Pelle Evensen's moremur 64 bit mix function.

Synopsis

Declared in <folly/hash/Hash.h>

constexpr
uint64_t
moremur_mix64(uint64_t key) noexcept;

Description

A bijection over the 64‐bit integers with strong avalanche: it passes the full RRC/PractRand mixer test battery, at lower cost, two multiplies and three xorshifts on a shorter dependency chain. Usable as a drop‐in finalizer for 64‐bit keys; see moremur_unmix64 for the inverse.

https://mostlymangling.blogspot.com/2019/12/stronger‐better‐morer‐moremur‐better.html

methodset moremur

Return Value

The mixed 64‐bit value

Parameters

Name

Description

key

The 64‐bit value to mix

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