/* -*- c++ -*- */
/* 
 * Copyright 2015 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.
 */

/*
 * This file is intended to hold SSE3 intrinsics of intrinsics.
 * They should be used in VOLK kernels to avoid copy-pasta.
 */

#ifndef INCLUDE_VOLK_VOLK_SSE3_INTRINSICS_H_
#define INCLUDE_VOLK_VOLK_SSE3_INTRINSICS_H_
#include <pmmintrin.h>

static inline __m128
_mm_complexmul_ps(__m128 x, __m128 y)
{
  __m128 yl, yh, tmp1, tmp2;
  yl = _mm_moveldup_ps(y); // Load yl with cr,cr,dr,dr
  yh = _mm_movehdup_ps(y); // Load yh with ci,ci,di,di
  tmp1 = _mm_mul_ps(x, yl); // tmp1 = ar*cr,ai*cr,br*dr,bi*dr
  x = _mm_shuffle_ps(x, x, 0xB1); // Re-arrange x to be ai,ar,bi,br
  tmp2 = _mm_mul_ps(x, yh); // tmp2 = ai*ci,ar*ci,bi*di,br*di
  return _mm_addsub_ps(tmp1, tmp2); // ar*cr-ai*ci, ai*cr+ar*ci, br*dr-bi*di, bi*dr+br*di
}

static inline __m128
_mm_complexconjugatemul_ps(__m128 x, __m128 y)
{
  const __m128 conjugator = _mm_setr_ps(0, -0.f, 0, -0.f);
  y = _mm_xor_ps(y, conjugator); // conjugate y
  return _mm_complexmul_ps(x, y);
}

static inline __m128
_mm_magnitudesquared_ps_sse3(__m128 cplxValue1, __m128 cplxValue2){
  cplxValue1 = _mm_mul_ps(cplxValue1, cplxValue1); // Square the values
  cplxValue2 = _mm_mul_ps(cplxValue2, cplxValue2); // Square the Values
  return _mm_hadd_ps(cplxValue1, cplxValue2); // Add the I2 and Q2 values
}

static inline __m128
_mm_magnitude_ps_sse3(__m128 cplxValue1, __m128 cplxValue2){
  return _mm_sqrt_ps(_mm_magnitudesquared_ps_sse3(cplxValue1, cplxValue2));
}

static inline __m128
_mm_scaled_norm_dist_ps_sse3(const __m128 symbols0, const __m128 symbols1, const __m128 points0, const __m128 points1, const __m128 scalar){
  /*
   * Calculate: |y - x|^2 * SNR_lin
   * Consider 'symbolsX' and 'pointsX' to be complex float
   * 'symbolsX' are 'y' and 'pointsX' are 'x'
   */
  const __m128 diff0 = _mm_sub_ps(symbols0, points0);
  const __m128 diff1 = _mm_sub_ps(symbols1, points1);
  const __m128 norms = _mm_magnitudesquared_ps_sse3(diff0, diff1);
  return _mm_mul_ps(norms, scalar);
}

#endif /* INCLUDE_VOLK_VOLK_SSE3_INTRINSICS_H_ */
