https://www.andreinc.net/2023/02/01/demystifying-bitwise-ops#multiplying-a-number-with-a-power-of-two https://www.andreinc.net/2023/02/01/demystifying-bitwise-o

https://www.andreinc.net/2023/02/01/demystifying-bitwise-ops#multiplying-a-number-with-a-power-of-two https://www.andreinc.net/2023/02/01/demystifying-bitwise-ops... With -O1 it performed the optimisation.