NeedsInvestigationPerformanceSuggestedhelp wanted
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描述
The discussion at https://github.com/golang/go/issues/31586 includes several techniques for optimizing xor of byte slices, including using encoding/binary (with native endianness) and loop unrolling. It'd be nice to apply them to safeXORBytes, which is used on many non-amd64 platforms. An optimized safeXORBytes might even be fast enough that we could delete fastXORBytes.
Somewhat related: #30553
cc @nhooyr