[vim/vim] Optimize repeat() string copying (PR #19977)

mattn

unread,

Apr 14, 2026, 12:30:43 PMApr 14

to vim/vim, Subscribed

This changes string handling in repeat() to copy the initial chunk once and then grow the result by copying from the already-built output buffer. That reduces the number of memmove() calls for larger repeat counts while preserving behavior.

Case	Before	After	Change
`repeat('ab', 64)`	0.1939 s	0.1866 s	1.04x faster

You can view, comment on, or merge this pull request online at:

https://github.com/vim/vim/pull/19977

Commit Summary

bc31dcf Optimize repeat() string copying

File Changes

(1 file)

M src/evalfunc.c (15)

Patch Links:

—
Reply to this email directly, view it on GitHub.
You are receiving this because you are subscribed to this thread.

Christian Brabandt

unread,

Apr 15, 2026, 12:21:27 PMApr 15

to vim/vim, Subscribed

chrisbra left a comment (vim/vim#19977)

thanks

—
Reply to this email directly, view it on GitHub, or unsubscribe.
You are receiving this because you are subscribed to this thread.

Christian Brabandt

unread,

Apr 15, 2026, 12:40:09 PMApr 15

to vim/vim, Subscribed

Closed #19977 via bfa46a5.

—
Reply to this email directly, view it on GitHub, or unsubscribe.
You are receiving this because you are subscribed to this thread.

Reply all

Reply to author

Forward