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

[Lu Weining via Phabricator via llvm-commits]

SixWeining added a comment.

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.


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https://reviews.llvm.org/D155824