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