diff --git a/lib/Target/ARM/ARMBaseInstrInfo.cpp b/lib/Target/ARM/ARMBaseInstrInfo.cpp
index 0cf85e8..d886a1f 100644
--- a/lib/Target/ARM/ARMBaseInstrInfo.cpp
+++ b/lib/Target/ARM/ARMBaseInstrInfo.cpp
@@ -540,16 +540,17 @@
 ARMBaseInstrInfo::isMoveInstr(const MachineInstr &MI,
                               unsigned &SrcReg, unsigned &DstReg,
                               unsigned& SrcSubIdx, unsigned& DstSubIdx) const {
-  SrcSubIdx = DstSubIdx = 0; // No sub-registers.
-
   switch (MI.getOpcode()) {
   default: break;
   case ARM::VMOVS:
   case ARM::VMOVD:
   case ARM::VMOVDneon:
-  case ARM::VMOVQ: {
+  case ARM::VMOVQ:
+  case ARM::VMOVQQ : {
     SrcReg = MI.getOperand(1).getReg();
     DstReg = MI.getOperand(0).getReg();
+    SrcSubIdx = MI.getOperand(1).getSubReg();
+    DstSubIdx = MI.getOperand(0).getSubReg();
     return true;
   }
   case ARM::MOVr:
@@ -564,6 +565,8 @@
            "Invalid ARM MOV instruction");
     SrcReg = MI.getOperand(1).getReg();
     DstReg = MI.getOperand(0).getReg();
+    SrcSubIdx = MI.getOperand(1).getSubReg();
+    DstSubIdx = MI.getOperand(0).getSubReg();
     return true;
   }
   }
@@ -679,6 +682,14 @@
       SrcRC == ARM::QPR_8RegisterClass)
     SrcRC = ARM::QPRRegisterClass;
 
+  // Allow QQPR / QQPR_VFP2 / QQPR_8 cross-class copies.
+  if (DestRC == ARM::QQPR_VFP2RegisterClass ||
+      DestRC == ARM::QQPR_8RegisterClass)
+    DestRC = ARM::QQPRRegisterClass;
+  if (SrcRC == ARM::QQPR_VFP2RegisterClass ||
+      SrcRC == ARM::QQPR_8RegisterClass)
+    SrcRC = ARM::QQPRRegisterClass;
+
   // Disallow copies of unequal sizes.
   if (DestRC != SrcRC && DestRC->getSize() != SrcRC->getSize())
     return false;
@@ -703,11 +714,12 @@
       Opc = ARM::VMOVDneon;
     else if (DestRC == ARM::QPRRegisterClass)
       Opc = ARM::VMOVQ;
+    else if (DestRC == ARM::QQPRRegisterClass)
+      Opc = ARM::VMOVQQ;
     else
       return false;
 
-    AddDefaultPred(BuildMI(MBB, I, DL, get(Opc), DestReg)
-                   .addReg(SrcReg));
+    AddDefaultPred(BuildMI(MBB, I, DL, get(Opc), DestReg).addReg(SrcReg));
   }
 
   return true;
@@ -748,12 +760,11 @@
     AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VSTRD))
                    .addReg(SrcReg, getKillRegState(isKill))
                    .addFrameIndex(FI).addImm(0).addMemOperand(MMO));
-  } else {
-    assert((RC == ARM::QPRRegisterClass ||
-            RC == ARM::QPR_VFP2RegisterClass ||
-            RC == ARM::QPR_8RegisterClass) && "Unknown regclass!");
+  } else if (RC == ARM::QPRRegisterClass ||
+             RC == ARM::QPR_VFP2RegisterClass ||
+             RC == ARM::QPR_8RegisterClass) {
     // FIXME: Neon instructions should support predicates
-    if (Align >= 16 && (getRegisterInfo().canRealignStack(MF))) {
+    if (Align >= 16 && getRegisterInfo().canRealignStack(MF)) {
       AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VST1q))
                      .addFrameIndex(FI).addImm(128)
                      .addMemOperand(MMO)
@@ -765,6 +776,11 @@
                      .addImm(ARM_AM::getAM5Opc(ARM_AM::ia, 4))
                      .addMemOperand(MMO));
     }
+  } else {
+    assert((RC == ARM::QQPRRegisterClass ||
+            RC == ARM::QQPR_VFP2RegisterClass ||
+            RC == ARM::QQPR_8RegisterClass) && "Unknown regclass!");
+    llvm_unreachable("Not yet implemented!");
   }
 }
 
@@ -800,12 +816,10 @@
              RC == ARM::DPR_8RegisterClass) {
     AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VLDRD), DestReg)
                    .addFrameIndex(FI).addImm(0).addMemOperand(MMO));
-  } else {
-    assert((RC == ARM::QPRRegisterClass ||
-            RC == ARM::QPR_VFP2RegisterClass ||
-            RC == ARM::QPR_8RegisterClass) && "Unknown regclass!");
-    if (Align >= 16
-        && (getRegisterInfo().canRealignStack(MF))) {
+  } else if (RC == ARM::QPRRegisterClass ||
+             RC == ARM::QPR_VFP2RegisterClass ||
+             RC == ARM::QPR_8RegisterClass) {
+    if (Align >= 16 && getRegisterInfo().canRealignStack(MF)) {
       AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VLD1q), DestReg)
                      .addFrameIndex(FI).addImm(128)
                      .addMemOperand(MMO));
@@ -815,6 +829,11 @@
                      .addImm(ARM_AM::getAM5Opc(ARM_AM::ia, 4))
                      .addMemOperand(MMO));
     }
+  } else {
+    assert((RC == ARM::QQPRRegisterClass ||
+            RC == ARM::QQPR_VFP2RegisterClass ||
+            RC == ARM::QQPR_8RegisterClass) && "Unknown regclass!");
+    llvm_unreachable("Not yet implemented!");
   }
 }
 
diff --git a/lib/Target/ARM/ARMBaseRegisterInfo.cpp b/lib/Target/ARM/ARMBaseRegisterInfo.cpp
index bc12187..bf779cc 100644
--- a/lib/Target/ARM/ARMBaseRegisterInfo.cpp
+++ b/lib/Target/ARM/ARMBaseRegisterInfo.cpp
@@ -262,7 +262,7 @@
   case 1:
   case 2:
   case 3:
-  case 4:
+  case 4: {
     // S sub-registers.
     if (A->getSize() == 8) {
       if (B == &ARM::SPR_8RegClass)
@@ -273,19 +273,48 @@
       return &ARM::DPR_VFP2RegClass;
     }
 
-    assert(A->getSize() == 16 && "Expecting a Q register class!");
+    if (A->getSize() == 16) {
+      if (B == &ARM::SPR_8RegClass)
+        return &ARM::QPR_8RegClass;
+      return &ARM::QPR_VFP2RegClass;
+    }
+
+    assert(A->getSize() == 32 && "Expecting a QQ register class!");
     if (B == &ARM::SPR_8RegClass)
-      return &ARM::QPR_8RegClass;
-    return &ARM::QPR_VFP2RegClass;
+      return &ARM::QQPR_8RegClass;
+    return &ARM::QQPR_VFP2RegClass;
+  }
   case 5:
   case 6:
+  case 7:
+  case 8: {
     // D sub-registers.
+    if (A->getSize() == 16) {
+      if (B == &ARM::DPR_VFP2RegClass)
+        return &ARM::QPR_VFP2RegClass;
+      if (B == &ARM::DPR_8RegClass)
+        return &ARM::QPR_8RegClass;
+      return A;
+    }
+
+    assert(A->getSize() == 32 && "Expecting a QQ register class!");
     if (B == &ARM::DPR_VFP2RegClass)
-      return &ARM::QPR_VFP2RegClass;
+      return &ARM::QQPR_VFP2RegClass;
     if (B == &ARM::DPR_8RegClass)
-      return &ARM::QPR_8RegClass;
+      return &ARM::QQPR_8RegClass;
     return A;
   }
+  case 9:
+  case 10: {
+    // Q sub-registers.
+    assert(A->getSize() == 32 && "Expecting a QQ register class!");
+    if (B == &ARM::QPR_VFP2RegClass)
+      return &ARM::QQPR_VFP2RegClass;
+    if (B == &ARM::QPR_8RegClass)
+      return &ARM::QQPR_8RegClass;
+    return A;
+  }
+  }
   return 0;
 }
 
diff --git a/lib/Target/ARM/ARMInstrNEON.td b/lib/Target/ARM/ARMInstrNEON.td
index d5ce2b8..9577e0b 100644
--- a/lib/Target/ARM/ARMInstrNEON.td
+++ b/lib/Target/ARM/ARMInstrNEON.td
@@ -2834,6 +2834,11 @@
 def  VMOVQ    : N3VX<0, 0, 0b10, 0b0001, 1, 1, (outs QPR:$dst), (ins QPR:$src),
                      N3RegFrm, IIC_VMOVD, "vmov", "$dst, $src", "", []>;
 
+// Pseudo vector move instruction for QQ (a pair of Q) registers. This should
+// be expanded after register allocation is completed.
+def  VMOVQQ   : PseudoInst<(outs QQPR:$dst), (ins QQPR:$src),
+                NoItinerary, "@ vmov\t$dst, $src", []>;
+
 //   VMOV     : Vector Move (Immediate)
 
 // VMOV_get_imm8 xform function: convert build_vector to VMOV.i8 imm.
diff --git a/lib/Target/ARM/ARMRegisterInfo.h b/lib/Target/ARM/ARMRegisterInfo.h
index 041afd0..f13c7d4 100644
--- a/lib/Target/ARM/ARMRegisterInfo.h
+++ b/lib/Target/ARM/ARMRegisterInfo.h
@@ -29,7 +29,8 @@
   /// ARMRegisterInfo.td file.
   enum SubregIndex {
     SSUBREG_0 = 1, SSUBREG_1 = 2, SSUBREG_2 = 3, SSUBREG_3 = 4,
-    DSUBREG_0 = 5, DSUBREG_1 = 6
+    DSUBREG_0 = 5, DSUBREG_1 = 6, DSUBREG_2 = 7, DSUBREG_3 = 8,
+    QSUBREG_0 = 9, QSUBREG_1 = 10
   };
 }
 
diff --git a/lib/Target/ARM/ARMRegisterInfo.td b/lib/Target/ARM/ARMRegisterInfo.td
index 0d4200c..29907ca 100644
--- a/lib/Target/ARM/ARMRegisterInfo.td
+++ b/lib/Target/ARM/ARMRegisterInfo.td
@@ -106,6 +106,17 @@
 def Q14 : ARMReg<14, "q14", [D28, D29]>;
 def Q15 : ARMReg<15, "q15", [D30, D31]>;
 
+// Pseudo 256-bit registers to represent pairs of Q registers. These should
+// never be present in the emitted code.
+def QQ0 : ARMReg<0, "qq0", [Q0,  Q1]>;
+def QQ1 : ARMReg<1, "qq1", [Q2,  Q3]>;
+def QQ2 : ARMReg<2, "qq2", [Q4,  Q5]>;
+def QQ3 : ARMReg<3, "qq3", [Q6,  Q7]>;
+def QQ4 : ARMReg<4, "qq4", [Q8,  Q9]>;
+def QQ5 : ARMReg<5, "qq5", [Q10, Q11]>;
+def QQ6 : ARMReg<6, "qq6", [Q12, Q13]>;
+def QQ7 : ARMReg<7, "qq7", [Q14, Q15]>;
+
 // Current Program Status Register.
 def CPSR  : ARMReg<0, "cpsr">;
 
@@ -364,6 +375,32 @@
   let SubRegClassList = [SPR_8, SPR_8, SPR_8, SPR_8, DPR_8, DPR_8];
 }
 
+// Pseudo 256-bit vector register class to model pairs of Q registers.
+def QQPR : RegisterClass<"ARM", [v4i64],
+                         256,
+                         [QQ0, QQ1, QQ2, QQ3, QQ4, QQ5, QQ6, QQ7]> {
+  let SubRegClassList = [SPR_INVALID, SPR_INVALID, SPR_INVALID, SPR_INVALID,
+                         DPR, DPR, DPR, DPR, QPR, QPR];
+}
+
+// Subset of QQPR that have 32-bit SPR subregs.
+def QQPR_VFP2 : RegisterClass<"ARM", [v4i64],
+                              256,
+                              [QQ0, QQ1, QQ2, QQ3]> {
+  let SubRegClassList = [SPR, SPR, SPR, SPR,
+                         DPR_VFP2, DPR_VFP2, DPR_VFP2, DPR_VFP2,
+                         QPR_VFP2, QPR_VFP2];
+}
+
+// Subset of QQPR that have QPR_8, DPR_8, and SPR_8 subregs.
+def QQPR_8 : RegisterClass<"ARM", [v4i64],
+                           256,
+                           [QQ0, QQ1]> {
+  let SubRegClassList = [SPR_8, SPR_8, SPR_8, SPR_8,
+                         DPR_8, DPR_8, DPR_8, DPR_8,
+                         QPR_8, QPR_8];
+}
+
 // Condition code registers.
 def CCR : RegisterClass<"ARM", [i32], 32, [CPSR]>;
 
@@ -378,6 +415,10 @@
 def arm_ssubreg_3 : PatLeaf<(i32 4)>;
 def arm_dsubreg_0 : PatLeaf<(i32 5)>;
 def arm_dsubreg_1 : PatLeaf<(i32 6)>;
+def arm_dsubreg_2 : PatLeaf<(i32 7)>;
+def arm_dsubreg_3 : PatLeaf<(i32 8)>;
+def arm_qsubreg_0 : PatLeaf<(i32 9)>;
+def arm_qsubreg_1 : PatLeaf<(i32 10)>;
 
 // S sub-registers of D registers.
 def : SubRegSet<1, [D0,  D1,  D2,  D3,  D4,  D5,  D6,  D7,
@@ -408,3 +449,31 @@
                     Q8,  Q9,  Q10, Q11, Q12, Q13, Q14, Q15],
                    [D1,  D3,  D5,  D7,  D9,  D11, D13, D15,
                     D17, D19, D21, D23, D25, D27, D29, D31]>;
+
+// S sub-registers of QQ registers. Note there are no sub-indices
+// for referencing S4 - S7, S12 - S15, and S20 - S23. It doesn't
+// look like we need them.
+def : SubRegSet<1, [QQ0, QQ1, QQ2, QQ3],
+                   [S0,  S8,  S16, S24]>;
+def : SubRegSet<2, [QQ0, QQ1, QQ2, QQ3],
+                   [S1,  S9,  S17, S25]>;
+def : SubRegSet<3, [QQ0, QQ1, QQ2, QQ3],
+                   [S2,  S10, S18, S26]>;
+def : SubRegSet<4, [QQ0, QQ1, QQ2, QQ3],
+                   [S3,  S11, S19, S27]>;
+
+// D sub-registers of QQ registers.
+def : SubRegSet<5, [QQ0, QQ1, QQ2, QQ3, QQ4, QQ5, QQ6, QQ7],
+                   [D0,  D4,  D8,  D12, D16, D20, D24, D28]>;
+def : SubRegSet<6, [QQ0, QQ1, QQ2, QQ3, QQ4, QQ5, QQ6, QQ7],
+                   [D1,  D5,  D9,  D13, D17, D21, D25, D29]>;
+def : SubRegSet<7, [QQ0, QQ1, QQ2, QQ3, QQ4, QQ5, QQ6, QQ7],
+                   [D2,  D6,  D10, D14, D18, D22, D26, D30]>;
+def : SubRegSet<8, [QQ0, QQ1, QQ2, QQ3, QQ4, QQ5, QQ6, QQ7],
+                   [D3,  D7,  D11, D15, D19, D23, D27, D31]>;
+
+// Q sub-registers of QQ registers.
+def : SubRegSet<9, [QQ0, QQ1, QQ2, QQ3, QQ4, QQ5, QQ6, QQ7],
+                   [Q0,  Q2,  Q4,  Q6,  Q8,  Q10, Q12, Q14]>;
+def : SubRegSet<10,[QQ0, QQ1, QQ2, QQ3, QQ4, QQ5, QQ6, QQ7],
+                   [Q1,  Q3,  Q5,  Q7,  Q9,  Q11, Q13, Q15]>;
diff --git a/lib/Target/X86/X86RegisterInfo.cpp b/lib/Target/X86/X86RegisterInfo.cpp
index 4f1c851..f24138a 100644
--- a/lib/Target/X86/X86RegisterInfo.cpp
+++ b/lib/Target/X86/X86RegisterInfo.cpp
@@ -716,7 +716,7 @@
 void mergeSPUpdatesUp(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI,
                       unsigned StackPtr, uint64_t *NumBytes = NULL) {
   if (MBBI == MBB.begin()) return;
-  
+
   MachineBasicBlock::iterator PI = prior(MBBI);
   unsigned Opc = PI->getOpcode();
   if ((Opc == X86::ADD64ri32 || Opc == X86::ADD64ri8 ||
diff --git a/utils/TableGen/EDEmitter.cpp b/utils/TableGen/EDEmitter.cpp
index d3bf60e..dd0924f 100644
--- a/utils/TableGen/EDEmitter.cpp
+++ b/utils/TableGen/EDEmitter.cpp
@@ -575,10 +575,11 @@
   REG("s_cc_out");
   REG("tGPR");
   REG("DPR");
-  REG("SPR");
-  REG("QPR");
   REG("DPR_VFP2");
   REG("DPR_8");
+  REG("SPR");
+  REG("QPR");
+  REG("QQPR");
   
   IMM("i32imm");
   IMM("bf_inv_mask_imm");