[Vm-dev] Re: [squeak-dev] New Cog VMs available

Nicolas Cellier nicolas.cellier.aka.nice at gmail.com
Tue Jul 12 20:50:28 UTC 2016

2016-07-12 22:24 GMT+02:00 Luciano Notarfrancesco <luchiano at gmail.com>:

> On Sat, Apr 23, 2016 at 7:48 PM, Eliot Miranda <eliot.miranda at gmail.com>
> wrote:
>> Plugins:
>> Upgrade LargeIntegersPlugin to v2.0
>> LargeInteger primitives now deal with 32-bits digits.  No change to image
>> code.
>> Memory is 8 bytes aligned on Spur. When storing 32/64 bits large
>> integers values, allways fill the eight bytes whatever the
>> effectivily used size, rather than bother with dissertion of size.
>> Generate integer type checking as C macros rather than direct/indirect
>> interpreterProxy function call in plugins. This, and 32-bit accessing mean
>> singificantly faster large integer arithmetic.
> Awesome!
> The legs are in the architecture endianness?
> What are the reasons to not use GMP? Could we use it if was already
> installed in the host platform? It seems to me that it would be quite
> straight forward to call to the GMP low-level API from the
> LargeIntegersPlugin, without making any changes in the image.
> https://gmplib.org/manual/Low_002dlevel-Functions.html
> Yes, it would be a nice projet to write a GMPLargeIntegersPlugin.
GNU smalltalk is using gmp already, so it might be quite easy, no need to
re-invent, just to rewrite.
GMP is LGPL, I don't know the impact on our VM, but it in no way a show
stopper for experimentation.
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