DConf 2014 Keynote: High Performance Code Using D by Walter Bright

[John Colvin via Digitalmars-d-announce]

On Friday, 18 July 2014 at 04:40:52 UTC, dennis luehring wrote:
> Am 18.07.2014 04:52, schrieb Walter Bright:
>> On 7/16/2014 7:21 AM, dennis luehring wrote:
>>> can you give an short (working) example code to show the 
>>> different resulting
>>> assembler for your for-rewrite example - and what compilers 
>>> your using for
>>> testing - only dmd or gdc?
>>
>> I used dmd.
>>
>
> i sometimes got the feeling that you underestimate the sheer 
> power of todays clang or gcc optimizers - so partly what 
> gdc/ldc can do with your code
>
> reminds me of brian schotts exmaple of his sse2 optimized 
> version of his lexer - the dmd generated was much faster then 
> the normal version, but gdc/ldc results of the unoptimized 
> versions are still 50% faster
>
> i understand your focus on dmd - but talking about fast code 
> and optimizing WITHOUT even trying to compare with other 
> compiler results is just a little bit strange for someone who 
> stated speed = money

I think this somewhat misses the point of the example, which I 
would say was - in academia-speak - purely illustrative.

The point still stands, which is "unless you understand the 
compiler and the architecture, stop trying to second guess 
performance on the micro-level"