Have you demonstrated that it works? IIRC the current behavior is because some LLVM version (16, IIRC) didn't work with GHC (threw errors from opt, I think).
llvm 20 is out but unlike in earlier versions of ghc moving to it means you can no longer use llvm:
Loaded package environment from /Users/avie/.ghc/aarch64-darwin-9.12.2/environments/default
[1 of 2] Compiling Main ( hello.hs, hello.o )
<no location info>: error: [GHC-66599]
GHC was not configured with a supported LLVM toolchain
Make sure you have installed LLVM between [13 and 20) and reinstall GHC to make -fllvm work
configure: We only support llvm 13 upto 20 (non-inclusive) (found 20.1.1).
Can we move to llvm 20 on HEAD and can we revert to the old behavior on ghc 9.12.3?
Should I file an ER?
Thanks
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