(42, all flavours) Integer Division - how?

[Werner]

Anybody know how to implement integer division in a fast and reliable way?
And, no, / IP is not the answer..

Illustrating my point with a hypothetical 2-digit calculator, then:
79 DIV 40 = 1
200 DIV 3 = 66
890 DIV 99 = 8
2300 DIV 40 = 57

the goal is to be able to split Y=Q*X+R when possible, i.e. up to Cc00 = Qq*Xx + Rr with Cc and Rr < Xx, and Cc00 DIV Xx should give Qq (all single letters are half-length integers, or single digits in the case of the 2-digit calculator)

42S equivalents
(4e11+39) DIV 40 = 1e10 (/ IP = 1e10+1)
2e12 DIV 3 = 666666666666 (666666666667)
5e23 DIV (1e12-1) = 5e11 (5e11+1)
(2e23+3e12) DIV 4e11 = 5e11+7 (5e11+8) (round-to-even, and a particularly difficult one to get right)

Free42 equivalents
(4e33+39) DIV 40 = 1e32
2e34 DIV 3 = 666...666

I CAN do it, but it's not remotely pretty.
It would be a welcome addition to Free42 ;-)

Cheers, Werner