[fpc-devel] Rules about record types and internal storage

J. Gareth Moreton gareth at moreton-family.com
Fri Apr 3 01:10:57 CEST 2020

Agreed.  Sometimes it is a question of how much should be left to the 
compiler and how much should be left to the programmer when it comes to 

Gareth aka. Kit

On 02/04/2020 23:42, Sven Barth via fpc-devel wrote:
> J. Gareth Moreton <gareth at moreton-family.com 
> <mailto:gareth at moreton-family.com>> schrieb am Do., 2. Apr. 2020, 22:33:
>     Hi Jonas,
>     I brought that up because Florian once asked about just doing
>     everything
>     as vectorcall on Win64 because the calling convention, by and
>     large, is
>     a compatible extension to its default one.  I think issues of
>     compatibility and third-party interfacing makes it not the best idea
>     unless there's a way to override it (which you can do by
>     specifying the
>     'ms_abi_default' directive, even though that's not the nicest name to
>     remember!)
> I don't think it's a good idea to change the default calling 
> convention. We'll get many bug reports about third party libraries 
> then even if it can be changed. The potential performance gain is not 
> worth it. And those that want to really optimize their code can do so 
> by adjusting the calling convention either per function or using 
> $calling.
> Regards,
> Sven
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