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__
20 #include <x86intrin.h>
22 static_always_inline u32
23 clib_crc32c (u8 * s, int len)
28 for (; len >= 8; len -= 8, s += 8)
29 v = _mm_crc32_u64 (v, *((u64 *) s));
31 /* workaround weird GCC bug when using _mm_crc32_u32
32 which happens with -O2 optimization */
33 volatile ("":::"memory");
36 for (; len >= 4; len -= 4, s += 4)
37 v = _mm_crc32_u32 (v, *((u32 *) s));
39 for (; len >= 2; len -= 2, s += 2)
40 v = _mm_crc32_u16 (v, *((u16 *) s));
42 for (; len >= 1; len -= 1, s += 1)
43 v = _mm_crc32_u8 (v, *((u16 *) s));
50 #endif /* __included_crc32_h__ */
53 * fd.io coding-style-patch-verification: ON
56 * eval: (c-set-style "gnu")