Practice Problems: Set $1$

Problem $0$

Write an assembly program that resets the saturation flag and swaps the negative flag with the zero flag in

the application program status register.

Problem $1$

Suppose $r0=0xA,$ and $r1=0xB2.$ Determine the values of the $N,Z,C,V,$ and $Q$ flags and the $r2$ and $r3$

registers after executing the following assembly program.

SUB $r4,r4$

MSR xpsr$\_$nzcvq$,$ r$4$

LSRS r$0,$ #$2$

$SBCSr0,r1$

ADC r$3,$ r$0,$ r$1,$ LSR #$2$

SSAT $12,$#$3,r3$

Problem $2$

Write an assembly program that performs a left$-$shift operation on a $64-$bit unsigned number by the value

stored in register $12.$ Suppose that the least significant $32$ bits of the number are stored in register $r0,$ while

the most significant $32$ bits are stored in register $r1.$