Computer

AREA my_fancy_asm_code, CODE, READONLY EXPORT aTask1_4 EXPORT aTask1_3 EXPORT aTask1_2 EXPORT aTask2 EXPORT aTask3 EXPORT aTask4 EXPORT aTask5 EXPORT aTask6 IMPORT A IMPORT B IMPORT C IMPORT D ALIGN ; void aTask1_4(void)---Arithmetic with four registes aTask1_4 PROC LDR r0, =B LDR r1, [r0] LDR r0, =C LDR r2, [r0] LDR r0, =D LDR r3, [r0] ADD r1, r2 SUB r1, r3 LDR r0, =A STR r1, [r0] BX lr ENDP ; void aTask1_3(void)---Arithmetic with three registes aTask1_3 PROC LDR r0, =B LDR r1, [r0] LDR r0, =C LDR r2, [r0] LDR r0, =D LDR r0, [r0] ADD r1, r2 SUB r1, r0 LDR r0, =A STR r1, [r0] BX lr ENDP ; void aTask1_2(void)---Arithmetic with two registes aTask1_2 PROC LDR r0, =B LDR r1, [r0] LDR r0, =C LDR r0, [r0] ADD r1, r0 LDR r0, =D LDR r0, [r0] SUB r1, r0 LDR r0, =A STR r1, [r0] BX lr ENDP ; uint32_t aTask2(uint32_t n)---Find the factorial of n aTask2 PROC MOV r1, #1 ; n! MOV r2, #1 ; loop var i aTask2_lpd CMP r2, r0 ; i <= n ? BGT aTask2_end MUL r1, r1, r2 ADD r2, #1 B aTask2_lpd aTask2_end MOV r0, r1 BX lr ENDP ; Find the index of the max number in an array arr of size n ; uint32_t aTask3(int32_t *arr, int32_t n); aTask3 PROC PUSH {r4, r5, lr} LDR r4, [r0] ; maxVal MOV r3, #0 ; maxLoc MOV r2, #1 ; loop index i aTask3_lpe CMP r2, r1 BGE aTask3_end LDR r5, [r0, r2, LSL #2] CMP r5, r4 MOVGT r4, r5 MOVGT r3, r2 ADD r2, #1 B aTask3_lpe aTask3_end MOV r0, r3 POP {r4, r5, pc} ENDP ; Count the number of deimal digits of an uint32_t number ; uint32_t aTask4(uint32_t n); aTask4 PROC MOV r1, #0 ; # of digits MOV r2, #10 aTask4_lpf CBZ r0, aTask4_end UDIV r0, r0, r2 ; signed division ADD r1, #1 B aTask4_lpf aTask4_end MOV r0, r1 BX lr ENDP ; Set the parity bit ; parity_odd = 0 for even parity check and 1 for odd parity check. ; uint32_t aTask4(uint32_t num, uint32_t parity_odd); aTask5 PROC aTask5_lpg CBZ r0, aTask5_end EOR r1, #1 SUB r2, r0, #1 AND r0, r2 B aTask5_lpg aTask5_end MOV r0, r1 BX LR ENDP ; Count the number of binary 1s ; uint32_t cTask6(uint32_t x); aTask6 PROC MOV r1, r0, LSR #31 aTask6_lph CBZ r0, aTask6_end MOVS r0, r0, LSL #2 ADC r1, r0, LSR #31 B aTask6_lph aTask6_end MOV r0, r1 BX LR ENDP END