Re: Optimizing empty functions in C

Scott Nicol wrote:


> On a typical risc processor, evaluating an if and calling a function take
> about the same amount of time, so you should just call the function. On
> intel, function calls take a lot longer, so it is probably worth evaluating
> the if.
>
> The only way to figure out what works best is to write some test code and
> try it on potential target compilers.


Thanks for the reply. The problem is I target embedded systems
compilers mostly. This also means that I have no way to try this out
and I am asking for common experience here. Is there anybody who knows
if it pays of to check if the call is redundant in typical
microcontroller? Otherwise how cost of a condition test relates to
cost of function call on MCU?


andrzej

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