On Thu, Feb 25, 2010 at 3:35 PM, <cmauc...@hsr.ch> wrote:
> Hellow gcc,
>
> i'm working on the topic "overhead and codesize in C and C++". The goal of
> this work is to find out, why C++ is not as fast as normal C code (in same
> application).
>
> But already by the beginning we found out something very interesting.
>
> The Code:
> int main(int argc, char *argv[])
> {
> return 0;
> }
> No function so far. But this compiled with gcc and g++ (on Linux Redhead EL5,
> Intel Xeon 5130 (x86_64))
>
> Codesize in C: 7820
> Codesize in C++: 8175
>
> But much more interesting is the number of instructions (mesured with
> callgrind/kcachegrind):
> For main:
> Ir in C: 7
> Ir in C++: 7
> Whole program (you see, there is no include)
> Ir in C: 80 158 (a lot)
> Ir in C++: 1 295 980 (massive!!)
>
> C++ has a mulitple of C-Instructions. Why is that such enorm?
>
> Is there any idea or better documenation about this topic? Thank you for your
> answer
The least you should do before anyone can answer this, is tell us what
compiler options you used.
Ciao!
Steven
