T=d f ld
V=x
R=-3,3,0.5
F=1*(log2(abs(x))=-2) + \
  2*(log2(abs(x))<-2) + \
  4*(log2(abs(x))<=-2) + \
  8*(log2(abs(x))>-2) + \
  16*(log2(abs(x))>=-2) + \
  32*(log2(abs(x))!=-2)
C=1*fp_equal(fp_log2(fp_abs(x)),-2) + \
  2*fp_less(fp_log2(fp_abs(x)),-2) + \
  4*fp_lessOrEq(fp_log2(fp_abs(x)),-2) + \
  8*fp_greater(fp_log2(fp_abs(x)),-2) + \
  16*fp_greaterOrEq(fp_log2(fp_abs(x)),-2) + \
  32*fp_nequal(fp_log2(fp_abs(x)),-2)