Re: [fpc-devel] ARM/AARCH64 work

[J. Gareth Moreton via fpc-devel]

Submitted a patch with the "magic division" and a second patch with a new bench 
test to showcase the 
improvements.  I hope it is to your satisfaction.

https://bugs.freepascal.org/view.php?id=38806

Gareth aka. Kit


On Mon 26/04/21 16:25 , "J. Gareth Moreton" gar...@moreton-family.com sent:
> I meant to say "I'm not sure" at the end there.  The joys of
> writing an e-mail on the phone!
> 
> 
> Gareth aka. KIt
> 
> 
> 
> On Mon 26/04/21 15:14 , "J. Gareth Moreton via fpc-devel" 
> fpc-devel@lists.freepascal.org sent:
> > Indeed. I'm reusing the code that generates 
> 
> > 
> 
> > the magic constant for me and any additional 
> 
> > 
> 
> > flags. I've also fixed the bug that caused 
> 
> > 
> 
> > the failure in my test. Just doing some 
> 
> > 
> 
> > final cheeks and improving my bench test.
> 
> > 
> 
> > 
> 
> > 
> 
> > It might be possible to make more code cross 
> 
> > 
> 
> > platform later on. I'mm not due.
> 
> > 
> 
> > 
> 
> > 
> 
> > Gareth aka. Kit
> 
> > 
> 
> > 
> 
> > 
> 
> > On Mon 26/04/21 17:26 , Florian Klämpfl via
> 
> > 
> 
> > fpc-develfpc-de...@lists.freepascal.org 
> > sent:
> 
> > 
> 
> > > 
> 
> > 
> 
> > > 
> 
> > 
> 
> > > 
> 
> > 
> 
> > > 
> 
> > 
> 
> > > > Am 26.04.2021 um 08:09 schrieb J.
> Gareth 
> > 
> 
> > Moreton
> 
> > 
> 
> > > via fpc-devel :
> 
> > 
> 
> > > > 
> 
> > 
> 
> > > 
> 
> > 
> 
> > > >  and the other is implementing
> "magic
> > 
> 
> > > division" 
> 
> > 
> 
> > > > where division by a constant is
> replaced 
> > 
> 
> > with a
> 
> > 
> 
> > > multiplication.  
> 
> > 
> 
> > > 
> 
> > 
> 
> > > 
> 
> > 
> 
> > > You are aware there is code for arm 32 bit 
> 
> > 
> 
> > and e.g. x86 which can most
> 
> > 
> 
> > > likely be reused/adapted? It might be even 
> 
> > 
> 
> > that meanwhile somebody made a
> 
> > 
> 
> > > generic implementation of it?
> 
> > 
> 
> > > 
> 
> > 
> 
> > 
> 
> > 
> 
> > ___
> 
> > 
> 
> > > 
> 
> > 
> 
> > > fpc-devel maillist  -  fpc-
> 
> > 
> 
> > de
> 
> > vel@
> lists.freepascal.org
> > > https://lists.freepascal.org/cgi-
> > bin/mailman/listinfo/fpc-devel
> 
> > 
> 
> > > 
> 
> > 
> 
> > > 
> 
> > 
> 
> > > 
> 
> > 
> 
> > > 
> 
> > 
> 
> > > 
> 
> > 
> 
> > 
> 
> > 
> 
> > ___
> 
> > 
> 
> > fpc-devel maillist  -  fpc-devel@lists.freepascal.org
> > https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-devel
> 
> > 
> 
> > 
> 
> > 
> 
> > 
> 
> > 
> 
> 
> 
> 
> 
> 
> 

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Re: [fpc-devel] ARM/AARCH64 work

[J. Gareth Moreton via fpc-devel]

I meant to say "I'm not sure" at the end there.  The joys of writing an e-mail 
on the phone!

Gareth aka. KIt

On Mon 26/04/21 15:14 , "J. Gareth Moreton via fpc-devel" 
fpc-devel@lists.freepascal.org sent:
> Indeed. I'm reusing the code that generates 
> 
> the magic constant for me and any additional 
> 
> flags. I've also fixed the bug that caused 
> 
> the failure in my test. Just doing some 
> 
> final cheeks and improving my bench test.
> 
> 
> 
> It might be possible to make more code cross 
> 
> platform later on. I'mm not due.
> 
> 
> 
> Gareth aka. Kit
> 
> 
> 
> On Mon 26/04/21 17:26 , Florian Klämpfl via 
> 
> fpc-develfpc-de...@lists.freepascal.org 
> sent:
> 
> > 
> 
> > 
> 
> > 
> 
> > 
> 
> > > Am 26.04.2021 um 08:09 schrieb J. Gareth 
> 
> Moreton
> 
> > via fpc-devel :
> 
> > > 
> 
> > 
> 
> > >  and the other is implementing "magic
> 
> > division" 
> 
> > > where division by a constant is replaced 
> 
> with a
> 
> > multiplication.  
> 
> > 
> 
> > 
> 
> > You are aware there is code for arm 32 bit 
> 
> and e.g. x86 which can most
> 
> > likely be reused/adapted? It might be even 
> 
> that meanwhile somebody made a
> 
> > generic implementation of it?
> 
> > 
> 
> 
> 
> ___
> 
> > 
> 
> > fpc-devel maillist  -  fpc-
> 
> de
> v...@lists.freepascal.org
> > https://lists.freepascal.org/cgi-
> bin/mailman/listinfo/fpc-devel
> 
> > 
> 
> > 
> 
> > 
> 
> > 
> 
> > 
> 
> 
> 
> ___
> 
> fpc-devel maillist  -  fpc-devel@lists.freepascal.org
> https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-devel
> 
> 
> 
> 
> 

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Re: [fpc-devel] ARM/AARCH64 work

[J. Gareth Moreton via fpc-devel]

Indeed. I'm reusing the code that generates 
the magic constant for me and any additional 
flags. I've also fixed the bug that caused 
the failure in my test. Just doing some 
final cheeks and improving my bench test.

It might be possible to make more code cross 
platform later on. I'mm not due.

Gareth aka. Kit

On Mon 26/04/21 17:26 , Florian Klämpfl via 
fpc-develfpc-de...@lists.freepascal.org 
sent:
> 
> 
> 
> 
> > Am 26.04.2021 um 08:09 schrieb J. Gareth 
Moreton
> via fpc-devel :
> > 
> 
> >  and the other is implementing "magic
> division" 
> > where division by a constant is replaced 
with a
> multiplication.  
> 
> 
> You are aware there is code for arm 32 bit 
and e.g. x86 which can most
> likely be reused/adapted? It might be even 
that meanwhile somebody made a
> generic implementation of it?
> 

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> 
> 
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Re: [fpc-devel] ARM/AARCH64 work

[Florian Klämpfl via fpc-devel]

> Am 26.04.2021 um 08:09 schrieb J. Gareth Moreton via fpc-devel 
> :
> 
>  and the other is implementing "magic division" 
> where division by a constant is replaced with a multiplication.  

You are aware there is code for arm 32 bit and e.g. x86 which can most likely 
be reused/adapted? It might be even that meanwhile somebody made a generic 
implementation of it?
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Re: [fpc-devel] ARM/AARCH64 work

[Joost van der Sluis]

Op 07-08-2020 om 08:00 schreef Sven Barth via fpc-devel:


Yes, the fpc.cfg is intended to have absolute paths and its located 
either in the global /etc/fpc.cfg or the user specific ~/.fpc.cfg (where 
~ is your home directory).


When you use the -va parameter, the compiler will show you where it 
looks for it's configuration-files.


Regards,

Joost.
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Re: [fpc-devel] ARM/AARCH64 work

[Sven Barth via fpc-devel]

J. Gareth Moreton  schrieb am Fr., 7. Aug. 2020,
01:22:

> Okay, got it to compile.  I had to make a cfg file with absolute paths
> though that I Have to
> explicitly reference, since the trunk build puts ppca64 into
> /usr/local/fpc/3.3.1 and I'm not sure
> where it looks for fpc.cfg normally.  Still, despite it being a little bit
> untidy, I got it to build
> at last and it means I can start comparing assembly dumps!
>

Yes, the fpc.cfg is intended to have absolute paths and its located either
in the global /etc/fpc.cfg or the user specific ~/.fpc.cfg (where ~ is your
home directory).

Regards,
Sven

>
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Re: [fpc-devel] ARM/AARCH64 work

[J. Gareth Moreton]

Okay, got it to compile.  I had to make a cfg file with absolute paths though 
that I Have to 
explicitly reference, since the trunk build puts ppca64 into 
/usr/local/fpc/3.3.1 and I'm not sure 
where it looks for fpc.cfg normally.  Still, despite it being a little bit 
untidy, I got it to build 
at last and it means I can start comparing assembly dumps!

Gareth aka. Kit


On Thu 06/08/20 22:43 , "J. Gareth Moreton" gar...@moreton-family.com sent:
> Aah, bare-bones project failed to compile with the same error, so FPC isn't
> configured properly.  Is 
> there something I need to do with, say, setting up the config file?  I'm
> trying to remember how 
> everything works with Linux.
> 
> 
> 
> Gareth aka. Kit
> 
> 
> 
> On Thu 06/08/20 22:38 , "J. Gareth Moreton" gar
> e...@moreton-family.com sent:
> > Is there a particular DB test project that I can
> pick from, or is making a
> > bare-bones project with 
> 
> > "uses db;" enough?
> 
> > 
> 
> > 
> 
> > 
> 
> > Gareth aka. Kit
> 
> > 
> 
> > 
> 
> > 
> 
> > 
> 
> > 
> 
> > On Thu 06/08/20 22:46 , "Sven Barth" p
> 
> > as
> caldra...@googlemail.com sent:
> > > J. Gareth Moreton  schrieb am Do., 6. Aug.
> 2020,
> > 22:36:
> 
> > > Hi guys, can you confirm that Lazarus
> compiles
> > on aarch64?  When I try
> 
> > > under aarch64-linux (with 
> 
> > 
> 
> > > fresh SVN checkouts), it fails with the
> error
> > message:
> 
> > > 
> 
> > 
> 
> > > Fatal: (10022) Can't find unit db used by
> fcllaz
> > 
> 
> > > 
> 
> > 
> 
> > > Can you compile a simple program that uses
> the
> > DB unit? If not, then your
> 
> > > FPC is configured incorrectly. If you can,
> 
> > then... Uhm... We'll have to
> 
> > > check further...
> 
> > 
> 
> > > Regards, Sven 
> 
> > 
> 
> > > 
> 
> > 
> 
> > 
> 
> > 
> 
> > ___
> 
> > 
> 
> > fpc-devel maillist  -  fpc-devel@lists.freepascal.org
> > https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-devel
> 
> > 
> 
> > 
> 
> > 
> 
> > 
> 
> > 
> 
> 
> 
> ___
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> 
> 
> 
> 
> 

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Re: [fpc-devel] ARM/AARCH64 work

[J. Gareth Moreton]

Aah, bare-bones project failed to compile with the same error, so FPC isn't 
configured properly.  Is 
there something I need to do with, say, setting up the config file?  I'm trying 
to remember how 
everything works with Linux.

Gareth aka. Kit

On Thu 06/08/20 22:38 , "J. Gareth Moreton" gar...@moreton-family.com sent:
> Is there a particular DB test project that I can pick from, or is making a
> bare-bones project with 
> "uses db;" enough?
> 
> 
> 
> Gareth aka. Kit
> 
> 
> 
> 
> 
> On Thu 06/08/20 22:46 , "Sven Barth" p
> ascaldra...@googlemail.com sent:
> > J. Gareth Moreton  schrieb am Do., 6. Aug. 2020,
> 22:36:
> > Hi guys, can you confirm that Lazarus compiles
> on aarch64?  When I try
> > under aarch64-linux (with 
> 
> > fresh SVN checkouts), it fails with the error
> message:
> > 
> 
> > Fatal: (10022) Can't find unit db used by fcllaz
> 
> > 
> 
> > Can you compile a simple program that uses the
> DB unit? If not, then your
> > FPC is configured incorrectly. If you can,
> then... Uhm... We'll have to
> > check further...
> 
> > Regards, Sven 
> 
> > 
> 
> 
> 
> ___
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> 
> 
> 
> 
> 

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Re: [fpc-devel] ARM/AARCH64 work

[J. Gareth Moreton]

Is there a particular DB test project that I can pick from, or is making a 
bare-bones project with 
"uses db;" enough?

Gareth aka. Kit


On Thu 06/08/20 22:46 , "Sven Barth" pascaldra...@googlemail.com sent:
> J. Gareth Moreton  schrieb am Do., 6. Aug. 2020, 22:36:
> Hi guys, can you confirm that Lazarus compiles on aarch64?  When I try
> under aarch64-linux (with 
> fresh SVN checkouts), it fails with the error message:
> 
> Fatal: (10022) Can't find unit db used by fcllaz
> 
> Can you compile a simple program that uses the DB unit? If not, then your
> FPC is configured incorrectly. If you can, then... Uhm... We'll have to
> check further...
> Regards, Sven 
> 

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Re: [fpc-devel] ARM/AARCH64 work

[Sven Barth via fpc-devel]

J. Gareth Moreton  schrieb am Do., 6. Aug. 2020,
22:36:

> Hi guys, can you confirm that Lazarus compiles on aarch64?  When I try
> under aarch64-linux (with
> fresh SVN checkouts), it fails with the error message:
>
> Fatal: (10022) Can't find unit db used by fcllaz
>

Can you compile a simple program that uses the DB unit? If not, then your
FPC is configured incorrectly. If you can, then... Uhm... We'll have to
check further...

Regards,
Sven
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Re: [fpc-devel] ARM/AARCH64 work

[J. Gareth Moreton]

Hi guys, can you confirm that Lazarus compiles on aarch64?  When I try under 
aarch64-linux (with 
fresh SVN checkouts), it fails with the error message:

Fatal: (10022) Can't find unit db used by fcllaz

Last time this was mentioned, it was due to an oversight on my part when it 
comes to case block 
improvements.  Sven hinted at problems with this with aarch64-win64, but I 
can't remember the details 
on what I did wrong or what's failing exactly (my large benchmark/test, 
tests/bench/bcase.pp, doesn't 
show any failures).

Old topic (and link to relevant bug report): 
https://forum.lazarus.freepascal.org/index.php?
topic=43730.0

Gareth aka. Kit
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Re: [fpc-devel] ARM/AARCH64 work

[Marc Weustink via fpc-devel]

On 6-8-2020 11:16, Sven Barth via fpc-devel wrote:
Marc Weustink via fpc-devel > schrieb am Do., 6. Aug. 2020, 
09:13:





...



Do you mind sharing where you found a working network driver ? I've
read
endless stories of instabilities with a few possible links to solutions
of a few months old.
  From all that I got the impression that building myself would be the
"quickest" way to get them.


When I had setup the machine I had given up on that and simply used an 
Asix based USB-LAN Adapter and passed that through to the VM.


Didn't try that one yet. I should have one somewhere.

Though I had recently read, that now support for the network driver 
should be working. You should be able to get the latest drivers from the 
Redhat site, I think. I'll have to check that again.


Yes, it a bit confusing. If you read the fedora site you may get the 
impression it supports only x86 or amd64. Today I downloaded the iso and 
the arm64 driver folders are present. I need to check if they work


Thanks Marc
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Re: [fpc-devel] ARM/AARCH64 work

[Sven Barth via fpc-devel]

Marc Weustink via fpc-devel  schrieb am
Do., 6. Aug. 2020, 09:13:

>
>
> On 5-8-2020 23:44, Sven Barth via fpc-devel wrote:
> > Am 05.08.2020 um 18:33 schrieb J. Gareth Moreton:
> >> P.S. While I haven't been asked to improve aarch64-linux specifically,
> >> if I'm understanding things
> >> correctly, there should be very few differences with the actual target
> >> platform in regards to
> >> calling conventions, for example.
> > Correct, the most is equal between the platform. There are only subtle
> > differences like this one for AArch64-Win64:
> >
> https://svn.freepascal.org/cgi-bin/viewvc.cgi/trunk/compiler/aarch64/ncpuset.pas?r1=44949=44948=44949
> >
> >
> > If you want, you could also install a Windows 10 On ARM64 inside a KVM
> > on your Raspberry (with the correct guest drivers you'll get near native
> > performance) like I have done and test around on that as well ;) Maybe
> > you'll find the necessary time earlier than me to fix the remaining
> > problems of the compiler not being able to cycle itself there... :/
>
> Do you mind sharing where you found a working network driver ? I've read
> endless stories of instabilities with a few possible links to solutions
> of a few months old.
>  From all that I got the impression that building myself would be the
> "quickest" way to get them.
>

When I had setup the machine I had given up on that and simply used an Asix
based USB-LAN Adapter and passed that through to the VM.
Though I had recently read, that now support for the network driver should
be working. You should be able to get the latest drivers from the Redhat
site, I think. I'll have to check that again.

Regards,
Sven

>
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Re: [fpc-devel] ARM/AARCH64 work

[Marc Weustink via fpc-devel]

On 5-8-2020 23:44, Sven Barth via fpc-devel wrote:

Am 05.08.2020 um 18:33 schrieb J. Gareth Moreton:
P.S. While I haven't been asked to improve aarch64-linux specifically, 
if I'm understanding things
correctly, there should be very few differences with the actual target 
platform in regards to

calling conventions, for example.
Correct, the most is equal between the platform. There are only subtle 
differences like this one for AArch64-Win64: 
https://svn.freepascal.org/cgi-bin/viewvc.cgi/trunk/compiler/aarch64/ncpuset.pas?r1=44949=44948=44949 



If you want, you could also install a Windows 10 On ARM64 inside a KVM 
on your Raspberry (with the correct guest drivers you'll get near native 
performance) like I have done and test around on that as well ;) Maybe 
you'll find the necessary time earlier than me to fix the remaining 
problems of the compiler not being able to cycle itself there... :/


Do you mind sharing where you found a working network driver ? I've read 
endless stories of instabilities with a few possible links to solutions 
of a few months old.
From all that I got the impression that building myself would be the 
"quickest" way to get them.


Thanks,
Marc
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Re: [fpc-devel] ARM/AARCH64 work

[Florian Klämpfl]

> Am 05.08.2020 um 19:47 schrieb J. Gareth Moreton :
> 
> Hi everyone,
> 
> So I have been asked to do some work in improving optimisation for AARCH64, 
> and ARM by logical 
> extension since some parts are shared.  I've had a look around the code for 
> the Peephole Optimizer 
> for these platforms, and while I've found some potential improvements to 
> generated code, my first 
> desire is to break up the monolithic optimisation functions (e.g. 
> "PeepHoleOptPass1Cpu"), since some 
> of them are well over 1,000 lines long and incredibly unwieldy.  
> 
> The plan for this is simple... each opcode or set of similar opcodes will get 
> its own function 
> similar to how it is done on x86 platforms (e.g. "OptPass1STR" for STR 
> optimisations).  This will 
> make the code much more compartmentalised and easier to maintain.  There are 
> some exceptions to this 
> rule but I'm managing them easily enough.
> 
> Additionally, at a later stage, I want each platform to be able to share the 
> DebugMsg method and the 
> SPeepholeOptimization string, since currently a lot of platforms redeclare 
> DebugMsg but without 
> actually changing anything in the implementation.
> 
> Obviously I'll submit the changes as patches so they can be properly reviewed 
> and tested, but does 
> this sound like a good idea?

Yes, you might have seen, that I started already with this some time ago.

> 
> Gareth aka. Kit
> 
> P.S. While I haven't been asked to improve aarch64-linux specifically, if I'm 
> understanding things 
> correctly, there should be very few differences with the actual target 
> platform in regards to 
> calling conventions, for example.

You mean with regard to different aarch64 platforms?

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Re: [fpc-devel] ARM/AARCH64 work

[Sven Barth via fpc-devel]

Am 05.08.2020 um 22:44 schrieb J. Gareth Moreton:

I can't promise anything just yet, but I'll see what I can do.

At the moment I'm still learning to configure anything.  I've had apps crash 
from out of memory
errors and the CPU get throttled due to overheating while trying to play a 
YouTube video.  I've got
some things sorted by increasing the size of the swap file.  Frankly I want my 
laptop back so I can
get a proper e-mail client again, since I can't quite remember the server 
details off-hand and the
Webmail client causes problems with indenting in the fpc-devel mailing list, as 
you undoubtedly
remember.


Can't you check what you need from the webclient? After all at least 
your username and password should be the same no matter if you access 
through the web interface or IMAP...



When you say Windows 10 on ARM64, do you mean an actual build for ARM 
processors or an x86_64
version running inside a virtual machine?  Presumably I'll have to buy a copy 
of the OS for that, so
it will have to wait for a little bit if that's the case.  But hey, I'm all for 
cross-platform
development.
Yes, a Windows build for ARM64 processors. I've recently done the port 
for FPC for that. :)
Well, whether you have to buy a copy I can't answer with finality yet, 
but you can download the necessary files from Microsoft (no matter the 
architecture) and at least the "nag screen" that it isn't licensed 
hasn't appeared yet. So in the worst case you'll simply have to 
reinstall it every few months to keep using the evaluation version...


Regards,
Sven
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Re: [fpc-devel] ARM/AARCH64 work

[J. Gareth Moreton]

I can't promise anything just yet, but I'll see what I can do.

At the moment I'm still learning to configure anything.  I've had apps crash 
from out of memory 
errors and the CPU get throttled due to overheating while trying to play a 
YouTube video.  I've got 
some things sorted by increasing the size of the swap file.  Frankly I want my 
laptop back so I can 
get a proper e-mail client again, since I can't quite remember the server 
details off-hand and the 
Webmail client causes problems with indenting in the fpc-devel mailing list, as 
you undoubtedly 
remember.

When you say Windows 10 on ARM64, do you mean an actual build for ARM 
processors or an x86_64 
version running inside a virtual machine?  Presumably I'll have to buy a copy 
of the OS for that, so 
it will have to wait for a little bit if that's the case.  But hey, I'm all for 
cross-platform 
development.

Gareth aka. Kit

On Wed 05/08/20 22:44 , "Sven Barth via fpc-devel" 
fpc-devel@lists.freepascal.org sent:
> Am 05.08.2020 um 18:33 schrieb J. Gareth Moreton:
> 
> > P.S. While I haven't been asked to improve
> aarch64-linux specifically, if I'm understanding things
> > correctly, there should be very few differences
> with the actual target platform in regards to
> > calling conventions, for example.
> 
> Correct, the most is equal between the platform. There are only subtle 
> 
> differences like this one for AArch64-Win64: 
> 
> https://svn.freepascal.org/cgi-bin/viewvc.cgi/trunk/compiler/aa
> rch64/ncpuset.pas?r1=44949=44948=44949
> 
> 
> If you want, you could also install a Windows 10 On ARM64 inside a KVM 
> 
> on your Raspberry (with the correct guest drivers you'll get near native 
> 
> performance) like I have done and test around on that as well ;) Maybe 
> 
> you'll find the necessary time earlier than me to fix the remaining 
> 
> problems of the compiler not being able to cycle itself there... :/
> 
> 
> 
> Regards,
> 
> Sven
> 
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> 
> 
> 
> 
> 

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Re: [fpc-devel] ARM/AARCH64 work

[Sven Barth via fpc-devel]

Am 05.08.2020 um 18:33 schrieb J. Gareth Moreton:

P.S. While I haven't been asked to improve aarch64-linux specifically, if I'm 
understanding things
correctly, there should be very few differences with the actual target platform 
in regards to
calling conventions, for example.
Correct, the most is equal between the platform. There are only subtle 
differences like this one for AArch64-Win64: 
https://svn.freepascal.org/cgi-bin/viewvc.cgi/trunk/compiler/aarch64/ncpuset.pas?r1=44949=44948=44949


If you want, you could also install a Windows 10 On ARM64 inside a KVM 
on your Raspberry (with the correct guest drivers you'll get near native 
performance) like I have done and test around on that as well ;) Maybe 
you'll find the necessary time earlier than me to fix the remaining 
problems of the compiler not being able to cycle itself there... :/


Regards,
Sven
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