[llvm] [RISCV] and x (sub -1, y) -> andn x y (PR #129253)

[Sergei Barannikov via llvm-commits]

s-barannikov wrote:

> > Isn't sub -1, x canonicalized to xor, -1?
> 
> Currently, I think they are not.

But it should be: https://github.com/llvm/llvm-project/blob/3f63e1c834e000d4ea95d667ae224cc232927196/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp#L3969


https://github.com/llvm/llvm-project/pull/129253