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perf: improve write_fmt to handle simple strings #121001

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Mar 5, 2024
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6 changes: 6 additions & 0 deletions library/core/src/fmt/mod.rs
Original file line number Diff line number Diff line change
@@ -1102,8 +1102,14 @@ pub trait UpperExp {
/// ```
///
/// [`write!`]: crate::write!
#[inline]
#[stable(feature = "rust1", since = "1.0.0")]
pub fn write(output: &mut dyn Write, args: Arguments<'_>) -> Result {
if let Some(s) = args.as_str() { output.write_str(s) } else { write_internal(output, args) }
}

/// Actual implementation of the [`write()`], but without the simple string optimization.
fn write_internal(output: &mut dyn Write, args: Arguments<'_>) -> Result {
let mut formatter = Formatter::new(output);
let mut idx = 0;