Re: [PATCH 0/7] RFC: Accelerate xdiff and begin its rustification

[Junio C Hamano <gitster@pobox.com>]

Phillip Wood <phillip.wood123@gmail.com> writes:

> ... by 15%. Just over half of that seems to come from hoisting the
> check for whitespace flags in xdl_hash_record() out of the loop
> in xdl_prepare_ctx() and the rest comes from the change in hash
> function.

The first half of that alone is interesting enough ;-).

> As I understand it the hash is implemented using SIMD
> compiler intrinsics and the rust implementation is basically a
> copy of the C code in libxxhash. I wonder how well xxhash performs
> compared to our existing hash on platforms without an optimized
> implementation.

Yeah, that indeed is worth investigating.

Thanks.