2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #ifndef __included_crc32_h__
17 #define __included_crc32_h__
19 #include <vppinfra/clib.h>
22 #define clib_crc32c_uses_intrinsics
23 #include <x86intrin.h>
25 static_always_inline u32
26 clib_crc32c (u8 * s, int len)
31 for (; len >= 8; len -= 8, s += 8)
32 v = _mm_crc32_u64 (v, *((u64 *) s));
34 /* workaround weird GCC bug when using _mm_crc32_u32
35 which happens with -O2 optimization */
36 volatile ("":::"memory");
39 for (; len >= 4; len -= 4, s += 4)
40 v = _mm_crc32_u32 (v, *((u32 *) s));
42 for (; len >= 2; len -= 2, s += 2)
43 v = _mm_crc32_u16 (v, *((u16 *) s));
45 for (; len >= 1; len -= 1, s += 1)
46 v = _mm_crc32_u8 (v, *((u16 *) s));
51 #elif __ARM_FEATURE_CRC32
52 #define clib_crc32c_with_intrinsics
55 static_always_inline u32
56 clib_crc32c (u8 * s, int len)
60 for (; len >= 8; len -= 8, s += 8)
61 v = __crc32cd (v, *((u64 *) s));
63 for (; len >= 4; len -= 4, s += 4)
64 v = __crc32cw (v, *((u32 *) s));
66 for (; len >= 2; len -= 2, s += 2)
67 v = __crc32ch (v, *((u16 *) s));
69 for (; len >= 1; len -= 1, s += 1)
70 v = __crc32cb (v, *((u8 *) s));
76 #endif /* __included_crc32_h__ */
79 * fd.io coding-style-patch-verification: ON
82 * eval: (c-set-style "gnu")