We use LLVM based Clang compiler for C/C++ in Yoe and its a good news that 13.0 is now out see https://github.com/llvm/llvm-project/releases/tag/llvmorg-13.0.0
phoronix has good high level changes covered LLVM 13.0 Released With Official Flang Binary Packages, Improved OpenCL Clang Support - Phoronix