Function cloning

cranelift/codegen/src/ir/dfg.rs:1787–1805

()

    #[test]
    fn cloning() {
        use crate::ir::InstBuilder;

        let mut func = Function::new();
        let mut sig = Signature::new(crate::isa::CallConv::SystemV);
        sig.params.push(ir::AbiParam::new(types::I32));
        let sig = func.import_signature(sig);
        let block0 = func.dfg.make_block();
        let mut pos = FuncCursor::new(&mut func);
        pos.insert_block(block0);
        let v1 = pos.ins().iconst(types::I32, 0);
        let v2 = pos.ins().iconst(types::I32, 1);
        let call_inst = pos.ins().call_indirect(sig, v1, &[v1]);
        let func = pos.func;

        let call_inst_dup = func.dfg.clone_inst(call_inst);
        func.dfg.inst_args_mut(call_inst)[0] = v2;
        assert_eq!(v1, func.dfg.inst_args(call_inst_dup)[0]);
    }
}