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...to give a developer his own virtual domain to sandbox his application development without having to dedicate a whole piece of hardware to just him. But I know he won''t really log in and use it all that often. If I give him 512M of my 2G that''s 25% of my memory that will likely be unutilized most of the time. It would be great if I could assign more memory to domains than I actually have and just let it swap out idle pages. I bet there are a lot of boxes out there, especially in webserver colo''s, that really don''t get much traffic and really don''t need as...

...n't work. Thirdly, it's been suggested to use a peephole pass and to look at AArch64LoadStoreOptimizer.cpp. This also doesn't work for pretty much the same reason. Moreover, this is after register allocation so even for the limited situations where it can work, it leaves allocated but unutilized registers. Doesn't work. In fact, I'd suggest the Arm backend adopt my approach. So firstly, I think the best way to solve this problem is to avoid this problem in the first place. Just don't hoist these values. For the X86 backend, X86TTI::getIntImmCost() in X86TargetTransformInf...