path tracing benchmark

[bearophile]

Trass3r:

> I ported smallpt to D some time ago and now that I've working versions of  
> LDC2 and GDC2 I did a quick comparison:

I have converted to D many of the commonly found benchmarks, this is my version:
http://codepad.org/ZbmSfseY

If I compile it with with LDC1 with Link Time Optimization + Interning:
ldc -O3 -release -inline -output-bc smallpt2_d.d

opt -std-compile-opts smallpt2_d.bc > smallpt2_do.bc

llvm-ld -native -ltango-base-ldc -ltango-user-ldc -ldl -lm -lpthread -internalize-public-api-list=_Dmain -o=smallpt2_do smallpt2_do.bc

I produce a binary that's faster than the C++ version (22.7 seconds instead of 29 seconds).

Bye,
bearophile