2015-06-24 18:19 GMT+02:00 Ben Wolfson <wolf...@gmail.com>: > > I meant a difference in speed. > > A var-root fetch is a volatile read, which can have several adverse performance effects. Most importantly, it hinders inlining, since the JIT has to place a guard for every inlining site of a volatile read, thus it won't so readily inline. Even when inlined, there must be a memory barrier for the guard, which can lead to pipeline flushes, bus communication and other stalls in execution.
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