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GCC has the _builtin_expect macro to give hint for branch prediction. C++ has added something similar recently .

• mhh__ 2y ago
  These are usually for the compiler rather than the CPU e.g. I don't want my error-handling code inlined! (But the compiler can't work this out without a hint)
  • astrange 2y ago
    Yes, there actually isn't a way to explicitly hint branch predictors on modern CPUs.