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/*
* Copyright (c) 2015 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __included_crc32_h__
#define __included_crc32_h__
#if __SSE4_2__
#define clib_crc32c_uses_intrinsics
#include <x86intrin.h>
static_always_inline u32
clib_crc32c (u8 * s, int len)
{
u32 v = 0;
#if __x86_64__
for (; len >= 8; len -= 8, s += 8)
v = _mm_crc32_u64 (v, *((u64 *) s));
#else
/* workaround weird GCC bug when using _mm_crc32_u32
which happens with -O2 optimization */
volatile ("":::"memory");
#endif
for (; len >= 4; len -= 4, s += 4)
v = _mm_crc32_u32 (v, *((u32 *) s));
for (; len >= 2; len -= 2, s += 2)
v = _mm_crc32_u16 (v, *((u16 *) s));
for (; len >= 1; len -= 1, s += 1)
v = _mm_crc32_u8 (v, *((u16 *) s));
return v;
}
#elif __ARM_FEATURE_CRC32
#define clib_crc32c_with_intrinsics
#include <arm_acle.h>
static_always_inline u32
clib_crc32c (u8 * s, int len)
{
u32 v = 0;
for (; len >= 8; len -= 8, s += 8)
v = __crc32cd (v, *((u64 *) s));
for (; len >= 4; len -= 4, s += 4)
v = __crc32cw (v, *((u32 *) s));
for (; len >= 2; len -= 2, s += 2)
v = __crc32ch (v, *((u16 *) s));
for (; len >= 1; len -= 1, s += 1)
v = __crc32cb (v, *((u8 *) s));
return v;
}
#endif
#endif /* __included_crc32_h__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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