On Tue, Apr 28, 2009 at 10:21 AM, nathan binkert <n...@binkert.org> wrote:
> Realistically, I don't see it being more complicated since you'd just > be replacing traceData with foo->traceData. Efficiency is > questionable as well since that traceData had to come from somewhere. I think the difference is that passing it in explicitly means that you could keep it in a register for the duration of the function, and if you can put it in a callee-save then maybe you could save a few dereferences. In contrast the indirection would have to be repeated after every function call (which is exactly the behavior we'd be relying on here). > Futhermore, the traceData parameter has to be provided even in m5.fast > which means we pay extra then. That's a good point; it's probably worth paying the (at best negligible, possibly illusory) penalty in the debug versions to avoid this unnecessary overhead in m5.fast. > Steve, do you have any idea why this > happened? My guess is that it's just historical and that traceData > came from somewhere else at some point. Yea, I believe it's just historical. Steve
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