DPDK  2.2.0
rte_cmp_x86.h
1 /*-
2  * BSD LICENSE
3  *
4  * Copyright(c) 2015 Intel Corporation. All rights reserved.
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  *
11  * * Redistributions of source code must retain the above copyright
12  * notice, this list of conditions and the following disclaimer.
13  * * Redistributions in binary form must reproduce the above copyright
14  * notice, this list of conditions and the following disclaimer in
15  * the documentation and/or other materials provided with the
16  * distribution.
17  * * Neither the name of Intel Corporation nor the names of its
18  * contributors may be used to endorse or promote products derived
19  * from this software without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32  */
33 
34 /* Functions to compare multiple of 16 byte keys (up to 128 bytes) */
35 static int
36 rte_hash_k16_cmp_eq(const void *key1, const void *key2, size_t key_len __rte_unused)
37 {
38  const __m128i k1 = _mm_loadu_si128((const __m128i *) key1);
39  const __m128i k2 = _mm_loadu_si128((const __m128i *) key2);
40 #ifdef RTE_MACHINE_CPUFLAG_SSE4_1
41  const __m128i x = _mm_xor_si128(k1, k2);
42 
43  return !_mm_test_all_zeros(x, x);
44 #else
45  const __m128i x = _mm_cmpeq_epi32(k1, k2);
46 
47  return (_mm_movemask_epi8(x) != 0xffff);
48 #endif
49 }
50 
51 static int
52 rte_hash_k32_cmp_eq(const void *key1, const void *key2, size_t key_len)
53 {
54  return rte_hash_k16_cmp_eq(key1, key2, key_len) ||
55  rte_hash_k16_cmp_eq((const char *) key1 + 16,
56  (const char *) key2 + 16, key_len);
57 }
58 
59 static int
60 rte_hash_k48_cmp_eq(const void *key1, const void *key2, size_t key_len)
61 {
62  return rte_hash_k16_cmp_eq(key1, key2, key_len) ||
63  rte_hash_k16_cmp_eq((const char *) key1 + 16,
64  (const char *) key2 + 16, key_len) ||
65  rte_hash_k16_cmp_eq((const char *) key1 + 32,
66  (const char *) key2 + 32, key_len);
67 }
68 
69 static int
70 rte_hash_k64_cmp_eq(const void *key1, const void *key2, size_t key_len)
71 {
72  return rte_hash_k32_cmp_eq(key1, key2, key_len) ||
73  rte_hash_k32_cmp_eq((const char *) key1 + 32,
74  (const char *) key2 + 32, key_len);
75 }
76 
77 static int
78 rte_hash_k80_cmp_eq(const void *key1, const void *key2, size_t key_len)
79 {
80  return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
81  rte_hash_k16_cmp_eq((const char *) key1 + 64,
82  (const char *) key2 + 64, key_len);
83 }
84 
85 static int
86 rte_hash_k96_cmp_eq(const void *key1, const void *key2, size_t key_len)
87 {
88  return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
89  rte_hash_k32_cmp_eq((const char *) key1 + 64,
90  (const char *) key2 + 64, key_len);
91 }
92 
93 static int
94 rte_hash_k112_cmp_eq(const void *key1, const void *key2, size_t key_len)
95 {
96  return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
97  rte_hash_k32_cmp_eq((const char *) key1 + 64,
98  (const char *) key2 + 64, key_len) ||
99  rte_hash_k16_cmp_eq((const char *) key1 + 96,
100  (const char *) key2 + 96, key_len);
101 }
102 
103 static int
104 rte_hash_k128_cmp_eq(const void *key1, const void *key2, size_t key_len)
105 {
106  return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
107  rte_hash_k64_cmp_eq((const char *) key1 + 64,
108  (const char *) key2 + 64, key_len);
109 }