← Tuesday, October 20, 2026Performance & OSBenchmark

A Swift IPv4 parser reaches about 3 ns on an Apple M6

blog.mahdibm.com 14 min read Editor score 8/10

The parser reports 75 instructions in 15 CPU cycles and roughly 3 ns on an M6, with benchmarks also covering AMD Zen 5. The measured implementation offers useful performance evidence for networking and parsing code.

What

- A Swift IPv4 parser targets about 3 ns on an Apple M6, with 75 instructions in 15 CPU cycles.

How

- The implementation is motivated by Swift inputs that can be 7–15 bytes, without requiring padding or a trailing null byte; it also targets performance without lookup tables.

Why it matters

- Avoiding lookup tables and C-style input assumptions can reduce cache and memory dependencies and make performance more predictable across CPUs.

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