FMA4
[GCC header](https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=gcc/config/i386/fma4intrin.h;h=23d36b9f5fa586a536b1b90d57c179e85f72d2cd;hb=HEAD)
[llvm header](https://github.com/llvm/llvm-project/blob/4998587e6f5f66d464ac22ad4c11fe9afd2d56ab/clang/lib/Headers/fma4intrin.h)