Poor Performance gdc11 for base 64 with O3

[max haughton]

On Sunday, 19 September 2021 at 19:04:28 UTC, Mahdi wrote:
> In optimization level 3, gdc11 doesn't seem to work as well as  
> gdc10 for base 64 benchmark.
> On this site:
> https://github.com/kostya/benchmarks#base64
>
> [...]

It's because of libphobos not being compiled with inlining due to 
the changes to template linkage emission. If you rebuild Phobos 
with LTO enabled (if it isn't already) you can get your 
performance back.

Compile with LTO and try that.