This is a rework of my previous patches improving performance of rte_hash_crc. In addition, this revision brings a fallback mechanism to ensure that CRC32 hash is calculated regardless of hardware support from CPU (i.e. SSE4.2 intrinsics).
Summary of changes: * added CRC32 software implementation, which is used as a fallback in case SSE4.2 is not available, or if SSE4.2 is intentionally disabled. * added rte_hash_crc_set_alg() function to control availability of SSE4.2. * added rte_hash_crc_8byte() function to calculate CRC32 on 8-byte operand. * reworked rte_hash_crc() function which leverages both versions of CRC32 hash calculation functions with 4 and 8-byte operands. Patches were tested on machines either with and without SSE4.2 support. Software implementation seems to be about 15 times slower than SSE4.2-enabled one. Of course, they return identical results. Yerden Zhumabekov (4): hash: add software CRC32 implementation hash: add new rte_hash_crc_8byte call hash: add fallback to software CRC32 implementation hash: rte_hash_crc() slices data into 8-byte pieces lib/librte_hash/rte_hash_crc.h | 212 ++++++++++++++++++++++++++++++++++++++-- 1 file changed, 202 insertions(+), 10 deletions(-) -- 1.7.9.5
