The sibling comment talking about division _instructions_ is spot on. It's sort of like how you can use shifts and other bit twiddling to divide by small const

The sibling comment talking about division _instructions_ is spot on. It's sort of like how you can use shifts and other bit twiddling to divide by small constants (like 5) much more quickly than actually issuing a division instruction. Or, to divide a float by an integer power of 2 you can just manually set the exponent bits correctly.