Re: [boost] [offtopic] C++11 useful trick

Subject: Re: [boost] [offtopic] C++11 useful trick
From: Roland Bock (rbock_at_[hidden])
Date: 2012-07-03 12:22:11

On 2012-07-03 16:52, Mathias Gaunard wrote:
>
> Given your test, I suggest you benchmark the preprocessed output
> rather than the source directly.

OK, created preprocessed versions with clang -E and measured again, but
the results are similarly close (and way too much under the influence of
the sheer amount of bytes that need to be processed).

I came up with a new test, see attachments:

Without optimization:
Eric:
real    0m11.457s
user    0m11.080s
sys     0m0.330s

Roland:
real    0m11.228s
user    0m10.790s
sys     0m0.400s

With -O3:
Eric:
real    0m2.910s
user    0m2.730s
sys     0m0.150s

Roland:
real    0m2.867s
user    0m2.680s
sys     0m0.160s

Interestingly enough, Eric's version takes a bit longer to compile on my
machine:

clang version 3.2 (trunk 155315)
Target: x86_64-unknown-linux-gnu

And clang crashes when I add another row of parameters in Eric's
version. No problems with my version...

Can somebody try with a different compiler? Or is this test complete
nonsense for some reason?

Regards,

Roland