1 /* -*- c++ -*- */
2 /*
3 * Copyright 2015 Free Software Foundation, Inc.
4 *
5 * This file is part of GNU Radio
6 *
7 * GNU Radio is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3, or (at your option)
10 * any later version.
11 *
12 * GNU Radio is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Radio; see the file COPYING. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street,
20 * Boston, MA 02110-1301, USA.
21 */
22
23 /*
24 * This file is intended to hold SSE3 intrinsics of intrinsics.
25 * They should be used in VOLK kernels to avoid copy-pasta.
26 */
27
28 #ifndef INCLUDE_VOLK_VOLK_SSE3_INTRINSICS_H_
29 #define INCLUDE_VOLK_VOLK_SSE3_INTRINSICS_H_
30 #include <pmmintrin.h>
31
32 static inline __m128
_mm_complexmul_ps(__m128 x,__m128 y)33 _mm_complexmul_ps(__m128 x, __m128 y)
34 {
35 __m128 yl, yh, tmp1, tmp2;
36 yl = _mm_moveldup_ps(y); // Load yl with cr,cr,dr,dr
37 yh = _mm_movehdup_ps(y); // Load yh with ci,ci,di,di
38 tmp1 = _mm_mul_ps(x, yl); // tmp1 = ar*cr,ai*cr,br*dr,bi*dr
39 x = _mm_shuffle_ps(x, x, 0xB1); // Re-arrange x to be ai,ar,bi,br
40 tmp2 = _mm_mul_ps(x, yh); // tmp2 = ai*ci,ar*ci,bi*di,br*di
41 return _mm_addsub_ps(tmp1, tmp2); // ar*cr-ai*ci, ai*cr+ar*ci, br*dr-bi*di, bi*dr+br*di
42 }
43
44 static inline __m128
_mm_complexconjugatemul_ps(__m128 x,__m128 y)45 _mm_complexconjugatemul_ps(__m128 x, __m128 y)
46 {
47 const __m128 conjugator = _mm_setr_ps(0, -0.f, 0, -0.f);
48 y = _mm_xor_ps(y, conjugator); // conjugate y
49 return _mm_complexmul_ps(x, y);
50 }
51
52 static inline __m128
_mm_magnitudesquared_ps_sse3(__m128 cplxValue1,__m128 cplxValue2)53 _mm_magnitudesquared_ps_sse3(__m128 cplxValue1, __m128 cplxValue2){
54 cplxValue1 = _mm_mul_ps(cplxValue1, cplxValue1); // Square the values
55 cplxValue2 = _mm_mul_ps(cplxValue2, cplxValue2); // Square the Values
56 return _mm_hadd_ps(cplxValue1, cplxValue2); // Add the I2 and Q2 values
57 }
58
59 static inline __m128
_mm_magnitude_ps_sse3(__m128 cplxValue1,__m128 cplxValue2)60 _mm_magnitude_ps_sse3(__m128 cplxValue1, __m128 cplxValue2){
61 return _mm_sqrt_ps(_mm_magnitudesquared_ps_sse3(cplxValue1, cplxValue2));
62 }
63
64 static inline __m128
_mm_scaled_norm_dist_ps_sse3(const __m128 symbols0,const __m128 symbols1,const __m128 points0,const __m128 points1,const __m128 scalar)65 _mm_scaled_norm_dist_ps_sse3(const __m128 symbols0, const __m128 symbols1, const __m128 points0, const __m128 points1, const __m128 scalar){
66 /*
67 * Calculate: |y - x|^2 * SNR_lin
68 * Consider 'symbolsX' and 'pointsX' to be complex float
69 * 'symbolsX' are 'y' and 'pointsX' are 'x'
70 */
71 const __m128 diff0 = _mm_sub_ps(symbols0, points0);
72 const __m128 diff1 = _mm_sub_ps(symbols1, points1);
73 const __m128 norms = _mm_magnitudesquared_ps_sse3(diff0, diff1);
74 return _mm_mul_ps(norms, scalar);
75 }
76
77 #endif /* INCLUDE_VOLK_VOLK_SSE3_INTRINSICS_H_ */
78