GCC 4.8 vs Clang 4.2

# clang -v
FreeBSD clang version 3.2 (trunk 162107) 20120817

# gcc48 -v
gcc version 4.8.0 20121014 (experimental) (FreeBSD Ports Collection)

# sysctl -a | egrep -i 'hw.machine|hw.model|hw.ncpu'
hw.machine: amd64
hw.model: Intel(R) Xeon(R) CPU           L3426  @ 1.87GHz
hw.ncpu: 8
hw.machine_arch: amd64

# ./bench.sh
time ./gcc/prim-native-gcc
       20,28 real        19,04 user         0,07 sys
time ./gcc/prim-native-gcc-O2
        4,83 real         4,51 user         0,02 sys
time ./gcc/prim-native-gcc-O3
        4,79 real         4,52 user         0,02 sys
time ./gcc/prim-nocona-gcc
       16,97 real        15,95 user         0,03 sys
time ./gcc/prim-nocona-gcc-O2
        5,18 real         4,67 user         0,03 sys
time ./gcc/prim-nocona-gcc-O3
        4,96 real         4,56 user         0,04 sys
time ./gcc/prim-i7-gcc
       20,98 real        19,14 user         0,07 sys
time ./gcc/prim-i7-gcc-O2
        4,91 real         4,54 user         0,02 sys
time ./gcc/prim-i7-gcc-O3
        5,06 real         4,56 user         0,01 sys

=======================================

time ./clang/prim-native-clang
       17,66 real        16,02 user         0,08 sys
time ./clang/prim-native-clang-O2
        5,29 real         4,71 user         0,03 sys
time ./clang/prim-native-clang-O3
        5,02 real         4,64 user         0,02 sys
time ./clang/prim-nocona-clang
       17,45 real        15,97 user         0,05 sys
time ./clang/prim-nocona-clang-O2
        4,94 real         4,62 user         0,03 sys
time ./clang/prim-i7-gcc
       17,30 real        15,94 user         0,07 sys
time ./clang/prim-i7-clang-O2
        5,24 real         4,65 user         0,05 sys
time ./clang/prim-i7-clang-O3
        5,14 real         4,66 user         0,01 sys