DPDK 22.11.6
rte_crc_x86.h
1/* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2014 Intel Corporation
3 */
4
5#ifndef _RTE_CRC_X86_H_
6#define _RTE_CRC_X86_H_
7
8static inline uint32_t
9crc32c_sse42_u8(uint8_t data, uint32_t init_val)
10{
11 __asm__ volatile(
12 "crc32b %[data], %[init_val];"
13 : [init_val] "+r" (init_val)
14 : [data] "rm" (data));
15 return init_val;
16}
17
18static inline uint32_t
19crc32c_sse42_u16(uint16_t data, uint32_t init_val)
20{
21 __asm__ volatile(
22 "crc32w %[data], %[init_val];"
23 : [init_val] "+r" (init_val)
24 : [data] "rm" (data));
25 return init_val;
26}
27
28static inline uint32_t
29crc32c_sse42_u32(uint32_t data, uint32_t init_val)
30{
31 __asm__ volatile(
32 "crc32l %[data], %[init_val];"
33 : [init_val] "+r" (init_val)
34 : [data] "rm" (data));
35 return init_val;
36}
37
38static inline uint32_t
39crc32c_sse42_u64_mimic(uint64_t data, uint64_t init_val)
40{
41 union {
42 uint32_t u32[2];
43 uint64_t u64;
44 } d;
45
46 d.u64 = data;
47 init_val = crc32c_sse42_u32(d.u32[0], (uint32_t)init_val);
48 init_val = crc32c_sse42_u32(d.u32[1], (uint32_t)init_val);
49 return (uint32_t)init_val;
50}
51
52static inline uint32_t
53crc32c_sse42_u64(uint64_t data, uint64_t init_val)
54{
55 __asm__ volatile(
56 "crc32q %[data], %[init_val];"
57 : [init_val] "+r" (init_val)
58 : [data] "rm" (data));
59 return (uint32_t)init_val;
60}
61
62/*
63 * Use single crc32 instruction to perform a hash on a byte value.
64 * Fall back to software crc32 implementation in case SSE4.2 is
65 * not supported.
66 */
67static inline uint32_t
68rte_hash_crc_1byte(uint8_t data, uint32_t init_val)
69{
70 if (likely(crc32_alg & CRC32_SSE42))
71 return crc32c_sse42_u8(data, init_val);
72
73 return crc32c_1byte(data, init_val);
74}
75
76/*
77 * Use single crc32 instruction to perform a hash on a 2 bytes value.
78 * Fall back to software crc32 implementation in case SSE4.2 is
79 * not supported.
80 */
81static inline uint32_t
82rte_hash_crc_2byte(uint16_t data, uint32_t init_val)
83{
84 if (likely(crc32_alg & CRC32_SSE42))
85 return crc32c_sse42_u16(data, init_val);
86
87 return crc32c_2bytes(data, init_val);
88}
89
90/*
91 * Use single crc32 instruction to perform a hash on a 4 byte value.
92 * Fall back to software crc32 implementation in case SSE4.2 is
93 * not supported.
94 */
95static inline uint32_t
96rte_hash_crc_4byte(uint32_t data, uint32_t init_val)
97{
98 if (likely(crc32_alg & CRC32_SSE42))
99 return crc32c_sse42_u32(data, init_val);
100
101 return crc32c_1word(data, init_val);
102}
103
104/*
105 * Use single crc32 instruction to perform a hash on a 8 byte value.
106 * Fall back to software crc32 implementation in case SSE4.2 is
107 * not supported.
108 */
109static inline uint32_t
110rte_hash_crc_8byte(uint64_t data, uint32_t init_val)
111{
112#ifdef RTE_ARCH_X86_64
113 if (likely(crc32_alg == CRC32_SSE42_x64))
114 return crc32c_sse42_u64(data, init_val);
115#endif
116
117 if (likely(crc32_alg & CRC32_SSE42))
118 return crc32c_sse42_u64_mimic(data, init_val);
119
120 return crc32c_2words(data, init_val);
121}
122
123#endif /* _RTE_CRC_X86_H_ */
#define likely(x)
static uint32_t rte_hash_crc_4byte(uint32_t data, uint32_t init_val)
static uint32_t rte_hash_crc_1byte(uint8_t data, uint32_t init_val)
static uint32_t rte_hash_crc_2byte(uint16_t data, uint32_t init_val)
static uint32_t rte_hash_crc_8byte(uint64_t data, uint32_t init_val)