199c199
< return new WarnUnimplemented("dsb", machInst);
---
> return new Dsb(machInst);
201c201
< return new WarnUnimplemented("dmb", machInst);
---
> return new Dmb(machInst);
203c203
< return new WarnUnimplemented("isb", machInst);
---
> return new Isb(machInst);