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Optimise to_ascii_{upper,lower}case_smolstr

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This commit is contained in:
Alex Butler 2025-09-14 00:36:31 +01:00 committed by Lukas Wirth
parent 4cdc1b1544
commit a267e0905e
1 changed files with 26 additions and 2 deletions
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28
lib/smol_str/src/lib.rs
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@ -644,12 +644,36 @@ impl StrExt for str {
#[inline]
fn to_ascii_lowercase_smolstr(&self) -> SmolStr {
from_char_iter(self.chars().map(|c| c.to_ascii_lowercase()))
let len = self.len();
if len <= INLINE_CAP {
let mut buf = [0u8; INLINE_CAP];
buf[..len].copy_from_slice(self.as_bytes());
buf[..len].make_ascii_lowercase();
SmolStr(Repr::Inline {
// SAFETY: `len` is in bounds
len: unsafe { InlineSize::transmute_from_u8(len as u8) },
buf,
})
} else {
self.to_ascii_lowercase().into()
}
}
#[inline]
fn to_ascii_uppercase_smolstr(&self) -> SmolStr {
from_char_iter(self.chars().map(|c| c.to_ascii_uppercase()))
let len = self.len();
if len <= INLINE_CAP {
let mut buf = [0u8; INLINE_CAP];
buf[..len].copy_from_slice(self.as_bytes());
buf[..len].make_ascii_uppercase();
SmolStr(Repr::Inline {
// SAFETY: `len` is in bounds
len: unsafe { InlineSize::transmute_from_u8(len as u8) },
buf,
})
} else {
self.to_ascii_uppercase().into()
}
}
#[inline]