Nios II is all about customizing, the essence of a softcore. Custom instruction is an interesting feature of the Nios II.
Custom instruction involves 2 inputs dataa and datab. Does this mean that it is not possible to create SIMD type custom instruction? Can the register file of a Nios II processor be extended so it can be shared with an SIMD type instruction?
Note: Purpose is to hardware accelerate image processing algorithms with a Nios II.