Basic Function Unit Design (ALU + shifter)

Hi,

I need to design the function unit attached in quartus. I decided to use Block Diagram/Schematic file then export as vhdl.

Is there anything critical you think I should tweak before i start testing. Everything compiled without errors although I have warnings of;

-No superset bus at connection

-Pin ".. " is missing source

-Primitive "XOR" of instance "inst1" not used

-Warning(13410): Pin "F0" is stuck at GND

Are these warnings fatal when exporting to VHDL code?

thanks