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...l go ahead and commit to it over the next few days. > Done, and in progress. SHould have the loop alignment stuff cloned right away, and then i'll start looking at the loop structure issues. I'll probably have some questions for you and/or andy about exactly how that should work, whether CodePlacementOpt is doing the right thing, etc. Your work looks good and there's talk of making this the default layout pass. So let's figure out the goals and requirements. We agree that preserving "structure" of the CFG is important in the absence of profile information to the contrary....

...feature additions we've talked about here. I'm fine either way, so its really what makes things easier on your end. I'll definitely want review on all of it as some of this (especially the loop structure issues) is still a bit new to me. =D At least some of it (the loop alignment from CodePlacementOpt) is obvious how to port across, but I'm sure there will be more tricky elements around the loop structures. Could you rename it to MachineBlockPlacement.cpp first, though? That makes > it clear it's a CodeGen pass, and the BlockPlacement2 name is icky. > Yea, the 2 thing was...