How much accessing msg.sender costs? Is it useful to store it in a variable and then use it instead of accessing msg.sender multiple times?

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How much accessing msg.sender costs? Is it useful to store it in a variable and then use it instead of accessing msg.sender multiple times? I have to access current user variable multiple times in a function.

solidity
1 Answers

Using msg.sender will always be cheaper than using a local variable.

The reason is the following:

The CALLER operation which is reading the msg.sender global variable costs 2.

While MLOAD/MSTORE operations which are memory operations (storage where local variables are stored) costs 3.

You can check gas costs for each operation here.

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