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 fstpl 4(%esp) 12 fldl 4(%esp) 13 ret 14 # subnormal x, return x with underflow 151: fsts 4(%esp) 16 ret 17