Vector Optimized Library of Kernels  3.2.0
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 
44 #ifndef INCLUDED_volk_16i_max_star_16i_a_H
45 #define INCLUDED_volk_16i_max_star_16i_a_H
46 
47 #include <inttypes.h>
48 #include <stdio.h>
49 
50 #ifdef LV_HAVE_SSSE3
51 
52 #include <emmintrin.h>
53 #include <tmmintrin.h>
54 #include <xmmintrin.h>
55 
56 static inline void
57 volk_16i_max_star_16i_a_ssse3(short* target, short* src0, unsigned int num_points)
58 {
59  const unsigned int num_bytes = num_points * 2;
60 
61  short candidate = src0[0];
62  short cands[8];
63  __m128i xmm0, xmm1, xmm3, xmm4, xmm5, xmm6;
64 
65  __m128i* p_src0;
66 
67  p_src0 = (__m128i*)src0;
68 
69  int bound = num_bytes >> 4;
70  int leftovers = (num_bytes >> 1) & 7;
71 
72  int i = 0;
73 
74  xmm1 = _mm_setzero_si128();
75  xmm0 = _mm_setzero_si128();
76  //_mm_insert_epi16(xmm0, candidate, 0);
77 
78  xmm0 = _mm_shuffle_epi8(xmm0, xmm1);
79 
80  for (i = 0; i < bound; ++i) {
81  xmm1 = _mm_load_si128(p_src0);
82  p_src0 += 1;
83  // xmm2 = _mm_sub_epi16(xmm1, xmm0);
84 
85  xmm3 = _mm_cmpgt_epi16(xmm0, xmm1);
86  xmm4 = _mm_cmpeq_epi16(xmm0, xmm1);
87  xmm5 = _mm_cmpgt_epi16(xmm1, xmm0);
88 
89  xmm6 = _mm_xor_si128(xmm4, xmm5);
90 
91  xmm3 = _mm_and_si128(xmm3, xmm0);
92  xmm4 = _mm_and_si128(xmm6, xmm1);
93 
94  xmm0 = _mm_add_epi16(xmm3, xmm4);
95  }
96 
97  _mm_store_si128((__m128i*)cands, xmm0);
98 
99  for (i = 0; i < 8; ++i) {
100  candidate = ((short)(candidate - cands[i]) > 0) ? candidate : cands[i];
101  }
102 
103  for (i = 0; i < leftovers; ++i) {
104  candidate = ((short)(candidate - src0[(bound << 3) + i]) > 0)
105  ? candidate
106  : src0[(bound << 3) + i];
107  }
108 
109  target[0] = candidate;
110 }
111 
112 #endif /*LV_HAVE_SSSE3*/
113 
114 #ifdef LV_HAVE_GENERIC
115 
116 static inline void
117 volk_16i_max_star_16i_generic(short* target, short* src0, unsigned int num_points)
118 {
119  const unsigned int num_bytes = num_points * 2;
120 
121  int i = 0;
122 
123  int bound = num_bytes >> 1;
124 
125  short candidate = src0[0];
126  for (i = 1; i < bound; ++i) {
127  candidate = ((short)(candidate - src0[i]) > 0) ? candidate : src0[i];
128  }
129  target[0] = candidate;
130 }
131 
132 #endif /*LV_HAVE_GENERIC*/
133 
134 
135 #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:57
static void volk_16i_max_star_16i_generic(short *target, short *src0, unsigned int num_points)
Definition: volk_16i_max_star_16i.h:117
for i
Definition: volk_config_fixed.tmpl.h:13