/* -*- 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_32fc_x2_multiply_32fc
 *
 * \b Overview
 *
 * Multiplies two complex vectors and returns the complex result.
 *
 * <b>Dispatcher Prototype</b>
 * \code
 * void volk_32fc_x2_multiply_32fc(lv_32fc_t* cVector, const lv_32fc_t* aVector, const lv_32fc_t* bVector, unsigned int num_points);
 * \endcode
 *
 * \b Inputs
 * \li aVector: The first input vector of complex floats.
 * \li bVector: The second input vector of complex floats.
 * \li num_points: The number of data points.
 *
 * \b Outputs
 * \li outputVector: The output vector complex floats.
 *
 * \b Example
 * Mix two signals at f=0.3 and 0.1.
 * \code
 *   int N = 10;
 *   unsigned int alignment = volk_get_alignment();
 *   lv_32fc_t* sig_1  = (lv_32fc_t*)volk_malloc(sizeof(lv_32fc_t)*N, alignment);
 *   lv_32fc_t* sig_2  = (lv_32fc_t*)volk_malloc(sizeof(lv_32fc_t)*N, alignment);
 *   lv_32fc_t* out = (lv_32fc_t*)volk_malloc(sizeof(lv_32fc_t)*N, alignment);
 *
 *   for(unsigned int ii = 0; ii < N; ++ii){
 *       // Generate two tones
 *       float real_1 = std::cos(0.3f * (float)ii);
 *       float imag_1 = std::sin(0.3f * (float)ii);
 *       sig_1[ii] = lv_cmake(real_1, imag_1);
 *       float real_2 = std::cos(0.1f * (float)ii);
 *       float imag_2 = std::sin(0.1f * (float)ii);
 *       sig_2[ii] = lv_cmake(real_2, imag_2);
 *   }
 *
 *   volk_32fc_x2_multiply_32fc(out, sig_1, sig_2, N);
 * *
 *   volk_free(sig_1);
 *   volk_free(sig_2);
 *   volk_free(out);
 * \endcode
 */

#ifndef INCLUDED_volk_32fc_x2_multiply_32fc_u_H
#define INCLUDED_volk_32fc_x2_multiply_32fc_u_H

#include <inttypes.h>
#include <stdio.h>
#include <volk/volk_complex.h>
#include <float.h>

#if LV_HAVE_AVX2 && LV_HAVE_FMA
#include <immintrin.h>
/*!
  \brief Multiplies the two input complex vectors and stores their results in the third vector
  \param cVector The vector where the results will be stored
  \param aVector One of the vectors to be multiplied
  \param bVector One of the vectors to be multiplied
  \param num_points The number of complex values in aVector and bVector to be multiplied together and stored into cVector
*/
static inline void volk_32fc_x2_multiply_32fc_u_avx2_fma(lv_32fc_t* cVector, const lv_32fc_t* aVector, const lv_32fc_t* bVector, unsigned int num_points){
  unsigned int number = 0;
  const unsigned int quarterPoints = num_points / 4;

  lv_32fc_t* c = cVector;
  const lv_32fc_t* a = aVector;
  const lv_32fc_t* b = bVector;

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

    const __m256 x = _mm256_loadu_ps((float*)a); // Load the ar + ai, br + bi as ar,ai,br,bi
    const __m256 y = _mm256_loadu_ps((float*)b); // Load the cr + ci, dr + di as cr,ci,dr,di

    const __m256 yl = _mm256_moveldup_ps(y); // Load yl with cr,cr,dr,dr
    const __m256 yh = _mm256_movehdup_ps(y); // Load yh with ci,ci,di,di

    const __m256 tmp2x = _mm256_permute_ps(x,0xB1); // Re-arrange x to be ai,ar,bi,br

    const __m256 tmp2 = _mm256_mul_ps(tmp2x, yh); // tmp2 = ai*ci,ar*ci,bi*di,br*di

    const __m256 z = _mm256_fmaddsub_ps(x, yl, tmp2); // ar*cr-ai*ci, ai*cr+ar*ci, br*dr-bi*di, bi*dr+br*di

    _mm256_storeu_ps((float*)c,z); // Store the results back into the C container

    a += 4;
    b += 4;
    c += 4;
  }

  _mm256_zeroupper();

  number = quarterPoints * 4;
  for(;number < num_points; number++){
    *c++ = (*a++) * (*b++);
  }
}
#endif /* LV_HAVE_AVX2 && LV_HAVE_FMA */


#ifdef LV_HAVE_AVX
#include <immintrin.h>
#include <volk/volk_avx_intrinsics.h>

static inline void
volk_32fc_x2_multiply_32fc_u_avx(lv_32fc_t* cVector, const lv_32fc_t* aVector,
                                 const lv_32fc_t* bVector, unsigned int num_points)
{
  unsigned int number = 0;
  const unsigned int quarterPoints = num_points / 4;

  __m256 x, y, z;
  lv_32fc_t* c = cVector;
  const lv_32fc_t* a = aVector;
  const lv_32fc_t* b = bVector;

  for(; number < quarterPoints; number++){
    x = _mm256_loadu_ps((float*) a); // Load the ar + ai, br + bi ... as ar,ai,br,bi ...
    y = _mm256_loadu_ps((float*) b); // Load the cr + ci, dr + di ... as cr,ci,dr,di ...
    z = _mm256_complexmul_ps(x, y);
    _mm256_storeu_ps((float*) c, z); // Store the results back into the C container

    a += 4;
    b += 4;
    c += 4;
  }

  number = quarterPoints * 4;

  for(; number < num_points; number++){
    *c++ = (*a++) * (*b++);
  }
}
#endif /* LV_HAVE_AVX */


#ifdef LV_HAVE_SSE3
#include <pmmintrin.h>
#include <volk/volk_sse3_intrinsics.h>

static inline void
volk_32fc_x2_multiply_32fc_u_sse3(lv_32fc_t* cVector, const lv_32fc_t* aVector,
                                  const lv_32fc_t* bVector, unsigned int num_points)
{
  unsigned int number = 0;
  const unsigned int halfPoints = num_points / 2;

  __m128 x, y, z;
  lv_32fc_t* c = cVector;
  const lv_32fc_t* a = aVector;
  const lv_32fc_t* b = bVector;

  for(; number < halfPoints; number++){
    x = _mm_loadu_ps((float*) a); // Load the ar + ai, br + bi as ar,ai,br,bi
    y = _mm_loadu_ps((float*) b); // Load the cr + ci, dr + di as cr,ci,dr,di
    z = _mm_complexmul_ps(x, y);
    _mm_storeu_ps((float*) c, z); // Store the results back into the C container

    a += 2;
    b += 2;
    c += 2;
  }

  if((num_points % 2) != 0){
    *c = (*a) * (*b);
  }
}
#endif /* LV_HAVE_SSE */


#ifdef LV_HAVE_GENERIC

static inline void
volk_32fc_x2_multiply_32fc_generic(lv_32fc_t* cVector, const lv_32fc_t* aVector,
                                   const lv_32fc_t* bVector, unsigned int num_points)
{
  lv_32fc_t* cPtr = cVector;
  const lv_32fc_t* aPtr = aVector;
  const lv_32fc_t* bPtr=  bVector;
  unsigned int number = 0;

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


#endif /* INCLUDED_volk_32fc_x2_multiply_32fc_u_H */
#ifndef INCLUDED_volk_32fc_x2_multiply_32fc_a_H
#define INCLUDED_volk_32fc_x2_multiply_32fc_a_H

#include <inttypes.h>
#include <stdio.h>
#include <volk/volk_complex.h>
#include <float.h>

#if LV_HAVE_AVX2 && LV_HAVE_FMA
#include <immintrin.h>
/*!
  \brief Multiplies the two input complex vectors and stores their results in the third vector
  \param cVector The vector where the results will be stored
  \param aVector One of the vectors to be multiplied
  \param bVector One of the vectors to be multiplied
  \param num_points The number of complex values in aVector and bVector to be multiplied together and stored into cVector
*/
static inline void volk_32fc_x2_multiply_32fc_a_avx2_fma(lv_32fc_t* cVector, const lv_32fc_t* aVector, const lv_32fc_t* bVector, unsigned int num_points){
  unsigned int number = 0;
  const unsigned int quarterPoints = num_points / 4;

  lv_32fc_t* c = cVector;
  const lv_32fc_t* a = aVector;
  const lv_32fc_t* b = bVector;

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

    const __m256 x = _mm256_load_ps((float*)a); // Load the ar + ai, br + bi as ar,ai,br,bi
    const __m256 y = _mm256_load_ps((float*)b); // Load the cr + ci, dr + di as cr,ci,dr,di

    const __m256 yl = _mm256_moveldup_ps(y); // Load yl with cr,cr,dr,dr
    const __m256 yh = _mm256_movehdup_ps(y); // Load yh with ci,ci,di,di

    const __m256 tmp2x = _mm256_permute_ps(x,0xB1); // Re-arrange x to be ai,ar,bi,br

    const __m256 tmp2 = _mm256_mul_ps(tmp2x, yh); // tmp2 = ai*ci,ar*ci,bi*di,br*di

    const __m256 z = _mm256_fmaddsub_ps(x, yl, tmp2); // ar*cr-ai*ci, ai*cr+ar*ci, br*dr-bi*di, bi*dr+br*di

    _mm256_store_ps((float*)c,z); // Store the results back into the C container

    a += 4;
    b += 4;
    c += 4;
  }

  _mm256_zeroupper();

  number = quarterPoints * 4;
  for(;number < num_points; number++){
    *c++ = (*a++) * (*b++);
  }
}
#endif /* LV_HAVE_AVX2 && LV_HAVE_FMA */


#ifdef LV_HAVE_AVX
#include <immintrin.h>
#include <volk/volk_avx_intrinsics.h>

static inline void
volk_32fc_x2_multiply_32fc_a_avx(lv_32fc_t* cVector, const lv_32fc_t* aVector,
                                 const lv_32fc_t* bVector, unsigned int num_points)
{
  unsigned int number = 0;
  const unsigned int quarterPoints = num_points / 4;

  __m256 x, y, z;
  lv_32fc_t* c = cVector;
  const lv_32fc_t* a = aVector;
  const lv_32fc_t* b = bVector;

  for(; number < quarterPoints; number++){
    x = _mm256_load_ps((float*) a); // Load the ar + ai, br + bi ... as ar,ai,br,bi ...
    y = _mm256_load_ps((float*) b); // Load the cr + ci, dr + di ... as cr,ci,dr,di ...
    z = _mm256_complexmul_ps(x, y);
    _mm256_store_ps((float*) c, z); // Store the results back into the C container

    a += 4;
    b += 4;
    c += 4;
  }

  number = quarterPoints * 4;

  for(; number < num_points; number++){
    *c++ = (*a++) * (*b++);
  }
}
#endif /* LV_HAVE_AVX */

#ifdef LV_HAVE_SSE3
#include <pmmintrin.h>
#include <volk/volk_sse3_intrinsics.h>

static inline void
volk_32fc_x2_multiply_32fc_a_sse3(lv_32fc_t* cVector, const lv_32fc_t* aVector,
                                  const lv_32fc_t* bVector, unsigned int num_points)
{
  unsigned int number = 0;
  const unsigned int halfPoints = num_points / 2;

  __m128 x, y, z;
  lv_32fc_t* c = cVector;
  const lv_32fc_t* a = aVector;
  const lv_32fc_t* b = bVector;

  for(; number < halfPoints; number++){
    x = _mm_load_ps((float*) a); // Load the ar + ai, br + bi as ar,ai,br,bi
    y = _mm_load_ps((float*) b); // Load the cr + ci, dr + di as cr,ci,dr,di
    z = _mm_complexmul_ps(x, y);
    _mm_store_ps((float*) c, z); // Store the results back into the C container

    a += 2;
    b += 2;
    c += 2;
  }

  if((num_points % 2) != 0){
    *c = (*a) * (*b);
  }
}
#endif /* LV_HAVE_SSE */


#ifdef LV_HAVE_GENERIC

static inline void
volk_32fc_x2_multiply_32fc_a_generic(lv_32fc_t* cVector, const lv_32fc_t* aVector,
                                     const lv_32fc_t* bVector, unsigned int num_points)
{
  lv_32fc_t* cPtr = cVector;
  const lv_32fc_t* aPtr = aVector;
  const lv_32fc_t* bPtr=  bVector;
  unsigned int number = 0;

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


#ifdef LV_HAVE_NEON
#include <arm_neon.h>

static inline void
volk_32fc_x2_multiply_32fc_neon(lv_32fc_t* cVector, const lv_32fc_t* aVector,
                                const lv_32fc_t* bVector, unsigned int num_points)
{
  lv_32fc_t *a_ptr = (lv_32fc_t*) aVector;
  lv_32fc_t *b_ptr = (lv_32fc_t*) bVector;
  unsigned int quarter_points = num_points / 4;
  float32x4x2_t a_val, b_val, c_val;
  float32x4x2_t tmp_real, tmp_imag;
  unsigned int number = 0;

  for(number = 0; number < quarter_points; ++number) {
    a_val = vld2q_f32((float*)a_ptr); // a0r|a1r|a2r|a3r || a0i|a1i|a2i|a3i
    b_val = vld2q_f32((float*)b_ptr); // b0r|b1r|b2r|b3r || b0i|b1i|b2i|b3i
    __VOLK_PREFETCH(a_ptr+4);
    __VOLK_PREFETCH(b_ptr+4);

    // multiply the real*real and imag*imag to get real result
    // a0r*b0r|a1r*b1r|a2r*b2r|a3r*b3r
    tmp_real.val[0] = vmulq_f32(a_val.val[0], b_val.val[0]);
    // a0i*b0i|a1i*b1i|a2i*b2i|a3i*b3i
    tmp_real.val[1] = vmulq_f32(a_val.val[1], b_val.val[1]);

    // Multiply cross terms to get the imaginary result
    // a0r*b0i|a1r*b1i|a2r*b2i|a3r*b3i
    tmp_imag.val[0] = vmulq_f32(a_val.val[0], b_val.val[1]);
    // a0i*b0r|a1i*b1r|a2i*b2r|a3i*b3r
    tmp_imag.val[1] = vmulq_f32(a_val.val[1], b_val.val[0]);

    // store the results
    c_val.val[0] = vsubq_f32(tmp_real.val[0], tmp_real.val[1]);
    c_val.val[1] = vaddq_f32(tmp_imag.val[0], tmp_imag.val[1]);
    vst2q_f32((float*)cVector, c_val);

    a_ptr += 4;
    b_ptr += 4;
    cVector += 4;
  }

  for(number = quarter_points*4; number < num_points; number++){
    *cVector++ = (*a_ptr++) * (*b_ptr++);
  }
}
#endif /* LV_HAVE_NEON */


#ifdef LV_HAVE_NEON

static inline void
volk_32fc_x2_multiply_32fc_neon_opttests(lv_32fc_t* cVector, const lv_32fc_t* aVector,
                                         const lv_32fc_t* bVector, unsigned int num_points)
{
  lv_32fc_t *a_ptr = (lv_32fc_t*) aVector;
  lv_32fc_t *b_ptr = (lv_32fc_t*) bVector;
  unsigned int quarter_points = num_points / 4;
  float32x4x2_t a_val, b_val;
  float32x4x2_t tmp_imag;
  unsigned int number = 0;

  for(number = 0; number < quarter_points; ++number) {
    a_val = vld2q_f32((float*)a_ptr); // a0r|a1r|a2r|a3r || a0i|a1i|a2i|a3i
    b_val = vld2q_f32((float*)b_ptr); // b0r|b1r|b2r|b3r || b0i|b1i|b2i|b3i
    __VOLK_PREFETCH(a_ptr+4);
    __VOLK_PREFETCH(b_ptr+4);

    // do the first multiply
    tmp_imag.val[1] = vmulq_f32(a_val.val[1], b_val.val[0]);
    tmp_imag.val[0] = vmulq_f32(a_val.val[0], b_val.val[0]);

    // use multiply accumulate/subtract to get result
    tmp_imag.val[1] = vmlaq_f32(tmp_imag.val[1], a_val.val[0], b_val.val[1]);
    tmp_imag.val[0] = vmlsq_f32(tmp_imag.val[0], a_val.val[1], b_val.val[1]);

    // store
    vst2q_f32((float*)cVector, tmp_imag);
    // increment pointers
    a_ptr += 4;
    b_ptr += 4;
    cVector += 4;
  }

  for(number = quarter_points*4; number < num_points; number++){
    *cVector++ = (*a_ptr++) * (*b_ptr++);
  }
}
#endif /* LV_HAVE_NEON */


#ifdef LV_HAVE_NEON

extern void
volk_32fc_x2_multiply_32fc_a_neonasm(lv_32fc_t* cVector, const lv_32fc_t* aVector,
                                   const lv_32fc_t* bVector, unsigned int num_points);
#endif /* LV_HAVE_NEON */


#ifdef LV_HAVE_ORC

extern void
volk_32fc_x2_multiply_32fc_a_orc_impl(lv_32fc_t* cVector, const lv_32fc_t* aVector,
                                      const lv_32fc_t* bVector, unsigned int num_points);

static inline void
volk_32fc_x2_multiply_32fc_u_orc(lv_32fc_t* cVector, const lv_32fc_t* aVector,
                                 const lv_32fc_t* bVector, unsigned int num_points)
{
  volk_32fc_x2_multiply_32fc_a_orc_impl(cVector, aVector, bVector, num_points);
}

#endif /* LV_HAVE_ORC */

#endif /* INCLUDED_volk_32fc_x2_multiply_32fc_a_H */
