[PATCH] D155824: [LoongArch] Support -march=native and -mtune=

Thu Jul 20 19:20:32 PDT 2023

xry111 added a comment.

In D155824#4521047 <https://reviews.llvm.org/D155824#4521047>, @SixWeining wrote:

> In D155824#4518597 <https://reviews.llvm.org/D155824#4518597>, @xry111 wrote:
>
>> Do we need to convert Xuerui's label alignment change to use the -mtune framework?
>
> How to set the numbers if `TuneCPU` is empty? If there is no differences among `empty`, `loongarch64` and `la464`, seems it's better to do this until we support other uarchs, e.g. `la[236]64`.
>
> Just like the `TODO` in D148622 <https://reviews.llvm.org/D148622>:
>
>   63   // TODO: Check TuneCPU and override defaults (that are for LA464) once we
>   64   // support optimizing for more uarchs.

In GCC I added the numbers for "loongarch64" and "la464" although they are the same, and GCC does not have "empty".  But yes we can do things later here.

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https://reviews.llvm.org/D155824