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string/aarch64: optimizing SVE routines #65

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string/aarch64: optimizing SVE routines #65

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Commits on Jan 24, 2024

  1. string/aarch64: optimizing SVE routines 

    Optimized the following SVE string routines: `memcmp`, `strchr`, `strcmp`, `strcpy`, `strlen`, `strncmp`, `strnlen`, `strrchr`.

On Arm Neoverse V1 microarchitectures, `INCx` instructions used to increment the loop offset can cause significant slowdowns. One solution is to hoist the retrieval of the SVE register width out of the loop using `CNTx` in the loop prelude and replace the `INCx` with a simple `ADD`.
This change should not incur any performance penalty on other SVE-supporting microarchitectures (e.g., Neoverse V2, A64FX, etc...).
    @dssgabriel
    dssgabriel committed Jan 24, 2024
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