Macro compiler_builtins::impl_normalization_shift

macro_rules! impl_normalization_shift {
    (
        $name:ident, // name of the normalization shift function
        // boolean for if `$uX::leading_zeros` should be used (if an architecture does not have a
        // hardware instruction for `usize::leading_zeros`, then this should be `true`)
        $use_lz:ident,
        $n:tt, // the number of bits in a $iX or $uX
        $uX:ident, // unsigned integer type for the inputs of `$name`
        $iX:ident, // signed integer type for the inputs of `$name`
        $($unsigned_attr:meta),* // attributes for the function
    ) => { ... };
}

Creates a function used by some division algorithms to compute the "normalization shift".