T=d f ld
V=x
R=-1,1,0.25
F=(acos(x) >= 1) + \
  2*(1 <= acos(x)) + \
  4*(acos(x) <= 1) + \
  8*(1 >= acos(x))
C=fp_greaterOrEq(fp_acos(x), 1) + \
  2*fp_lessOrEq(1, fp_acos(x)) + \
  4*fp_lessOrEq(fp_acos(x), 1) + \
  8*fp_greaterOrEq(1, fp_acos(x))
