1.global atan 2.type atan,@function 3atan: 4 fldl 4(%esp) 5 mov 8(%esp),%eax 6 add %eax,%eax 7 cmp $0x00200000,%eax 8 jb 1f 9 fld1 10 fpatan 11 ret 12 # subnormal x, return x with underflow 131: fsts 4(%esp) 14 ret 15