if (VM.VerifyAssertions) VM.assert(!cond.isUNSIGNED());
if (VM.VerifyAssertions) VM._assert(!cond.isUNSIGNED());
  void CMP_ZERO(OPT_BURS burs, OPT_Instruction s, OPT_Operator op, 		OPT_RegisterOperand def, OPT_Operand left,		OPT_ConditionOperand cond) {    if (VM.VerifyAssertions) VM.assert(!cond.isUNSIGNED());    if (!def.register.spansBasicBlock()) {      def.register = burs.ir.regpool.getPhysicalRegisterSet().getTemp();    }