[fpc-devel] Question about Word128

[J. Gareth Moreton]

 I'll happily give it a shot, so long as I don't give myself too many
side-projects that I forget more important things!

 Gareth aka. Kit

 On Tue 07/08/18 22:06 , Kirinn kirinn at mooncore.eu sent:

To be clear, 128-bit octawords and the like are not natively supported on
most consumer-oriented processors. To support 128-bit operations, an
extensive emulation layer would need to be set up, not an easy task within
the scope of a compiler and the RTL. 

If you need 128-bit integer maths in the near future, your best bet would
be to write a quick and dirty implementation yourself with records and
operator overloading, as Sven described. Has anyone done that yet? It might
make an interesting unit for the Free Component Library or something. 

I note that SysUtils includes an "Int128Rec", which is a record type for
holding a 128-bit int. Looks like it's currently used only by
InterlockedCompareExchange128. Someone brave could expand upon that. 

~Kirinn

 On 08/07/2018 03:11 PM, J. Gareth Moreton wrote:
    I think there was talk at one point about implementing Float128 (or
"Quadruple") for Free Pascal, mostly for internal compiler purposes.  For
OWords though (or is it EWords or DQWords?) I think a library or package
will be better initially.  Still, it might be something to consider if
Intel or another processor manufacturer introduce 128-bit number functions
for XMM registers and equivalent.

  Gareth aka. Kit

 On Tue 07/08/18 10:09 , Sven Barth via fpc-devel
fpc-devel at lists.freepascal.org [1] sent:
      Aelita  schrieb am Di., 7. Aug. 2018, 09:53:
  Hello!

 My name is Aelita and for many years I have been fruitfully using your
wonderful freepascal
 for my research in algebra, geometry and physics.
 Thank you for your inspirational work!

 I'm very interested in seeing the numbers Word128 and Int128 appear in
freepascal
 (with natural operations A*B, A div B, A mod B, A xor B, A shl N, etc.)!

 Is there a chance that this will happen in the near future?

  Using records and operator overloading you can implement them yourself.
No need to burden the compiler with it. The only disadvantage would be the
inability to use that large literals... but that could be helped a bit with
conversions from floating points,at least if full accuracy isn't
required.  
  Regards,   Sven         _______________________________________________
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