Arm64 SVE: Implement missing extract methods #115336

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3. a74nh

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   arm-sveWork related to arm64 SVE/SVE2 supportWork related to arm64 SVE/SVE2 support

   area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMICLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI

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4. dotnet-policy-service commented on May 6, 2025

   

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5. a74nh commented on May 16, 2025

   

   a74nh

   on May 16, 2025

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   These APIs return either a scalar or a scalar in a Neon register. Therefore, it doesn't make sense that the mask has been hidden away for these, as they cannot be embedded inside a conditional select.

   The APIs should be:

   public static unsafe T ExtractAfterLastScalar(Vector<T> mask, Vector<T> value); // LASTA // predicated
   public static unsafe Vector<T> ExtractAfterLastVector(Vector<T> mask, Vector<T> value); // LASTA // predicated
   public static unsafe T ExtractLastScalar(Vector<T> mask, Vector<T> value); // LASTB // predicated
   public static unsafe Vector<T> ExtractLastVector(Vector<T> mask, Vector<T> value); // LASTB // predicated
   

   Note that the ConditionalExtract methods (CLASTA,CLASTB) do have the mask in the API.

   We plan to implement these with the mask, and then raise an API review issue to cover the differences.
6. jonathandavies-arm

   added 2 commits that reference this issue on May 29, 2025

   arm64: Implement missing SVE extract methods

   ...

   This issue will close once commit 6efadac is merged into the 'main' branch.

   6efadac

   arm64: Implement missing SVE extract methods

   ...

   This issue will close once commit 18e091e is merged into the 'main' branch.

   18e091e
7. kunalspathak

   added this to the 10.0.0 milestone on May 30, 2025
8. kunalspathak

   assigned

   jonathandavies-arm

   on May 30, 2025
9. kunalspathak

   closed this as completedin #116095on Jun 6, 2025
10. NaughtyCode

    added a commit that references this issue on Jun 6, 2025

    arm64: Implement missing SVE extract methods (dotnet#116095)

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    This issue will close once commit 7889937 is merged into the 'main' branch.

    7889937
11. github-actions

    locked and limited conversation to collaborators on Jul 7, 2025