+
+/// markUsesInDebugValueAsUndef - Mark every DBG_VALUE referencing the
+/// specified register as undefined which causes the DBG_VALUE to be
+/// deleted during LiveDebugVariables analysis.
+void MachineRegisterInfo::markUsesInDebugValueAsUndef(unsigned Reg) const {
+ // Mark any DBG_VALUE that uses Reg as undef (but don't delete it.)
+ MachineRegisterInfo::use_instr_iterator nextI;
+ for (use_instr_iterator I = use_instr_begin(Reg), E = use_instr_end();
+ I != E; I = nextI) {
+ nextI = std::next(I); // I is invalidated by the setReg
+ MachineInstr *UseMI = &*I;
+ if (UseMI->isDebugValue())
+ UseMI->getOperand(0).setReg(0U);
+ }
+}