GDC review process.

[Manu]

On 20 June 2012 17:15, Don Clugston <dac at nospam.com> wrote:

> On 20/06/12 13:22, Manu wrote:
>
>> I find optimisers are very good at code simplification, assuming that
>
> you massage the code/expressions to neatly match any architectural quirks.
>> I also appreciate that good x86 code is possibly the hardest
>> architecture for an optimiser to get right...
>>
>
> Optimizers improved enormously during the 80's and 90's, but the rate of
> improvement seems to have slowed.
>
> With x86, out-of-order execution has made it very easy to get reasonably
> good code, and much harder to achieve perfection. Still, Core i7 is much
> easier than Core2, since Intel removed one of the most complicated
> bottlenecks (on core2 and earlier there is a max 3 reads per cycle, of
> registers you haven't written to in the previous 3 cycles).
>

Yeah okay, I can easily imagine the complexity for an x86 codegen.
RISC architectures are so much more predictable.

How do you define 'perfection'? Performance as measured on what particular
machine? :)
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.puremagic.com/pipermail/digitalmars-d/attachments/20120620/5735abd0/attachment-0001.html>