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As the VM the PPC port is derived from is targeted to long running server applications, it utilizes the optimizing C2 compiler, assuming most code is compiled at some point making interpreter performance irrelevant.To simplify porting it uses the C interpreter. Still, to get maximal performance, it supports many optimizations implemented in HotSpot, as compressed oops and biased locking. Therefore we extended the C interpreter to support these.
Compressed Oops
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The compressed oops optimization reduces Java heap requirements by compressing object references.
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