YeonguChoe wrote:

> Why is this needed? It updates clang to use the `llvm.is.fpclass` intrinsic 
> rather than direct operations that deduce the same information, but is that 
> necessary?

Hello Andy

I may be wrong. But I think lowering C/C++ to intrinsic operation is better, 
because intrinsic operation is lowered to different machine IR depending on 
target during instruction selection phase.

https://github.com/llvm/llvm-project/pull/190848
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