boomanaiden154 wrote:

> switch llc only when GIsel is supported.

I think this makes sense for the vast majority of targets.

> clang and other frontends would still plumb options through the driver (or is 
> it the plan to make this the master gating option ?)

Frontends that need a lot of control should query this flag. 
https://github.com/llvm/llvm-project/pull/214571

For frontends that don't need less control (i.e., don't need to set 
PassBuilderOptions), I'll probably end up implementing a common abstraction.

https://github.com/llvm/llvm-project/pull/214572
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