Literal keys in hash subscripts and hash slices have the the hash (as in checksum) values of their strings pre-computed, and the string part of the string constant is stored in such a way that its easy and quick to pass directly to the hash lookup API functions.

Technically: at compile time, the PV part of the const SV is converted to a HEK, with SvPV(sv) pointing to the string part within the HEK. So it looks like a string but is also a HEK.

Dave.

In reply to Re: Benchmark: Constant List in Hash Slice by dave_the_m
in thread Benchmark: Constant List in Hash Slice by LanX

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