$2.$ a$)$ Contrast the architectures CISC and RISC. $(2$M$)$

b$)$ Explicate the values of R$0,$ R$1,$ after the following instruction is executed. $(3$M$)$

R$0=0$x$00000000,$ R$1=0$x$00000088$

RSB R$0,$ R$1,$ #$0$

c$)$ What do the following instructions mean and what is accomplished $($mention all the

constraints and also the status of CPSR$)?$ Before the instruction execution CPSR contains

$0$x$50000010.$ Assume appropriate values for all registers. $(5$M$)$

R$0=0$x$00000001$; R$1=0$x$00000001$; R$2=0$x$00000002$; R$3=0$x$00000003$; R$4=0$x$00000004$;

R$5=0$x$00000005$; R$6=0$x$00000006$; R$7=0$x$00000007$;

i$.$ ANDLT R$1,$ R$4,$ R$3$

ii$.$ ADDEQ R$2,$ R$4,$ R$2$

iii. MOVGT R$7,$ R$5$

iv$.$ SUBAL R$1,$ R$2,$ R$7$

v$.$ ADDS R$5,$ R$7,$ R$7$

vi$.$ SUBAL R$0,$ R$0,$ R$1,$ LSL #$2$

vii. RSBEQ R$3,$ R$3,$ R$2,$ LSL #$4$

Using Binary encoding convert any two of the above instructions into machine code equivalents.