For this problem, modify the hardware to include the three following instructions in the instruction set. These instructions are a combination of a jump and addi instruction.

jbdec rd$,$imm # X$[$rd$]$ X$[$rd$]-1$; PC PC $+$ sext$($imm$)$

jhdec rd$,$imm # X$[$rd$]$ X$[$rd$]-2$; PC PC $+$ sext$($imm$)$

jwdec rd$,$imm # X$[$rd$]$ X$[$rd$]-4$; PC PC $+$ sext$($imm$)$

Example: jhdec x$10,$my$\_$label # jump to my$\_$label; increase x$10$ by $2$

For this problem, fully describe the following:

$($a$)$ Required changes to the RISC$-$V MCU hardware

$($b$)$ Required changes the RISC$-$V assembler

$($c$)$ Required changes in RISC$-$V memory requirements

$($d$)$ Describe why these instructions are potentially useful

$($e$)$ Could these instructions be used to call subroutines