diff --git a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index 9042147..fc08384 100644
--- a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -302,7 +302,7 @@
     OutStreamer.GetCommentOS() << '\n';
   }
 
-  // Emit the CurrentFnSym.  This is is a virtual function to allow targets to
+  // Emit the CurrentFnSym.  This is a virtual function to allow targets to
   // do their wild and crazy things as required.
   EmitFunctionEntryLabel();
   
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 0182027..5093dd9 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -618,7 +618,7 @@
 
    1).  Add the offset of the forwarding field.
 
-   2).  Follow that pointer to get the the real __Block_byref_x_VarName
+   2).  Follow that pointer to get the real __Block_byref_x_VarName
    struct to use (the real one may have been copied onto the heap).
 
    3).  Add the offset for the field VarName, to find the actual variable.
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.h b/lib/CodeGen/AsmPrinter/DwarfDebug.h
index be1a5f0..55baa92 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -103,7 +103,7 @@
   ///
   SmallVector<std::pair<unsigned, unsigned>, 8> SourceIds;
 
-  /// Lines - List of of source line correspondence.
+  /// Lines - List of source line correspondence.
   std::vector<SrcLineInfo> Lines;
 
   /// DIEValues - A list of all the unique values in use.
diff --git a/lib/CodeGen/AsmPrinter/DwarfException.h b/lib/CodeGen/AsmPrinter/DwarfException.h
index 89d55f7..06033a1 100644
--- a/lib/CodeGen/AsmPrinter/DwarfException.h
+++ b/lib/CodeGen/AsmPrinter/DwarfException.h
@@ -103,7 +103,7 @@
   ///     exception.  If it matches then the exception and type id are passed
   ///     on to the landing pad.  Otherwise the next action is looked up.  This
   ///     chain is terminated with a next action of zero.  If no type id is
-  ///     found the the frame is unwound and handling continues.
+  ///     found the frame is unwound and handling continues.
   ///  3. Type id table contains references to all the C++ typeinfo for all
   ///     catches in the function.  This tables is reversed indexed base 1.
 
diff --git a/lib/CodeGen/CodePlacementOpt.cpp b/lib/CodeGen/CodePlacementOpt.cpp
index cbf5b89..05a57d4 100644
--- a/lib/CodeGen/CodePlacementOpt.cpp
+++ b/lib/CodeGen/CodePlacementOpt.cpp
@@ -115,7 +115,7 @@
   // Ask the target's AnalyzeBranch if it can handle this block.
   MachineBasicBlock *TBB = 0, *FBB = 0;
   SmallVector<MachineOperand, 4> Cond;
-  // Make the the terminator is understood.
+  // Make the terminator is understood.
   if (TII->AnalyzeBranch(*MBB, TBB, FBB, Cond))
     return false;
   // Make sure we have the option of reversing the condition.
diff --git a/lib/CodeGen/ExactHazardRecognizer.cpp b/lib/CodeGen/ExactHazardRecognizer.cpp
index 266c74c..61959bb 100644
--- a/lib/CodeGen/ExactHazardRecognizer.cpp
+++ b/lib/CodeGen/ExactHazardRecognizer.cpp
@@ -7,7 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// This implements a a hazard recognizer using the instructions itineraries
+// This implements a hazard recognizer using the instructions itineraries
 // defined for the current target.
 //
 //===----------------------------------------------------------------------===//
diff --git a/lib/CodeGen/MachineFunction.cpp b/lib/CodeGen/MachineFunction.cpp
index 97b86cb..f141c56 100644
--- a/lib/CodeGen/MachineFunction.cpp
+++ b/lib/CodeGen/MachineFunction.cpp
@@ -187,7 +187,7 @@
 }
 
 /// CloneMachineInstr - Create a new MachineInstr which is a copy of the
-/// 'Orig' instruction, identical in all ways except the the instruction
+/// 'Orig' instruction, identical in all ways except the instruction
 /// has no parent, prev, or next.
 ///
 MachineInstr *
diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index 34f7781..df61c74 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -1034,7 +1034,7 @@
 
 /// isInvariantLoad - Return true if this instruction is loading from a
 /// location whose value is invariant across the function.  For example,
-/// loading a value from the constant pool or from from the argument area
+/// loading a value from the constant pool or from the argument area
 /// of a function if it does not change.  This should only return true of
 /// *all* loads the instruction does are invariant (if it does multiple loads).
 bool MachineInstr::isInvariantLoad(AliasAnalysis *AA) const {
diff --git a/lib/CodeGen/PBQP/HeuristicSolver.h b/lib/CodeGen/PBQP/HeuristicSolver.h
index 2d72b1f..b48f548 100644
--- a/lib/CodeGen/PBQP/HeuristicSolver.h
+++ b/lib/CodeGen/PBQP/HeuristicSolver.h
@@ -9,7 +9,7 @@
 //
 // Heuristic PBQP solver. This solver is able to perform optimal reductions for
 // nodes of degree 0, 1 or 2. For nodes of degree >2 a plugable heuristic is
-// used to to select a node for reduction. 
+// used to select a node for reduction. 
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 10487da..9189e71 100644
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -2640,7 +2640,7 @@
 
       // If the shift is not a no-op (in which case this should be just a sign
       // extend already), the truncated to type is legal, sign_extend is legal
-      // on that type, and the the truncate to that type is both legal and free,
+      // on that type, and the truncate to that type is both legal and free,
       // perform the transform.
       if ((ShiftAmt > 0) &&
           TLI.isOperationLegalOrCustom(ISD::SIGN_EXTEND, TruncVT) &&
diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index 12a4b31..78e6e4e 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -2767,7 +2767,7 @@
                             DAG.getIntPtrConstant(1));
     } else {
       // FIXME: We should be able to fall back to a libcall with an illegal
-      // type in some cases cases.
+      // type in some cases.
       // Also, we can fall back to a division in some cases, but that's a big
       // performance hit in the general case.
       llvm_unreachable("Don't know how to expand this operation yet!");
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 24ac34c..de17f90 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -1349,7 +1349,7 @@
                             DAG.getConstant(JTH.First, VT));
 
   // The SDNode we just created, which holds the value being switched on minus
-  // the the smallest case value, needs to be copied to a virtual register so it
+  // the smallest case value, needs to be copied to a virtual register so it
   // can be used as an index into the jump table in a subsequent basic block.
   // This value may be smaller or larger than the target's pointer type, and
   // therefore require extension or truncating.
@@ -4865,7 +4865,7 @@
     EVT ThisVT = MVT::Other;
 
     const TargetRegisterClass *RC = *RCI;
-    // If none of the the value types for this register class are valid, we
+    // If none of the value types for this register class are valid, we
     // can't use it.  For example, 64-bit reg classes on 32-bit targets.
     for (TargetRegisterClass::vt_iterator I = RC->vt_begin(), E = RC->vt_end();
          I != E; ++I) {
diff --git a/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index f923927..d74ec7e 100644
--- a/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -2366,7 +2366,7 @@
        E = RI->regclass_end(); RCI != E; ++RCI) {
     const TargetRegisterClass *RC = *RCI;
     
-    // If none of the the value types for this register class are valid, we 
+    // If none of the value types for this register class are valid, we 
     // can't use it.  For example, 64-bit reg classes on 32-bit targets.
     bool isLegal = false;
     for (TargetRegisterClass::vt_iterator I = RC->vt_begin(), E = RC->vt_end();
diff --git a/lib/CodeGen/SimpleRegisterCoalescing.cpp b/lib/CodeGen/SimpleRegisterCoalescing.cpp
index 1faa5a0..1d9bda4 100644
--- a/lib/CodeGen/SimpleRegisterCoalescing.cpp
+++ b/lib/CodeGen/SimpleRegisterCoalescing.cpp
@@ -197,7 +197,7 @@
 
   SlotIndex FillerStart = ValLR->end, FillerEnd = BLR->start;
   // We are about to delete CopyMI, so need to remove it as the 'instruction
-  // that defines this value #'. Update the the valnum with the new defining
+  // that defines this value #'. Update the valnum with the new defining
   // instruction #.
   BValNo->def  = FillerStart;
   BValNo->setCopy(0);
diff --git a/lib/CodeGen/SlotIndexes.cpp b/lib/CodeGen/SlotIndexes.cpp
index e5a87f7..6110ef5 100644
--- a/lib/CodeGen/SlotIndexes.cpp
+++ b/lib/CodeGen/SlotIndexes.cpp
@@ -95,7 +95,7 @@
 
   push_back(createEntry(0, index));
 
-  // Iterate over the the function.
+  // Iterate over the function.
   for (MachineFunction::iterator mbbItr = mf->begin(), mbbEnd = mf->end();
        mbbItr != mbbEnd; ++mbbItr) {
     MachineBasicBlock *mbb = &*mbbItr;
diff --git a/lib/CodeGen/StrongPHIElimination.cpp b/lib/CodeGen/StrongPHIElimination.cpp
index d68e0ad..f8f6a55 100644
--- a/lib/CodeGen/StrongPHIElimination.cpp
+++ b/lib/CodeGen/StrongPHIElimination.cpp
@@ -49,7 +49,7 @@
     std::map<unsigned, std::vector<unsigned> > Stacks;
     
     // Registers in UsedByAnother are PHI nodes that are themselves
-    // used as operands to another another PHI node
+    // used as operands to another PHI node
     std::set<unsigned> UsedByAnother;
     
     // RenameSets are the is a map from a PHI-defined register
diff --git a/lib/CodeGen/VirtRegMap.cpp b/lib/CodeGen/VirtRegMap.cpp
index d4fb2e4..5956b61 100644
--- a/lib/CodeGen/VirtRegMap.cpp
+++ b/lib/CodeGen/VirtRegMap.cpp
@@ -9,7 +9,7 @@
 //
 // This file implements the VirtRegMap class.
 //
-// It also contains implementations of the the Spiller interface, which, given a
+// It also contains implementations of the Spiller interface, which, given a
 // virtual register map and a machine function, eliminates all virtual
 // references by replacing them with physical register references - adding spill
 // code as necessary.