I noticed in the file heuristic_binning.h, there's a type PrimInfo, whose c'tor accepts BBox3f by value, this will invoke a copy c'tor, but BBox3f has alignment inherited via Vec3f<float>. This shoud trigger and error with the MS compiler (error C2719), but it actully does not. Anyone care to explain why? Disabled somehow?
Using the MS compiler values passed by value will not be properly aligned. As a workaround one has to pass all values by reference that need alignment. I fixed that bug in the git repository of Embree, check it out here embree.github.com