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
Regards from Switzerland
MAC
