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 #ifndef RTE_TABLE_HASH_LRU_STRATEGY
15 #define RTE_TABLE_HASH_LRU_STRATEGY 2
18 #if RTE_TABLE_HASH_LRU_STRATEGY == 2
20 #if defined(RTE_TOOLCHAIN_GCC) && (GCC_VERSION > 40306)
21 #include <x86intrin.h>
23 #include <emmintrin.h>
24 #include <smmintrin.h>
25 #include <xmmintrin.h>
28 #define lru_init(bucket) \
29 { bucket->lru_list = 0x0000000100020003LLU; }
31 #define lru_pos(bucket) (bucket->lru_list & 0xFFFFLLU)
33 #define lru_update(bucket, mru_val) \
35 /* set up the masks for all possible shuffles, depends on pos */\
36 static uint64_t masks[10] = { \
37 /* Shuffle order; Make Zero (see _mm_shuffle_epi8 manual) */\
38 0x0100070605040302, 0x8080808080808080, \
39 0x0302070605040100, 0x8080808080808080, \
40 0x0504070603020100, 0x8080808080808080, \
41 0x0706050403020100, 0x8080808080808080, \
42 0x0706050403020100, 0x8080808080808080}; \
43 /* load up one register with repeats of mru-val */ \
44 uint64_t mru2 = mru_val; \
45 uint64_t mru3 = mru2 | (mru2 << 16); \
46 uint64_t lru = bucket->lru_list; \
47 /* XOR to cause the word we're looking for to go to zero */ \
48 uint64_t mru = lru ^ ((mru3 << 32) | mru3); \
49 __m128i c = _mm_cvtsi64_si128(mru); \
50 __m128i b = _mm_cvtsi64_si128(lru); \
51 /* Find the minimum value (first zero word, if it's in there) */\
52 __m128i d = _mm_minpos_epu16(c); \
53 /* Second word is the index to found word (first word is the value) */\
54 unsigned int pos = _mm_extract_epi16(d, 1); \
55 /* move the recently used location to top of list */ \
56 __m128i k = _mm_shuffle_epi8(b, *((__m128i *) &masks[2 * pos]));\
57 /* Finally, update the original list with the reordered data */ \
58 bucket->lru_list = _mm_extract_epi64(k, 0); \
62 #elif RTE_TABLE_HASH_LRU_STRATEGY == 3
64 #if defined(RTE_TOOLCHAIN_GCC) && (GCC_VERSION > 40306)
65 #include <x86intrin.h>
67 #include <emmintrin.h>
68 #include <smmintrin.h>
69 #include <xmmintrin.h>
72 #define lru_init(bucket) \
73 { bucket->lru_list = ~0LLU; }
76 f_lru_pos(uint64_t lru_list)
78 __m128i lst = _mm_set_epi64x((uint64_t)-1, lru_list);
79 __m128i min = _mm_minpos_epu16(lst);
80 return _mm_extract_epi16(min, 1);
82 #define lru_pos(bucket) f_lru_pos(bucket->lru_list)
84 #define lru_update(bucket, mru_val) \
86 const uint64_t orvals[] = {0xFFFFLLU, 0xFFFFLLU << 16, \
87 0xFFFFLLU << 32, 0xFFFFLLU << 48, 0LLU}; \
88 const uint64_t decs[] = {0x1000100010001LLU, 0}; \
89 __m128i lru = _mm_cvtsi64_si128(bucket->lru_list); \
90 __m128i vdec = _mm_cvtsi64_si128(decs[mru_val>>2]); \
91 lru = _mm_subs_epu16(lru, vdec); \
92 bucket->lru_list = _mm_extract_epi64(lru, 0) | orvals[mru_val]; \