I need help fixing my code for this $64-$bit by $64-$bit multiplier that develops an assembly program which receives two $64-$bit numbers x $=0$x$4$A$023201$BA$01$DE$11$and y $=$

$0$x$8$AA$0$BB$00$CC$001230,$performs multiplication, and produces a $128-$bit product.

Each register should be $32$ bit. I got some help earlier but couldn$$t fully understand what was wrong with the code I originally had.

Can I please get some insight and help on what$$s wrong with my code?

loop

; main program loop

; insert your code here

; x $=0$x$4$A$023201$ BA$01$ DE$11$

; y $=0$x$8$AA$0$ BB$00$ CC$001230$

LDR r$0,=0$xBA$01$DE$11$ ; LSB$32($x$)$

LDR r$1,=0$x$4$A$023201$ ; MSB$32($x$)$

LDR r$2,=0$xCC$001230$ ; LSB$32($y$)$

LDR r$3,=0$x$8$AA$0$BB$00$ ; MSB$32($y$)$

; Clear the upper bits register

MOV r$12,$ #$0$

; Perform the multiplications

UMULL r$4,$ r$5,$ r$0,$ r$2$

UMULL r$6,$ r$7,$ r$1,$ r$2$

UMULL r$8,$ r$9,$ r$0,$ r$3$

UMULL r$10,$ r$11,$ r$1,$ r$3$

; Combine the results

ADDS r$7,$ r$7,$ r$9$ ; Add the middle parts

ADCS r$11,$ r$11,$ #$0$ ; Add the carry to the most significant part

ADDS r$6,$ r$6,$ r$8$ ; Add the lower parts

ADCS r$7,$ r$7,$ #$0$ ; Add the carry to the middle parts

ADDS r$11,$ r$11,$ r$6$ ; Add to the second most significant part

ADCS r$12,$ r$12,$ r$7$ ; Finally, add the carry to the most significant part

; Store the results in registers

MOV r$9,$ r$5$ ; Least significant part

MOV r$10,$ r$11$ ; Second least significant part

MOV r$11,$ r$12$ ; Most significant part

B loop ;