Nice read! Thanks for taking time to work on SIMD instructions in GHC 
I would maybe request a redo of the NCG benchmarks but with the same GHC version as the other benchmarks (GHC 9.8.4) so it’s easier to compare LLVM vs NCG.
(Or did I miss something and is it not possible to use the same GHC for all benchmarks? Either GHC 9.8.4 for the NCG or also 9.12.1 for the LLVM etc.?)