MRS_SAFE_MASK
(MRS_EXACT | (fields[j].type & MRS_SAFE_MASK));
(MRS_EXACT | (fields[j].type & MRS_SAFE_MASK));
#define MRS_SAFE(x) (((x) << MRS_SAFE_SHIFT) & MRS_SAFE_MASK)
#define MRS_SAFE_VAL(x) (((x) & MRS_SAFE_MASK) >> MRS_SAFE_SHIFT)