Index: lib/Target/Mips/AsmParser/MipsAsmParser.cpp
===================================================================
--- lib/Target/Mips/AsmParser/MipsAsmParser.cpp
+++ lib/Target/Mips/AsmParser/MipsAsmParser.cpp
@@ -628,6 +628,9 @@
   bool useSoftFloat() const {
     return getSTI().getFeatureBits()[Mips::FeatureSoftFloat];
   }
+  bool hasMT() const {
+    return getSTI().getFeatureBits()[Mips::FeatureMT];
+  }
 
   /// Warn if RegIndex is the same as the current AT.
   void warnIfRegIndexIsAT(unsigned RegIndex, SMLoc Loc);
Index: lib/Target/Mips/MCTargetDesc/MipsABIFlagsSection.h
===================================================================
--- lib/Target/Mips/MCTargetDesc/MipsABIFlagsSection.h
+++ lib/Target/Mips/MCTargetDesc/MipsABIFlagsSection.h
@@ -159,6 +159,8 @@
       ASESet |= Mips::AFL_ASE_MICROMIPS;
     if (P.inMips16Mode())
       ASESet |= Mips::AFL_ASE_MIPS16;
+    if (P.hasMT())
+      ASESet |= Mips::AFL_ASE_MT;
   }
 
   template <class PredicateLibrary>
Index: lib/Target/Mips/Mips.td
===================================================================
--- lib/Target/Mips/Mips.td
+++ lib/Target/Mips/Mips.td
@@ -188,6 +188,8 @@
 def FeatureMadd4 : SubtargetFeature<"nomadd4", "DisableMadd4", "true",
                                     "Disable 4-operand madd.fmt and related instructions">;
 
+def FeatureMT : SubtargetFeature<"mt", "HasMT", "true", "Mips MT ASE">;
+
 //===----------------------------------------------------------------------===//
 // Mips processors supported.
 //===----------------------------------------------------------------------===//
Index: lib/Target/Mips/MipsSubtarget.h
===================================================================
--- lib/Target/Mips/MipsSubtarget.h
+++ lib/Target/Mips/MipsSubtarget.h
@@ -149,6 +149,9 @@
   // related instructions.
   bool DisableMadd4;
 
+  // HasMT -- support MT ASE.
+  bool HasMT;
+
   InstrItineraryData InstrItins;
 
   // We can override the determination of whether we are in mips16 mode
@@ -259,6 +262,7 @@
   bool hasMSA() const { return HasMSA; }
   bool disableMadd4() const { return DisableMadd4; }
   bool hasEVA() const { return HasEVA; }
+  bool hasMT() const { return HasMT; }
   bool useSmallSection() const { return UseSmallSection; }
 
   bool hasStandardEncoding() const { return !inMips16Mode(); }
Index: lib/Target/Mips/MipsSubtarget.cpp
===================================================================
--- lib/Target/Mips/MipsSubtarget.cpp
+++ lib/Target/Mips/MipsSubtarget.cpp
@@ -70,7 +70,8 @@
       InMips16HardFloat(Mips16HardFloat), InMicroMipsMode(false), HasDSP(false),
       HasDSPR2(false), HasDSPR3(false), AllowMixed16_32(Mixed16_32 | Mips_Os16),
       Os16(Mips_Os16), HasMSA(false), UseTCCInDIV(false), HasSym32(false),
-      HasEVA(false), DisableMadd4(false), TM(TM), TargetTriple(TT), TSInfo(),
+      HasEVA(false), DisableMadd4(false), HasMT(false), TM(TM),
+      TargetTriple(TT), TSInfo(),
       InstrInfo(
           MipsInstrInfo::create(initializeSubtargetDependencies(CPU, FS, TM))),
       FrameLowering(MipsFrameLowering::create(*this)),
Index: test/MC/Mips/mt/abiflag.s
===================================================================
--- /dev/null
+++ test/MC/Mips/mt/abiflag.s
@@ -0,0 +1,9 @@
+# RUN: llvm-mc < %s -arch=mips -mcpu=mips32r2 -mattr=+mt -filetype=obj -o - \
+# RUN:   | llvm-objdump -D -
+
+# Test that the usage of the MT ASE is recorded in .MIPS.abiflags
+
+# CHECK-LABEL: .MIPS.abiflags:
+# CHECK:              c:  00 00 00 40   ssnop
+ .text
+  nop