chore: optimise UvarintSize #28
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Ref: protocolbuffers/protobuf-go@8e8926e
I got nerdsniped when I saw the above and figured we'd get some value out of it here too.
On my AMD Ryzen 9 I get these results:
GOAMD64=v1(default): 25.6% improvementGOAMD64=v2(default): 25.3% improvementGOAMD64=v3(default): 42.2% improvement (this is whereLZCNTcomes in)GOAMD64=v4(default): 43.1% improvement