XiangpengHao commented on issue #6034:
URL: https://github.com/apache/arrow-rs/issues/6034#issuecomment-2248279815
> If branch prediction works well, same function would be called again and
again.
Did you observe the branch prediction suffers on string with varying
lengths? That's very interesting! Would love to look at the benchmark code!
I think the rust implementation only has one conditional branch, i.e., `len
> 12`. If len is smaller than 12, it calcuates the offset and unconditionaly
jump to the corresponding offset, which should not cause pressure on the branch
predictor.
> with help of compiler assume
That's a very cool idea! That would lead to cleaner and more efficient code.
But it seems that Rust don't suppor them yet.
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