x86-64 (AMD64 / EMT64)

The 64bit extended x86 architecture developed by AMD and later adopted by Intel and VIA named EMT64.

Support in T2 rock solid - certainly nowadays used for most production environments.

Since January 2016 T2 also supports the x32 ABI. While using ILP32 (Int, Long, and Pointers 32-bits) the generated machien code can still use all the many more registers provided by x86-64, but reducing the memory and thus cache footprint and so usually improving performance.

The obvious drawback is the much small memory address space, especially for large databases, scientific computing, and multimedia applications. Especially affecting mmap'ing (memory mapping) large files.