All of the major C/C++ compilers are deterministic functions of their inputs. This is a pretty major property, and any regression is rapidly detected and fixed.

All of the major C/C++ compilers are deterministic functions of their inputs. This is a pretty major property, and any regression is rapidly detected and fixed. Optimization "timeouts" aren't done in wall time, but in something that can be deterministically counted: number of instructions, number of recurrences up a call stack or expression tree, etc.