Vector Optimized Library of Kernels  3.1.2
Architecture-tuned implementations of math kernels
volk_16i_max_star_16i.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2012, 2014 Free Software Foundation, Inc.
4  *
5  * This file is part of VOLK
6  *
7  * SPDX-License-Identifier: LGPL-3.0-or-later
8  */
9 
40 #ifndef INCLUDED_volk_16i_max_star_16i_a_H
41 #define INCLUDED_volk_16i_max_star_16i_a_H
42 
43 #include <inttypes.h>
44 #include <stdio.h>
45 
46 #ifdef LV_HAVE_SSSE3
47 
48 #include <emmintrin.h>
49 #include <tmmintrin.h>
50 #include <xmmintrin.h>
51 
52 static inline void
53 volk_16i_max_star_16i_a_ssse3(short* target, short* src0, unsigned int num_points)
54 {
55  const unsigned int num_bytes = num_points * 2;
56 
57  short candidate = src0[0];
58  short cands[8];
59  __m128i xmm0, xmm1, xmm3, xmm4, xmm5, xmm6;
60 
61  __m128i* p_src0;
62 
63  p_src0 = (__m128i*)src0;
64 
65  int bound = num_bytes >> 4;
66  int leftovers = (num_bytes >> 1) & 7;
67 
68  int i = 0;
69 
70  xmm1 = _mm_setzero_si128();
71  xmm0 = _mm_setzero_si128();
72  //_mm_insert_epi16(xmm0, candidate, 0);
73 
74  xmm0 = _mm_shuffle_epi8(xmm0, xmm1);
75 
76  for (i = 0; i < bound; ++i) {
77  xmm1 = _mm_load_si128(p_src0);
78  p_src0 += 1;
79  // xmm2 = _mm_sub_epi16(xmm1, xmm0);
80 
81  xmm3 = _mm_cmpgt_epi16(xmm0, xmm1);
82  xmm4 = _mm_cmpeq_epi16(xmm0, xmm1);
83  xmm5 = _mm_cmpgt_epi16(xmm1, xmm0);
84 
85  xmm6 = _mm_xor_si128(xmm4, xmm5);
86 
87  xmm3 = _mm_and_si128(xmm3, xmm0);
88  xmm4 = _mm_and_si128(xmm6, xmm1);
89 
90  xmm0 = _mm_add_epi16(xmm3, xmm4);
91  }
92 
93  _mm_store_si128((__m128i*)cands, xmm0);
94 
95  for (i = 0; i < 8; ++i) {
96  candidate = ((short)(candidate - cands[i]) > 0) ? candidate : cands[i];
97  }
98 
99  for (i = 0; i < leftovers; ++i) {
100  candidate = ((short)(candidate - src0[(bound << 3) + i]) > 0)
101  ? candidate
102  : src0[(bound << 3) + i];
103  }
104 
105  target[0] = candidate;
106 }
107 
108 #endif /*LV_HAVE_SSSE3*/
109 
110 #ifdef LV_HAVE_GENERIC
111 
112 static inline void
113 volk_16i_max_star_16i_generic(short* target, short* src0, unsigned int num_points)
114 {
115  const unsigned int num_bytes = num_points * 2;
116 
117  int i = 0;
118 
119  int bound = num_bytes >> 1;
120 
121  short candidate = src0[0];
122  for (i = 1; i < bound; ++i) {
123  candidate = ((short)(candidate - src0[i]) > 0) ? candidate : src0[i];
124  }
125  target[0] = candidate;
126 }
127 
128 #endif /*LV_HAVE_GENERIC*/
129 
130 
131 #endif /*INCLUDED_volk_16i_max_star_16i_a_H*/
static void volk_16i_max_star_16i_a_ssse3(short *target, short *src0, unsigned int num_points)
Definition: volk_16i_max_star_16i.h:53
static void volk_16i_max_star_16i_generic(short *target, short *src0, unsigned int num_points)
Definition: volk_16i_max_star_16i.h:113
for i
Definition: volk_config_fixed.tmpl.h:13