Bit widths for addition

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Ok. thank you. I will try that. These values are all unsigned so hopefully it wont do any bit extension or anything.

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Look at the code that implements the resize() function in the numeric_std source.

Please note that it works on only unsigned and signed types, not std_logic_vectors.

For unsigned operands, it boils down to simple zero extension. For signed operands, it does proper sign extension.