Branch: refs/heads/blead
Home: https://github.com/Perl/perl5
Commit: dbe37414ccd0f34ff1638f49deb9955648e98099
https://github.com/Perl/perl5/commit/dbe37414ccd0f34ff1638f49deb9955648e98099
Author: Richard Leach <richardle...@users.noreply.github.com>
Date: 2025-03-13 (Thu, 13 Mar 2025)
Changed paths:
M sv.c
Log Message:
-----------
Perl_vnewSVpvf - use the pattern length to size the new PV buffer
This function currently creates a new SVt_PV with a minimum string
length buffer via:
sv = newSV(1);
Simple measurements from compiling perl show that this is often sufficient.
When it isn't, the final buffer length is often close to strlen(pat).
Common cases that require a realloc() now will not with this commit. In
other cases, realloc()s will still be required, but the number will
likely be smaller by one.
Although min length & alloc behaviour can vary across platforms and
compilers, the following numbers are likely indicative:
|strlen(pat)|Inital SvLEN before|Initial SvLEN now|Final SvLEN|
|-----------|-------------------|-----------------|-----------|
|004|16|016|016|
|058|16|060|060|
|071|16|073|120|
|104|16|106|106|
|104|16|106|200|
|122|16|124|124|
|123|16|125|125|
|123|16|125|168|
|377|16|379|379|
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