Sorry I was posting on a wrong thread 

@kparzysz Thanks for asking! For example, there might be some rare TVM 
intrinsics like `tir.erf` that may be lowered to some cuda intrinsic (using 
`Lowering`), but those intrinsics aren't guaranteed to exist on other hardware 
platforms, and in this case, we substitute the intrinsic with more complicated 
computation (using `Legalization`)





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