> On Sep 26, 2023, at 08:31, Tom Browder <tom.brow...@gmail.com> wrote:
>
> On Mon, Sep 25, 2023 at 20:07 Bruce McCoy via gnucash-user <
> gnucash-user@gnucash.org> wrote:
> ...discussion of GnuCash's handling of numbers...
>
> Does GnuCash use the Gnu Multiple Precision Arithmetic (GMP) library?
No. Like all infinite precision numerical methods it allocates from the heap
and that makes it too slow. GnuCash uses a pair of stack-allocated 128-bit
integers (see
https://github.com/Gnucash/gnucash/blob/stable/libgnucash/engine/gnc-int128.hpp)
to compose rational numbers
(https://github.com/Gnucash/gnucash/blob/stable/libgnucash/engine/gnc-rational.hpp)
for computation that's reduced to int64_t-based rationals
(https://github.com/Gnucash/gnucash/blob/stable/libgnucash/engine/gnc-numeric.hpp)
for presentation and storage. Intermediate results are reduced to help prevent
overflows and a variety of rounding techniques are implemented in
https://github.com/Gnucash/gnucash/blob/stable/libgnucash/engine/gnc-rational-rounding.hpp.
Regards,
John Ralls
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