Method prev_inst

cranelift/codegen/src/ir/layout.rs:469–471

Fetch the instruction preceding `inst`.

(&self, inst: Inst)

    /// Fetch the instruction preceding `inst`.
    pub fn prev_inst(&self, inst: Inst) -> Option<Inst> {
        self.insts[inst].prev.expand()
    }

    /// Insert `inst` before the instruction `before` in the same block.
    pub fn insert_inst(&mut self, inst: Inst, before: Inst) {