Branch: refs/heads/blead
Home: https://github.com/Perl/perl5
Commit: 1a871ce3a5385cd30b841c5e8e0413418e2bbe4b
https://github.com/Perl/perl5/commit/1a871ce3a5385cd30b841c5e8e0413418e2bbe4b
Author: Richard Leach <[email protected]>
Date: 2025-10-20 (Mon, 20 Oct 2025)
Changed paths:
M regexec.c
Log Message:
-----------
AHOCORASICK - Reduce heap allocation overhead
A `U8*` structure is used to track character positions during Aho-Corasick
string searching. This used to always be allocated from the heap, and
wrapped in a mortal SV to avoid leakage. However, that incurs overhead.
Following this commit:
* A stack buffer is used if `maxlen` is small enough.
* Otherwise, the heap allocation is saved directly to the savestack
for freeing during stack unwinding.
* Since a mortal SV is no longer used, there is no need to `SAVETMPS`
and `FREETMPS` at scope entry/exit.
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