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C++ Protoc Projects
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Project mention: I wasted weeks hand optimizing assembly because I benchmarked on random data | news.ycombinator.com | 2025-07-24
(((uint32_t)clz + 7) * 9) >> 6
3. Hand roll a jump table taking advantage of arm's fixed instruction width to calculate the jump target with a shift.
https://github.com/protocolbuffers/protobuf/commit/b039dfe26...
This results in one branch for 1 byte varints, plus one additional branch for any larger size, and the branch predictor does not have to track a varying trip count through a loop. This approach resulted in a 2.64% speedup for overall encoding (which includes a lot more than just varints) on mid sized arm cores.
I think it's very difficult to beat a single comparison and branch for the 1 byte case for actual encoding forwards or backwards, unless you know there's going to be long runs of one-byte values.
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Index
| # | Project | Stars |
|---|---|---|
| 1 | Protobuf | 68,919 |
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