[PATCH] D115921: [RISCV] Refactor the RISCV ISA extension info and target features to support multiple extension version

[Zixuan Wu via Phabricator via cfe-commits]

zixuan-wu added a comment.

In D115921#3201346 <https://reviews.llvm.org/D115921#3201346>, @luismarques wrote:

>> enable 'm' extension with passing mattr=+m After this patch, it would be -mattr=+m2p0.
>
> It's not obvious to me that support for extension versions should mean or has to mean that we always explicitly specify the version. Why can't we keep supporting the option `mattr=+m`, which would be mapped to `mattr=+m,+m2p0`, or whatever the current default `m` version happens to be?

OK. I think default version mattr is acceptable. And then testcases change would be clean and simple.


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https://reviews.llvm.org/D115921