_ps1(min_val);
  __m128 vmax_val = _mm_set_ps1(max_val);

  for(;number < sixteenthPoints; number++){
    inputVal1 = _mm_load_ps(inputVectorPtr); inputVectorPtr += 4;
    inputVal2 = _mm_load_ps(inputVectorPtr); inputVectorPtr += 4;
    inputVal3 = _mm_load_ps(inputVectorPtr); inputVectorPtr += 4;
    inputVal4 = _mm_load_ps(inputVectorPtr); inputVectorPtr += 4;

    inputVal1 = _mm_max_ps(_mm_min_ps(_mm_mul_ps(inputVal1, vScalar), vmax_val), vmin_val);
    inputVal2 = _mm_max_ps(_mm_min_ps(_mm_mul_ps(inputVal2, vScalar), vmax_val), vmin_val);
    inputVal3 = _mm_max_ps(_mm_min_ps(_mm_mul_ps(inputVal3, vScalar), vmax_val), vmin_val);
    inputVal4 = _mm_max_ps(_mm_min_ps(_mm_mul_ps(inputVal4, vScalar), vmax_val), vmin_val);

    intInputVal1 = _mm_cvtps_epi32(inputVal1);
    intInputVal2 = _mm_cvtps_epi32(inputVal2);
    intInputVal3 = _mm_cvtps_epi32(inputVal3);
    intInputVal4 = _mm_cvtps_epi32(inputVal4);

    intInputVal1 = _mm_packs_epi32(intInputVal1, intInputVal2);
    intInputVal3 = _mm_packs_epi32(intInputVal3, intInputVal4);

    intInputVal1 = _mm_packs_epi16(intInputVal1, intInputVal3);

    _mm_store_si128((__m128i*)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] = (int8_t)(r);
  }
}
#endif /* LV_HAVE_SSE2 */

#ifdef LV_HAVE_SSE
#include <xmmintrin.h>
  /*!
    \brief Multiplies each point in the input buffer by the scalar value, then converts the result into a 8 bit integer value
    \param inputVector The floating point input data buffer
    \param outputVector The 8 bit output data buffer
    \param scalar The value multiplied against each point in the input buffer
    \param num_points The number of data values to be converted
  */
static inline void volk_32f_s32f_convert_8i_a_sse(int8_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;

  float min_val = -128;
  float max_val = 127;
  float r;

  int8_t* outputVectorPtr = outputVector;
  __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;

    ret = _mm_max_ps(_mm_min_ps(_mm_mul_ps(ret, vScalar), vmax_val), vmin_val);

    _mm_store_ps(outputFloatBuffer, ret);
    *outputVectorPtr++ = (int8_t)(outputFloatBuffer[0]);
    *outputVectorPtr++ = (int8_t)(outputFloatBuffer[1]);
    *outputVectorPtr++ = (int8_t)(outputFloatBuffer[2]);
    *outputVectorPtr++ = (int8_t)(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] = (int8_t)(r);
  }
}
#endif /* LV_HAVE_SSE */

#ifdef LV_HAVE_GENERIC
  /*!
    \brief Multiplies each point in the input buffer by the scalar value, then converts the result into a 8 bit integer value
    \param inputVector The floating point input data buffer
    \param outputVector The 8 bit output data buffer
    \param scalar The value multiplied against each point in the input buffer
    \param num_points The number of data values to be converted
  */
static inline void volk_32f_s32f_convert_8i_a_generic(int8_t* outputVector, const float* inputVector, const float scalar, unsigned int num_points){
  int8_t* outputVectorPtr = outputVector;
  const float* inputVectorPtr = inputVector;
  unsigned int number = 0;
  float min_val = -128;
  float max_val = 127;
  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++ = (int8_t)(r);
  }
}
#endif /* LV_HAVE_GENERIC */




#endif /* INCLUDED_volk_32f_s32f_convert_8i_a_H */