title: c++ SSE SIMD framework
body: <p>Does anyone know an open-source C++ x86 SIMD intrinsics library? </p>
  
  <p>Intel supplies exactly what I need in their integrated performance primitives library, but I can't use that because of the copyrights all over the place.</p>
  
  <p><strong>EDIT</strong></p>
  
  <p>I already know the intrinsics provided by the compilers. What I need is a convenient interface to use them.</p>