volk_32fc_s32f_power_32fc.h

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/* -*- c++ -*- */
/*
 * Copyright 2012, 2014 Free Software Foundation, Inc.
 *
 * This file is part of VOLK
 *
 * SPDX-License-Identifier: LGPL-3.0-or-later
 */
 
#ifndef INCLUDED_volk_32fc_s32f_power_32fc_a_H
#define INCLUDED_volk_32fc_s32f_power_32fc_a_H
 
#include <inttypes.h>
#include <math.h>
#include <stdio.h>
 
static inline lv_32fc_t __volk_s32fc_s32f_power_s32fc_a(const lv_32fc_t exp,
                                                        const float power)
{
    const float arg = power * atan2f(lv_creal(exp), lv_cimag(exp));
    const float mag =
        powf(lv_creal(exp) * lv_creal(exp) + lv_cimag(exp) * lv_cimag(exp), power / 2);
    return mag * lv_cmake(-cosf(arg), sinf(arg));
}
 
#ifdef LV_HAVE_SSE
#include <xmmintrin.h>
 
#ifdef LV_HAVE_LIB_SIMDMATH
#include <simdmath.h>
#endif /* LV_HAVE_LIB_SIMDMATH */
 
static inline void volk_32fc_s32f_power_32fc_a_sse(lv_32fc_t* cVector,
                                                   const lv_32fc_t* aVector,
                                                   const float power,
                                                   unsigned int num_points)
{
    unsigned int number = 0;
 
    lv_32fc_t* cPtr = cVector;
    const lv_32fc_t* aPtr = aVector;
 
#ifdef LV_HAVE_LIB_SIMDMATH
    const unsigned int quarterPoints = num_points / 4;
    __m128 vPower = _mm_set_ps1(power);
 
    __m128 cplxValue1, cplxValue2, magnitude, phase, iValue, qValue;
    for (; number < quarterPoints; number++) {
 
        cplxValue1 = _mm_load_ps((float*)aPtr);
        aPtr += 2;
 
        cplxValue2 = _mm_load_ps((float*)aPtr);
        aPtr += 2;
 
        // Convert to polar coordinates
 
        // Arrange in i1i2i3i4 format
        iValue = _mm_shuffle_ps(cplxValue1, cplxValue2, _MM_SHUFFLE(2, 0, 2, 0));
        // Arrange in q1q2q3q4 format
        qValue = _mm_shuffle_ps(cplxValue1, cplxValue2, _MM_SHUFFLE(3, 1, 3, 1));
 
        phase = atan2f4(qValue, iValue); // Calculate the Phase
 
        magnitude = _mm_sqrt_ps(
            _mm_add_ps(_mm_mul_ps(iValue, iValue),
                       _mm_mul_ps(qValue, qValue))); // Calculate the magnitude by square
                                                     // rooting the added I2 and Q2 values
 
        // Now calculate the power of the polar coordinate data
        magnitude = powf4(magnitude, vPower); // Take the magnitude to the specified power
 
        phase = _mm_mul_ps(phase, vPower); // Multiply the phase by the specified power
 
        // Convert back to cartesian coordinates
        iValue = _mm_mul_ps(cosf4(phase),
                            magnitude); // Multiply the cos of the phase by the magnitude
        qValue = _mm_mul_ps(sinf4(phase),
                            magnitude); // Multiply the sin of the phase by the magnitude
 
        cplxValue1 =
            _mm_unpacklo_ps(iValue, qValue); // Interleave the lower two i & q values
        cplxValue2 =
            _mm_unpackhi_ps(iValue, qValue); // Interleave the upper two i & q values
 
        _mm_store_ps((float*)cPtr,
                     cplxValue1); // Store the results back into the C container
 
        cPtr += 2;
 
        _mm_store_ps((float*)cPtr,
                     cplxValue2); // Store the results back into the C container
 
        cPtr += 2;
    }
 
    number = quarterPoints * 4;
#endif /* LV_HAVE_LIB_SIMDMATH */
 
    for (; number < num_points; number++) {
        *cPtr++ = __volk_s32fc_s32f_power_s32fc_a((*aPtr++), power);
    }
}
#endif /* LV_HAVE_SSE */
 
 
#ifdef LV_HAVE_GENERIC
 
static inline void volk_32fc_s32f_power_32fc_generic(lv_32fc_t* cVector,
                                                     const lv_32fc_t* aVector,
                                                     const float power,
                                                     unsigned int num_points)
{
    lv_32fc_t* cPtr = cVector;
    const lv_32fc_t* aPtr = aVector;
    unsigned int number = 0;
 
    for (number = 0; number < num_points; number++) {
        *cPtr++ = __volk_s32fc_s32f_power_s32fc_a((*aPtr++), power);
    }
}
 
#endif /* LV_HAVE_GENERIC */
 
 
#endif /* INCLUDED_volk_32fc_s32f_power_32fc_a_H */