- Add pseudo instructions tLDRpci_pic and t2LDRpci_pic which does a pc-relative

  load of a GV from constantpool and then add pc. It allows the code sequence to
  be rematerializable so it would be hoisted by machine licm.
- Add a late pass to break these pseudo instructions into a number of real
  instructions. Also move the code in Thumb2 IT pass that breaks up t2MOVi32imm
  to this pass. This is done before post regalloc scheduling to allow the
  scheduler to proper schedule these instructions. It also allow them to be
  if-converted and shrunk by later passes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86304 91177308-0d34-0410-b5e6-96231b3b80d8

13 files changed, 253 insertions, 55 deletions

diff --git a/lib/Target/ARM/ARM.h b/lib/Target/ARM/ARM.h
index 76cc06e..21445ad 100644
--- a/lib/Target/ARM/ARM.h
+++ b/lib/Target/ARM/ARM.h
@@ -103,6 +103,7 @@ FunctionPass *createARMObjectCodeEmitterPass(ARMBaseTargetMachine &TM,
                                              ObjectCodeEmitter &OCE);
 
 FunctionPass *createARMLoadStoreOptimizationPass(bool PreAlloc = false);
+FunctionPass *createARMExpandPseudoPass();
 FunctionPass *createARMConstantIslandPass();
 FunctionPass *createNEONPreAllocPass();
 FunctionPass *createNEONMoveFixPass();
diff --git a/lib/Target/ARM/ARMBaseInstrInfo.h b/lib/Target/ARM/ARMBaseInstrInfo.h
index 2ba3774..be81beb 100644
--- a/lib/Target/ARM/ARMBaseInstrInfo.h
+++ b/lib/Target/ARM/ARMBaseInstrInfo.h
@@ -261,9 +261,8 @@ public:
 
   virtual MachineInstr* foldMemoryOperandImpl(MachineFunction &MF,
                                               MachineInstr* MI,
-                                              const SmallVectorImpl<unsigned> &Ops,
+                                           const SmallVectorImpl<unsigned> &Ops,
                                               MachineInstr* LoadMI) const;
-
 };
 
 static inline
diff --git a/lib/Target/ARM/ARMExpandPseudoInsts.cpp b/lib/Target/ARM/ARMExpandPseudoInsts.cpp
new file mode 100644
index 0000000..4d0f899
--- /dev/null
+++ b/lib/Target/ARM/ARMExpandPseudoInsts.cpp
@@ -0,0 +1,115 @@
+//===-- ARMExpandPseudoInsts.cpp - Expand pseudo instructions -----*- C++ -*-=//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains a pass that expand pseudo instructions into target
+// instructions to allow proper scheduling, if-conversion, and other late
+// optimizations. This pass should be run after register allocation but before
+// post- regalloc scheduling pass.
+//
+//===----------------------------------------------------------------------===//
+
+#define DEBUG_TYPE "arm-pseudo"
+#include "ARM.h"
+#include "ARMBaseInstrInfo.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+
+using namespace llvm;
+
+namespace {
+  class ARMExpandPseudo : public MachineFunctionPass {
+  public:
+    static char ID;
+    ARMExpandPseudo() : MachineFunctionPass(&ID) {}
+
+    const TargetInstrInfo *TII;
+
+    virtual bool runOnMachineFunction(MachineFunction &Fn);
+
+    virtual const char *getPassName() const {
+      return "ARM pseudo instruction expansion pass";
+    }
+
+  private:
+    bool ExpandMBB(MachineBasicBlock &MBB);
+  };
+  char ARMExpandPseudo::ID = 0;
+}
+
+bool ARMExpandPseudo::ExpandMBB(MachineBasicBlock &MBB) {
+  bool Modified = false;
+
+  MachineBasicBlock::iterator MBBI = MBB.begin(), E = MBB.end();
+  while (MBBI != E) {
+    MachineInstr &MI = *MBBI;
+    MachineBasicBlock::iterator NMBBI = next(MBBI);
+
+    unsigned Opcode = MI.getOpcode();
+    switch (Opcode) {
+    default: break;
+    case ARM::tLDRpci_pic: 
+    case ARM::t2LDRpci_pic: {
+      unsigned NewLdOpc = (Opcode == ARM::tLDRpci_pic)
+        ? ARM::tLDRpci : ARM::t2LDRpci;
+      unsigned DstReg = MI.getOperand(0).getReg();
+      if (!MI.getOperand(0).isDead()) {
+        MachineInstr *NewMI =
+          AddDefaultPred(BuildMI(MBB, MBBI, MI.getDebugLoc(),
+                                 TII->get(NewLdOpc), DstReg)
+                         .addOperand(MI.getOperand(1)));
+        NewMI->setMemRefs(MI.memoperands_begin(), MI.memoperands_end());
+        BuildMI(MBB, MBBI, MI.getDebugLoc(), TII->get(ARM::tPICADD))
+          .addReg(DstReg, getDefRegState(true))
+          .addReg(DstReg)
+          .addOperand(MI.getOperand(2));
+      }
+      MI.eraseFromParent();
+      Modified = true;
+      break;
+    }
+    case ARM::t2MOVi32imm: {
+      unsigned DstReg = MI.getOperand(0).getReg();
+      unsigned Imm = MI.getOperand(1).getImm();
+      unsigned Lo16 = Imm & 0xffff;
+      unsigned Hi16 = (Imm >> 16) & 0xffff;
+      if (!MI.getOperand(0).isDead()) {
+        AddDefaultPred(BuildMI(MBB, MBBI, MI.getDebugLoc(),
+                               TII->get(ARM::t2MOVi16), DstReg)
+                       .addImm(Lo16));
+        AddDefaultPred(BuildMI(MBB, MBBI, MI.getDebugLoc(),
+                               TII->get(ARM::t2MOVTi16))
+                       .addReg(DstReg, getDefRegState(true))
+                       .addReg(DstReg).addImm(Hi16));
+      }
+      MI.eraseFromParent();
+      Modified = true;
+    }
+    // FIXME: expand t2MOVi32imm
+    }
+    MBBI = NMBBI;
+  }
+
+  return Modified;
+}
+
+bool ARMExpandPseudo::runOnMachineFunction(MachineFunction &MF) {
+  TII = MF.getTarget().getInstrInfo();
+
+  bool Modified = false;
+  for (MachineFunction::iterator MFI = MF.begin(), E = MF.end(); MFI != E;
+       ++MFI)
+    Modified |= ExpandMBB(*MFI);
+  return Modified;
+}
+
+/// createARMExpandPseudoPass - returns an instance of the pseudo instruction
+/// expansion pass.
+FunctionPass *llvm::createARMExpandPseudoPass() {
+  return new ARMExpandPseudo();
+}
diff --git a/lib/Target/ARM/ARMInstrInfo.cpp b/lib/Target/ARM/ARMInstrInfo.cpp
index 86bbe2a..d3cbb68 100644
--- a/lib/Target/ARM/ARMInstrInfo.cpp
+++ b/lib/Target/ARM/ARMInstrInfo.cpp
@@ -85,17 +85,24 @@ reMaterialize(MachineBasicBlock &MBB,
               unsigned DestReg, unsigned SubIdx,
               const MachineInstr *Orig) const {
   DebugLoc dl = Orig->getDebugLoc();
-  if (Orig->getOpcode() == ARM::MOVi2pieces) {
+  unsigned Opcode = Orig->getOpcode();
+  switch (Opcode) {
+  default: {
+    MachineInstr *MI = MBB.getParent()->CloneMachineInstr(Orig);
+    MI->getOperand(0).setReg(DestReg);
+    MBB.insert(I, MI);
+    break;
+  }
+  case ARM::MOVi2pieces:
     RI.emitLoadConstPool(MBB, I, dl,
                          DestReg, SubIdx,
                          Orig->getOperand(1).getImm(),
                          (ARMCC::CondCodes)Orig->getOperand(2).getImm(),
                          Orig->getOperand(3).getReg());
-    return;
+    break;
   }
 
-  MachineInstr *MI = MBB.getParent()->CloneMachineInstr(Orig);
-  MI->getOperand(0).setReg(DestReg);
-  MBB.insert(I, MI);
+  MachineInstr *NewMI = prior(I);
+  NewMI->getOperand(0).setSubReg(SubIdx);
 }
 
diff --git a/lib/Target/ARM/ARMInstrInfo.h b/lib/Target/ARM/ARMInstrInfo.h
index 5d1678d..9b9c0c7 100644
--- a/lib/Target/ARM/ARMInstrInfo.h
+++ b/lib/Target/ARM/ARMInstrInfo.h
@@ -35,15 +35,15 @@ public:
   // Return true if the block does not fall through.
   bool BlockHasNoFallThrough(const MachineBasicBlock &MBB) const;
 
+  void reMaterialize(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
+                     unsigned DestReg, unsigned SubIdx,
+                     const MachineInstr *Orig) const;
+
   /// getRegisterInfo - TargetInstrInfo is a superset of MRegister info.  As
   /// such, whenever a client has an instance of instruction info, it should
   /// always be able to get register info as well (through this method).
   ///
   const ARMRegisterInfo &getRegisterInfo() const { return RI; }
-
-  void reMaterialize(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
-                     unsigned DestReg, unsigned SubIdx,
-                     const MachineInstr *Orig) const;
 };
 
 }
diff --git a/lib/Target/ARM/ARMInstrThumb.td b/lib/Target/ARM/ARMInstrThumb.td
index 5d02925..2796364 100644
--- a/lib/Target/ARM/ARMInstrThumb.td
+++ b/lib/Target/ARM/ARMInstrThumb.td
@@ -740,3 +740,13 @@ def : T1Pat<(i32 thumb_immshifted:$src),
 
 def : T1Pat<(i32 imm0_255_comp:$src),
             (tMVN (tMOVi8 (imm_comp_XFORM imm:$src)))>;
+
+// Pseudo instruction that combines ldr from constpool and add pc. This should
+// be expanded into two instructions late to allow if-conversion and
+// scheduling.
+let isReMaterializable = 1 in
+def tLDRpci_pic : PseudoInst<(outs GPR:$dst), (ins i32imm:$addr, pclabel:$cp),
+                   NoItinerary, "@ ldr.n\t$dst, $addr\n$cp:\n\tadd\t$dst, pc",
+               [(set GPR:$dst, (ARMpic_add (load (ARMWrapper tconstpool:$addr)),
+                                           imm:$cp))]>,
+               Requires<[IsThumb1Only]>;
diff --git a/lib/Target/ARM/ARMInstrThumb2.td b/lib/Target/ARM/ARMInstrThumb2.td
index 5bfda37..1bb9bfd 100644
--- a/lib/Target/ARM/ARMInstrThumb2.td
+++ b/lib/Target/ARM/ARMInstrThumb2.td
@@ -1179,3 +1179,13 @@ let isReMaterializable = 1 in
 def t2MOVi32imm : T2Ix2<(outs GPR:$dst), (ins i32imm:$src), IIC_iMOVi,
                    "movw", "\t$dst, ${src:lo16}\n\tmovt${p}\t$dst, ${src:hi16}",
                      [(set GPR:$dst, (i32 imm:$src))]>;
+
+// Pseudo instruction that combines ldr from constpool and add pc. This should
+// be expanded into two instructions late to allow if-conversion and
+// scheduling.
+let isReMaterializable = 1 in
+def t2LDRpci_pic : PseudoInst<(outs GPR:$dst), (ins i32imm:$addr, pclabel:$cp),
+                   NoItinerary, "@ ldr.w\t$dst, $addr\n$cp:\n\tadd\t$dst, pc",
+               [(set GPR:$dst, (ARMpic_add (load (ARMWrapper tconstpool:$addr)),
+                                           imm:$cp))]>,
+               Requires<[IsThumb2]>;
diff --git a/lib/Target/ARM/ARMTargetMachine.cpp b/lib/Target/ARM/ARMTargetMachine.cpp
index ceb0505..b8952ea 100644
--- a/lib/Target/ARM/ARMTargetMachine.cpp
+++ b/lib/Target/ARM/ARMTargetMachine.cpp
@@ -105,6 +105,10 @@ bool ARMBaseTargetMachine::addPreSched2(PassManagerBase &PM,
   if (OptLevel != CodeGenOpt::None && !Subtarget.isThumb1Only())
     PM.add(createARMLoadStoreOptimizationPass());
 
+  // Expand some pseudo instructions into multiple instructions to allow
+  // proper scheduling.
+  PM.add(createARMExpandPseudoPass());
+
   return true;
 }
 
diff --git a/lib/Target/ARM/Thumb1InstrInfo.cpp b/lib/Target/ARM/Thumb1InstrInfo.cpp
index b6dd56c..4e4561d 100644
--- a/lib/Target/ARM/Thumb1InstrInfo.cpp
+++ b/lib/Target/ARM/Thumb1InstrInfo.cpp
@@ -11,10 +11,13 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "ARMInstrInfo.h"
+#include "Thumb1InstrInfo.h"
 #include "ARM.h"
+#include "ARMConstantPoolValue.h"
 #include "ARMGenInstrInfo.inc"
 #include "ARMMachineFunctionInfo.h"
+#include "llvm/GlobalValue.h"
+#include "llvm/CodeGen/MachineConstantPool.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
 #include "llvm/CodeGen/MachineMemOperand.h"
@@ -263,3 +266,44 @@ foldMemoryOperandImpl(MachineFunction &MF, MachineInstr *MI,
 
   return NewMI;
 }
+
+void Thumb1InstrInfo::reMaterialize(MachineBasicBlock &MBB,
+                                    MachineBasicBlock::iterator I,
+                                    unsigned DestReg, unsigned SubIdx,
+                                    const MachineInstr *Orig) const {
+  DebugLoc dl = Orig->getDebugLoc();
+  unsigned Opcode = Orig->getOpcode();
+  switch (Opcode) {
+  default: {
+    MachineInstr *MI = MBB.getParent()->CloneMachineInstr(Orig);
+    MI->getOperand(0).setReg(DestReg);
+    MBB.insert(I, MI);
+    break;
+  }
+  case ARM::tLDRpci_pic: {
+    MachineFunction &MF = *MBB.getParent();
+    ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
+    MachineConstantPool *MCP = MF.getConstantPool();
+    unsigned CPI = Orig->getOperand(1).getIndex();
+    const MachineConstantPoolEntry &MCPE = MCP->getConstants()[CPI];
+    assert(MCPE.isMachineConstantPoolEntry() &&
+           "Expecting a machine constantpool entry!");
+    ARMConstantPoolValue *ACPV =
+      static_cast<ARMConstantPoolValue*>(MCPE.Val.MachineCPVal);
+    assert(ACPV->isGlobalValue() && "Expecting a GV!");
+    unsigned PCLabelId = AFI->createConstPoolEntryUId();
+    ARMConstantPoolValue *NewCPV =
+      new ARMConstantPoolValue(ACPV->getGV(), PCLabelId, ARMCP::CPValue, 4);
+    CPI = MCP->getConstantPoolIndex(NewCPV, MCPE.getAlignment());
+    MachineInstrBuilder MIB = BuildMI(MBB, I, Orig->getDebugLoc(), get(Opcode),
+                                      DestReg)
+      .addConstantPoolIndex(CPI).addImm(PCLabelId);
+    (*MIB).setMemRefs(Orig->memoperands_begin(), Orig->memoperands_end());
+    break;
+  }
+  }
+
+  MachineInstr *NewMI = prior(I);
+  NewMI->getOperand(0).setSubReg(SubIdx);
+}
+
diff --git a/lib/Target/ARM/Thumb1InstrInfo.h b/lib/Target/ARM/Thumb1InstrInfo.h
index 13cc578..806dddd 100644
--- a/lib/Target/ARM/Thumb1InstrInfo.h
+++ b/lib/Target/ARM/Thumb1InstrInfo.h
@@ -76,6 +76,10 @@ public:
                                       MachineInstr* LoadMI) const {
     return 0;
   }
+
+  void reMaterialize(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
+                     unsigned DestReg, unsigned SubIdx,
+                     const MachineInstr *Orig) const;
 };
 }
 
diff --git a/lib/Target/ARM/Thumb2ITBlockPass.cpp b/lib/Target/ARM/Thumb2ITBlockPass.cpp
index 462844b..cbf2946 100644
--- a/lib/Target/ARM/Thumb2ITBlockPass.cpp
+++ b/lib/Target/ARM/Thumb2ITBlockPass.cpp
@@ -34,10 +34,6 @@ namespace {
     }
 
   private:
-    MachineBasicBlock::iterator
-      SplitT2MOV32imm(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI,
-                      MachineInstr *MI, DebugLoc dl,
-                      unsigned PredReg, ARMCC::CondCodes CC);
     bool InsertITBlocks(MachineBasicBlock &MBB);
   };
   char Thumb2ITBlockPass::ID = 0;
@@ -50,34 +46,6 @@ static ARMCC::CondCodes getPredicate(const MachineInstr *MI, unsigned &PredReg){
   return llvm::getInstrPredicate(MI, PredReg);
 }
 
-MachineBasicBlock::iterator
-Thumb2ITBlockPass::SplitT2MOV32imm(MachineBasicBlock &MBB,
-                                   MachineBasicBlock::iterator MBBI,
-                                   MachineInstr *MI,
-                                   DebugLoc dl, unsigned PredReg,
-                                   ARMCC::CondCodes CC) {
-  // Splitting t2MOVi32imm into a pair of t2MOVi16 + t2MOVTi16 here.
-  // The only reason it was a single instruction was so it could be
-  // re-materialized. We want to split it before this and the thumb2
-  // size reduction pass to make sure the IT mask is correct and expose
-  // width reduction opportunities. It doesn't make sense to do this in a 
-  // separate pass so here it is.
-  unsigned DstReg = MI->getOperand(0).getReg();
-  bool DstDead = MI->getOperand(0).isDead(); // Is this possible?
-  unsigned Imm = MI->getOperand(1).getImm();
-  unsigned Lo16 = Imm & 0xffff;
-  unsigned Hi16 = (Imm >> 16) & 0xffff;
-  BuildMI(MBB, MBBI, dl, TII->get(ARM::t2MOVi16), DstReg)
-    .addImm(Lo16).addImm(CC).addReg(PredReg);
-  BuildMI(MBB, MBBI, dl, TII->get(ARM::t2MOVTi16))
-    .addReg(DstReg, getDefRegState(true) | getDeadRegState(DstDead))
-    .addReg(DstReg).addImm(Hi16).addImm(CC).addReg(PredReg);
-  --MBBI;
-  --MBBI;
-  MI->eraseFromParent();
-  return MBBI;
-}
-
 bool Thumb2ITBlockPass::InsertITBlocks(MachineBasicBlock &MBB) {
   bool Modified = false;
 
@@ -88,11 +56,6 @@ bool Thumb2ITBlockPass::InsertITBlocks(MachineBasicBlock &MBB) {
     unsigned PredReg = 0;
     ARMCC::CondCodes CC = getPredicate(MI, PredReg);
 
-    if (MI->getOpcode() == ARM::t2MOVi32imm) {
-      MBBI = SplitT2MOV32imm(MBB, MBBI, MI, dl, PredReg, CC);
-      continue;
-    }
-
     if (CC == ARMCC::AL) {
       ++MBBI;
       continue;
@@ -115,11 +78,6 @@ bool Thumb2ITBlockPass::InsertITBlocks(MachineBasicBlock &MBB) {
       DebugLoc ndl = NMI->getDebugLoc();
       unsigned NPredReg = 0;
       ARMCC::CondCodes NCC = getPredicate(NMI, NPredReg);
-      if (NMI->getOpcode() == ARM::t2MOVi32imm) {
-        MBBI = SplitT2MOV32imm(MBB, MBBI, NMI, ndl, NPredReg, NCC);
-        continue;
-      }
-
       if (NCC == OCC) {
         Mask |= (1 << Pos);
       } else if (NCC != CC)
diff --git a/lib/Target/ARM/Thumb2InstrInfo.cpp b/lib/Target/ARM/Thumb2InstrInfo.cpp
index 21fff51..da8ceb4 100644
--- a/lib/Target/ARM/Thumb2InstrInfo.cpp
+++ b/lib/Target/ARM/Thumb2InstrInfo.cpp
@@ -11,11 +11,14 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "ARMInstrInfo.h"
+#include "Thumb2InstrInfo.h"
 #include "ARM.h"
+#include "ARMConstantPoolValue.h"
 #include "ARMAddressingModes.h"
 #include "ARMGenInstrInfo.inc"
 #include "ARMMachineFunctionInfo.h"
+#include "llvm/GlobalValue.h"
+#include "llvm/CodeGen/MachineConstantPool.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
 #include "llvm/CodeGen/MachineMemOperand.h"
@@ -132,6 +135,45 @@ loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
   ARMBaseInstrInfo::loadRegFromStackSlot(MBB, I, DestReg, FI, RC);
 }
 
+void Thumb2InstrInfo::reMaterialize(MachineBasicBlock &MBB,
+                                    MachineBasicBlock::iterator I,
+                                    unsigned DestReg, unsigned SubIdx,
+                                    const MachineInstr *Orig) const {
+  DebugLoc dl = Orig->getDebugLoc();
+  unsigned Opcode = Orig->getOpcode();
+  switch (Opcode) {
+  default: {
+    MachineInstr *MI = MBB.getParent()->CloneMachineInstr(Orig);
+    MI->getOperand(0).setReg(DestReg);
+    MBB.insert(I, MI);
+    break;
+  }
+  case ARM::t2LDRpci_pic: {
+    MachineFunction &MF = *MBB.getParent();
+    ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
+    MachineConstantPool *MCP = MF.getConstantPool();
+    unsigned CPI = Orig->getOperand(1).getIndex();
+    const MachineConstantPoolEntry &MCPE = MCP->getConstants()[CPI];
+    assert(MCPE.isMachineConstantPoolEntry() &&
+           "Expecting a machine constantpool entry!");
+    ARMConstantPoolValue *ACPV =
+      static_cast<ARMConstantPoolValue*>(MCPE.Val.MachineCPVal);
+    assert(ACPV->isGlobalValue() && "Expecting a GV!");
+    unsigned PCLabelId = AFI->createConstPoolEntryUId();
+    ARMConstantPoolValue *NewCPV =
+      new ARMConstantPoolValue(ACPV->getGV(), PCLabelId, ARMCP::CPValue, 4);
+    CPI = MCP->getConstantPoolIndex(NewCPV, MCPE.getAlignment());
+    MachineInstrBuilder MIB = BuildMI(MBB, I, Orig->getDebugLoc(), get(Opcode),
+                                      DestReg)
+      .addConstantPoolIndex(CPI).addImm(PCLabelId);
+    (*MIB).setMemRefs(Orig->memoperands_begin(), Orig->memoperands_end());
+    break;
+  }
+  }
+
+  MachineInstr *NewMI = prior(I);
+  NewMI->getOperand(0).setSubReg(SubIdx);
+}
 
 void llvm::emitT2RegPlusImmediate(MachineBasicBlock &MBB,
                                MachineBasicBlock::iterator &MBBI, DebugLoc dl,
diff --git a/lib/Target/ARM/Thumb2InstrInfo.h b/lib/Target/ARM/Thumb2InstrInfo.h
index f3688c0..0518977 100644
--- a/lib/Target/ARM/Thumb2InstrInfo.h
+++ b/lib/Target/ARM/Thumb2InstrInfo.h
@@ -50,6 +50,10 @@ public:
                             unsigned DestReg, int FrameIndex,
                             const TargetRegisterClass *RC) const;
 
+  void reMaterialize(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
+                     unsigned DestReg, unsigned SubIdx,
+                     const MachineInstr *Orig) const;
+
   /// getRegisterInfo - TargetInstrInfo is a superset of MRegister info.  As
   /// such, whenever a client has an instance of instruction info, it should
   /// always be able to get register info as well (through this method).