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-rw-r--r--src/vppinfra/crc32.h58
1 files changed, 58 insertions, 0 deletions
diff --git a/src/vppinfra/crc32.h b/src/vppinfra/crc32.h
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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__
+#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;
+}
+
+#endif
+
+#endif /* __included_crc32_h__ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */