[fpc-devel] The 15k bounty: Optimizing executable speed for Linux x86 / LLVM

Sven Barth pascaldragon at googlemail.com
Thu Oct 25 11:18:58 CEST 2018

Michael Van Canneyt <michael at freepascal.org> schrieb am Do., 25. Okt. 2018,

> On Sat, 20 Oct 2018, Simon Kissel wrote:
> > - Make Exception handling, TLS etc use the infrastructure that
> >  libpthread is providing
> TLS is handled already by libpthread. I doubt you will gain much there.
> However, Exception handling is a problem. There are 2 possible ways ahead:
> - DWARF exception handling as mentioned by Sven.
> - Port SEH to be cross platform, this is the approach as taken by Kylix.
> Kilyx has a small rtlunwind  library that mimics the needed run-time
> functionality
> offered by Windows.
> Conceivably, it can be duplicated. wine probably has such a library which
> can be used as an inspiration.
> The needed compiler infrastructure for SEH  already exists, so this is
> most likely
> the fastest way to proceed.

I'm against emulating SEH. Better implement DWARF exceptions. The
infrastructure that was created for SEH inside the compiler should help


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