When using Clang org CC (possibly other compilers, too), you don’t need to use intrinsics. These compilers have some support for vector types (https://clang.llvm.org/docs/LanguageExtensions.html#vectors-..., https://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html)

One can, for example, write:

  typedef int v4si __attribute__ ((vector_size (16)));

  v4si a, b, c;
  […]
  b += 3; // add 3 to each of b’s elements
  c = a + b; // pairwise addition

Using this gives up some control over assembly; it doesn’t guarantee vector instructions get used, but it makes it easier for the compiler to generate them.

Also, I’m fairly sure there are vector instructions not covered by this extension.