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C++ protobuf-runtime 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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The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
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C++ protobuf-runtime discussion
C++ protobuf-runtime related posts
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The provenance memory model for C
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The Big TDD Misunderstanding (2022)
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Μpb: Small, Fast C Protobufs
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Understanding Protocol Buffers: A Fast Alternative to JSON
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Part 3: Compiling the Protos and Setting up the gRPC server
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A protoc compiler plugin that generates useful extension code for Kotlin/JVM
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Show HN: Protobuf Editions now available in v27.0
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A note from our sponsor - JetBrains
surveys.jetbrains.com | 1 Sep 2025
Index
| # | Project | Stars |
|---|---|---|
| 1 | Protobuf | 68,919 |
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