3 ms·

It was addressed that it didn't optimize it this way, but no one has clarified why it didn't. I'm curious!

• ygra 8y ago
  A Just-in-time compiler has to find a balance between compilation time (which slows down your program or makes it slower to start) and optimization quality. So a lot of optimizations that are OK in C++ where you have lots of time because of AOT compilation are not feasible for a JIT. Things could be different by now, though, with RyuJIT and tiered compilation. That article is quite old (although processors still work the same, just with larger caches).
  • monocasa 8y ago
    Constant propagation is pretty cheap though and is a common JIT compiler technique.
    • Symmetry 8y ago
      Constant propagation yes. But knowing that that memory location wasn't volatile, say, is a lot harder and I don't blame a JIT for not being sure.
      • monocasa 8y ago
        C# very easily knows if a variable like that is volatile.