GCC 11's x86-64 Microarchitecture Feature Levels Are Ready To Roll

The Linux x86_64 micro-architecture feature levels have taken shape this year for different feature/performance levels based on a CPU's capabilities. Both LLVM Clang 12 and GCC 11 are ready to go in offering the new x86-64-v2, x86-64-v3, and x86-64-v4 targets...