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Implement vpmaxq_u8 on aarch64 #4193

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@bjorn3 bjorn3 commented Feb 14, 2025

This is documented in https://developer.arm.com/architectures/instruction-sets/intrinsics/#q=vpmaxq_u8

This makes all memchr tests suite pass when I remove #[cfg(not(miri))] from tests.

Fixes #4191

@RalfJung RalfJung added the S-waiting-on-author Status: Waiting for the PR author to address review comments label Feb 16, 2025
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bjorn3 commented Feb 21, 2025

Turns out the memchr test failures were because I was accidentally doing signed rather than unsigned comparisons. All tests are passing now.

@bjorn3 bjorn3 marked this pull request as ready for review February 21, 2025 11:22
@bjorn3 bjorn3 added S-waiting-on-review Status: Waiting for a review to complete and removed S-waiting-on-author Status: Waiting for the PR author to address review comments labels Feb 21, 2025
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Please add a test; you can use the x86 intrinsic tests as template. In particular there should be a Miri test directly checking the signed vs unsigned issue.

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@rustbot rustbot added S-waiting-on-author Status: Waiting for the PR author to address review comments and removed S-waiting-on-review Status: Waiting for a review to complete labels Feb 21, 2025
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bjorn3 commented Feb 21, 2025

Added tests.

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@rustbot rustbot added S-waiting-on-review Status: Waiting for a review to complete and removed S-waiting-on-author Status: Waiting for the PR author to address review comments labels Feb 21, 2025
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Support memchr on arm64 too
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