How To Reduce Function Call Overhead In Arm Based Systems

1.	How To Reduce Function Call Overhead In Arm Based Systems
Answer» TRY to ensure that small functions TAKE four or fewer arguments. These will not use the stack for argument passing. It will copy into registers. If a function needs more than four arguments, try to ensure that it does a SIGNIFICANT amount of work, so that the cost of passing the stacked arguments is outweighed. Pass pointers to structures instead of passing the structure itself. Put related arguments in a structure, and pass a pointer to the structure to functions. This will reduce the number of parameters and increase readability. Minimize the number of long long parameters, as these take two argument words. This also applies to doubles if software floating-point is enabled. Avoid functions with a parameter that is passed PARTIALLY in a register and partially on the stack (split-argument). This is not handled efficiently by the CURRENT compilers: all register arguments are pushed on the stack. Avoid functions with a variable number of parameters. Varargs functions.

Answer»

TRY to ensure that small functions TAKE four or fewer arguments. These will not use the stack for argument passing. It will copy into registers.
If a function needs more than four arguments, try to ensure that it does a SIGNIFICANT amount of work, so that the cost of passing the stacked arguments is outweighed.
Pass pointers to structures instead of passing the structure itself.
Put related arguments in a structure, and pass a pointer to the structure to functions. This will reduce the number of parameters and increase readability.
Minimize the number of long long parameters, as these take two argument words. This also applies to doubles if software floating-point is enabled.
Avoid functions with a parameter that is passed PARTIALLY in a register and partially on the stack (split-argument). This is not handled efficiently by the CURRENT compilers: all register arguments are pushed on the stack.
Avoid functions with a variable number of parameters. Varargs functions.

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