pub fn multiplier(divisor: u128, bits: u32, precision: u32) -> (u128, u32)Expand description
The magic number for dividing by divisor a value of bits bits whose top bits - precision
bits are known to be clear, and the shift that goes after the multiply.
choose_multiplier at gcc/expmed.cc:3728. The quotient is the product shifted right by bits
and then by the shift. The number is the smallest that is still exact over the whole range,
which is found by starting from the largest shift that can work and halving both bounds for as
long as they stay apart.
ยงPanics
Panics if the divisor is zero or the working does not fit, which is a width over sixty four.