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824 FIXP_DBL fLog2(FIXP_DBL x_m, INT x_e, INT *result_e)
838     /* Move input value x_m * 2^x_e toward 1.0, where the taylor approximation
845       x_e = x_e - b_norm;
861     /* Add exponent part. log2(x_m * 2^x_e) = log2(x_m) + x_e */
862     if (x_e != 0)
866       enorm = DFRACT_BITS - fNorm((FIXP_DBL)x_e);
868       result_m = (result_m >> (enorm-1)) + ((FIXP_DBL)x_e << (DFRACT_BITS-1-enorm));
880 FIXP_DBL fLog2(FIXP_DBL x_m, INT x_e)
887     x_m = fLog2(x_m, x_e, &result_e);