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Boost.SIMD   - a C++ template library that aims to give a simple and powerful way to access the benefits of SIMD extensions.
FastPFor: Fast integer compression  Daniel Lemire, Leonid Boytsov, Owen Kaser, Maxime Caron, Louis Dionne - A research library with integer compression schemes. It should be suitable for applications to d-gap compression and delta coding in general. It relies on SIMD instructions and is, therefore, very fast.
sse-popcount   - fast bit counting (population counting): a fast replacement for built-in Intel operations.
Vectorclass  Agner Fog - a collection of C++ classes, functions and operators that makes it easier to use the the vector instructions (Single Instruction Multiple Data instructions) of modern CPUs without using assembly language. Supports the SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, AVX, AVX2, FMA, and XOP instruction sets.