Optimize empty case in Vec::retain · model-checking/verify-rust-std@5d51099 (original) (raw)

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Commit 5d51099

Optimize empty case in Vec::retain

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Original file line number	Diff line number	Diff line change
@@ -1711,6 +1711,12 @@ impl<T, A: Allocator> Vec<T, A> {
1711	1711	F: FnMut(&mut T) -> bool,
1712	1712	{
1713	1713	let original_len = self.len();
	1714	+
	1715	+if original_len == 0 {
	1716	+// Empty case: explicit return allows better optimization, vs letting compiler infer it
	1717	+return;
	1718	+}
	1719	+
1714	1720	// Avoid double drop if the drop guard is not executed,
1715	1721	// since we may make some holes during the process.
1716	1722	unsafe { self.set_len(0) };