branching procedure

# nonLeaf.asm
# function branches off to another, clobbering $ra
.data

.text

.globl main
main:
    nop
    nop
    nop
    nop
    nop
    nop

    li $a0, 9
    li $a1, 4
    li $a2, 1
    li $a3, 2


    jal f1
    nop

f1:

    add $t0, $a0, $a1
    add $t1, $a2, $a3
    jal joesJam
    sub $v0, $t0, $t1
    jr  $ra


joesJam:
    add $v0,$a0,$a1
    jr $ra

exit: