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

[Anthony DeRobertis <asd@suespammers.org>]

On Friday, January 4, 2002, at 08:17 , Morten Brix Pedersen wrote:

> mbp:~$ g++ benchmark.cpp ; ls -l a.out ; time a.out ; g++-3.0 
> benchmark.cpp
> ; ls -l a.out ; time a.out
Well, first, take . out of your path! I get:

-rwxr-xr-x    1 anthony  anthony     42840 Jan  5 23:46 a.out

real    0m7.870s
user    0m7.210s
sys     0m0.490s
-rwxr-xr-x    1 anthony  anthony     37976 Jan  5 23:47 a.out

real    0m13.835s
user    0m13.240s
sys     0m0.420s

Ouch! Turning on the optimizer does help some, though:

anthony@bohr:morten$ g++ -O3 -march=i686 benchmark.cpp ; ls -l 
a.out ; time ./a.out ; g++-3.0 -O3 -march=i686 benchmark.cpp; ls 
-l a.out; time ./a.out
-rwxr-xr-x    1 anthony  anthony     19173 Jan  5 23:50 a.out

real    0m3.146s
user    0m2.640s
sys     0m0.470s
-rwxr-xr-x    1 anthony  anthony     19109 Jan  5 23:51 a.out

real    0m4.617s
user    0m4.130s
sys     0m0.410s
anthony@bohr:morten$

Now only 1/3 slower. Still not good.