Module core::hint

Hints to compiler that affects how code should be emitted or optimized. Hints may be compile time or runtime.

Functions

• black_box
  An identity function that hints to the compiler to be maximally pessimistic about what black_box could do.
• spin_loop
  Emits a machine instruction to signal the processor that it is running in a busy-wait spin-loop (“spin lock”).
• unreachable_unchecked^⚠
  Informs the compiler that the site which is calling this function is not reachable, possibly enabling further optimizations.
• assert_unchecked^⚠Experimental
  Makes a soundness promise to the compiler that cond holds.
• must_useExperimental
  An identity function that causes an unused_must_use warning to be triggered if the given value is not used (returned, stored in a variable, etc) by the caller.