[cfe-dev] speed of clang++

Rafael Espindola espindola at google.com
Sun Jan 24 21:22:03 CST 2010


> ivan at ivan-desktop:~/d/llvm-build/Release/bin$ time ./clang++ 1.cpp
>
> real    0m1.450s
> user    0m1.300s
> sys     0m0.130s
>
> ivan at ivan-desktop:~/d/llvm-build/Release/bin$ ./a.out
> 8191
> ivan at ivan-desktop:~/d/llvm-build/Release/bin$ time g++ 1.cpp
>
> real    1m8.859s
> user    1m8.520s
> sys     0m0.170s

GCC 4.5 is faster, but clang still wins. With -S to test just the compiler:

$ time ~/llvm/llvm-build/Release/bin/clang++ -S
/home/espindola/gcc/test.cc  -o t.s

real	0m0.530s
user	0m0.490s
sys	0m0.030s

$ time ~/gcc/inst-x86/bin/g++ -S /home/espindola/gcc/test.cc  -o t.s

real	0m1.107s
user	0m1.080s
sys	0m0.030s

Not that 2.09x faster is bad :-)

Cheers,
-- 
Rafael Ávila de Espíndola



More information about the cfe-dev mailing list