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Add a check for ASCII characters in to_upper and to_lower

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This extra check has better performance. See discussion here:
https://internals.rust-lang.org/t/to-upper-speed/13896
This commit is contained in:
Miccah Castorina 2021-01-24 16:03:38 -06:00
parent cecdb181ad
commit e48c68479e
1 changed files with 14 additions and 6 deletions
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20
library/core/src/unicode/unicode_data.rs
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@ -549,16 +549,24 @@ pub mod white_space {
#[rustfmt::skip]
pub mod conversions {
pub fn to_lower(c: char) -> [char; 3] {
match bsearch_case_table(c, LOWERCASE_TABLE) {
None => [c, '\0', '\0'],
Some(index) => LOWERCASE_TABLE[index].1,
if c.is_ascii() {
[(c as u8).to_ascii_lowercase() as char, '\0', '\0']
} else {
match bsearch_case_table(c, LOWERCASE_TABLE) {
None => [c, '\0', '\0'],
Some(index) => LOWERCASE_TABLE[index].1,
}
}
}
pub fn to_upper(c: char) -> [char; 3] {
match bsearch_case_table(c, UPPERCASE_TABLE) {
None => [c, '\0', '\0'],
Some(index) => UPPERCASE_TABLE[index].1,
if c.is_ascii() {
[(c as u8).to_ascii_uppercase() as char, '\0', '\0']
} else {
match bsearch_case_table(c, UPPERCASE_TABLE) {
None => [c, '\0', '\0'],
Some(index) => UPPERCASE_TABLE[index].1,
}
}
}