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Effect of returning a variable from a function on stack size and no. of cycle in 8051

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What is the effect of returning a variable from a function (embedded C) on the stack size? Is it a good approach to always return a variable or we should minimize the use of it? All of you please put up your opinions with brief reason.
 

Due to limited stack space, the standard method of 8051 compilers for returning function results is passing them in registers. Consult your compiler manual for details. Clearly you won't use function results without a purpose.
 
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