[m-rev.] for review: put almost all layout structures in arrays

[Paul Bone]

On Thu, Oct 29, 2009 at 11:50:23AM +1100, Zoltan Somogyi wrote:
> On 29-Oct-2009, Paul Bone <pbone at csse.unimelb.edu.au> wrote:
> > Do we know if this effects execution speed?  It may change locality of
> > reference.  I can't say if I expect to see an improvement, a loss or no
> > change, caching effects are hard to predict :-).
> 
> This change does not affect what instruction sequence gets executed either
> in non-debug grades, or in debug grades outside the debugger. The data
> structures it changes are consulted only when the debugger has either stopped
> for user interaction, or is considering stopping by evaluating the condition
> on a conditional breakpoint.
> 
> There may be cache effects due to the code being executed being moved around,
> but those effects can be ignored, because they average out in the long term.
> 

This makes sense.

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