All values for size("sz") are DWORDs
Other parameters are QWORDs/QWORD PTRs


AddXL ptr1, ptr2, sz1, sz2

SubXL ptr1, ptr2, sz1, sz2

mulInt64 m, ptr, sz

divInt64 d, ptr*, sz
d - Signed 64-bit divisor sz - Dword
ptr - to the "leftmost" digit in memory

returns remainder

NegateXL sz, ptr

cmpsqProc count, ptr1*, ptr2*

findTopDigit count, ptr*

findBotDigit count, ptr

AddQW ptr, value

incXL ptr

decXL ptr