.global atan2
.type atan2,@function
atan2:
        fldl 4(%esp)
        fldl 12(%esp)
        fpatan
        fstl 4(%esp)
        mov 8(%esp),%eax
        add %eax,%eax
        cmp $0x00200000,%eax
        jae 1f
                # subnormal x, return x with underflow
        fsts 4(%esp)
1:      ret