TurpIF

In fact, you can access the hardware through native calls via JNI (or JNA). Or course, then, you have to embedded multiplatform libraries and manage the associated issues. Also, the OpenBLAS implementation is very well optimized for several Intel and AMD processors (you can compile it so that it autodetects which one you're using). It can even reach the efficiency of the Intel's MKL implementation in mono-threaded mode.