1.global acosf
 2.type acosf,@function
 3acosf:
 4	flds 4(%esp)
 5	fld %st(0)
 6	fld1
 7	fsub %st(0),%st(1)
 8	fadd %st(2)
 9	fmulp
10	fsqrt
11	fabs         # fix sign of zero (matters in downward rounding mode)
12	fxch %st(1)
13	fpatan
14	fstps 4(%esp)
15	flds 4(%esp)
16	ret