Proto for Boost mailing list page: Re: [proto] proto performance

Subject: Re: [proto] proto performance
From: Karsten Ahnert (karsten.ahnert_at_[hidden])
Date: 2011-02-20 06:31:42

On 02/20/2011 12:08 PM, Joel Falcou wrote:
> On 20/02/11 12:03, Karsten Ahnert wrote:
>> On 02/20/2011 12:02 PM, Joel Falcou wrote:
>>> On 20/02/11 11:55, Karsten Ahnert wrote:
>>>> On 02/20/2011 11:57 AM, Eric Niebler wrote:
>>>> It gcc 4.4 on a 64bit machine. Of course, I compile with -O3.
>>>>
>>> Ding! welcome to gcc-4.4 64bits compiler hellfest.
>>> Try 4.5, 4.4 64bits can't inlien for w/e reason.
>> Great, I tried with gcc 4.5 and the proto part is now around 5-10
>> percents faster. Thank you.
> 
> We banged our heads for weeks on this issue earlier until we found some
> dubious bug report in gcc bugzilla flagged as nofix :/
> Seems the 4.5 branch solved it somehow.

It is amazing that the proto expression is faster then the naive one.
The compiler must really love the way proto evaluates an expression.

> 
> You cna also try compiling with 4.4 using -m32
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