diff --git a/compiler/dex/quick/x86/assemble_x86.cc b/compiler/dex/quick/x86/assemble_x86.cc
index 39a0365..c383296 100644
--- a/compiler/dex/quick/x86/assemble_x86.cc
+++ b/compiler/dex/quick/x86/assemble_x86.cc
@@ -317,6 +317,7 @@
 #undef UNARY_ENCODING_MAP
 
   { kx86Cdq32Da, kRegOpcode, NO_OPERAND | REG_DEFAD_USEA,                                  { 0, 0, 0x99, 0, 0, 0, 0, 0 }, "Cdq", "" },
+  { kx86Cqo64Da, kRegOpcode, NO_OPERAND | REG_DEFAD_USEA,                                  { REX_W, 0, 0x99, 0, 0, 0, 0, 0 }, "Cqo", "" },
   { kX86Bswap32R, kRegOpcode, IS_UNARY_OP | REG_DEF0_USE0,                                 { 0, 0, 0x0F, 0xC8, 0, 0, 0, 0 }, "Bswap32R", "!0r" },
   { kX86Push32R,  kRegOpcode, IS_UNARY_OP | REG_USE0 | REG_USE_SP | REG_DEF_SP | IS_STORE, { 0, 0, 0x50, 0,    0, 0, 0, 0 }, "Push32R",  "!0r" },
   { kX86Pop32R,   kRegOpcode, IS_UNARY_OP | REG_DEF0 | REG_USE_SP | REG_DEF_SP | IS_LOAD,  { 0, 0, 0x58, 0,    0, 0, 0, 0 }, "Pop32R",   "!0r" },
@@ -326,6 +327,11 @@
 { kX86 ## opname ## RM, kRegMem,   IS_LOAD | IS_TERTIARY_OP | reg_def | REG_USE1,  { prefix, 0, 0x0F, opcode, 0, 0, 0, 0 }, #opname "RM", "!0r,[!1r+!2d]" }, \
 { kX86 ## opname ## RA, kRegArray, IS_LOAD | IS_QUIN_OP     | reg_def | REG_USE12, { prefix, 0, 0x0F, opcode, 0, 0, 0, 0 }, #opname "RA", "!0r,[!1r+!2r<<!3d+!4d]" }
 
+#define EXT_0F_REX_W_ENCODING_MAP(opname, prefix, opcode, reg_def) \
+{ kX86 ## opname ## RR, kRegReg,             IS_BINARY_OP   | reg_def | REG_USE1,  { prefix, REX_W, 0x0F, opcode, 0, 0, 0, 0 }, #opname "RR", "!0r,!1r" }, \
+{ kX86 ## opname ## RM, kRegMem,   IS_LOAD | IS_TERTIARY_OP | reg_def | REG_USE1,  { prefix, REX_W, 0x0F, opcode, 0, 0, 0, 0 }, #opname "RM", "!0r,[!1r+!2d]" }, \
+{ kX86 ## opname ## RA, kRegArray, IS_LOAD | IS_QUIN_OP     | reg_def | REG_USE12, { prefix, REX_W, 0x0F, opcode, 0, 0, 0, 0 }, #opname "RA", "!0r,[!1r+!2r<<!3d+!4d]" }
+
 #define EXT_0F_ENCODING2_MAP(opname, prefix, opcode, opcode2, reg_def) \
 { kX86 ## opname ## RR, kRegReg,             IS_BINARY_OP   | reg_def | REG_USE1,  { prefix, 0, 0x0F, opcode, opcode2, 0, 0, 0 }, #opname "RR", "!0r,!1r" }, \
 { kX86 ## opname ## RM, kRegMem,   IS_LOAD | IS_TERTIARY_OP | reg_def | REG_USE1,  { prefix, 0, 0x0F, opcode, opcode2, 0, 0, 0 }, #opname "RM", "!0r,[!1r+!2d]" }, \
@@ -341,8 +347,12 @@
 
   EXT_0F_ENCODING_MAP(Cvtsi2sd,  0xF2, 0x2A, REG_DEF0),
   EXT_0F_ENCODING_MAP(Cvtsi2ss,  0xF3, 0x2A, REG_DEF0),
+  EXT_0F_REX_W_ENCODING_MAP(Cvtsqi2sd,  0xF2, 0x2A, REG_DEF0),
+  EXT_0F_REX_W_ENCODING_MAP(Cvtsqi2ss,  0xF3, 0x2A, REG_DEF0),
   EXT_0F_ENCODING_MAP(Cvttsd2si, 0xF2, 0x2C, REG_DEF0),
   EXT_0F_ENCODING_MAP(Cvttss2si, 0xF3, 0x2C, REG_DEF0),
+  EXT_0F_REX_W_ENCODING_MAP(Cvttsd2sqi, 0xF2, 0x2C, REG_DEF0),
+  EXT_0F_REX_W_ENCODING_MAP(Cvttss2sqi, 0xF3, 0x2C, REG_DEF0),
   EXT_0F_ENCODING_MAP(Cvtsd2si,  0xF2, 0x2D, REG_DEF0),
   EXT_0F_ENCODING_MAP(Cvtss2si,  0xF3, 0x2D, REG_DEF0),
   EXT_0F_ENCODING_MAP(Ucomisd,   0x66, 0x2E, SETS_CCODES|REG_USE0),
@@ -428,10 +438,19 @@
   { kX86MovhpsAR, kArrayReg,    IS_STORE | IS_QUIN_OP     | REG_USE014, { 0x0, 0, 0x0F, 0x17, 0, 0, 0, 0 }, "MovhpsAR", "[!0r+!1r<<!2d+!3d],!4r" },
 
   EXT_0F_ENCODING_MAP(Movdxr,    0x66, 0x6E, REG_DEF0),
+  EXT_0F_REX_W_ENCODING_MAP(Movqxr, 0x66, 0x6E, REG_DEF0),
+  { kX86MovqrxRR, kRegRegStore, IS_BINARY_OP | REG_DEF0   | REG_USE1,   { 0x66, REX_W, 0x0F, 0x7E, 0, 0, 0, 0 }, "MovqrxRR", "!0r,!1r" },
+  { kX86MovqrxMR, kMemReg,      IS_STORE | IS_TERTIARY_OP | REG_USE02,  { 0x66, REX_W, 0x0F, 0x7E, 0, 0, 0, 0 }, "MovqrxMR", "[!0r+!1d],!2r" },
+  { kX86MovqrxAR, kArrayReg,    IS_STORE | IS_QUIN_OP     | REG_USE014, { 0x66, REX_W, 0x0F, 0x7E, 0, 0, 0, 0 }, "MovqrxAR", "[!0r+!1r<<!2d+!3d],!4r" },
+
   { kX86MovdrxRR, kRegRegStore, IS_BINARY_OP | REG_DEF0   | REG_USE1,   { 0x66, 0, 0x0F, 0x7E, 0, 0, 0, 0 }, "MovdrxRR", "!0r,!1r" },
   { kX86MovdrxMR, kMemReg,      IS_STORE | IS_TERTIARY_OP | REG_USE02,  { 0x66, 0, 0x0F, 0x7E, 0, 0, 0, 0 }, "MovdrxMR", "[!0r+!1d],!2r" },
   { kX86MovdrxAR, kArrayReg,    IS_STORE | IS_QUIN_OP     | REG_USE014, { 0x66, 0, 0x0F, 0x7E, 0, 0, 0, 0 }, "MovdrxAR", "[!0r+!1r<<!2d+!3d],!4r" },
 
+  { kX86MovsxdRR, kRegReg,      IS_BINARY_OP | REG_DEF0 | REG_USE1,              { REX_W, 0, 0x63, 0, 0, 0, 0, 0 }, "MovsxdRR", "!0r,!1r" },
+  { kX86MovsxdRM, kRegMem,      IS_LOAD | IS_TERTIARY_OP | REG_DEF0 | REG_USE1,  { REX_W, 0, 0x63, 0, 0, 0, 0, 0 }, "MovsxdRM", "!0r,[!1r+!2d]" },
+  { kX86MovsxdRA, kRegArray,    IS_LOAD | IS_QUIN_OP     | REG_DEF0 | REG_USE12, { REX_W, 0, 0x63, 0, 0, 0, 0, 0 }, "MovsxdRA", "!0r,[!1r+!2r<<!3d+!4d]" },
+
   { kX86Set8R, kRegCond,              IS_BINARY_OP   | REG_DEF0  | USES_CCODES, { 0, 0, 0x0F, 0x90, 0, 0, 0, 0 }, "Set8R", "!1c !0r" },
   { kX86Set8M, kMemCond,   IS_STORE | IS_TERTIARY_OP | REG_USE0  | USES_CCODES, { 0, 0, 0x0F, 0x90, 0, 0, 0, 0 }, "Set8M", "!2c [!0r+!1d]" },
   { kX86Set8A, kArrayCond, IS_STORE | IS_QUIN_OP     | REG_USE01 | USES_CCODES, { 0, 0, 0x0F, 0x90, 0, 0, 0, 0 }, "Set8A", "!4c [!0r+!1r<<!2d+!3d]" },
@@ -442,6 +461,7 @@
 
   EXT_0F_ENCODING_MAP(Imul16,  0x66, 0xAF, REG_USE0 | REG_DEF0 | SETS_CCODES),
   EXT_0F_ENCODING_MAP(Imul32,  0x00, 0xAF, REG_USE0 | REG_DEF0 | SETS_CCODES),
+  EXT_0F_ENCODING_MAP(Imul64,  REX_W, 0xAF, REG_USE0 | REG_DEF0 | SETS_CCODES),
 
   { kX86CmpxchgRR, kRegRegStore, IS_BINARY_OP | REG_DEF0 | REG_USE01 | REG_DEFA_USEA | SETS_CCODES, { 0, 0, 0x0F, 0xB1, 0, 0, 0, 0 }, "Cmpxchg", "!0r,!1r" },
   { kX86CmpxchgMR, kMemReg,   IS_STORE | IS_TERTIARY_OP | REG_USE02 | REG_DEFA_USEA | SETS_CCODES, { 0, 0, 0x0F, 0xB1, 0, 0, 0, 0 }, "Cmpxchg", "[!0r+!1d],!2r" },
@@ -507,7 +527,7 @@
   }
   if (displacement != 0 || LowRegisterBits(RegStorage::RegNum(base)) == rs_rBP.GetRegNum()) {
     // BP requires an explicit displacement, even when it's 0.
-    if (entry->opcode != kX86Lea32RA) {
+    if (entry->opcode != kX86Lea32RA && entry->opcode != kX86Lea64RA) {
       DCHECK_NE(entry->flags & (IS_LOAD | IS_STORE), 0ULL) << entry->name;
     }
     size += IS_SIMM8(displacement) ? 1 : 4;
@@ -676,7 +696,7 @@
     case kMacro:  // lir operands - 0: reg
       DCHECK_EQ(lir->opcode, static_cast<int>(kX86StartOfMethod));
       return 5 /* call opcode + 4 byte displacement */ + 1 /* pop reg */ +
-          ComputeSize(&X86Mir2Lir::EncodingMap[kX86Sub32RI], 0, 0,
+          ComputeSize(&X86Mir2Lir::EncodingMap[Gen64Bit() ? kX86Sub64RI : kX86Sub32RI], 0, 0,
                       lir->operands[0], NO_REG, false) -
           // shorter ax encoding
           (RegStorage::RegNum(lir->operands[0]) == rs_rAX.GetRegNum()  ? 1 : 0);
@@ -1408,8 +1428,8 @@
   DCHECK_LT(RegStorage::RegNum(reg), 8);
   code_buffer_.push_back(0x58 + RegStorage::RegNum(reg));  // pop reg
 
-  EmitRegImm(&X86Mir2Lir::EncodingMap[kX86Sub32RI], RegStorage::RegNum(reg),
-             offset + 5 /* size of call +0 */);
+  EmitRegImm(&X86Mir2Lir::EncodingMap[Gen64Bit() ? kX86Sub64RI : kX86Sub32RI],
+             RegStorage::RegNum(reg), offset + 5 /* size of call +0 */);
 }
 
 void X86Mir2Lir::EmitUnimplemented(const X86EncodingMap* entry, LIR* lir) {
diff --git a/compiler/dex/quick/x86/call_x86.cc b/compiler/dex/quick/x86/call_x86.cc
index fc0b305..f5fce34 100644
--- a/compiler/dex/quick/x86/call_x86.cc
+++ b/compiler/dex/quick/x86/call_x86.cc
@@ -86,11 +86,19 @@
   if (base_of_code_ != nullptr) {
     // We can use the saved value.
     RegLocation rl_method = mir_graph_->GetRegLocation(base_of_code_->s_reg_low);
-    rl_method = LoadValue(rl_method, kCoreReg);
+    if (rl_method.wide) {
+      rl_method = LoadValueWide(rl_method, kCoreReg);
+    } else {
+      rl_method = LoadValue(rl_method, kCoreReg);
+    }
     start_of_method_reg = rl_method.reg;
     store_method_addr_used_ = true;
   } else {
-    start_of_method_reg = AllocTemp();
+    if (Gen64Bit()) {
+      start_of_method_reg = AllocTempWide();
+    } else {
+      start_of_method_reg = AllocTemp();
+    }
     NewLIR1(kX86StartOfMethod, start_of_method_reg.GetReg());
   }
   int low_key = s4FromSwitchData(&table[2]);
@@ -108,9 +116,14 @@
 
   // Load the displacement from the switch table
   RegStorage disp_reg = AllocTemp();
-  NewLIR5(kX86PcRelLoadRA, disp_reg.GetReg(), start_of_method_reg.GetReg(), keyReg.GetReg(), 2, WrapPointer(tab_rec));
+  NewLIR5(kX86PcRelLoadRA, disp_reg.GetReg(), start_of_method_reg.GetReg(), keyReg.GetReg(),
+          2, WrapPointer(tab_rec));
   // Add displacement to start of method
-  OpRegReg(kOpAdd, start_of_method_reg, disp_reg);
+  if (Gen64Bit()) {
+    NewLIR2(kX86Add64RR, start_of_method_reg.GetReg(), disp_reg.GetReg());
+  } else {
+    OpRegReg(kOpAdd, start_of_method_reg, disp_reg);
+  }
   // ..and go!
   LIR* switch_branch = NewLIR1(kX86JmpR, start_of_method_reg.GetReg());
   tab_rec->anchor = switch_branch;
@@ -150,13 +163,18 @@
   if (base_of_code_ != nullptr) {
     // We can use the saved value.
     RegLocation rl_method = mir_graph_->GetRegLocation(base_of_code_->s_reg_low);
-    LoadValueDirect(rl_method, rs_rX86_ARG2);
+    if (rl_method.wide) {
+      LoadValueDirectWide(rl_method, rs_rX86_ARG2);
+    } else {
+      LoadValueDirect(rl_method, rs_rX86_ARG2);
+    }
     store_method_addr_used_ = true;
   } else {
+    // TODO(64) force to be 64-bit
     NewLIR1(kX86StartOfMethod, rs_rX86_ARG2.GetReg());
   }
   NewLIR2(kX86PcRelAdr, rs_rX86_ARG1.GetReg(), WrapPointer(tab_rec));
-  NewLIR2(kX86Add32RR, rs_rX86_ARG1.GetReg(), rs_rX86_ARG2.GetReg());
+  NewLIR2(Gen64Bit() ? kX86Add64RR : kX86Add32RR, rs_rX86_ARG1.GetReg(), rs_rX86_ARG2.GetReg());
   if (Is64BitInstructionSet(cu_->instruction_set)) {
     CallRuntimeHelperRegReg(QUICK_ENTRYPOINT_OFFSET(8, pHandleFillArrayData), rs_rX86_ARG0,
                             rs_rX86_ARG1, true);
@@ -264,9 +282,10 @@
       OpRegThreadMem(kOpCmp, rs_rX86_SP, Thread::StackEndOffset<4>());
     }
     LIR* branch = OpCondBranch(kCondUlt, nullptr);
-    AddSlowPath(new(arena_)StackOverflowSlowPath(this, branch,
-                                                 frame_size_ -
-                                                 GetInstructionSetPointerSize(cu_->instruction_set)));
+    AddSlowPath(
+        new(arena_)StackOverflowSlowPath(this, branch,
+                                         frame_size_ -
+                                         GetInstructionSetPointerSize(cu_->instruction_set)));
   }
 
   FlushIns(ArgLocs, rl_method);
@@ -276,7 +295,7 @@
     setup_method_address_[0] = NewLIR1(kX86StartOfMethod, rs_rX86_ARG0.GetReg());
     int displacement = SRegOffset(base_of_code_->s_reg_low);
     // Native pointer - must be natural word size.
-    setup_method_address_[1] = StoreWordDisp(rs_rX86_SP, displacement, rs_rX86_ARG0);
+    setup_method_address_[1] = StoreBaseDisp(rs_rX86_SP, displacement, rs_rX86_ARG0, Gen64Bit() ? k64 : k32);
   }
 
   FreeTemp(rs_rX86_ARG0);
diff --git a/compiler/dex/quick/x86/int_x86.cc b/compiler/dex/quick/x86/int_x86.cc
index 1cc16b9..92069be 100644
--- a/compiler/dex/quick/x86/int_x86.cc
+++ b/compiler/dex/quick/x86/int_x86.cc
@@ -108,7 +108,7 @@
   }
   if (r_dest.IsFloat() || r_src.IsFloat())
     return OpFpRegCopy(r_dest, r_src);
-  LIR* res = RawLIR(current_dalvik_offset_, kX86Mov32RR,
+  LIR* res = RawLIR(current_dalvik_offset_, r_dest.Is64Bit() ? kX86Mov64RR : kX86Mov32RR,
                     r_dest.GetReg(), r_src.GetReg());
   if (!(cu_->disable_opt & (1 << kSafeOptimizations)) && r_dest == r_src) {
     res->flags.is_nop = true;
@@ -133,36 +133,51 @@
       } else {
         // TODO: Prevent this from happening in the code. The result is often
         // unused or could have been loaded more easily from memory.
-        NewLIR2(kX86MovdxrRR, r_dest.GetReg(), r_src.GetLowReg());
-        RegStorage r_tmp = AllocTempDouble();
-        NewLIR2(kX86MovdxrRR, r_tmp.GetReg(), r_src.GetHighReg());
-        NewLIR2(kX86PunpckldqRR, r_dest.GetReg(), r_tmp.GetReg());
-        FreeTemp(r_tmp);
+        if (!r_src.IsPair()) {
+          DCHECK(!r_dest.IsPair());
+          NewLIR2(kX86MovqxrRR, r_dest.GetReg(), r_src.GetReg());
+        } else {
+          NewLIR2(kX86MovdxrRR, r_dest.GetReg(), r_src.GetLowReg());
+          RegStorage r_tmp = AllocTempDouble();
+          NewLIR2(kX86MovdxrRR, r_tmp.GetReg(), r_src.GetHighReg());
+          NewLIR2(kX86PunpckldqRR, r_dest.GetReg(), r_tmp.GetReg());
+          FreeTemp(r_tmp);
+        }
       }
     } else {
       if (src_fp) {
-        NewLIR2(kX86MovdrxRR, r_dest.GetLowReg(), r_src.GetReg());
-        RegStorage temp_reg = AllocTempDouble();
-        NewLIR2(kX86MovsdRR, temp_reg.GetReg(), r_src.GetReg());
-        NewLIR2(kX86PsrlqRI, temp_reg.GetReg(), 32);
-        NewLIR2(kX86MovdrxRR, r_dest.GetHighReg(), temp_reg.GetReg());
-      } else {
-        DCHECK(r_dest.IsPair());
-        DCHECK(r_src.IsPair());
-        // Handle overlap
-        if (r_src.GetHighReg() == r_dest.GetLowReg() && r_src.GetLowReg() == r_dest.GetHighReg()) {
-          // Deal with cycles.
-          RegStorage temp_reg = AllocTemp();
-          OpRegCopy(temp_reg, r_dest.GetHigh());
-          OpRegCopy(r_dest.GetHigh(), r_dest.GetLow());
-          OpRegCopy(r_dest.GetLow(), temp_reg);
-          FreeTemp(temp_reg);
-        } else if (r_src.GetHighReg() == r_dest.GetLowReg()) {
-          OpRegCopy(r_dest.GetHigh(), r_src.GetHigh());
-          OpRegCopy(r_dest.GetLow(), r_src.GetLow());
+        if (!r_dest.IsPair()) {
+          DCHECK(!r_src.IsPair());
+          NewLIR2(kX86MovqrxRR, r_dest.GetReg(), r_src.GetReg());
         } else {
-          OpRegCopy(r_dest.GetLow(), r_src.GetLow());
-          OpRegCopy(r_dest.GetHigh(), r_src.GetHigh());
+          NewLIR2(kX86MovdrxRR, r_dest.GetLowReg(), r_src.GetReg());
+          RegStorage temp_reg = AllocTempDouble();
+          NewLIR2(kX86MovsdRR, temp_reg.GetReg(), r_src.GetReg());
+          NewLIR2(kX86PsrlqRI, temp_reg.GetReg(), 32);
+          NewLIR2(kX86MovdrxRR, r_dest.GetHighReg(), temp_reg.GetReg());
+        }
+      } else {
+        DCHECK_EQ(r_dest.IsPair(), r_src.IsPair());
+        if (!r_src.IsPair()) {
+          // Just copy the register directly.
+          OpRegCopy(r_dest, r_src);
+        } else {
+          // Handle overlap
+          if (r_src.GetHighReg() == r_dest.GetLowReg() &&
+              r_src.GetLowReg() == r_dest.GetHighReg()) {
+            // Deal with cycles.
+            RegStorage temp_reg = AllocTemp();
+            OpRegCopy(temp_reg, r_dest.GetHigh());
+            OpRegCopy(r_dest.GetHigh(), r_dest.GetLow());
+            OpRegCopy(r_dest.GetLow(), temp_reg);
+            FreeTemp(temp_reg);
+          } else if (r_src.GetHighReg() == r_dest.GetLowReg()) {
+            OpRegCopy(r_dest.GetHigh(), r_src.GetHigh());
+            OpRegCopy(r_dest.GetLow(), r_src.GetLow());
+          } else {
+            OpRegCopy(r_dest.GetLow(), r_src.GetLow());
+            OpRegCopy(r_dest.GetHigh(), r_src.GetHigh());
+          }
         }
       }
     }
@@ -832,7 +847,11 @@
 
   // Address the start of the method
   RegLocation rl_method = mir_graph_->GetRegLocation(base_of_code_->s_reg_low);
-  LoadValueDirectFixed(rl_method, reg);
+  if (rl_method.wide) {
+    LoadValueDirectWideFixed(rl_method, reg);
+  } else {
+    LoadValueDirectFixed(rl_method, reg);
+  }
   store_method_addr_used_ = true;
 
   // Load the proper value from the literal area.
@@ -1695,40 +1714,50 @@
                                 bool is_high_op) {
   bool rhs_in_mem = rhs.location != kLocPhysReg;
   bool dest_in_mem = dest.location != kLocPhysReg;
+  bool is64Bit = Gen64Bit();
   DCHECK(!rhs_in_mem || !dest_in_mem);
   switch (op) {
     case Instruction::ADD_LONG:
     case Instruction::ADD_LONG_2ADDR:
       if (dest_in_mem) {
-        return is_high_op ? kX86Adc32MR : kX86Add32MR;
+        return is64Bit ? kX86Add64MR : is_high_op ? kX86Adc32MR : kX86Add32MR;
       } else if (rhs_in_mem) {
-        return is_high_op ? kX86Adc32RM : kX86Add32RM;
+        return is64Bit ? kX86Add64RM : is_high_op ? kX86Adc32RM : kX86Add32RM;
       }
-      return is_high_op ? kX86Adc32RR : kX86Add32RR;
+      return is64Bit ? kX86Add64RR : is_high_op ? kX86Adc32RR : kX86Add32RR;
     case Instruction::SUB_LONG:
     case Instruction::SUB_LONG_2ADDR:
       if (dest_in_mem) {
-        return is_high_op ? kX86Sbb32MR : kX86Sub32MR;
+        return is64Bit ? kX86Sub64MR : is_high_op ? kX86Sbb32MR : kX86Sub32MR;
       } else if (rhs_in_mem) {
-        return is_high_op ? kX86Sbb32RM : kX86Sub32RM;
+        return is64Bit ? kX86Sub64RM : is_high_op ? kX86Sbb32RM : kX86Sub32RM;
       }
-      return is_high_op ? kX86Sbb32RR : kX86Sub32RR;
+      return is64Bit ? kX86Sub64RR : is_high_op ? kX86Sbb32RR : kX86Sub32RR;
     case Instruction::AND_LONG_2ADDR:
     case Instruction::AND_LONG:
       if (dest_in_mem) {
-        return kX86And32MR;
+        return is64Bit ? kX86And64MR : kX86And32MR;
+      }
+      if (is64Bit) {
+        return rhs_in_mem ? kX86And64RM : kX86And64RR;
       }
       return rhs_in_mem ? kX86And32RM : kX86And32RR;
     case Instruction::OR_LONG:
     case Instruction::OR_LONG_2ADDR:
       if (dest_in_mem) {
-        return kX86Or32MR;
+        return is64Bit ? kX86Or64MR : kX86Or32MR;
+      }
+      if (is64Bit) {
+        return rhs_in_mem ? kX86Or64RM : kX86Or64RR;
       }
       return rhs_in_mem ? kX86Or32RM : kX86Or32RR;
     case Instruction::XOR_LONG:
     case Instruction::XOR_LONG_2ADDR:
       if (dest_in_mem) {
-        return kX86Xor32MR;
+        return is64Bit ? kX86Xor64MR : kX86Xor32MR;
+      }
+      if (is64Bit) {
+        return rhs_in_mem ? kX86Xor64RM : kX86Xor64RR;
       }
       return rhs_in_mem ? kX86Xor32RM : kX86Xor32RR;
     default:
@@ -1740,6 +1769,7 @@
 X86OpCode X86Mir2Lir::GetOpcode(Instruction::Code op, RegLocation loc, bool is_high_op,
                                 int32_t value) {
   bool in_mem = loc.location != kLocPhysReg;
+  bool is64Bit = Gen64Bit();
   bool byte_imm = IS_SIMM8(value);
   DCHECK(in_mem || !loc.reg.IsFloat());
   switch (op) {
@@ -1747,43 +1777,61 @@
     case Instruction::ADD_LONG_2ADDR:
       if (byte_imm) {
         if (in_mem) {
-          return is_high_op ? kX86Adc32MI8 : kX86Add32MI8;
+          return is64Bit ? kX86Add64MI8 : is_high_op ? kX86Adc32MI8 : kX86Add32MI8;
         }
-        return is_high_op ? kX86Adc32RI8 : kX86Add32RI8;
+        return is64Bit ? kX86Add64RI8 : is_high_op ? kX86Adc32RI8 : kX86Add32RI8;
       }
       if (in_mem) {
-        return is_high_op ? kX86Adc32MI : kX86Add32MI;
+        return is64Bit ? kX86Add64MI : is_high_op ? kX86Adc32MI : kX86Add32MI;
       }
-      return is_high_op ? kX86Adc32RI : kX86Add32RI;
+      return is64Bit ? kX86Add64RI : is_high_op ? kX86Adc32RI : kX86Add32RI;
     case Instruction::SUB_LONG:
     case Instruction::SUB_LONG_2ADDR:
       if (byte_imm) {
         if (in_mem) {
-          return is_high_op ? kX86Sbb32MI8 : kX86Sub32MI8;
+          return is64Bit ? kX86Sub64MI8 : is_high_op ? kX86Sbb32MI8 : kX86Sub32MI8;
         }
-        return is_high_op ? kX86Sbb32RI8 : kX86Sub32RI8;
+        return is64Bit ? kX86Sub64RI8 : is_high_op ? kX86Sbb32RI8 : kX86Sub32RI8;
       }
       if (in_mem) {
-        return is_high_op ? kX86Sbb32MI : kX86Sub32MI;
+        return is64Bit ? kX86Sub64MI : is_high_op ? kX86Sbb32MI : kX86Sub32MI;
       }
-      return is_high_op ? kX86Sbb32RI : kX86Sub32RI;
+      return is64Bit ? kX86Sub64RI : is_high_op ? kX86Sbb32RI : kX86Sub32RI;
     case Instruction::AND_LONG_2ADDR:
     case Instruction::AND_LONG:
       if (byte_imm) {
+        if (is64Bit) {
+          return in_mem ? kX86And64MI8 : kX86And64RI8;
+        }
         return in_mem ? kX86And32MI8 : kX86And32RI8;
       }
+      if (is64Bit) {
+        return in_mem ? kX86And64MI : kX86And64RI;
+      }
       return in_mem ? kX86And32MI : kX86And32RI;
     case Instruction::OR_LONG:
     case Instruction::OR_LONG_2ADDR:
       if (byte_imm) {
+        if (is64Bit) {
+          return in_mem ? kX86Or64MI8 : kX86Or64RI8;
+        }
         return in_mem ? kX86Or32MI8 : kX86Or32RI8;
       }
+      if (is64Bit) {
+        return in_mem ? kX86Or64MI : kX86Or64RI;
+      }
       return in_mem ? kX86Or32MI : kX86Or32RI;
     case Instruction::XOR_LONG:
     case Instruction::XOR_LONG_2ADDR:
       if (byte_imm) {
+        if (is64Bit) {
+          return in_mem ? kX86Xor64MI8 : kX86Xor64RI8;
+        }
         return in_mem ? kX86Xor32MI8 : kX86Xor32RI8;
       }
+      if (is64Bit) {
+        return in_mem ? kX86Xor64MI : kX86Xor64RI;
+      }
       return in_mem ? kX86Xor32MI : kX86Xor32RI;
     default:
       LOG(FATAL) << "Unexpected opcode: " << op;
diff --git a/compiler/dex/quick/x86/target_x86.cc b/compiler/dex/quick/x86/target_x86.cc
index 160ec62..100ed13 100644
--- a/compiler/dex/quick/x86/target_x86.cc
+++ b/compiler/dex/quick/x86/target_x86.cc
@@ -687,6 +687,14 @@
 }
 
 RegisterClass X86Mir2Lir::RegClassForFieldLoadStore(OpSize size, bool is_volatile) {
+  // X86_64 can handle any size.
+  if (Gen64Bit()) {
+    if (size == kReference) {
+      return kRefReg;
+    }
+    return kCoreReg;
+  }
+
   if (UNLIKELY(is_volatile)) {
     // On x86, atomic 64-bit load/store requires an fp register.
     // Smaller aligned load/store is atomic for both core and fp registers.
@@ -1425,7 +1433,11 @@
 
   // Address the start of the method.
   RegLocation rl_method = mir_graph_->GetRegLocation(base_of_code_->s_reg_low);
-  rl_method = LoadValue(rl_method, kCoreReg);
+  if (rl_method.wide) {
+    rl_method = LoadValueWide(rl_method, kCoreReg);
+  } else {
+    rl_method = LoadValue(rl_method, kCoreReg);
+  }
 
   // Load the proper value from the literal area.
   // We don't know the proper offset for the value, so pick one that will force
diff --git a/compiler/dex/quick/x86/utility_x86.cc b/compiler/dex/quick/x86/utility_x86.cc
index 618b3a5..d074d81 100644
--- a/compiler/dex/quick/x86/utility_x86.cc
+++ b/compiler/dex/quick/x86/utility_x86.cc
@@ -89,11 +89,8 @@
     res = NewLIR2(kX86Xor32RR, r_dest.GetReg(), r_dest.GetReg());
   } else {
     // Note, there is no byte immediate form of a 32 bit immediate move.
-    if (r_dest.Is64Bit()) {
-      res = NewLIR2(kX86Mov64RI, r_dest.GetReg(), value);
-    } else {
-      res = NewLIR2(kX86Mov32RI, r_dest.GetReg(), value);
-    }
+    // 64-bit immediate is not supported by LIR structure
+    res = NewLIR2(kX86Mov32RI, r_dest.GetReg(), value);
   }
 
   if (r_dest_save.IsFloat()) {
@@ -120,8 +117,8 @@
 LIR* X86Mir2Lir::OpReg(OpKind op, RegStorage r_dest_src) {
   X86OpCode opcode = kX86Bkpt;
   switch (op) {
-    case kOpNeg: opcode = kX86Neg32R; break;
-    case kOpNot: opcode = kX86Not32R; break;
+    case kOpNeg: opcode = r_dest_src.Is64Bit() ? kX86Neg64R : kX86Neg32R; break;
+    case kOpNot: opcode = r_dest_src.Is64Bit() ? kX86Not64R : kX86Not32R; break;
     case kOpRev: opcode = kX86Bswap32R; break;
     case kOpBlx: opcode = kX86CallR; break;
     default:
@@ -138,6 +135,9 @@
     switch (op) {
       case kOpAdd: opcode = byte_imm ? kX86Add64RI8 : kX86Add64RI; break;
       case kOpSub: opcode = byte_imm ? kX86Sub64RI8 : kX86Sub64RI; break;
+      case kOpLsl: opcode = kX86Sal64RI; break;
+      case kOpLsr: opcode = kX86Shr64RI; break;
+      case kOpAsr: opcode = kX86Sar64RI; break;
       default:
         LOG(FATAL) << "Bad case in OpRegImm (64-bit) " << op;
     }
@@ -189,6 +189,7 @@
 }
 
 LIR* X86Mir2Lir::OpRegReg(OpKind op, RegStorage r_dest_src1, RegStorage r_src2) {
+    bool is64Bit = r_dest_src1.Is64Bit();
     X86OpCode opcode = kX86Nop;
     bool src2_must_be_cx = false;
     switch (op) {
@@ -207,33 +208,34 @@
         OpReg(kOpRev, r_dest_src1);
         return OpRegImm(kOpAsr, r_dest_src1, 16);
         // X86 binary opcodes
-      case kOpSub: opcode = kX86Sub32RR; break;
-      case kOpSbc: opcode = kX86Sbb32RR; break;
-      case kOpLsl: opcode = kX86Sal32RC; src2_must_be_cx = true; break;
-      case kOpLsr: opcode = kX86Shr32RC; src2_must_be_cx = true; break;
-      case kOpAsr: opcode = kX86Sar32RC; src2_must_be_cx = true; break;
-      case kOpMov: opcode = kX86Mov32RR; break;
-      case kOpCmp: opcode = kX86Cmp32RR; break;
-      case kOpAdd: opcode = kX86Add32RR; break;
-      case kOpAdc: opcode = kX86Adc32RR; break;
-      case kOpAnd: opcode = kX86And32RR; break;
-      case kOpOr:  opcode = kX86Or32RR; break;
-      case kOpXor: opcode = kX86Xor32RR; break;
+      case kOpSub: opcode = is64Bit ? kX86Sub64RR : kX86Sub32RR; break;
+      case kOpSbc: opcode = is64Bit ? kX86Sbb64RR : kX86Sbb32RR; break;
+      case kOpLsl: opcode = is64Bit ? kX86Sal64RC : kX86Sal32RC; src2_must_be_cx = true; break;
+      case kOpLsr: opcode = is64Bit ? kX86Shr64RC : kX86Shr32RC; src2_must_be_cx = true; break;
+      case kOpAsr: opcode = is64Bit ? kX86Sar64RC : kX86Sar32RC; src2_must_be_cx = true; break;
+      case kOpMov: opcode = is64Bit ? kX86Mov64RR : kX86Mov32RR; break;
+      case kOpCmp: opcode = is64Bit ? kX86Cmp64RR : kX86Cmp32RR; break;
+      case kOpAdd: opcode = is64Bit ? kX86Add64RR : kX86Add32RR; break;
+      case kOpAdc: opcode = is64Bit ? kX86Adc64RR : kX86Adc32RR; break;
+      case kOpAnd: opcode = is64Bit ? kX86And64RR : kX86And32RR; break;
+      case kOpOr:  opcode = is64Bit ? kX86Or64RR : kX86Or32RR; break;
+      case kOpXor: opcode = is64Bit ? kX86Xor64RR : kX86Xor32RR; break;
       case kOp2Byte:
         // TODO: there are several instances of this check.  A utility function perhaps?
         // TODO: Similar to Arm's reg < 8 check.  Perhaps add attribute checks to RegStorage?
         // Use shifts instead of a byte operand if the source can't be byte accessed.
         if (r_src2.GetRegNum() >= rs_rX86_SP.GetRegNum()) {
-          NewLIR2(kX86Mov32RR, r_dest_src1.GetReg(), r_src2.GetReg());
-          NewLIR2(kX86Sal32RI, r_dest_src1.GetReg(), 24);
-          return NewLIR2(kX86Sar32RI, r_dest_src1.GetReg(), 24);
+          NewLIR2(is64Bit ? kX86Mov64RR : kX86Mov32RR, r_dest_src1.GetReg(), r_src2.GetReg());
+          NewLIR2(is64Bit ? kX86Sal64RI : kX86Sal32RI, r_dest_src1.GetReg(), is64Bit ? 56 : 24);
+          return NewLIR2(is64Bit ? kX86Sar64RI : kX86Sar32RI, r_dest_src1.GetReg(),
+                         is64Bit ? 56 : 24);
         } else {
-          opcode = kX86Movsx8RR;
+          opcode = is64Bit ? kX86Bkpt : kX86Movsx8RR;
         }
         break;
-      case kOp2Short: opcode = kX86Movsx16RR; break;
-      case kOp2Char: opcode = kX86Movzx16RR; break;
-      case kOpMul: opcode = kX86Imul32RR; break;
+      case kOp2Short: opcode = is64Bit ? kX86Bkpt : kX86Movsx16RR; break;
+      case kOp2Char: opcode = is64Bit ? kX86Bkpt : kX86Movzx16RR; break;
+      case kOpMul: opcode = is64Bit ? kX86Bkpt : kX86Imul32RR; break;
       default:
         LOG(FATAL) << "Bad case in OpRegReg " << op;
         break;
@@ -354,16 +356,17 @@
 }
 
 LIR* X86Mir2Lir::OpRegMem(OpKind op, RegStorage r_dest, RegStorage r_base, int offset) {
+  bool is64Bit = r_dest.Is64Bit();
   X86OpCode opcode = kX86Nop;
   switch (op) {
       // X86 binary opcodes
-    case kOpSub: opcode = kX86Sub32RM; break;
-    case kOpMov: opcode = kX86Mov32RM; break;
-    case kOpCmp: opcode = kX86Cmp32RM; break;
-    case kOpAdd: opcode = kX86Add32RM; break;
-    case kOpAnd: opcode = kX86And32RM; break;
-    case kOpOr:  opcode = kX86Or32RM; break;
-    case kOpXor: opcode = kX86Xor32RM; break;
+    case kOpSub: opcode = is64Bit ? kX86Sub64RM : kX86Sub32RM; break;
+    case kOpMov: opcode = is64Bit ? kX86Mov64RM : kX86Mov32RM; break;
+    case kOpCmp: opcode = is64Bit ? kX86Cmp64RM : kX86Cmp32RM; break;
+    case kOpAdd: opcode = is64Bit ? kX86Add64RM : kX86Add32RM; break;
+    case kOpAnd: opcode = is64Bit ? kX86And64RM : kX86And32RM; break;
+    case kOpOr:  opcode = is64Bit ? kX86Or64RM : kX86Or32RM; break;
+    case kOpXor: opcode = is64Bit ? kX86Xor64RM : kX86Xor32RM; break;
     case kOp2Byte: opcode = kX86Movsx8RM; break;
     case kOp2Short: opcode = kX86Movsx16RM; break;
     case kOp2Char: opcode = kX86Movzx16RM; break;
@@ -382,63 +385,68 @@
 LIR* X86Mir2Lir::OpMemReg(OpKind op, RegLocation rl_dest, int r_value) {
   DCHECK_NE(rl_dest.location, kLocPhysReg);
   int displacement = SRegOffset(rl_dest.s_reg_low);
+  bool is64Bit = rl_dest.wide != 0;
   X86OpCode opcode = kX86Nop;
   switch (op) {
-    case kOpSub: opcode = kX86Sub32MR; break;
-    case kOpMov: opcode = kX86Mov32MR; break;
-    case kOpCmp: opcode = kX86Cmp32MR; break;
-    case kOpAdd: opcode = kX86Add32MR; break;
-    case kOpAnd: opcode = kX86And32MR; break;
-    case kOpOr:  opcode = kX86Or32MR; break;
-    case kOpXor: opcode = kX86Xor32MR; break;
-    case kOpLsl: opcode = kX86Sal32MC; break;
-    case kOpLsr: opcode = kX86Shr32MC; break;
-    case kOpAsr: opcode = kX86Sar32MC; break;
+    case kOpSub: opcode = is64Bit ? kX86Sub64MR : kX86Sub32MR; break;
+    case kOpMov: opcode = is64Bit ? kX86Mov64MR : kX86Mov32MR; break;
+    case kOpCmp: opcode = is64Bit ? kX86Cmp64MR : kX86Cmp32MR; break;
+    case kOpAdd: opcode = is64Bit ? kX86Add64MR : kX86Add32MR; break;
+    case kOpAnd: opcode = is64Bit ? kX86And64MR : kX86And32MR; break;
+    case kOpOr:  opcode = is64Bit ? kX86Or64MR : kX86Or32MR; break;
+    case kOpXor: opcode = is64Bit ? kX86Xor64MR : kX86Xor32MR; break;
+    case kOpLsl: opcode = is64Bit ? kX86Sal64MC : kX86Sal32MC; break;
+    case kOpLsr: opcode = is64Bit ? kX86Shr64MC : kX86Shr32MC; break;
+    case kOpAsr: opcode = is64Bit ? kX86Sar64MC : kX86Sar32MC; break;
     default:
       LOG(FATAL) << "Bad case in OpMemReg " << op;
       break;
   }
   LIR *l = NewLIR3(opcode, rs_rX86_SP.GetReg(), displacement, r_value);
-  AnnotateDalvikRegAccess(l, displacement >> 2, true /* is_load */, false /* is_64bit */);
-  AnnotateDalvikRegAccess(l, displacement >> 2, false /* is_load */, false /* is_64bit */);
+  AnnotateDalvikRegAccess(l, displacement >> 2, true /* is_load */, is64Bit /* is_64bit */);
+  AnnotateDalvikRegAccess(l, displacement >> 2, false /* is_load */, is64Bit /* is_64bit */);
   return l;
 }
 
 LIR* X86Mir2Lir::OpRegMem(OpKind op, RegStorage r_dest, RegLocation rl_value) {
   DCHECK_NE(rl_value.location, kLocPhysReg);
+  bool is64Bit = r_dest.Is64Bit();
   int displacement = SRegOffset(rl_value.s_reg_low);
   X86OpCode opcode = kX86Nop;
   switch (op) {
-    case kOpSub: opcode = kX86Sub32RM; break;
-    case kOpMov: opcode = kX86Mov32RM; break;
-    case kOpCmp: opcode = kX86Cmp32RM; break;
-    case kOpAdd: opcode = kX86Add32RM; break;
-    case kOpAnd: opcode = kX86And32RM; break;
-    case kOpOr:  opcode = kX86Or32RM; break;
-    case kOpXor: opcode = kX86Xor32RM; break;
-    case kOpMul: opcode = kX86Imul32RM; break;
+    case kOpSub: opcode = is64Bit ? kX86Sub64RM : kX86Sub32RM; break;
+    case kOpMov: opcode = is64Bit ? kX86Mov64RM : kX86Mov32RM; break;
+    case kOpCmp: opcode = is64Bit ? kX86Cmp64RM : kX86Cmp32RM; break;
+    case kOpAdd: opcode = is64Bit ? kX86Add64RM : kX86Add32RM; break;
+    case kOpAnd: opcode = is64Bit ? kX86And64RM : kX86And32RM; break;
+    case kOpOr:  opcode = is64Bit ? kX86Or64RM : kX86Or32RM; break;
+    case kOpXor: opcode = is64Bit ? kX86Xor64RM : kX86Xor32RM; break;
+    case kOpMul: opcode = is64Bit ? kX86Bkpt : kX86Imul32RM; break;
     default:
       LOG(FATAL) << "Bad case in OpRegMem " << op;
       break;
   }
   LIR *l = NewLIR3(opcode, r_dest.GetReg(), rs_rX86_SP.GetReg(), displacement);
-  AnnotateDalvikRegAccess(l, displacement >> 2, true /* is_load */, false /* is_64bit */);
+  AnnotateDalvikRegAccess(l, displacement >> 2, true /* is_load */, is64Bit /* is_64bit */);
   return l;
 }
 
 LIR* X86Mir2Lir::OpRegRegReg(OpKind op, RegStorage r_dest, RegStorage r_src1,
                              RegStorage r_src2) {
+  bool is64Bit = r_dest.Is64Bit();
   if (r_dest != r_src1 && r_dest != r_src2) {
     if (op == kOpAdd) {  // lea special case, except can't encode rbp as base
       if (r_src1 == r_src2) {
         OpRegCopy(r_dest, r_src1);
         return OpRegImm(kOpLsl, r_dest, 1);
       } else if (r_src1 != rs_rBP) {
-        return NewLIR5(kX86Lea32RA, r_dest.GetReg(), r_src1.GetReg() /* base */,
-                       r_src2.GetReg() /* index */, 0 /* scale */, 0 /* disp */);
+        return NewLIR5(is64Bit ? kX86Lea64RA : kX86Lea32RA, r_dest.GetReg(),
+                       r_src1.GetReg() /* base */, r_src2.GetReg() /* index */,
+                       0 /* scale */, 0 /* disp */);
       } else {
-        return NewLIR5(kX86Lea32RA, r_dest.GetReg(), r_src2.GetReg() /* base */,
-                       r_src1.GetReg() /* index */, 0 /* scale */, 0 /* disp */);
+        return NewLIR5(is64Bit ? kX86Lea64RA : kX86Lea32RA, r_dest.GetReg(),
+                       r_src2.GetReg() /* base */, r_src1.GetReg() /* index */,
+                       0 /* scale */, 0 /* disp */);
       }
     } else {
       OpRegCopy(r_dest, r_src1);
@@ -476,10 +484,10 @@
 }
 
 LIR* X86Mir2Lir::OpRegRegImm(OpKind op, RegStorage r_dest, RegStorage r_src, int value) {
-  if (op == kOpMul) {
+  if (op == kOpMul && !Gen64Bit()) {
     X86OpCode opcode = IS_SIMM8(value) ? kX86Imul32RRI8 : kX86Imul32RRI;
     return NewLIR3(opcode, r_dest.GetReg(), r_src.GetReg(), value);
-  } else if (op == kOpAnd) {
+  } else if (op == kOpAnd && !Gen64Bit()) {
     if (value == 0xFF && r_src.Low4()) {
       return NewLIR2(kX86Movzx8RR, r_dest.GetReg(), r_src.GetReg());
     } else if (value == 0xFFFF) {
@@ -492,8 +500,9 @@
       return NewLIR5(kX86Lea32RA, r_dest.GetReg(),  r5sib_no_base /* base */,
                      r_src.GetReg() /* index */, value /* scale */, 0 /* disp */);
     } else if (op == kOpAdd) {  // lea add special case
-      return NewLIR5(kX86Lea32RA, r_dest.GetReg(), r_src.GetReg() /* base */,
-                     rs_rX86_SP.GetReg()/*r4sib_no_index*/ /* index */, 0 /* scale */, value /* disp */);
+      return NewLIR5(Gen64Bit() ? kX86Lea64RA : kX86Lea32RA, r_dest.GetReg(),
+                     r_src.GetReg() /* base */, rs_rX86_SP.GetReg()/*r4sib_no_index*/ /* index */,
+                     0 /* scale */, value /* disp */);
     }
     OpRegCopy(r_dest, r_src);
   }
@@ -556,7 +565,11 @@
 
         // Address the start of the method
         RegLocation rl_method = mir_graph_->GetRegLocation(base_of_code_->s_reg_low);
-        rl_method = LoadValue(rl_method, kCoreReg);
+        if (rl_method.wide) {
+          rl_method = LoadValueWide(rl_method, kCoreReg);
+        } else {
+          rl_method = LoadValue(rl_method, kCoreReg);
+        }
 
         // Load the proper value from the literal area.
         // We don't know the proper offset for the value, so pick one that will force
@@ -582,8 +595,20 @@
         }
       }
     } else {
-      res = LoadConstantNoClobber(r_dest.GetLow(), val_lo);
-      LoadConstantNoClobber(r_dest.GetHigh(), val_hi);
+      if (r_dest.IsPair()) {
+        res = LoadConstantNoClobber(r_dest.GetLow(), val_lo);
+        LoadConstantNoClobber(r_dest.GetHigh(), val_hi);
+      } else {
+        // TODO(64) make int64_t value parameter of LoadConstantNoClobber
+        if (val_lo < 0) {
+          val_hi += 1;
+        }
+        res = LoadConstantNoClobber(RegStorage::Solo32(r_dest.GetReg()), val_hi);
+        NewLIR2(kX86Sal64RI, r_dest.GetReg(), 32);
+        if (val_lo != 0) {
+          NewLIR2(kX86Add64RI, r_dest.GetReg(), val_lo);
+        }
+      }
     }
     return res;
 }
@@ -601,6 +626,8 @@
     case kDouble:
       if (r_dest.IsFloat()) {
         opcode = is_array ? kX86MovsdRA : kX86MovsdRM;
+      } else if (!pair) {
+        opcode = is_array ? kX86Mov64RA  : kX86Mov64RM;
       } else {
         opcode = is_array ? kX86Mov32RA  : kX86Mov32RM;
       }
@@ -742,13 +769,10 @@
     case kDouble:
       if (r_src.IsFloat()) {
         opcode = is_array ? kX86MovsdAR : kX86MovsdMR;
+      } else if (!pair) {
+        opcode = is_array ? kX86Mov64AR  : kX86Mov64MR;
       } else {
-        if (Gen64Bit()) {
-          opcode = is_array ? kX86Mov64AR  : kX86Mov64MR;
-        } else {
-          // TODO(64): pair = true;
-          opcode = is_array ? kX86Mov32AR  : kX86Mov32MR;
-        }
+        opcode = is_array ? kX86Mov32AR  : kX86Mov32MR;
       }
       // TODO: double store is to unaligned address
       DCHECK_EQ((displacement & 0x3), 0);
@@ -855,7 +879,7 @@
 
   // Did we need a pointer to the method code?
   if (store_method_addr_) {
-    base_of_code_ = mir_graph_->GetNewCompilerTemp(kCompilerTempVR, false);
+    base_of_code_ = mir_graph_->GetNewCompilerTemp(kCompilerTempVR, Gen64Bit() == true);
   } else {
     base_of_code_ = nullptr;
   }
@@ -971,6 +995,7 @@
       loc.location = kLocDalvikFrame;
     }
   }
+  DCHECK(CheckCorePoolSanity());
   return loc;
 }
 
@@ -984,7 +1009,7 @@
       loc.location = kLocDalvikFrame;
     }
   }
+  DCHECK(CheckCorePoolSanity());
   return loc;
 }
-
 }  // namespace art
diff --git a/compiler/dex/quick/x86/x86_lir.h b/compiler/dex/quick/x86/x86_lir.h
index f290548..e550488 100644
--- a/compiler/dex/quick/x86/x86_lir.h
+++ b/compiler/dex/quick/x86/x86_lir.h
@@ -377,6 +377,9 @@
 const RegLocation x86_loc_c_return_wide
     {kLocPhysReg, 1, 0, 0, 0, 0, 0, 0, 1,
      RegStorage(RegStorage::k64BitPair, rAX, rDX), INVALID_SREG, INVALID_SREG};
+const RegLocation x86_64_loc_c_return_wide
+    {kLocPhysReg, 1, 0, 0, 0, 0, 0, 0, 1,
+     RegStorage(RegStorage::k64BitSolo, rAX), INVALID_SREG, INVALID_SREG};
 const RegLocation x86_loc_c_return_float
     {kLocPhysReg, 0, 0, 0, 1, 0, 0, 0, 1,
      RegStorage(RegStorage::k32BitSolo, fr0), INVALID_SREG, INVALID_SREG};
@@ -519,6 +522,7 @@
   UnaryOpcode(kX86Divmod,  DaR, DaM, DaA),
   UnaryOpcode(kX86Idivmod, DaR, DaM, DaA),
   kx86Cdq32Da,
+  kx86Cqo64Da,
   kX86Bswap32R,
   kX86Push32R, kX86Pop32R,
 #undef UnaryOpcode
@@ -532,8 +536,12 @@
   kX86MovssAR,
   Binary0fOpCode(kX86Cvtsi2sd),  // int to double
   Binary0fOpCode(kX86Cvtsi2ss),  // int to float
+  Binary0fOpCode(kX86Cvtsqi2sd),  // long to double
+  Binary0fOpCode(kX86Cvtsqi2ss),  // long to float
   Binary0fOpCode(kX86Cvttsd2si),  // truncating double to int
   Binary0fOpCode(kX86Cvttss2si),  // truncating float to int
+  Binary0fOpCode(kX86Cvttsd2sqi),  // truncating double to long
+  Binary0fOpCode(kX86Cvttss2sqi),  // truncating float to long
   Binary0fOpCode(kX86Cvtsd2si),  // rounding double to int
   Binary0fOpCode(kX86Cvtss2si),  // rounding float to int
   Binary0fOpCode(kX86Ucomisd),  // unordered double compare
@@ -601,11 +609,15 @@
   kX86MovhpsRM, kX86MovhpsRA,   // load packed single FP values from m64 to high quadword of xmm
   kX86MovhpsMR, kX86MovhpsAR,   // store packed single FP values from high quadword of xmm to m64
   Binary0fOpCode(kX86Movdxr),   // move into xmm from gpr
+  Binary0fOpCode(kX86Movqxr),   // move into xmm from 64 bit gpr
+  kX86MovqrxRR, kX86MovqrxMR, kX86MovqrxAR,  // move into 64 bit reg from xmm
   kX86MovdrxRR, kX86MovdrxMR, kX86MovdrxAR,  // move into reg from xmm
+  kX86MovsxdRR, kX86MovsxdRM, kX86MovsxdRA,  // move 32 bit to 64 bit with sign extension
   kX86Set8R, kX86Set8M, kX86Set8A,  // set byte depending on condition operand
   kX86Mfence,                   // memory barrier
   Binary0fOpCode(kX86Imul16),   // 16bit multiply
   Binary0fOpCode(kX86Imul32),   // 32bit multiply
+  Binary0fOpCode(kX86Imul64),   // 64bit multiply
   kX86CmpxchgRR, kX86CmpxchgMR, kX86CmpxchgAR,  // compare and exchange
   kX86LockCmpxchgMR, kX86LockCmpxchgAR,  // locked compare and exchange
   kX86LockCmpxchg8bM, kX86LockCmpxchg8bA,  // locked compare and exchange