libtwiddle is a data structure library aiming for speed on modern Linux x86-64 systems. The following data structures are implemented:

• bitmaps (dense & RLE);
• Bloom filters (standard & active-active);
• HyperLogLog
• MinHash

See EXAMPLES.md and tests/examples/ for examples.

• Written for the modern age; gcc >= 4.8, using C11 features, on x86-64
• Extensive testing; unit tests and random property testing with hypothesis
• Python bindings; courtesy of property testing
• Vectorized implementations; AVX, AVX2, and partial support for AVX512
• Continuous integration

libtwiddle uses CMake as its build manager.

To build libtwiddle, you need the following:

• a recent C compiler (gcc >= 4.8 or clang >= 3.5).
• CMake build tool (cmake >= 3.0)

In most cases, you should be able to build the source code using the following:

$ mkdir build
$ cd build
$ cmake .. -DCMAKE_INSTALL_PREFIX=$PREFIX
$ make
$ make test
$ make install

By default, libtwiddle will compile with AVX SIMD instructions. Use the following flags to enable newer instructions:

• For AVX2: -DUSE_AVX2=ON;
• for AVX512: -DUSE_AVX512=ON.

Note that AVX2 implies AVX, and AVX512 implies AVX2. Some functions can't be implemented with AVX512, and will fallback to AVX2 code.

To compile without SIMD support, invoke CMake with -DUSE_AVX=OFF -DUSE_AVX2=OFF -DUSE_AVX512=OFF.

Contributions are more than welcome, see CONTRIBUTING.md for details.