Bug#102193: gcc-3.0: compiled code with gcc 3.0 is slow and big

[Morten Brix Pedersen <morten@wtf.dk>]

Package: gcc-3.0
Version: 1:3.0.3-1

I don't know if it's valid for this bug report, but all code I have tried is
slower in g++ 3, here's a simple example:

(numbers first, code in the bottom)
mbp:~$ g++ benchmark.cpp ; ls -l a.out ; time a.out ; g++-3.0 benchmark.cpp
; ls -l a.out ; time a.out
-rwxr-xr-x    1 mbp      mbp         42840  5 jan 02:14 a.out*

real    0m13.542s
user    0m6.200s
sys     0m0.220s
-rwxr-xr-x    1 mbp      mbp         38016  5 jan 02:14 a.out*

real    0m20.882s
user    0m9.950s
sys     0m0.080s


The first one is g++ 2.95.4 and the second is g++ 3.0.3.

This is the code:

#include <string>
#include <vector>
#include <algorithm>

using std::string;
using std::vector;

int main()
{
    string test = "IUHASISAHDNI";

    vector<string> vec;
    for (int i = 0; i <= 500000; ++i) {
        string newstr;
        test += "NAWNASDKJNKNN";
        newstr = test;
        string::size_type pos = newstr.find("NAW");
        test = newstr.substr(pos, 3);
        newstr = test;
        newstr.append("HASDASNDJKANKDJNASDJAKNDKJASNDKSAND");
        vec.push_back(newstr);
        vec.push_back(test);
    }

    vector<string> newvec;
    std::copy(vec.begin(), vec.end(), back_inserter(newvec));

}




-- System Information
Debian Release: 3.0
Architecture: i386
Kernel: Linux kolon 2.4.17 #1 man dec 24 13:52:51 CET 2001 i686
Locale: LANG=da_DK, LC_CTYPE=da_DK

Versions of packages gcc-3.0 depends on:
ii  binutils                2.11.92.0.12.3-4 The GNU assembler, linker and bina
ii  cpp-3.0                 1:3.0.3-1        The GNU C preprocessor.
ii  gcc-3.0-base            1:3.0.3-1        The GNU Compiler Collection (base 
ii  libc6                   2.2.4-7          GNU C Library: Shared libraries an
ii  libgcc1                 1:3.0.3-1        GCC support library.