1.global atanf 2.type atanf,@function 3atanf: 4 flds 4(%esp) 5 mov 4(%esp),%eax 6 add %eax,%eax 7 cmp $0x01000000,%eax 8 jb 1f 9 fld1 10 fpatan 11 fstps 4(%esp) 12 flds 4(%esp) 13 ret 14 # subnormal x, return x with underflow 151: fld %st(0) 16 fmul %st(1) 17 fstps 4(%esp) 18 ret 19