"using intrinsics" is a cop out: you are essentially doing the more complicated part of translating that sequence of generic C code into a rough approximation o

"using intrinsics" is a cop out: you are essentially doing the more complicated part of translating that sequence of generic C code into a rough approximation of a sequence of machine instructions and leave the compiler to do the boring and simpler parts, like register allocation, code layout and ordering of independent instructions.