[llvm] [RISCV] Decompose single source shuffles (without exact VLEN) (PR #126108)

[Philip Reames via llvm-commits]

preames wrote:

> I'm currently double checking that the commit cleanly reverts (i.e. there are no later test changes that would be invalidated by the revert).

I agree that the right thing to do here to revert while we're investigating.  I'm happy to handle that if you'd rather.  Can you file an issue for the failure, ideally with a pointer to how to reproduce the torture suite failure?

https://github.com/llvm/llvm-project/pull/126108