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Work on the bignum problem, ongoing.

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Simon Brooke 2025-07-05 13:58:18 +01:00
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state-of-play.md
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# State of Play
## 20250704
Right, I'm getting second and subsequent integer cells with negative values, which should not happen. This is probably the cause of (at least some of) the bignum problems. I need to find out why. This is (probably) fixable.
```lisp
:: (inspect 10000000000000000000)
INTR (1381256777) at page 3, offset 873 count 2
Integer cell: value 776627963145224192, count 2
BIGNUM! More at:
INTR (1381256777) at page 3, offset 872 count 1
Integer cell: value -8, count 1
```
Also, `print` is printing bignums wrong on ploughwright, but less wrong on mason, which implies a code difference. Investigate.
## 20250314
Thinking further about this, I think at least part of the problem is that I'm storing bignums as cons-space objects, which means that the integer representation I can store has to fit into the size of a cons pointer, which is 64 bits. Which means that to store integers larger than 64 bits I need chains of these objects.