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+---- Thread: WARNING: big brain subtractor (/thread-14037.html)
WARNING: big brain subtractor - EEVV - 05-17-2018
Code:
/warp bigbrainb i g
by EEVV and HyperXti
![[Image: xTO9WM5.png]](https://i.imgur.com/xTO9WM5.png)
![[Image: rXS405U.png]](https://i.imgur.com/rXS405U.png)
![[Image: CQ70AP7.png]](https://i.imgur.com/CQ70AP7.png)
RE: WARNING: big brain subtractor - Matthew - 05-17-2018
this makes me H A R D
RE: WARNING: big brain subtractor - baslak19 - 05-18-2018
Subtractor? You know you could just use two’s complement addition.
RE: WARNING: big brain subtractor - konsumlamm - 05-18-2018
(05-18-2018, 12:09 AM)baslak19 Wrote: Subtractor? You know you could just use two’s complement addition.
this is hex, so you can't use two's complement, you could use 16's complement
apart from that hex subtraction is faster than addition (at least when they used magicals algorithm which i think they did)
RE: WARNING: big brain subtractor - baslak19 - 05-18-2018
eBut you still have to ripple borrow, right?
Ty! 16’s complement, yes. I’m researching edge cases with hex 16’s cmp. right now.
RE: WARNING: big brain subtractor - EEVV - 05-19-2018
No ripple. This uses BCS logic which is derived from CCA. It uses instant diodes and comparators to generate borrows. The whole thing is literally 6 ticks to compute a subtraction.
RE: WARNING: big brain subtractor - Trecar - 05-19-2018
Cool, when do we get a 64 Bit CPU?