Index: lib/Target/Mips/AsmParser/MipsAsmParser.cpp
===================================================================
--- lib/Target/Mips/AsmParser/MipsAsmParser.cpp
+++ lib/Target/Mips/AsmParser/MipsAsmParser.cpp
@@ -479,6 +479,7 @@
 
   bool hasDSP() const { return STI.getFeatureBits()[Mips::FeatureDSP]; }
   bool hasDSPR2() const { return STI.getFeatureBits()[Mips::FeatureDSPR2]; }
+  bool hasDSPR3() const { return STI.getFeatureBits()[Mips::FeatureDSPR3]; }
   bool hasMSA() const { return STI.getFeatureBits()[Mips::FeatureMSA]; }
   bool hasCnMips() const {
     return (STI.getFeatureBits()[Mips::FeatureCnMips]);
Index: lib/Target/Mips/MCTargetDesc/MipsMCCodeEmitter.cpp
===================================================================
--- lib/Target/Mips/MCTargetDesc/MipsMCCodeEmitter.cpp
+++ lib/Target/Mips/MCTargetDesc/MipsMCCodeEmitter.cpp
@@ -190,6 +190,10 @@
     else
       NewOpcode = Mips::Std2MicroMips(Opcode, Mips::Arch_micromips);
 
+    // Check whether it is Dsp instruction.
+    if (NewOpcode == -1)
+      NewOpcode = Mips::Dsp2MicroMips(Opcode, Mips::Arch_mmdsp);
+
     if (NewOpcode != -1) {
       if (Fixups.size() > N)
         Fixups.pop_back();
Index: lib/Target/Mips/MicroMipsDSPInstrFormats.td
===================================================================
--- /dev/null
+++ lib/Target/Mips/MicroMipsDSPInstrFormats.td
@@ -0,0 +1,29 @@
+//===-- MicroMipsDSPInstrFormats.td - Micromips DSP Instruction Formats -*-
+//tablegen -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+class MMDSPInst<string opstr = "">
+    : MipsInst<(outs), (ins), "", [], NoItinerary, FrmOther> {
+  let Predicates = [HasDSP];
+  string BaseOpcode = opstr;
+  string Arch = "mmdsp";
+  let DecoderNamespace = "MicroMips";
+}
+
+class POOL32A_3R_FMT<bits<11> op> : MMDSPInst {
+  bits<5> rd;
+  bits<5> rs;
+  bits<5> rt;
+
+  let Inst{31-26} = 0b000000;
+  let Inst{25-21} = rt;
+  let Inst{20-16} = rs;
+  let Inst{15-11} = rd;
+  let Inst{10-0}  = op;
+}
Index: lib/Target/Mips/MicroMipsDSPInstrInfo.td
===================================================================
--- /dev/null
+++ lib/Target/Mips/MicroMipsDSPInstrInfo.td
@@ -0,0 +1,19 @@
+//===- MicroMipsDSPInstrInfo.td - Micromips DSP instructions -*- tablegen *-=//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file describes MicroMips DSP instructions.
+//
+//===----------------------------------------------------------------------===//
+
+// Instruction encoding.
+class ADDU_QB_MM_ENC : POOL32A_3R_FMT<0b00011001101>;
+
+// Instruction defs.
+// MIPS DSP Rev 1
+def ADDU_QB_MM : DspMMRel, ADDU_QB_MM_ENC, ADDU_QB_DESC;
Index: lib/Target/Mips/Mips.td
===================================================================
--- lib/Target/Mips/Mips.td
+++ lib/Target/Mips/Mips.td
@@ -154,6 +154,9 @@
 def FeatureDSP : SubtargetFeature<"dsp", "HasDSP", "true", "Mips DSP ASE">;
 def FeatureDSPR2 : SubtargetFeature<"dspr2", "HasDSPR2", "true",
                                     "Mips DSP-R2 ASE", [FeatureDSP]>;
+def FeatureDSPR3
+    : SubtargetFeature<"dspr3", "HasDSPR3", "true", "Mips DSP-R3 ASE",
+                       [ FeatureDSP, FeatureDSPR2 ]>;
 
 def FeatureMSA : SubtargetFeature<"msa", "HasMSA", "true", "Mips MSA ASE">;
 
Index: lib/Target/Mips/MipsDSPInstrFormats.td
===================================================================
--- lib/Target/Mips/MipsDSPInstrFormats.td
+++ lib/Target/Mips/MipsDSPInstrFormats.td
@@ -7,10 +7,26 @@
 //
 //===----------------------------------------------------------------------===//
 
+class DspMMRel;
+
+def Dsp2MicroMips : InstrMapping {
+  let FilterClass = "DspMMRel";
+  // Instructions with the same BaseOpcode and isNVStore values form a row.
+  let RowFields = ["BaseOpcode"];
+  // Instructions with the same predicate sense form a column.
+  let ColFields = ["Arch"];
+  // The key column is the unpredicated instructions.
+  let KeyCol = ["dsp"];
+  // Value columns are PredSense=true and PredSense=false
+  let ValueCols = [["dsp"], ["mmdsp"]];
+}
+
 def HasDSP : Predicate<"Subtarget->hasDSP()">,
              AssemblerPredicate<"FeatureDSP">;
 def HasDSPR2 : Predicate<"Subtarget->hasDSPR2()">,
                AssemblerPredicate<"FeatureDSPR2">;
+def HasDSPR3 : Predicate<"Subtarget->hasDSPR3()">,
+               AssemblerPredicate<"FeatureDSPR3">;
 
 // Fields.
 class Field6<bits<6> val> {
@@ -20,8 +36,11 @@
 def SPECIAL3_OPCODE : Field6<0b011111>;
 def REGIMM_OPCODE : Field6<0b000001>;
 
-class DSPInst : MipsInst<(outs), (ins), "", [], NoItinerary, FrmOther> {
+class DSPInst<string opstr = "">
+    : MipsInst<(outs), (ins), "", [], NoItinerary, FrmOther> {
   let Predicates = [HasDSP];
+  string BaseOpcode = opstr;
+  string Arch = "dsp";
 }
 
 class PseudoDSP<dag outs, dag ins, list<dag> pattern,
Index: lib/Target/Mips/MipsDSPInstrInfo.td
===================================================================
--- lib/Target/Mips/MipsDSPInstrInfo.td
+++ lib/Target/Mips/MipsDSPInstrInfo.td
@@ -1072,7 +1072,7 @@
 
 // Instruction defs.
 // MIPS DSP Rev 1
-def ADDU_QB : ADDU_QB_ENC, ADDU_QB_DESC;
+def ADDU_QB : DspMMRel, ADDU_QB_ENC, ADDU_QB_DESC;
 def ADDU_S_QB : ADDU_S_QB_ENC, ADDU_S_QB_DESC;
 def SUBU_QB : SUBU_QB_ENC, SUBU_QB_DESC;
 def SUBU_S_QB : SUBU_S_QB_ENC, SUBU_S_QB_DESC;
Index: lib/Target/Mips/MipsInstrInfo.td
===================================================================
--- lib/Target/Mips/MipsInstrInfo.td
+++ lib/Target/Mips/MipsInstrInfo.td
@@ -2011,3 +2011,7 @@
 // Micromips64 r6
 include "MicroMips64r6InstrFormats.td"
 include "MicroMips64r6InstrInfo.td"
+
+// Micromips DSP
+include "MicroMipsDSPInstrFormats.td"
+include "MicroMipsDSPInstrInfo.td"
Index: lib/Target/Mips/MipsSEISelLowering.cpp
===================================================================
--- lib/Target/Mips/MipsSEISelLowering.cpp
+++ lib/Target/Mips/MipsSEISelLowering.cpp
@@ -932,7 +932,8 @@
     }
   }
 
-  if ((Ty != MVT::v2i16) && ((Ty != MVT::v4i8) || !Subtarget.hasDSPR2()))
+  if ((Ty != MVT::v2i16) && ((Ty != MVT::v4i8) || (!Subtarget.hasDSPR2() &&
+                                                   !Subtarget.hasDSPR3())))
     return SDValue();
 
   return performDSPShiftCombine(MipsISD::SHRA_DSP, N, Ty, DAG, Subtarget);
@@ -944,7 +945,8 @@
                                  const MipsSubtarget &Subtarget) {
   EVT Ty = N->getValueType(0);
 
-  if (((Ty != MVT::v2i16) || !Subtarget.hasDSPR2()) && (Ty != MVT::v4i8))
+  if (((Ty != MVT::v2i16) || (!Subtarget.hasDSPR2() &&
+                              !Subtarget.hasDSPR3())) && (Ty != MVT::v4i8))
     return SDValue();
 
   return performDSPShiftCombine(MipsISD::SHRL_DSP, N, Ty, DAG, Subtarget);
Index: lib/Target/Mips/MipsSubtarget.h
===================================================================
--- lib/Target/Mips/MipsSubtarget.h
+++ lib/Target/Mips/MipsSubtarget.h
@@ -116,8 +116,8 @@
   // InMicroMips -- can process MicroMips instructions
   bool InMicroMipsMode;
 
-  // HasDSP, HasDSPR2 -- supports DSP ASE.
-  bool HasDSP, HasDSPR2;
+  // HasDSP, HasDSPR2, HasDSPR3 -- supports DSP ASE.
+  bool HasDSP, HasDSPR2, HasDSPR3;
 
   // Allow mixed Mips16 and Mips32 in one source file
   bool AllowMixed16_32;
@@ -234,6 +234,7 @@
   bool inMicroMips64r6Mode() const { return InMicroMipsMode && hasMips64r6(); }
   bool hasDSP() const { return HasDSP; }
   bool hasDSPR2() const { return HasDSPR2; }
+  bool hasDSPR3() const { return HasDSPR3; }
   bool hasMSA() const { return HasMSA; }
   bool useSmallSection() const { return UseSmallSection; }
 
Index: lib/Target/Mips/MipsSubtarget.cpp
===================================================================
--- lib/Target/Mips/MipsSubtarget.cpp
+++ lib/Target/Mips/MipsSubtarget.cpp
@@ -69,8 +69,9 @@
       HasMips3_32(false), HasMips3_32r2(false), HasMips4_32(false),
       HasMips4_32r2(false), HasMips5_32r2(false), InMips16Mode(false),
       InMips16HardFloat(Mips16HardFloat), InMicroMipsMode(false), HasDSP(false),
-      HasDSPR2(false), AllowMixed16_32(Mixed16_32 | Mips_Os16), Os16(Mips_Os16),
-      HasMSA(false), UseTCCInDIV(false), TM(TM), TargetTriple(TT), TSInfo(),
+      HasDSPR2(false), HasDSPR3(false), AllowMixed16_32(Mixed16_32 | Mips_Os16),
+      Os16(Mips_Os16), HasMSA(false), UseTCCInDIV(false), TM(TM),
+      TargetTriple(TT), TSInfo(),
       InstrInfo(
           MipsInstrInfo::create(initializeSubtargetDependencies(CPU, FS, TM))),
       FrameLowering(MipsFrameLowering::create(*this)),
Index: test/MC/Disassembler/Mips/micromips32r6_dsp.txt
===================================================================
--- /dev/null
+++ test/MC/Disassembler/Mips/micromips32r6_dsp.txt
@@ -0,0 +1,4 @@
+# RUN: llvm-mc --disassemble %s -triple=mips-unknown-linux -mcpu=mips32r6 -mattr=micromips  -mattr=+dsp | FileCheck %s
+
+0x00 0xa4 0x18 0xcd # CHECK: addu.qb $3, $4, $5
+
Index: test/MC/Mips/micromips32r6/micromips-dsp-instructioins.s
===================================================================
--- /dev/null
+++ test/MC/Mips/micromips32r6/micromips-dsp-instructioins.s
@@ -0,0 +1,5 @@
+# RUN: llvm-mc %s -triple=mips-unknown-linux -show-encoding -mcpu=mips32r6 -mattr=micromips -mattr=+dsp | FileCheck %s
+
+  .set noat
+  addu.qb $3, $4, $5           # CHECK: addu.qb $3, $4, $5      # encoding: [0x00,0xa4,0x18,0xcd]
+