There is a Nokia branch called Nokia Technologies. They invest money in R&D, they file for genuine patents involving new technology, for instance in audio and video compression. (They want to sue Netflix or already sued). Them defending themselves against patent abuse is how they earn money. And they go against other big corps. This is vastly different than your typical patent troll.
The reason is SIMD instructions / vectorized assembly instructions with consideration for delay slots, instruction latency, memory access times etc., for which GCC and Clang optimizers are both terrible and cannot automatically transform C code to them in any but simple cases.
This is also a reason why specialized DSP processors with SIMD capabilities have dedicated proprietary compilers for them.