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| $ g++ --version | |
| Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1 | |
| Apple LLVM version 8.0.0 (clang-800.0.38) | |
| Target: x86_64-apple-darwin15.6.0 | |
| Thread model: posix | |
| InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin | |
| $ g++ count_bits.cpp -o count_bits -std=c++11 -O0 | |
| $ ./count_bits | |
| count_by_table : sum=7999011000, duration=1735250964ns | |
| count_by_bit_operation: sum=7999011000, duration=1024207704ns | |
| $ g++ count_bits.cpp -o count_bits -std=c++11 -O3 | |
| $ ./count_bits | |
| count_by_table : sum=7997909000, duration=513859720ns | |
| count_by_bit_operation: sum=7997909000, duration=343567094ns |
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