etseidl commented on PR #8757:
URL: https://github.com/apache/arrow-rs/pull/8757#issuecomment-3474131237
FWIW I tried using
```
// byte N
let byte = self.read_byte()?;
if byte & 0x80 == 0 {
return Ok(in_progress | ((byte as u64) << N*7));
}
in_progress |= ((byte & 0x7f) as u64) << N*7;
```
as the unit of work and that worked a bit better on my laptop. No need to
mask `byte` if we already know the MSB is 0.
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