Re: Efficient HV fetches without recomputing the key hash

* Paul "LeoNerd" Evans <[email protected]> [2026-05-13 19:58]:
>   * Directly reach-around the `hv_fetch*` macros by observing that
>     they are all just wrappers around hv_common(), and make myself a
>     brand new wrapper, something like
>
>       #define hv_fetch_with_hash(hv, key, klen, lval, hash)    \
>         hv_common_key_len((hv), (key), (klen),                 \
>           (HV_FETCH_JUST_SV | ((lval) ? HV_FETCH_LVALUE : 0)), \
>           NULL, (hash))
>
>     That's a straight-up copy of hv_fetch, just passing in (hash)
>     rather than 0 for the hash value.
>
>     Downside: not guaranteed to continue to work in newer perls
>
>   * Add a new API function with this shape, and then call it.
>
>       SV **hv_fetch_with_hash(HV *hv, const char *key, I32 klen,
>           I32 lval, U32 hash);
>
>     Downside: doesn't work on older perls.

The nice thing about the past is that it’s not subject to change and
already known. A polyfill of a new function for old perls is a finite,
knowable, fixed amount of work.

The future is not as nice.

[yada Yada PPPort, as per everyone else]