topperc wrote:
> 2 only happens when users use __attribute__((target("xxxx"))), but user
> cannot use a xxxx if it doesn't exist at all. As long as we define a new
> fastcc implementation together when defining the new feature, there won't be
> a problem.
It can also happen in LTO if different modules being linked together used
different cpu or features on their command lines.
https://github.com/llvm/llvm-project/pull/164768
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