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AK: Add ASCII fast path for Utf8View::contains

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This also makes `Utf8View::trim` significantly faster, since most
strings start and end with ASCII.
This commit is contained in:
Jonne Ransijn 2024-10-27 14:03:16 +01:00 committed by Andreas Kling
parent b953b5cc71
commit 7f3269fb02
Notes: github-actions[bot] 2024-10-27 15:14:24 +00:00 
Author: https://github.com/yyny
Commit: https://github.com/LadybirdBrowser/ladybird/commit/7f3269fb025
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/1998
1 changed files with 12 additions and 3 deletions
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15
AK/Utf8View.cpp
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@ -104,10 +104,19 @@ bool Utf8View::starts_with(Utf8View const& start) const
bool Utf8View::contains(u32 needle) const
{
for (u32 code_point : *this) {
if (code_point == needle)
return true;
if (needle <= 0x7f) {
// OPTIMIZATION: Fast path for ASCII
for (u8 code_point : as_string()) {
if (code_point == needle)
return true;
}
} else {
for (u32 code_point : *this) {
if (code_point == needle)
return true;
}
}
return false;
}