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...ning. You really should be specific here. The optimizations you're thinking of may be uninteresting to many clients. Also you won't lose any performance if your GC pointers are also needed for deopt (which happens to be the common case). I really do think that this whole discussion is tragicomic. Most clients of LLVM would be best served with mostly copying GC. -Filip > Instead, you probably want to consider something like the late safepoint placement approach we've been pushing. Hopefully, once the statepoint stuff lands, we can get that upstreamed fairly soon. > >...

With the patchpoint infrastructure, shouldn't it now be relatively straightforward to do an accurate-but-non-relocatable scan of the stack, by attaching all the GC roots as stackmap arguments to patchpoints? This is something we're currently working on for Pyston (ie we don't have it working yet), but I think we might get it "for free" once we finish the work on frame