Dhrystone speed dmd vs gdc

[Manfred Nowak]

downs wrote

> I just ran the samples/dhry.d

Warning! That is a sample only!

I remember tests of my own with similar results. But on more careful 
analysis it turned out, that dhry.d seems to be unusable as a 
benchmark.

AFAIR this was due to some function f() which converges to the value 
1.0. GCC's math library allowed that function to reach 1.0, whereas DMD 
let it stay at 1.0-epsilon.

I did not analyse that any further because I am at no means an expert 
in benchmarking and in addition do not want to explore that field.

My impression was though, that because f() was used in some 
multiplication GCC may have made itself an unfair advantage: 
multiplication with 1.0 seems to be much easier (and therefore faster!)
than multiplication with 1.0-epsilon.

-manfred