@r-barnes These were the main topics I could think of that I feel can be adopted without disruptions. ranges, modules etc are big ticket items that I don't feel comfortable recommending at the moment.

Move away from compiler extensions

• Replace ##__VA_ARGS__ with __VA_OPT__(, ) __VA_ARGS__
• Use [[likely]], [[unlikely]] for branch prediction hints
  • Seems like they are pretty tricky to use
• std::assume_aligned<N>(ptr) to replace __builtin_assume_aligned
• Use <bit> header for bitwise operations: clang-tidy checker
  • #186854

Move away from custom implementations of common utilities

• Remove c10::SourceLocation, __FILE__, __LINE__ proposed clang-tidy checker
• std::midpoint, std::lerp
• std::ssiz…