"Old inliner"?

[David Mercer]

While compiling code with "erlc +verbose", I received the following
(informational) message:

 

Old inliner: threshold=0 functions=[{call,3},{call,3}]

 

I am explicitly inlining call/3, but a web search on what the "old inliner"
is only seems to find readme's with information about it being fixed.  What
is the "old inliner"?  Are there other inliners (like a new one)?

 

Please advise.  Thank-you.

 

Cheers,

 

David