LLVM Improves Zen 1 / Zen 2 Support To Deal With "Notoriously Bad" PDEP/PEXT

The LLVM/Clang compiler toolchain merged overnight better support for the nearly decade-old AMD Zen 1 processors and also helps with Zen+ and Zen 2 processors too. This latest work thanks to the open-source community is for providing more informed instruction scheduling around PDEP and PEXT that end up being quite costly for these original Zen processors... https://www.phoronix.com/news/LLVM-Improve-AMD-PDEP-PEXT