Speed kills

[Guillaume Piolat via Digitalmars-d]

On Monday, 15 February 2016 at 13:51:38 UTC, ixid wrote:
> This is the most recent one where John Colvin provided some 
> pointers to speed it up significantly. Walter has done some 
> good work taking the low-hanging fruit to speed up DMD code and 
> there is a lot of effort going on with reference counting 
> machinery but I wondered if some of the common errors people 
> make that slow down D code can be addressed?

Something that annoyed me a bit is floating-point comparisons, 
DMD does not seem to be able to handle them from SSE registers, 
it will convert to FPU and do the comparison there IIRC.