Re-apply my liveintervalanalysis changes. Now with PR1207 fixes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34428 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 11 insertions, 0 deletions

diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index a39313310c..01a3e3ee38 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -180,6 +180,17 @@ MachineOperand *MachineInstr::findRegisterUseOperand(unsigned Reg) {
   return NULL;
 }
   
+/// findRegisterDefOperand() - Returns the MachineOperand that is a def of
+/// the specific register or NULL if it is not found.
+MachineOperand *MachineInstr::findRegisterDefOperand(unsigned Reg) {
+  for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
+    MachineOperand &MO = getOperand(i);
+    if (MO.isReg() && MO.isDef() && MO.getReg() == Reg)
+      return &MO;
+  }
+  return NULL;
+}
+  
 /// copyKillDeadInfo - Copies kill / dead operand properties from MI.
 ///
 void MachineInstr::copyKillDeadInfo(const MachineInstr *MI) {