Most CPU's has signed and unsigned right shift instructions (left shift is the same), so yes it works (You can test this in C by casting a signed to unsigned be

Most CPU's has signed and unsigned right shift instructions (left shift is the same), so yes it works (You can test this in C by casting a signed to unsigned before shifting). The biggest caveat is that right shifting -1 still produces -1 instead of 0, but that's usually fine for much older game fixed-point maths since -1 is close enough to 0.