DIVU - MIPS instruction reference

divuDivide unsigned 
Divides unsigned integers: with three operands the quotient goes to $t1, with two it goes to LO and the remainder to HI.
Used in Flappy birdMIPS assembly
 
Forms  divu ,   
Pseudo-instructionsThe assembler turns these into one or more real instructions.
  divu , ,   
Set $t1 to ($t2 divided by $t3, unsigned integer division)
 divu , ,   
Operands $t1 Any general-purpose register, $0 to $31, using its numeric or named spelling, such as $8 or $t0 ($zero is $0; $ra is $31). 
$t2 A general-purpose register. It may be the same register as $t1. 
$t3 A general-purpose register. It may be the same register as $t1. 
imm An immediate value: a signed 16-bit value (-32768 to 32767) or a 32-bit value (-2147483648 to 4294967295). The assembler chooses a supported encoding for the value and other operands; a pseudoinstruction may expand into several instructions. 
Sets LO to the quotient and HI to the remainder. Division by zero produces undefined results with no exception. Use 'mflo' for the quotient; 'mfhi' for the remainder.
 # Divide 23 by 5. Inspect LO: quotient 4; inspect HI: remainder 3.
li $t0, 23
li $t1, 5
divu $t0, $t1
mflo $t2
mfhi $t3