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Use .extend(..) instead of push()-ing in loop

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A bit less readable but more compact, and maybe faster? We'll see.
This commit is contained in:
Martin Gammelsæter 2022-04-13 08:44:20 +02:00
parent 2b14529a7c
commit 5f2c6b92d1
1 changed files with 12 additions and 18 deletions
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30
compiler/rustc_span/src/lib.rs
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@ -1319,24 +1319,18 @@ impl<D: Decoder> Decodable<D> for SourceFile {
lines.push(line_start);
match bytes_per_diff {
1 => {
for _ in 1..num_lines {
line_start = line_start + BytePos(d.read_u8() as u32);
lines.push(line_start);
}
}
2 => {
for _ in 1..num_lines {
line_start = line_start + BytePos(d.read_u16() as u32);
lines.push(line_start);
}
}
4 => {
for _ in 1..num_lines {
line_start = line_start + BytePos(d.read_u32());
lines.push(line_start);
}
}
1 => lines.extend((1..num_lines).map(|_| {
line_start = line_start + BytePos(d.read_u8() as u32);
line_start
})),
2 => lines.extend((1..num_lines).map(|_| {
line_start = line_start + BytePos(d.read_u16() as u32);
line_start
})),
4 => lines.extend((1..num_lines).map(|_| {
line_start = line_start + BytePos(d.read_u32());
line_start
})),
_ => unreachable!(),
}
}