[dpdk-dev] [PATCH v2 2/4] hash: add new rte_hash_crc_8byte call

Yerden Zhumabekov e_zhumabekov at sts.kz
Sun Nov 16 18:59:18 CET 2014


SSE4.2 provides _mm_crc32_u64 intrinsic with 8-byte operand.

Signed-off-by: Yerden Zhumabekov <e_zhumabekov at sts.kz>
---
 lib/librte_hash/rte_hash_crc.h |   16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/lib/librte_hash/rte_hash_crc.h b/lib/librte_hash/rte_hash_crc.h
index 3c368c5..74e2d92 100644
--- a/lib/librte_hash/rte_hash_crc.h
+++ b/lib/librte_hash/rte_hash_crc.h
@@ -169,6 +169,22 @@ rte_hash_crc_4byte(uint32_t data, uint32_t init_val)
 }
 
 /**
+ * Use single crc32 instruction to perform a hash on a 8 byte value.
+ *
+ * @param data
+ *   Data to perform hash on.
+ * @param init_val
+ *   Value to initialise hash generator.
+ * @return
+ *   32bit calculated hash value.
+ */
+static inline uint32_t
+rte_hash_crc_8byte(uint64_t data, uint32_t init_val)
+{
+	return _mm_crc32_u64(init_val, data);
+}
+
+/**
  * Use crc32 instruction to perform a hash.
  *
  * @param data
-- 
1.7.9.5



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