DPDK  2.2.0
rte_cmp_arm64.h
1 /*-
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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,
37  size_t key_len __rte_unused)
38 {
39  uint64_t x0, x1, y0, y1;
40 
41  asm volatile(
42  "ldp %x[x1], %x[x0], [%x[p1]]"
43  : [x1]"=r"(x1), [x0]"=r"(x0)
44  : [p1]"r"(key1)
45  );
46  asm volatile(
47  "ldp %x[y1], %x[y0], [%x[p2]]"
48  : [y1]"=r"(y1), [y0]"=r"(y0)
49  : [p2]"r"(key2)
50  );
51  x0 ^= y0;
52  x1 ^= y1;
53  return !(x0 == 0 && x1 == 0);
54 }
55 
56 static int
57 rte_hash_k32_cmp_eq(const void *key1, const void *key2, size_t key_len)
58 {
59  return rte_hash_k16_cmp_eq(key1, key2, key_len) ||
60  rte_hash_k16_cmp_eq((const char *) key1 + 16,
61  (const char *) key2 + 16, key_len);
62 }
63 
64 static int
65 rte_hash_k48_cmp_eq(const void *key1, const void *key2, size_t key_len)
66 {
67  return rte_hash_k16_cmp_eq(key1, key2, key_len) ||
68  rte_hash_k16_cmp_eq((const char *) key1 + 16,
69  (const char *) key2 + 16, key_len) ||
70  rte_hash_k16_cmp_eq((const char *) key1 + 32,
71  (const char *) key2 + 32, key_len);
72 }
73 
74 static int
75 rte_hash_k64_cmp_eq(const void *key1, const void *key2, size_t key_len)
76 {
77  return rte_hash_k32_cmp_eq(key1, key2, key_len) ||
78  rte_hash_k32_cmp_eq((const char *) key1 + 32,
79  (const char *) key2 + 32, key_len);
80 }
81 
82 static int
83 rte_hash_k80_cmp_eq(const void *key1, const void *key2, size_t key_len)
84 {
85  return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
86  rte_hash_k16_cmp_eq((const char *) key1 + 64,
87  (const char *) key2 + 64, key_len);
88 }
89 
90 static int
91 rte_hash_k96_cmp_eq(const void *key1, const void *key2, size_t key_len)
92 {
93  return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
94  rte_hash_k32_cmp_eq((const char *) key1 + 64,
95  (const char *) key2 + 64, key_len);
96 }
97 
98 static int
99 rte_hash_k112_cmp_eq(const void *key1, const void *key2, size_t key_len)
100 {
101  return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
102  rte_hash_k32_cmp_eq((const char *) key1 + 64,
103  (const char *) key2 + 64, key_len) ||
104  rte_hash_k16_cmp_eq((const char *) key1 + 96,
105  (const char *) key2 + 96, key_len);
106 }
107 
108 static int
109 rte_hash_k128_cmp_eq(const void *key1, const void *key2, size_t key_len)
110 {
111  return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
112  rte_hash_k64_cmp_eq((const char *) key1 + 64,
113  (const char *) key2 + 64, key_len);
114 }
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