Poor regex performance?

Jon Degenhardt jond at noreply.com
Thu Apr 4 15:30:18 UTC 2019


On Thursday, 4 April 2019 at 10:31:43 UTC, Julian wrote:
> On Thursday, 4 April 2019 at 09:57:26 UTC, rikki cattermole 
> wrote:
>> If you need performance use ldc not dmd (assumed).
>>
>> LLVM has many factors better code optimizes than dmd does.
>
> Thanks! I already had dmd installed from a brief look at D a 
> long
> time ago, so I missed the details at 
> https://dlang.org/download.html
>
> ldc2 -O3 does a lot better, but the result is still 30x slower
> without PCRE.

Try:
     ldc2 -O3 -release -flto=thin 
-defaultlib=phobos2-ldc-lto,druntime-ldc-lto -enable-inlining

This will improve inlining and optimization across the runtime 
library boundaries. This can help in certain types of code.


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