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 ret 12 # subnormal x, return x with underflow 131: fld %st(0) 14 fmul %st(1) 15 fstps 4(%esp) 16 ret 17