tclin914 wrote:
> Not related to this PR, but I'd like to raise the question here:
>
> For configurable cores, what is the best way to specify the features? `-mcpu`
> is meant to support the base configuration, but how can we specify the
> additional optional extensions? Apparently, failing back to `-march` is silly.
>
> My thought is: can we support `-march/-mcpu` where the values can be
> `{cpu}(_ext)*`? Will such use be problematic?
Unfortunately, we have to suggest our users to specify both `-march` and
`-mcpu` when their processor includes additional optional extensions. Ideally,
we hope that code generated using `-mcpu` alone would always be compatible with
processors that have varying configurations.
https://github.com/llvm/llvm-project/pull/144022
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