The arithmetic codec uses some subroutines in combination with some comparators in a very inefficient way. Example: ``` IF( GT_32( L_multi31x16_X2( range_h, range_l, p[8] ), cum ) ) { p = p + 8; } ``` Initially, the `Word32 range` is split into Word16 `range_h` and `range_l` on cost of 4 operations. The split is not needed at all. The function `L_multi31x16_X2` costs 3 operations instead of 1. The comparison of the product with Word32 could be merged into a MSU operation without additional costs. The costly IF-clause could be changed into lower-case "if". The new solution (naming still t.b.d.) could then look like that: ``` if (L_msui_32_16(cum, range, p[8]) < 0) { p = p + 8; move16(); } ```