.global acosl
.type acosl,@function
acosl:
fldt 4(%esp)
fld %st(0)
fld1
fsub %st(0),%st(1)
fadd %st(2)
fmulp
fsqrt
fabs # fix sign of zero (matters in downward rounding mode)
fxch %st(1)
fpatan
ret