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2020-10-11SipHasher128: improve constant names and add more commentsTyson Nottingham-2/+2
2020-10-03perf: buffer SipHasher128Tyson Nottingham-0/+45
2020-09-30Stable hashing: add comments and tests concerning platform-independenceTyson Nottingham-11/+45
SipHasher128 implements short_write in an endian-independent way, yet its write_xxx Hasher trait methods undo this endian-independence by byte swapping the integer inputs on big-endian hardware. StableHasher then adds endian-independence back by also byte-swapping on big-endian hardware prior to invoking SipHasher128. This double swap may have the appearance of being a no-op, but is in fact by design. In particular, we really do want SipHasher128 to be platform-dependent, in order to be consistent with the libstd SipHasher. Try to clarify this intent. Also, add and update a couple of unit tests.
2020-08-30mv compiler to compiler/mark-0/+418