[PATCH] D11569: [AArch64] Favor extended reg patterns for sub

[Renato Golin]

rengolin added a comment.

Is this avoiding a shift plus extend sub, for a shift-extend sub?

If so, would be good to add a CHECK-NOT for the extra instructions that you don't want to see.

Otherwise, looks good to me.


http://reviews.llvm.org/D11569