[fpc-devel] Might need some help with this one

[J. Gareth Moreton]

I got a fix.

https://bugs.freepascal.org/view.php?id=38129

It's not perfect because CSE becomes less efficient, but it appears to 
fix the bug.  Someone with more knowledge of this part of the compiler 
might be able to improve on it in the future. x86_64-win64 and 
aarch64-linux tests all pass.  I'm not yet sure if it fixes the -O2 bugs 
reported on aarch64 specifically - those will have to be tested when 
this fix (or another one) goes live.

Gareth aka. Kit

On 27/11/2020 19:47, J. Gareth Moreton via fpc-devel wrote:
>
> Crumbs, this minor aside has blown up more than the original problem!
>
> To get back on topic, it seems there's a bug with one of the node code 
> generators under -O2 and above.  It's not something I've researched 
> that deeply, but I would like to see it fixed. First though we need to 
> find which node is malfunctioning.
>
> Gareth aka. Kit
>
> On 27/11/2020 19:43, Alexander Grotewohl via fpc-devel wrote:
>> "break" is a windows built-in. explains the first attempt.
>>
>> --
>> Alexander Grotewohl
>> https://dcclost.com <https://dcclost.com>
>> ------------------------------------------------------------------------
>> *From:* fpc-devel <fpc-devel-bounces at lists.freepascal.org> on behalf 
>> of Tomas Hajny via fpc-devel <fpc-devel at lists.freepascal.org>
>> *Sent:* Friday, November 27, 2020 11:16:26 AM
>> *To:* FPC developers' list <fpc-devel at lists.freepascal.org>
>> *Cc:* Tomas Hajny <XHajT03 at hajny.biz>
>> *Subject:* Re: [fpc-devel] Might need some help with this one
>> On 2020-11-27 15:34, Bart via fpc-devel wrote:
>> > On Thu, Nov 26, 2020 at 11:10 PM Tomas Hajny via fpc-devel
>> > <fpc-devel at lists.freepascal.org> wrote:
>> >
>> >> Typing 'break.exe' in cmd.exe _does_ make a difference here (it
>> >> executes
>> >> as expected unlike when typing just 'break'). And obviously running
>> >> break.exe using some other 'shell' (e.g. your preferred OFM ;-) )
>> >> works
>> >> as well.
>> >
>> > Well, at my machine it did not.
>> > I also called it from a batchfile (as break.exe) to see if I could
>> > catch the errorlevel (I let it crash with a division by zero).
>> > The errorlevel is set, but absolutely no output to screen or pipe.
>>
>> Understood. Haven't I already mentioned something about MS approach
>> towards compatibility here recently? :/
>>
>> -------------------
>> D:\TEMP>cmd
>> Microsoft Windows [Version 10.0.18363.1082]
>> (c) 2019 Microsoft Corporation. Všechna práva vyhrazena.
>>
>> D:\TEMP>break
>>
>> D:\TEMP>break.exe
>> I am Break
>>
>> D:\TEMP>.\break
>> I am Break
>>
>> D:\TEMP>
>> ===================
>>
>> Tomas
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