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authorJulian Andres Klode <jak@debian.org>2018-12-26 12:39:56 +0100
committerJulian Andres Klode <jak@debian.org>2018-12-26 21:22:37 +0100
commit37ae749b20485b6c8237d5b5a08cfdd58a2364e1 (patch)
tree00d125414addc539da8dedf1a415a4ca29182669 /apt-private
parent68362f7996f4e72d73b40d61dc821610a1a4a148 (diff)
cache hash: Use sse4.2 CRC32c on x86-64 where available
This is more than twice as fast as adler32, but could be made another 50% faster by calculating crcs for 8 byte blocks in "parallel" (without data dependency) and then combining them. But that's complicated code. Reference measurements for hashing the cache 100 times: adler32=2.46s xxhash64=0.64 xxhash32=1.12 crc32c(this)=1.10 crc32c(opt)=0.44s
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