DMD is faster than LDC and GDC

[tired_eyes via Digitalmars-d]

On Thursday, 12 November 2015 at 14:44:49 UTC, John Colvin wrote:
>
> To test the speed of fmttable itself I split fmttable and main 
> in to different modules, made fmttable extern(C) so I could 
> just prototype it in the main module (no import), then compiled 
> them separately before linking. This should prevent any 
> possible inlining/purity cleverness. ~1s for ldmd2, ~2s for 
> dmd, which is business as normal.
>
> dmd is being clever and spotting that fmttable is pure, it 
> would be good if ldc/gdc could spot this to.

If so, should explicitly marking fmttable as pure close the gap 
for initial code?