[PATCH] D119435: [Support][AArch64] Detect a few more host CPU features on AArch64

Tue Feb 22 07:01:57 PST 2022

danilaml added a comment.

In D119435#3316830 <https://reviews.llvm.org/D119435#3316830>, @tschuett wrote:

> This file describes the ABI for exporting the AArch64 CPU ID/feature registers to userspace. The availability of this ABI is advertised via the HWCAP_CPUID in HWCAPs.
>
> and
>
> https://github.com/rust-lang/rust/blob/master/src/tools/rustfmt/tests/source/cfg_if/detect/os/aarch64.rs
>
> So it should be possible from user space.
>
> https://reviews.llvm.org/D92619

Good, this means there could be some less OS-specific way to get the features, similarly to x86, however it appears to not be guaranteed, so cpuinfo fallback will still need to exist.

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  https://reviews.llvm.org/D119435/new/

https://reviews.llvm.org/D119435