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The library is developed in C++11. A separate, C++03 branch is provided for compatibility with older compilers. Note that the master branch is unstable. If unsure, use one of the releases or at least the latest beta.

1.0

C++11 version

C++03-compatible version

Supported instruction sets: SSE2, SSE3, SSSE3, SSE4.1, AVX, AVX2, FMA3, FMA4, XOP and NEON

Supported compilers:

• C++11 version:

  • GCC: 4.8.1, 4.7.3
  • Clang: 3.3, 3.4

• C++98 version

  • GCC: 4.8.1, 4.7.3
  • Clang: 3.3, 3.4

Roadmap

A 2.0 release of the library is planned. It contains lots of new features and a different high-level architecture which necessitated a major API break.

Changes:

• Expression template-based backend. It is used only for functions that may benefit from micro-optimizations.
• Support for vectors much longer than the native vector type. The only limitation is that the length must be a power of 2. The widest available instructions are used for the particular vector type.
• Vector initialization is simplified, for example: int32<8> v = make_uint(2);
• API break: int128 and int256 types have been removed. On some architectures such as AVX512 it's more efficient to have different physical representations for vectors with different element widths. E.g. 8-bit integer elements would use 256-bit vectors and 32-bit integer elements would use 512-bit vectors.
• API break: 'broadcast' family of functions have been renamed to 'splat'
• API break: 'permute' family of functions has been renamed to 'permute2' and 'permute4' depending on the number of template arguments taken.
• API break: value conversion functions such as to_float32x4 have been renamed and now returns a vector with the same number of elements as the source vector.
• API break: saturated add and sub are now called sat_add and sat_sub
• More API breaks... (grep for 'API break' in the commit logs)

Planned changes:

• Visual Studio support
• AVX512 support