/* * 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__ #include <vppinfra/clib.h> #if __SSE4_2__ #define clib_crc32c_uses_intrinsics #include <x86intrin.h> #define crc32_u64 _mm_crc32_u64 #define crc32_u32 _mm_crc32_u32 static_always_inline u32 clib_crc32c (u8 * s, int len) { u32 v = 0; #if defined(__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 */ #if !defined (__i686__) asm volatile ("":::"memory"); #endif #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_uses_intrinsics #include <arm_acle.h> #define crc32_u64 __crc32cd #define crc32_u32 __crc32cw 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: */