1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2014 Intel Corporation
5 #ifndef __INCLUDE_RTE_LRU_X86_H__
6 #define __INCLUDE_RTE_LRU_X86_H__
14 #include <rte_config.h>
16 #ifndef RTE_TABLE_HASH_LRU_STRATEGY
17 #define RTE_TABLE_HASH_LRU_STRATEGY 2
20 #if RTE_TABLE_HASH_LRU_STRATEGY == 2
22 #if RTE_CC_IS_GNU && (GCC_VERSION > 40306)
23 #include <x86intrin.h>
25 #include <emmintrin.h>
26 #include <smmintrin.h>
27 #include <xmmintrin.h>
30 #define lru_init(bucket) \
31 { bucket->lru_list = 0x0000000100020003LLU; }
33 #define lru_pos(bucket) (bucket->lru_list & 0xFFFFLLU)
35 #define lru_update(bucket, mru_val) \
37 /* set up the masks for all possible shuffles, depends on pos */\
38 static uint64_t masks[10] = { \
39 /* Shuffle order; Make Zero (see _mm_shuffle_epi8 manual) */\
40 0x0100070605040302, 0x8080808080808080, \
41 0x0302070605040100, 0x8080808080808080, \
42 0x0504070603020100, 0x8080808080808080, \
43 0x0706050403020100, 0x8080808080808080, \
44 0x0706050403020100, 0x8080808080808080}; \
45 /* load up one register with repeats of mru-val */ \
46 uint64_t mru2 = mru_val; \
47 uint64_t mru3 = mru2 | (mru2 << 16); \
48 uint64_t lru = bucket->lru_list; \
49 /* XOR to cause the word we're looking for to go to zero */ \
50 uint64_t mru = lru ^ ((mru3 << 32) | mru3); \
51 __m128i c = _mm_cvtsi64_si128(mru); \
52 __m128i b = _mm_cvtsi64_si128(lru); \
53 /* Find the minimum value (first zero word, if it's in there) */\
54 __m128i d = _mm_minpos_epu16(c); \
55 /* Second word is the index to found word (first word is the value) */\
56 unsigned int pos = _mm_extract_epi16(d, 1); \
57 /* move the recently used location to top of list */ \
58 __m128i k = _mm_shuffle_epi8(b, *((__m128i *) &masks[2 * pos]));\
59 /* Finally, update the original list with the reordered data */ \
60 bucket->lru_list = _mm_extract_epi64(k, 0); \
64 #elif RTE_TABLE_HASH_LRU_STRATEGY == 3
66 #if RTE_CC_IS_GNU && (GCC_VERSION > 40306)
67 #include <x86intrin.h>
69 #include <emmintrin.h>
70 #include <smmintrin.h>
71 #include <xmmintrin.h>
74 #define lru_init(bucket) \
75 { bucket->lru_list = ~0LLU; }
78 f_lru_pos(uint64_t lru_list)
80 __m128i lst = _mm_set_epi64x((uint64_t)-1, lru_list);
81 __m128i min = _mm_minpos_epu16(lst);
82 return _mm_extract_epi16(min, 1);
84 #define lru_pos(bucket) f_lru_pos(bucket->lru_list)
86 #define lru_update(bucket, mru_val) \
88 const uint64_t orvals[] = {0xFFFFLLU, 0xFFFFLLU << 16, \
89 0xFFFFLLU << 32, 0xFFFFLLU << 48, 0LLU}; \
90 const uint64_t decs[] = {0x1000100010001LLU, 0}; \
91 __m128i lru = _mm_cvtsi64_si128(bucket->lru_list); \
92 __m128i vdec = _mm_cvtsi64_si128(decs[mru_val>>2]); \
93 lru = _mm_subs_epu16(lru, vdec); \
94 bucket->lru_list = _mm_extract_epi64(lru, 0) | orvals[mru_val]; \