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The SSE4.2 string-comparison instructions on x86 are slow compared to alternatives.

Drawn from what Daniel Lemire said

Subjectsoftware performance
What this subject means

software performance Speed as a mark of quality: bloat, boot times, and software that got slower on hardware that got faster.

What Daniel Lemire actually said

  1. Daniel Lemire Computer science professor who works on fast data processing
    NEON has nothing like it; on x64, the closest thing is the SSE4.2 string-comparison instructions (pcmpistrm), which are slow.

    ↗Faster JSON parsing with SVE2 on ARM processorslemire.me

    18 Sept 2026

Added to korrents 20 Sept 2026 · How quotes work · Something wrong? Tell us

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