[Octave-bug-tracker] [bug #52809] interpreter performance is slow on development branch

[John W. Eaton]

Follow-up Comment #5, bug #52809 (project octave):

I'm pretty sure that a significant portion of this problem is caused by always
creating an octave_value_list object even when only one value is requested or
produced.  In the past, we had two methods for computing values, rvalue
(produce an octave_value_list) and rvalue1 (produce a single octave_value
object).  The binary expression evaluator used rvalue1 to compute values from
the operand expressions.  But when I refactored the evaluator I changed the
expression evaluation methods to always generate an octave value list even
when only one value is needed.  So in those cases, we are creating an
octave_value_list object with one value, pushing it on a stack, and then
extracting it.  I'm sure even I can do better than that now that I see it's
likely an issue...


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