Sign Extend operation

Hi BadOmen.

Thanks for reply.

I know how to accelerate the performance manually. But this code was generated by Nios II GCC. Manual optimization requires source modifying. I don't wanna touch source code....

"soft" DSP means instance multiplier with LEs and memory? Could you tell me which option to do that?# or can I find backlog?

But sounds like it is BIG resource requirement and SLOW fMax... I need shift performance, don't need multiplier.

Is there any way to embedded user custom instruction as shift (or sign extension) operation? Nios I can do so.

Thanks in advance.