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"

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