Algorithm for negative offset

[LemonParty]

Let's say I have a negative number. I searching for algorithm that work like this:
If number -31, return 0;
If number -32, return -32;
If number -63, return -32;
If number -64, return -64;
If number -65, return -64;
And so on. Is there any fast bitwise operations for that?

[Nimbus]

Can be done with bit shifts I guess, smth like

Code: Pascal  [Select][+][-]

1. Result := -(-X shr 5) shl 5;

https://www.onlinegdb.com/tyME4tkHW

assuming X is a negative integer. Shifting by 5 as log₂(32) = 5.

Or with a mask

Code: Pascal  [Select][+][-]

1. Result := -(-X and (not 31));

[LemonParty]

Thank you, Nimbus.