It shouldn't if the control flow is actually identical. E.g. note how both the switch- and if-based functions generate the same code using a lookup table here:

It shouldn't if the control flow is actually identical. E.g. note how both the switch- and if-based functions generate the same code using a lookup table here: https://godbolt.org/z/qoT3M7r5G https://godbolt.org/z/qoT3M7r5G