On Fri, 2008-07-25 at 00:55 +1000, Adelle Hartley wrote:
> if (SelectedCustomer.HasValue && SelectedCustomer.Country.HasValue &&
> SelectedCustomer.Country.Currency.HasValue &&
> SelectedCustomer.Country.Currency.ExchangeRate.HasValue)
> {
> // ... Do something with SelectedCustomer.Country.Currency.ExchangeRate
> }
>
Now this IS a place where optimisation is possible. I reduced 25%
runtime of a program to almost zero by getting rid of multiple
dereferences like this.
It was a data rip of a page and everything was stored in struct which
contained arrays containing more structs. I cached a couple of the
dereferences at the top and the whole subroutine dropped off the
profiler. I had a huge gain I was not expecting. This is why we profile
rather than blindly changing things, if it made things worse then I
would have unwound the change.
Ken
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