diff --git a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index 024a252..19cb41d 100644
--- a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -498,8 +498,9 @@
     OutStreamer.SwitchSection(ReadOnlySection);
     JTInDiffSection = true;
   }
-  
-  EmitAlignment(Log2_32(MJTI->getAlignment()));
+
+  unsigned EntrySize = MJTI->getEntrySize(*TM.getTargetData());
+  EmitAlignment(Log2_32(MJTI->getEntryAlignment(*TM.getTargetData())));
   
   for (unsigned i = 0, e = JT.size(); i != e; ++i) {
     const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
@@ -528,7 +529,6 @@
     if (!IsPic) {
       // In non-pic mode, the entries in the jump table are direct references
       // to the basic blocks.
-      unsigned EntrySize = MJTI->getEntrySize();
       for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
         MCSymbol *MBBSym = GetMBBSymbol(JTBBs[ii]->getNumber());
         OutStreamer.EmitValue(MCSymbolRefExpr::Create(MBBSym, OutContext),
@@ -566,7 +566,8 @@
     Val = MCBinaryExpr::CreateSub(Val, JTI, OutContext);
   }
   
-  OutStreamer.EmitValue(Val, MJTI->getEntrySize(), /*addrspace*/0);
+  unsigned EntrySize = MJTI->getEntrySize(*TM.getTargetData());
+  OutStreamer.EmitValue(Val, EntrySize, /*addrspace*/0);
 }
 
 
diff --git a/lib/CodeGen/BranchFolding.cpp b/lib/CodeGen/BranchFolding.cpp
index 92849d3..4f76aac 100644
--- a/lib/CodeGen/BranchFolding.cpp
+++ b/lib/CodeGen/BranchFolding.cpp
@@ -206,53 +206,56 @@
   // See if any jump tables have become mergable or dead as the code generator
   // did its thing.
   MachineJumpTableInfo *JTI = MF.getJumpTableInfo();
+  if (JTI == 0) {
+    delete RS;
+    return MadeChange;
+  }
+  
   const std::vector<MachineJumpTableEntry> &JTs = JTI->getJumpTables();
-  if (!JTs.empty()) {
-    // Figure out how these jump tables should be merged.
-    std::vector<unsigned> JTMapping;
-    JTMapping.reserve(JTs.size());
+  // Figure out how these jump tables should be merged.
+  std::vector<unsigned> JTMapping;
+  JTMapping.reserve(JTs.size());
 
-    // We always keep the 0th jump table.
-    JTMapping.push_back(0);
+  // We always keep the 0th jump table.
+  JTMapping.push_back(0);
 
-    // Scan the jump tables, seeing if there are any duplicates.  Note that this
-    // is N^2, which should be fixed someday.
-    for (unsigned i = 1, e = JTs.size(); i != e; ++i) {
-      if (JTs[i].MBBs.empty())
-        JTMapping.push_back(i);
-      else
-        JTMapping.push_back(JTI->getJumpTableIndex(JTs[i].MBBs));
-    }
+  // Scan the jump tables, seeing if there are any duplicates.  Note that this
+  // is N^2, which should be fixed someday.
+  for (unsigned i = 1, e = JTs.size(); i != e; ++i) {
+    if (JTs[i].MBBs.empty())
+      JTMapping.push_back(i);
+    else
+      JTMapping.push_back(JTI->getJumpTableIndex(JTs[i].MBBs));
+  }
 
-    // If a jump table was merge with another one, walk the function rewriting
-    // references to jump tables to reference the new JT ID's.  Keep track of
-    // whether we see a jump table idx, if not, we can delete the JT.
-    BitVector JTIsLive(JTs.size());
-    for (MachineFunction::iterator BB = MF.begin(), E = MF.end();
-         BB != E; ++BB) {
-      for (MachineBasicBlock::iterator I = BB->begin(), E = BB->end();
-           I != E; ++I)
-        for (unsigned op = 0, e = I->getNumOperands(); op != e; ++op) {
-          MachineOperand &Op = I->getOperand(op);
-          if (!Op.isJTI()) continue;
-          unsigned NewIdx = JTMapping[Op.getIndex()];
-          Op.setIndex(NewIdx);
+  // If a jump table was merge with another one, walk the function rewriting
+  // references to jump tables to reference the new JT ID's.  Keep track of
+  // whether we see a jump table idx, if not, we can delete the JT.
+  BitVector JTIsLive(JTs.size());
+  for (MachineFunction::iterator BB = MF.begin(), E = MF.end();
+       BB != E; ++BB) {
+    for (MachineBasicBlock::iterator I = BB->begin(), E = BB->end();
+         I != E; ++I)
+      for (unsigned op = 0, e = I->getNumOperands(); op != e; ++op) {
+        MachineOperand &Op = I->getOperand(op);
+        if (!Op.isJTI()) continue;
+        unsigned NewIdx = JTMapping[Op.getIndex()];
+        Op.setIndex(NewIdx);
 
-          // Remember that this JT is live.
-          JTIsLive.set(NewIdx);
-        }
-    }
-
-    // Finally, remove dead jump tables.  This happens either because the
-    // indirect jump was unreachable (and thus deleted) or because the jump
-    // table was merged with some other one.
-    for (unsigned i = 0, e = JTIsLive.size(); i != e; ++i)
-      if (!JTIsLive.test(i)) {
-        JTI->RemoveJumpTable(i);
-        MadeChange = true;
+        // Remember that this JT is live.
+        JTIsLive.set(NewIdx);
       }
   }
 
+  // Finally, remove dead jump tables.  This happens either because the
+  // indirect jump was unreachable (and thus deleted) or because the jump
+  // table was merged with some other one.
+  for (unsigned i = 0, e = JTIsLive.size(); i != e; ++i)
+    if (!JTIsLive.test(i)) {
+      JTI->RemoveJumpTable(i);
+      MadeChange = true;
+    }
+
   delete RS;
   return MadeChange;
 }
@@ -957,7 +960,8 @@
       }
       // If MBB was the target of a jump table, update jump tables to go to the
       // fallthrough instead.
-      MF.getJumpTableInfo()->ReplaceMBBInJumpTables(MBB, FallThrough);
+      if (MachineJumpTableInfo *MJTI = MF.getJumpTableInfo())
+        MJTI->ReplaceMBBInJumpTables(MBB, FallThrough);
       MadeChange = true;
     }
     return MadeChange;
@@ -1191,7 +1195,8 @@
           }
 
           // Change any jumptables to go to the new MBB.
-          MF.getJumpTableInfo()->ReplaceMBBInJumpTables(MBB, CurTBB);
+          if (MachineJumpTableInfo *MJTI = MF.getJumpTableInfo())
+            MJTI->ReplaceMBBInJumpTables(MBB, CurTBB);
           if (DidChange) {
             ++NumBranchOpts;
             MadeChange = true;
diff --git a/lib/CodeGen/MachineFunction.cpp b/lib/CodeGen/MachineFunction.cpp
index 1e3e314..bea0445 100644
--- a/lib/CodeGen/MachineFunction.cpp
+++ b/lib/CodeGen/MachineFunction.cpp
@@ -96,15 +96,7 @@
                      MachineConstantPool(TM.getTargetData());
   Alignment = TM.getTargetLowering()->getFunctionAlignment(F);
 
-  // Set up jump table.
-  const TargetData &TD = *TM.getTargetData();
-  bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
-  unsigned EntrySize = IsPic ? 4 : TD.getPointerSize();
-  unsigned TyAlignment = IsPic ?
-                       TD.getABITypeAlignment(Type::getInt32Ty(F->getContext()))
-                               : TD.getPointerABIAlignment();
-  JumpTableInfo = new (Allocator.Allocate<MachineJumpTableInfo>())
-                      MachineJumpTableInfo(EntrySize, TyAlignment);
+  JumpTableInfo = 0;
 }
 
 MachineFunction::~MachineFunction() {
@@ -121,9 +113,23 @@
   }
   FrameInfo->~MachineFrameInfo();         Allocator.Deallocate(FrameInfo);
   ConstantPool->~MachineConstantPool();   Allocator.Deallocate(ConstantPool);
-  JumpTableInfo->~MachineJumpTableInfo(); Allocator.Deallocate(JumpTableInfo);
+  
+  if (JumpTableInfo) {
+    JumpTableInfo->~MachineJumpTableInfo();
+    Allocator.Deallocate(JumpTableInfo);
+  }
 }
 
+/// getOrCreateJumpTableInfo - Get the JumpTableInfo for this function, if it
+/// does already exist, allocate one.
+MachineJumpTableInfo *MachineFunction::
+getOrCreateJumpTableInfo(unsigned EntryKind) {
+  if (JumpTableInfo) return JumpTableInfo;
+  
+  JumpTableInfo = new (Allocator.Allocate<MachineJumpTableInfo>())
+    MachineJumpTableInfo((MachineJumpTableInfo::JTEntryKind)EntryKind);
+  return JumpTableInfo;
+}
 
 /// RenumberBlocks - This discards all of the MachineBasicBlock numbers and
 /// recomputes them.  This guarantees that the MBB numbers are sequential,
@@ -311,7 +317,8 @@
   FrameInfo->print(*this, OS);
   
   // Print JumpTable Information
-  JumpTableInfo->print(OS);
+  if (JumpTableInfo)
+    JumpTableInfo->print(OS);
 
   // Print Constant Pool
   ConstantPool->print(OS);
@@ -528,6 +535,37 @@
 //  MachineJumpTableInfo implementation
 //===----------------------------------------------------------------------===//
 
+/// getEntrySize - Return the size of each entry in the jump table.
+unsigned MachineJumpTableInfo::getEntrySize(const TargetData &TD) const {
+  // The size of a jump table entry is 4 bytes unless the entry is just the
+  // address of a block, in which case it is the pointer size.
+  switch (getEntryKind()) {
+  case MachineJumpTableInfo::EK_BlockAddress:
+    return TD.getPointerSize();
+  case MachineJumpTableInfo::EK_GPRel32BlockAddress:
+  case MachineJumpTableInfo::EK_LabelDifference32:
+    return 4;
+  }
+  assert(0 && "Unknown jump table encoding!");
+  return ~0;
+}
+
+/// getEntryAlignment - Return the alignment of each entry in the jump table.
+unsigned MachineJumpTableInfo::getEntryAlignment(const TargetData &TD) const {
+  // The alignment of a jump table entry is the alignment of int32 unless the
+  // entry is just the address of a block, in which case it is the pointer
+  // alignment.
+  switch (getEntryKind()) {
+  case MachineJumpTableInfo::EK_BlockAddress:
+    return TD.getPointerABIAlignment();
+  case MachineJumpTableInfo::EK_GPRel32BlockAddress:
+  case MachineJumpTableInfo::EK_LabelDifference32:
+    return TD.getABIIntegerTypeAlignment(32);
+  }
+  assert(0 && "Unknown jump table encoding!");
+  return ~0;
+}
+
 /// getJumpTableIndex - Create a new jump table entry in the jump table info
 /// or return an existing one.
 ///
diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index 1c83869..12a4b31 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -2816,9 +2816,12 @@
     SDValue Index = Node->getOperand(2);
 
     EVT PTy = TLI.getPointerTy();
-    MachineFunction &MF = DAG.getMachineFunction();
-    unsigned EntrySize = MF.getJumpTableInfo()->getEntrySize();
-    Index= DAG.getNode(ISD::MUL, dl, PTy,
+
+    const TargetData &TD = *TLI.getTargetData();
+    unsigned EntrySize =
+      DAG.getMachineFunction().getJumpTableInfo()->getEntrySize(TD);
+    
+    Index = DAG.getNode(ISD::MUL, dl, PTy,
                         Index, DAG.getConstant(EntrySize, PTy));
     SDValue Addr = DAG.getNode(ISD::ADD, dl, PTy, Index, Table);
 
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 23c7059..dddf385 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -1733,8 +1733,8 @@
   std::vector<MachineBasicBlock*> DestBBs;
   APInt TEI = First;
   for (CaseItr I = CR.Range.first, E = CR.Range.second; I != E; ++TEI) {
-    const APInt& Low = cast<ConstantInt>(I->Low)->getValue();
-    const APInt& High = cast<ConstantInt>(I->High)->getValue();
+    const APInt &Low = cast<ConstantInt>(I->Low)->getValue();
+    const APInt &High = cast<ConstantInt>(I->High)->getValue();
 
     if (Low.sle(TEI) && TEI.sle(High)) {
       DestBBs.push_back(I->BB);
@@ -1757,7 +1757,9 @@
 
   // Create a jump table index for this jump table, or return an existing
   // one.
-  unsigned JTI = CurMF->getJumpTableInfo()->getJumpTableIndex(DestBBs);
+  unsigned JTEncoding = TLI.getJumpTableEncoding();
+  unsigned JTI = CurMF->getOrCreateJumpTableInfo(JTEncoding)
+                       ->getJumpTableIndex(DestBBs);
 
   // Set the jump table information so that we can codegen it as a second
   // MachineBasicBlock
diff --git a/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index 5b00adb..966c817 100644
--- a/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -21,6 +21,7 @@
 #include "llvm/GlobalVariable.h"
 #include "llvm/DerivedTypes.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineJumpTableInfo.h"
 #include "llvm/CodeGen/SelectionDAG.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/Support/ErrorHandling.h"
@@ -793,6 +794,22 @@
   return TD->getCallFrameTypeAlignment(Ty);
 }
 
+/// getJumpTableEncoding - Return the entry encoding for a jump table in the
+/// current function.  The returned value is a member of the
+/// MachineJumpTableInfo::JTEntryKind enum.
+unsigned TargetLowering::getJumpTableEncoding() const {
+  // In non-pic modes, just use the address of a block.
+  if (getTargetMachine().getRelocationModel() != Reloc::PIC_)
+    return MachineJumpTableInfo::EK_BlockAddress;
+  
+  // In PIC mode, if the target supports a GPRel32 directive, use it.
+  if (getTargetMachine().getMCAsmInfo()->getGPRel32Directive() != 0)
+    return MachineJumpTableInfo::EK_GPRel32BlockAddress;
+  
+  // Otherwise, use a label difference.
+  return MachineJumpTableInfo::EK_LabelDifference32;
+}
+
 SDValue TargetLowering::getPICJumpTableRelocBase(SDValue Table,
                                                  SelectionDAG &DAG) const {
   if (usesGlobalOffsetTable())
diff --git a/lib/ExecutionEngine/JIT/JITEmitter.cpp b/lib/ExecutionEngine/JIT/JITEmitter.cpp
index 4dc119d..080a88c 100644
--- a/lib/ExecutionEngine/JIT/JITEmitter.cpp
+++ b/lib/ExecutionEngine/JIT/JITEmitter.cpp
@@ -847,9 +847,7 @@
   for (unsigned i = 0, e = JT.size(); i != e; ++i)
     NumEntries += JT[i].MBBs.size();
 
-  unsigned EntrySize = MJTI->getEntrySize();
-
-  return NumEntries * EntrySize;
+  return NumEntries * MJTI->getEntrySize(*TheJIT->getTargetData());
 }
 
 static uintptr_t RoundUpToAlign(uintptr_t Size, unsigned Alignment) {
@@ -1017,7 +1015,6 @@
   if (MemMgr->NeedsExactSize()) {
     DEBUG(dbgs() << "JIT: ExactSize\n");
     const TargetInstrInfo* TII = F.getTarget().getInstrInfo();
-    MachineJumpTableInfo *MJTI = F.getJumpTableInfo();
     MachineConstantPool *MCP = F.getConstantPool();
 
     // Ensure the constant pool/jump table info is at least 4-byte aligned.
@@ -1029,11 +1026,14 @@
     // Add the constant pool size
     ActualSize += GetConstantPoolSizeInBytes(MCP, TheJIT->getTargetData());
 
-    // Add the aligment of the jump table info
-    ActualSize = RoundUpToAlign(ActualSize, MJTI->getAlignment());
+    if (MachineJumpTableInfo *MJTI = F.getJumpTableInfo()) {
+      // Add the aligment of the jump table info
+      ActualSize = RoundUpToAlign(ActualSize,
+                             MJTI->getEntryAlignment(*TheJIT->getTargetData()));
 
-    // Add the jump table size
-    ActualSize += GetJumpTableSizeInBytes(MJTI);
+      // Add the jump table size
+      ActualSize += GetJumpTableSizeInBytes(MJTI);
+    }
 
     // Add the alignment for the function
     ActualSize = RoundUpToAlign(ActualSize,
@@ -1062,7 +1062,8 @@
   emitAlignment(16);
 
   emitConstantPool(F.getConstantPool());
-  initJumpTableInfo(F.getJumpTableInfo());
+  if (MachineJumpTableInfo *MJTI = F.getJumpTableInfo())
+    initJumpTableInfo(MJTI);
 
   // About to start emitting the machine code for the function.
   emitAlignment(std::max(F.getFunction()->getAlignment(), 8U));
@@ -1084,7 +1085,8 @@
     return true;
   }
 
-  emitJumpTableInfo(F.getJumpTableInfo());
+  if (MachineJumpTableInfo *MJTI = F.getJumpTableInfo())
+    emitJumpTableInfo(MJTI);
 
   // FnStart is the start of the text, not the start of the constant pool and
   // other per-function data.
@@ -1404,13 +1406,14 @@
   for (unsigned i = 0, e = JT.size(); i != e; ++i)
     NumEntries += JT[i].MBBs.size();
 
-  unsigned EntrySize = MJTI->getEntrySize();
+  unsigned EntrySize = MJTI->getEntrySize(*TheJIT->getTargetData());
 
   // Just allocate space for all the jump tables now.  We will fix up the actual
   // MBB entries in the tables after we emit the code for each block, since then
   // we will know the final locations of the MBBs in memory.
   JumpTable = MJTI;
-  JumpTableBase = allocateSpace(NumEntries * EntrySize, MJTI->getAlignment());
+  JumpTableBase = allocateSpace(NumEntries * EntrySize,
+                             MJTI->getEntryAlignment(*TheJIT->getTargetData()));
 }
 
 void JITEmitter::emitJumpTableInfo(MachineJumpTableInfo *MJTI) {
@@ -1420,8 +1423,10 @@
   const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
   if (JT.empty() || JumpTableBase == 0) return;
 
+  // FIXME: This should use MachineJumpTableInfo::getEntryKind() instead of
+  // checking for PIC etc.
   if (TargetMachine::getRelocationModel() == Reloc::PIC_) {
-    assert(MJTI->getEntrySize() == 4 && "Cross JIT'ing?");
+    assert(MJTI->getEntrySize(*TheJIT->getTargetData()) == 4&&"Cross JIT'ing?");
     // For each jump table, place the offset from the beginning of the table
     // to the target address.
     int *SlotPtr = (int*)JumpTableBase;
@@ -1437,7 +1442,8 @@
       }
     }
   } else {
-    assert(MJTI->getEntrySize() == sizeof(void*) && "Cross JIT'ing?");
+    assert(MJTI->getEntrySize(*TheJIT->getTargetData()) == sizeof(void*) &&
+           "Cross JIT'ing?");
 
     // For each jump table, map each target in the jump table to the address of
     // an emitted MachineBasicBlock.
@@ -1505,9 +1511,9 @@
   const std::vector<MachineJumpTableEntry> &JT = JumpTable->getJumpTables();
   assert(Index < JT.size() && "Invalid jump table index!");
 
-  unsigned Offset = 0;
-  unsigned EntrySize = JumpTable->getEntrySize();
+  unsigned EntrySize = JumpTable->getEntrySize(*TheJIT->getTargetData());
 
+  unsigned Offset = 0;
   for (unsigned i = 0; i < Index; ++i)
     Offset += JT[i].MBBs.size();
 
diff --git a/lib/Target/X86/AsmPrinter/X86AsmPrinter.cpp b/lib/Target/X86/AsmPrinter/X86AsmPrinter.cpp
index b79d19a..c13040a 100644
--- a/lib/Target/X86/AsmPrinter/X86AsmPrinter.cpp
+++ b/lib/Target/X86/AsmPrinter/X86AsmPrinter.cpp
@@ -488,7 +488,7 @@
 void X86AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
                                            const MachineBasicBlock *MBB,
                                            unsigned uid) const {
-  const char *JTEntryDirective = MJTI->getEntrySize() == 4 ?
+  const char *JTEntryDirective = MJTI->getEntrySize(*TM.getTargetData()) == 4 ?
     MAI->getData32bitsDirective() : MAI->getData64bitsDirective();
 
   O << JTEntryDirective << ' ';