instruction timings / optimization ?
emmanuel.castro at laposte.net
Sat Sep 19 11:00:35 PDT 2009
Is there a not too complicated way to get the x86 (or other processor)
instructions produced by the JVM?
Maybe there is a link to some Wiki explaining that?
2009/9/19 Charles Oliver Nutter <headius at headius.com>
> On Fri, Sep 18, 2009 at 4:52 PM, James Ladd <james_ladd at hotmail.com>
> > 1. Is there a document that details each VM instruction and the time it
> > takes in cycles on
> > a particular architecture?
> I don't think it's possible to accurately measure this information.
> The JVM bytecode is essentially an intermediate representation that
> the JVM takes and optimizes when compiling to native code. The cycles
> a given instruction takes will have little relation to the actual
> native code generated.
> > 2. Would anyone else find this information useful ?
> If it were possible to determine, yes :) But it's not.
> - Charlie
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> mlvm-dev at openjdk.java.net
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