tree 7073eb90ca95161c9d503f7567bcfbe1cfe4f8ce
parent c0e0a38101e750737e431b894167a8202ca8f46c
parent 27b6c9174d15872ec708d278ec98bcd9eb8fe0ef
author bors <bors@rust-lang.org> 1508485818 +0000
committer bors <bors@rust-lang.org> 1508485818 +0000

Auto merge of #45319 - michaelwoerister:use-128bit-siphash, r=nikomatsakis

incr.comp.: Use 128bit SipHash for fingerprinting

This PR switches incr. comp. result fingerprinting from 128 bit BLAKE2 to 128 bit SipHash. When we started using BLAKE2 for fingerprinting, the 128 bit version of SipHash was still experimental. Now that it isn't anymore we should be able to get a nice performance boost without significantly increasing collision probability.

~~I'm going to start a try-build for this, so we can gauge the performance impact before merging (hence the `WIP` in the title).~~

EDIT: Performance improvements look as expected. Tests seem to be passing.

Fixes #41215.