DMD is faster than LDC and GDC

[rsw0x via Digitalmars-d]

On Thursday, 12 November 2015 at 21:16:25 UTC, Walter Bright 
wrote:
> On 11/12/2015 6:44 AM, John Colvin wrote:
>> dmd is being clever and spotting that fmttable is pure, it 
>> would be good if
>> ldc/gdc could spot this to.
>
> It's more than that - dmd's optimizer is designed to make use 
> of the guarantees of a pure function. Since C/C++ do not have 
> pure functions, ldc/gdc's optimizer may not have that 
> capability.

gcc has had the pure function attribute since version 2.96 in 
2000.