Method insert

cranelift/codegen/src/machinst/vcode.rs:1851–1881

Insert a constant; using this method indicates that a constant value will be used and thus will be emitted to the `MachBuffer`. The current implementation can deduplicate constants that are [VCodeConstantData::Pool] or [VCodeConstantData::WellKnown] but not [VCodeConstantData::Generated].

(&mut self, data: VCodeConstantData)

    /// that are [VCodeConstantData::Pool] or [VCodeConstantData::WellKnown] but not
    /// [VCodeConstantData::Generated].
    pub fn insert(&mut self, data: VCodeConstantData) -> VCodeConstant {
        match data {
            VCodeConstantData::Generated(_) => self.constants.push(data),
            VCodeConstantData::Pool(constant, _) => match self.pool_uses.get(&constant) {
                None => {
                    let vcode_constant = self.constants.push(data);
                    self.pool_uses.insert(constant, vcode_constant);
                    vcode_constant
                }
                Some(&vcode_constant) => vcode_constant,
            },
            VCodeConstantData::WellKnown(data_ref) => {
                match self.well_known_uses.entry(data_ref as *const [u8]) {
                    Entry::Vacant(v) => {
                        let vcode_constant = self.constants.push(data);
                        v.insert(vcode_constant);
                        vcode_constant
                    }
                    Entry::Occupied(o) => *o.get(),
                }
            }
            VCodeConstantData::U64(value) => match self.u64s.entry(value) {
                Entry::Vacant(v) => {
                    let vcode_constant = self.constants.push(data);
                    v.insert(vcode_constant);
                    vcode_constant
                }
                Entry::Occupied(o) => *o.get(),
            },
        }
    }

    /// Return the number of constants inserted.
    pub fn len(&self) -> usize {