Question

write a program that multiply 64 bit number by 32 bit register in assembly

Answer 1

& main:
li $s0, 5& #load 5 into register s0
li $s1, 4& #load 4 into register s1

MULTIPLY:
li $s3, 1& #counter to control how many times we go through loop
add $s4, $s0, $s4
add $s5, $s3, $s5

bne $s5, $s1, MULTIPLY& #if control and s1 aren't equal re-enter loop
j EXIT #otherwise jump to EXIT

EXIT:
li $v0, 1
la $a0, ($s4)
syscall & #system call to print out result

jr $31 #end program