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*, rngPak
rngpak: High Dword - number of zero 64 bit digits on the "right"
Low Dword - size
ptr - to the "leftmost" digit in memory

NegateXL sz, ptr

cmpsqProc
count, ptr1*, ptr2*

findTopDigit
count, ptr*

findBotDigit
count, ptr

AddQW
ptr, value

incXL
ptr

decXL
ptr