I dunno - in some architectures, a new instruction is just a couple of lines of verilog to implement in the silicon: https://github.com/YosysHQ/picorv32/blob/m

I dunno - in some architectures, a new instruction is just a couple of lines of verilog to implement in the silicon: https://github.com/YosysHQ/picorv32/blob/master/picorv32.v#L1068 https://github.com/YosysHQ/picorv32/blob/master/picorv32.v#L... (this is the 'subtract' alu instruction decoder in pico riscv for example)