wenlei added a comment.

In D77925#2220169 <https://reviews.llvm.org/D77925#2220169>, @mehdi_amini wrote:

> I rather have a non closed list of veclib: if you just have a map keyed by 
> string instead of an enum it should just work out?

The veclib type is also tied to the accepted values for `-fveclib`, which is a 
list of supported lib, anything outside of the list is rejected with error. If 
you want to allow arbitrary strings as key, it's inconsistent with the 
restricted/closed values for `-fveclib`. So basically there's no openness from 
clang/llvm tool, while there was some openness through the libraries. I think 
by introducing a "Custom" veclib type, we can solve the impedance mismatch 
there. And in the XLA case, conceptually it's an indeed a custom veclib, right? 
Functionality-wise, `Custom` should just work for XLA usage too.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D77925/new/

https://reviews.llvm.org/D77925

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