DMD floating point performance.

[Don Clugston]

Walter Bright wrote:
> Dave wrote:
>> I know this is simplistic, but could something like fxch be used to 
>> 'mimick' a register machine as vars are stored into registers? fxch is 
>> supposed to be very efficient.
> 
> Yes, I just haven't done the work to figure it out.

The definitive article on this is Agner Fog's optimisation manual at 
www.agner.org. It's fantastically difficult to do x87 perfectly (and 
this is probably the main appeal of SSE), but I'm sure there are massive 
gains to be had relatively cheaply.