[erlang-questions] Tuple values returned in registers, without using heap space?
Mon Oct 19 17:06:33 CEST 2009
2009/10/19 James Hague <james.hague@REDACTED>
> I *thought* I remember reading about this in the release notes at one time,
> but I haven't been able to track it down. The gist was that if it could be
> determined that a non-exported function always returned a tuple of a fixed
> size, then those values were returned directly in BEAM registers without
> actually creating a tuple.
> Any pointers?
Yes, this could be done in the compiler, the basic mechanisms are there but
it is not done today. Except *within* functions when it is safe. To do so
between non-exported functions in a module would be possible but require
more analysis. Apart from checking that a function always returned a tuple
of fixed size you would need to analyze the calls to such that function and
fix the handling of the return tuple values. Not impossible of course but
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