Recently I have added to bug reports to LLVM (from D code compiled with ldc2), I am not fully sure they are caused by the back-end: http://llvm.org/bugs/show_bug.cgi?id=16723 http://llvm.org/bugs/show_bug.cgi?id=16726 So far I have received no answers, I don't know why. LLVM people used to answer me quickly :-) Bye, bearophile