alt Hacker NewsWhy does an optimizing compiler introduce nondeterminism?
In my mind an optimizing compiler is a pure function that takes source code and produces an object file.
Why does an optimizing compiler introduce nondeterminism?
In my mind an optimizing compiler is a pure function that takes source code and produces an object file.
Well, lot of things can influence here. Multithreaded build, PGO, or even the different access order of the hash table inside the code optimizer can be a factor. Things are getting probalistic and thus somewhat nondeterministic: the build itself is nondeterministic but the runtime/final execution is deterministic