How many RISC$-$V instructions does it take to implement the c code from exercise $2\mathrm{.}25?$ If the variables a and b are initialized to $10$ and $1$ and all elements of D are intially $0,$ what is the t

$20$:$04424$

computer$-$organization$-$and$-$design$-$risc$-$v$-$edition$-$the$-$hardw.

Chapter$\_02-3$

Chapter$\_02-2$

computer$-$

T:

executed?

$2\mathrm{.}24\mathrm{.}4[5]$$$2\mathrm{.}7>$ For the loop written in RISC$-$V assembly above, replace the instruction "beq $6,0,$ DONE" with the instruction $"$b$7$t $6,0,$ DONE" and write the equivalent $C$ code.

$2\mathrm{.}25[10]$$$2\mathrm{.}7>$ Translate the following $C$ code to RISC$-$V assembly code. Use a minimum number of instructions. Assume that the values of $a,b,i,$ and $j$ are in registers $5,6,7,$ and $29,$ respectively. Also, assume that register $10$ holds the base address of the array $D.$

$2\mathrm{.}26[5]$$$2\mathrm{.}7>CD2\mathrm{.}27[5]$$$2\mathrm{.}7>i5,6t$ addi $x6,0,0$

addi $29,0,100$

LOOP: $1wx7,0(x10)$

add $5,5,7$

addi $10,10,4$

addi $6,6,1$

$blt6,29,$ LOOP rojalt $=0$

$29=100$

$x=$MmanMMM$[0]$

$x5$ : $it$ men Arrey $[0]2\mathrm{.}28[10]$$$2\mathrm{.}7>$ Rewrite the loop from Exercise $2\mathrm{.}27$ to reduce the number of RISC$-$V instructions executed. Hint: Notice that variable $i$ is used only for loop control.otal number of risc$-$v instructions executed to complete the loop?