[Ar-Curunir]

That’s not true anyway today, because the assembly generated depends on the architecture, and there’s sufficient diversity there.

The only thing that you can predict about compiled C code is the instructions in the C abstract machine, because that’s what C targets.

[Sulik]

You can predict a pseudo-assembly output for a mental model of the architecture(s) you're targeting. It doesn't have to be an exact match, register allocation and all.