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Remove one bounds check from BufReader #37696

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Merged
merged 1 commit into from
Nov 12, 2016
Merged

Remove one bounds check from BufReader #37696

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5 changes: 4 additions & 1 deletion src/libstd/io/buffered.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -187,7 +187,10 @@ impl<R: Read> BufRead for BufReader<R> {
fn fill_buf(&mut self) -> io::Result<&[u8]> {
// If we've reached the end of our internal buffer then we need to fetch
// some more data from the underlying reader.
if self.pos == self.cap {
// Branch using `>=` instead of the more correct `==`
// to tell the compiler that the pos..cap slice is always valid.
if self.pos >= self.cap {
debug_assert!(self.pos == self.cap);
self.cap = self.inner.read(&mut self.buf)?;
self.pos = 0;
}
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