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rust-lang / rustc-stable-hash

A stable hashing algorithm used by rustc: cross-platform, deterministic, not secure
Apache License 2.0
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Optimize SipHash by reordering instructions in compress #7

Closed mat-1 closed 3 months ago

mat-1 commented 3 months ago

This change optimizes the compress macro by changing the order of instructions so the CPU can parallelize it better. Part of https://github.com/rust-lang/rust/pull/127226, see that PR for more info.