volk_32f_sqrt_32f.h

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#ifndef INCLUDED_volk_32f_sqrt_32f_a_H
#define INCLUDED_volk_32f_sqrt_32f_a_H

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

#ifdef LV_HAVE_SSE
#include <xmmintrin.h>
/*!
  \brief Sqrts the two input vectors and store their results in the third vector
  \param cVector The vector where the results will be stored
  \param aVector One of the vectors to be sqrted
  \param num_points The number of values in aVector and bVector to be sqrted together and stored into cVector
*/
static inline void volk_32f_sqrt_32f_a_sse(float* cVector, const float* aVector, unsigned int num_points){
    unsigned int number = 0;
    const unsigned int quarterPoints = num_points / 4;

    float* cPtr = cVector;
    const float* aPtr = aVector;

    __m128 aVal, cVal;
    for(;number < quarterPoints; number++){

      aVal = _mm_load_ps(aPtr);

      cVal = _mm_sqrt_ps(aVal);

      _mm_store_ps(cPtr,cVal); // Store the results back into the C container

      aPtr += 4;
      cPtr += 4;
    }

    number = quarterPoints * 4;
    for(;number < num_points; number++){
      *cPtr++ = sqrtf(*aPtr++);
    }
}
#endif /* LV_HAVE_SSE */

#ifdef LV_HAVE_NEON
#include <arm_neon.h>

/*!
  \brief Sqrts the two input vectors and store their results in the third vector
  \param cVector The vector where the results will be stored
  \param aVector One of the vectors to be sqrted
  \param num_points The number of values in aVector and bVector to be sqrted together and stored into cVector
*/
static inline void volk_32f_sqrt_32f_neon(float* cVector, const float* aVector, unsigned int num_points){
    float* cPtr = cVector;
    const float* aPtr = aVector;
    unsigned int number = 0;
    unsigned int quarter_points = num_points / 4;
    float32x4_t in_vec, out_vec;

    for(number = 0; number < quarter_points; number++){
        in_vec = vld1q_f32(aPtr);
        // note that armv8 has vsqrt_f32 which will be much better
        out_vec = vrecpeq_f32(vrsqrteq_f32(in_vec) );
        vst1q_f32(cPtr, out_vec);
        aPtr += 4;
        cPtr += 4;
    }

    for(number = quarter_points * 4; number < num_points; number++){
      *cPtr++ = sqrtf(*aPtr++);
    }
}
#endif /* LV_HAVE_NEON */

#ifdef LV_HAVE_GENERIC
/*!
  \brief Sqrts the two input vectors and store their results in the third vector
  \param cVector The vector where the results will be stored
  \param aVector One of the vectors to be sqrted
  \param num_points The number of values in aVector and bVector to be sqrted together and stored into cVector
*/
static inline void volk_32f_sqrt_32f_generic(float* cVector, const float* aVector, unsigned int num_points){
    float* cPtr = cVector;
    const float* aPtr = aVector;
    unsigned int number = 0;

    for(number = 0; number < num_points; number++){
      *cPtr++ = sqrtf(*aPtr++);
    }
}
#endif /* LV_HAVE_GENERIC */

#ifdef LV_HAVE_ORC
extern void volk_32f_sqrt_32f_a_orc_impl(float *, const float*, unsigned int);
/*!
  \brief Sqrts the two input vectors and store their results in the third vector
  \param cVector The vector where the results will be stored
  \param aVector One of the vectors to be sqrted
  \param num_points The number of values in aVector and bVector to be sqrted together and stored into cVector
*/
static inline void volk_32f_sqrt_32f_u_orc(float* cVector, const float* aVector, unsigned int num_points){
    volk_32f_sqrt_32f_a_orc_impl(cVector, aVector, num_points);
}

#endif /* LV_HAVE_ORC */



#endif /* INCLUDED_volk_32f_sqrt_32f_a_H */