[jplusequalt]

In the previous scenario, programmers were still writing the code themselves. The compilers, if they were any good, generated deterministic code.

In our current scenario, programmers are merely describing what they think the code should do, and another program takes their description and then stochastically generates code based on it.

[david-gpu]

Compilers are (a) typically non-deterministic and, (b) produce different code from one version to the next, from one brand to the next, and from one set of flags to the next.