GET_BIT
GET_BIT(BZ_X_MAPPING_1, uc);
GET_BIT(BZ_X_MAPPING_2, uc);
GET_BIT(BZ_X_SELECTOR_3, uc);
GET_BIT(BZ_X_CODING_2, uc);
GET_BIT(BZ_X_CODING_3, uc);
GET_BIT(label2, zj); \
do { GET_BIT(prob + symbol, symbol) } while (symbol < 0x100);
#define TREE_GET_BIT(probs, i) { GET_BIT((probs + i), i); }
if( 0 == GET_BIT( abs_func_vector, idx ) )