bors 5171cc76c2 Auto merge of #77476 - tgnottingham:buffered_siphasher128, r=nnethercote ... perf: buffer SipHasher128 This is an attempt to improve Siphasher128 performance by buffering input. Although it reduces instruction count, I'm not confident the effect on wall times, or lack-thereof, is worth the change. --- Additional notes not reflected in source comments: * Implementation choices were guided by a combination of results from rustc-perf and micro-benchmarks, mostly the former. * ~~I tried a couple of different struct layouts that might be more cache friendly with no obvious effect.~~ Update: a particular struct layout was chosen, but it's not critical to performance. See comments in source and discussion below. * I suspect that buffering would be important to a SIMD-accelerated algorithm, but from what I've read and my own tests, SipHash does not seem very amenable to SIMD acceleration, at least by SSE.		2020-10-25 09:23:45 +00:00
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src	Auto merge of #77476 - tgnottingham:buffered_siphasher128, r=nnethercote	2020-10-25 09:23:45 +00:00
Cargo.toml	Upgrade to measureme 9.0.0	2020-10-24 22:39:42 -04:00