DPDK  17.11.10
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  const __m128i x = _mm_xor_si128(k1, k2);
41 
42  return !_mm_test_all_zeros(x, x);
43 }
44 
45 static int
46 rte_hash_k32_cmp_eq(const void *key1, const void *key2, size_t key_len)
47 {
48  return rte_hash_k16_cmp_eq(key1, key2, key_len) ||
49  rte_hash_k16_cmp_eq((const char *) key1 + 16,
50  (const char *) key2 + 16, key_len);
51 }
52 
53 static int
54 rte_hash_k48_cmp_eq(const void *key1, const void *key2, size_t key_len)
55 {
56  return rte_hash_k16_cmp_eq(key1, key2, key_len) ||
57  rte_hash_k16_cmp_eq((const char *) key1 + 16,
58  (const char *) key2 + 16, key_len) ||
59  rte_hash_k16_cmp_eq((const char *) key1 + 32,
60  (const char *) key2 + 32, key_len);
61 }
62 
63 static int
64 rte_hash_k64_cmp_eq(const void *key1, const void *key2, size_t key_len)
65 {
66  return rte_hash_k32_cmp_eq(key1, key2, key_len) ||
67  rte_hash_k32_cmp_eq((const char *) key1 + 32,
68  (const char *) key2 + 32, key_len);
69 }
70 
71 static int
72 rte_hash_k80_cmp_eq(const void *key1, const void *key2, size_t key_len)
73 {
74  return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
75  rte_hash_k16_cmp_eq((const char *) key1 + 64,
76  (const char *) key2 + 64, key_len);
77 }
78 
79 static int
80 rte_hash_k96_cmp_eq(const void *key1, const void *key2, size_t key_len)
81 {
82  return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
83  rte_hash_k32_cmp_eq((const char *) key1 + 64,
84  (const char *) key2 + 64, key_len);
85 }
86 
87 static int
88 rte_hash_k112_cmp_eq(const void *key1, const void *key2, size_t key_len)
89 {
90  return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
91  rte_hash_k32_cmp_eq((const char *) key1 + 64,
92  (const char *) key2 + 64, key_len) ||
93  rte_hash_k16_cmp_eq((const char *) key1 + 96,
94  (const char *) key2 + 96, key_len);
95 }
96 
97 static int
98 rte_hash_k128_cmp_eq(const void *key1, const void *key2, size_t key_len)
99 {
100  return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
101  rte_hash_k64_cmp_eq((const char *) key1 + 64,
102  (const char *) key2 + 64, key_len);
103 }
#define __rte_unused
Definition: rte_common.h:105