net/mlx5: use SPDX tags in 6WIND copyrighted files
[dpdk.git] / lib / librte_table / rte_lru_arm64.h
1 /* SPDX-License-Identifier: BSD-3-Clause
2  * Copyright(c) 2017 Cavium, Inc
3  */
4
5 #ifndef __RTE_LRU_ARM64_H__
6 #define __RTE_LRU_ARM64_H__
7
8 #ifdef __cplusplus
9 extern "C" {
10 #endif
11
12 #include <stdint.h>
13 #include <rte_vect.h>
14
15 #ifndef RTE_TABLE_HASH_LRU_STRATEGY
16 #ifdef RTE_MACHINE_CPUFLAG_NEON
17 #define RTE_TABLE_HASH_LRU_STRATEGY                        3
18 #else /* if no NEON, use simple scalar version */
19 #define RTE_TABLE_HASH_LRU_STRATEGY                        1
20 #endif
21 #endif
22
23 #if RTE_TABLE_HASH_LRU_STRATEGY == 3
24
25 #define lru_init(bucket)                                                \
26         { bucket->lru_list = ~0LLU; }
27
28 static inline int
29 f_lru_pos(uint64_t lru_list)
30 {
31         /* Compare the vector to zero vector */
32         uint16x4_t lru_vec = vld1_u16((uint16_t *)&lru_list);
33         uint16x4_t min_vec = vmov_n_u16(vminv_u16(lru_vec));
34         uint64_t mask = vget_lane_u64(vreinterpret_u64_u16(
35                         vceq_u16(min_vec, lru_vec)), 0);
36         return __builtin_clzl(mask) >> 4;
37 }
38 #define lru_pos(bucket) f_lru_pos(bucket->lru_list)
39
40 #define lru_update(bucket, mru_val)                                     \
41 do {                                                                    \
42         const uint64_t orvals[] = {0xFFFFLLU, 0xFFFFLLU << 16,          \
43                 0xFFFFLLU << 32, 0xFFFFLLU << 48, 0LLU};                \
44         const uint64_t decs[] = {0x1000100010001LLU, 0};                \
45         uint64x1_t lru = vdup_n_u64(bucket->lru_list);                  \
46         uint64x1_t vdec = vdup_n_u64(decs[mru_val>>2]);                 \
47         bucket->lru_list = vget_lane_u64(vreinterpret_u64_u16(          \
48                                 vsub_u16(vreinterpret_u16_u64(lru),     \
49                                         vreinterpret_u16_u64(vdec))),   \
50                                 0);                                     \
51         bucket->lru_list |= orvals[mru_val];                            \
52 } while (0)
53
54 #endif
55
56 #ifdef __cplusplus
57 }
58 #endif
59
60 #endif