SIMD Optimized AABB Tree

CGAL’s Axis-Aligned Bounding Box Tree is an acceleration structure which speeds up common tasks such as collision-detection. It is used both directly and throughout other packages in the library, so any performance improvements made to this package will pay dividends elsewhere. The package has already been a major target of performance optimization, but one approach that hasn’t yet been fully explored is the use of SIMD, a type of parallel computation where the processor operates on several data values at a time. The introduction of SIMD optimizations to the AABB tree has the potential to substantially improve performance by better taking advantage of the capabilities of modern computer processors.