The PowerISA vector facilities (VMX and VSX) are extensive, but do not always provide a direct or obvious functional equivalent to the Intel Intrinsics. However not being obvious is not the same as impossible. It just requires some basic programing skills. It is a good idea to have an overall understanding of the vector capabilities of the PowerISA. You do not need to memorize every instruction but it helps to know where to look. Both the PowerISA and OpenPOWER ABI have a specific structure and organization that can help you find what you are looking for. It also helps to understand the relationship between the PowerISA's low level instructions and the higher abstraction of the vector intrinsics as defined by the OpenPOWER ABI's Vector Programming Interfaces and the de facto standard of GCC's PowerPC AltiVec Builtin Functions.