[IAmLiterallyAB]

The same (and more) stack space will be used if it was called as a regular function, whether that's preserving registers across the call boundary or simply running out of registers. So this shouldn't save any space, temporarily or otherwise.

[Spivak]

We’re not at all disagreeing. Calling vs inlining trades higher peak stack usage for (ideally) lower average stack usage.

Long running function calling short lived but high memory use function is a bad candidate for inlining because of that.