volk_sse3_intrinsics.h

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/* -*- c++ -*- */
/*
 * Copyright 2015 Free Software Foundation, Inc.
 *
 * This file is part of VOLK
 *
 * SPDX-License-Identifier: LGPL-3.0-or-later
 */
 
/*
 * 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_ */