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Take the following code:

pragma solidity >=0.8.19 <0.9.0;

contract Foo {
    uint256 public constant SIZE = 10;

    function func(uint256 x) external pure returns (uint256) {
        uint256 y = SIZE * 3;
        return x + y;
    }
}

Since this function doesn't wrap the calculations in an unchecked block, x + y is calculated using checked arithmetic.

But will SIZE * 3 also be calculated like that? Or will Solidity inline this value (30 in this case) in the contract's bytecode because SIZE is a constant?

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