[llvm] [RISCV] Fold (add (srl x, n), (srl x, n)) into (srl x, n-1) (PR #144507)

[Björn Pettersson via llvm-commits]

bjope wrote:

> > I may have an alternate proposal for this patch. Investigating.
> 
> My alternate proposal #144565 which covers the READ_VLENB cases.

Thanks! That seems like a better solution. I'll abandon this.

https://github.com/llvm/llvm-project/pull/144507