Similar to `maddhdu` and `maddld`, but allow for a big-integer rolling
accumulation affect: `RC` effectively becomes a 64-bit carry in chains
-of highly efficient loop-unrolled arbitrary-length big-integer operations.
+of highly-efficient loop-unrolled arbitrary-length big-integer operations.
Similar to `divdeu`, and has similar advantages to `maddedu`,
-Modulo result is available with the quotient.
+Modulo result is available with the quotient in a single instruction
+allowing highly-efficient arbitrary-length big-integer division.
**Notes and Observations**:
3. Both instructions have been present in Intel x86 for several decades.
4. Neither instruction is present in VSX: these are 128/64 whereas
VSX is 128/128.
-5. `maddedu` and `divmod2du` are inverses of each other, including
+5. `maddedu` and `divmod2du` are full inverses of each other, including
when used for arbitrary-length big-integer arithmetic
**Changes**