0100mmmm00100111
md ← ZeroExtend1(MD);
IF (md = 0)
THROW RESINST;
op1 ← SignExtend32(Rm);
address ← ZeroExtend32(op1);
vbr ← SignExtend32(ReadMemory32(address));
op1 ← op1 + 4;
Rm ← Register(op1);
VBR ← Register(vbr);