dmd codegen improvements

[Walter Bright via Digitalmars-d]

On 8/18/2015 2:32 PM, Joseph Rushton Wakeling wrote:
> However true that may be in general, those almost certainly aren't the reasons
> why ddmd benchmarks 30% slower than dmd.  I would suspect that particular speed
> difference is heavily backend-dependent.

That's exactly why I started this thread. To find out why, and if there are low 
cost steps we can take to close that gap.