Index: lib/Target/Mips/MicroMips32r6InstrFormats.td
===================================================================
--- lib/Target/Mips/MicroMips32r6InstrFormats.td
+++ lib/Target/Mips/MicroMips32r6InstrFormats.td
@@ -183,3 +183,22 @@
   let Inst{8-6}   = 0b000;
   let Inst{5-0}   = funct;
 }
+
+class ERET_FM_MMR6<string instr_asm, bits<10> funct> : MMR6Arch<instr_asm> {
+  bits<32> Inst;
+
+  let Inst{31-26} = 0x00;
+  let Inst{25-16} = 0x00;
+  let Inst{15-6}  = funct;
+  let Inst{5-0}   = 0x3c;
+}
+
+class ERETNC_FM_MMR6<string instr_asm, bits<10> funct> : MMR6Arch<instr_asm> {
+  bits<32> Inst;
+
+  let Inst{31-26} = 0x00;
+  let Inst{25-17} = 0x00;
+  let Inst{16-16} = 0x01;
+  let Inst{15-6}  = funct;
+  let Inst{5-0}   = 0x3c;
+}
Index: lib/Target/Mips/MicroMips32r6InstrInfo.td
===================================================================
--- lib/Target/Mips/MicroMips32r6InstrInfo.td
+++ lib/Target/Mips/MicroMips32r6InstrInfo.td
@@ -32,6 +32,8 @@
 class CLZ_MMR6_ENC : SPECIAL_2R_FM_MMR6<0b010000>;
 class DIV_MMR6_ENC : ARITH_FM_MMR6<"div", 0x118>;
 class DIVU_MMR6_ENC : ARITH_FM_MMR6<"divu", 0x198>;
+class ERET_MMR6_ENC : ERET_FM_MMR6<"eret", 0x3cd>;
+class ERETNC_MMR6_ENC : ERETNC_FM_MMR6<"eretnc", 0x3cd>;
 class JIALC_MMR6_ENC : JMP_IDX_COMPACT_FM<0b100000>;
 class JIC_MMR6_ENC   : JMP_IDX_COMPACT_FM<0b101000>;
 class LSA_MMR6_ENC : POOL32A_LSA_FM<0b001111>;
@@ -110,6 +112,9 @@
 class CLO_MMR6_DESC : CLO_CLZ_MMR6_DESC_BASE<"clo", GPR32Opnd>;
 class CLZ_MMR6_DESC : CLO_CLZ_MMR6_DESC_BASE<"clz", GPR32Opnd>;
 
+class ERET_MMR6_DESC : ER_FT<"eret">;
+class ERETNC_MMR6_DESC : ER_FT<"eretnc">;
+
 class JMP_MMR6_IDX_COMPACT_DESC_BASE<string opstr, DAGOperand opnd,
                                      RegisterOperand GPROpnd>
     : MMR6Arch<opstr> {
@@ -225,6 +230,8 @@
 def CLZ_MMR6 : R6MMR6Rel, CLZ_MMR6_ENC, CLZ_MMR6_DESC, ISA_MICROMIPS32R6;
 def DIV_MMR6 : R6MMR6Rel, DIV_MMR6_DESC, DIV_MMR6_ENC, ISA_MICROMIPS32R6;
 def DIVU_MMR6 : R6MMR6Rel, DIVU_MMR6_DESC, DIVU_MMR6_ENC, ISA_MICROMIPS32R6;
+def ERET_MMR6 : R6MMR6Rel, ERET_MMR6_DESC, ERET_MMR6_ENC, ISA_MICROMIPS32R6;
+def ERETNC_MMR6 : R6MMR6Rel, ERETNC_MMR6_DESC, ERETNC_MMR6_ENC, ISA_MICROMIPS32R6;
 def JIALC_MMR6 : R6MMR6Rel, JIALC_MMR6_ENC, JIALC_MMR6_DESC, ISA_MICROMIPS32R6;
 def JIC_MMR6 : R6MMR6Rel, JIC_MMR6_ENC, JIC_MMR6_DESC, ISA_MICROMIPS32R6;
 def LSA_MMR6 : R6MMR6Rel, LSA_MMR6_ENC, LSA_MMR6_DESC, ISA_MICROMIPS32R6;
Index: lib/Target/Mips/MipsInstrInfo.td
===================================================================
--- lib/Target/Mips/MipsInstrInfo.td
+++ lib/Target/Mips/MipsInstrInfo.td
@@ -1272,7 +1272,9 @@
 def TRAP : TrapBase<BREAK>;
 def SDBBP : MMRel, SYS_FT<"sdbbp">, SDBBP_FM, ISA_MIPS32_NOT_32R6_64R6;
 
+let AdditionalPredicates = [NotInMicroMips] in {
 def ERET : MMRel, ER_FT<"eret">, ER_FM<0x18>, INSN_MIPS3_32;
+}
 def DERET : MMRel, ER_FT<"deret">, ER_FM<0x1f>, ISA_MIPS32;
 
 def EI : MMRel, DEI_FT<"ei", GPR32Opnd>, EI_FM<1>, ISA_MIPS32R2;
Index: test/MC/Disassembler/Mips/micromips32r6.txt
===================================================================
--- test/MC/Disassembler/Mips/micromips32r6.txt
+++ test/MC/Disassembler/Mips/micromips32r6.txt
@@ -36,6 +36,10 @@
 
 0x00 0xa4 0x19 0x98 # CHECK: divu $3, $4, $5
 
+0x00 0x00 0xf3 0x7c # CHECK: eret
+
+0x00 0x01 0xf3 0x7c # CHECK: eretnc
+
 0x80 0x05 0x01 0x00 # CHECK: jialc $5, 256
 
 0xa0 0x05 0x01 0x00 # CHECK: jic $5, 256
Index: test/MC/Mips/micromips32r6/valid.s
===================================================================
--- test/MC/Mips/micromips32r6/valid.s
+++ test/MC/Mips/micromips32r6/valid.s
@@ -17,6 +17,8 @@
   clz $sp, $gp             # CHECK: clz $sp, $gp        # encoding: [0x03,0x80,0xe8,0x50]
   div $3, $4, $5           # CHECK: div $3, $4, $5      # encoding: [0x00,0xa4,0x19,0x18]
   divu $3, $4, $5          # CHECK: divu $3, $4, $5     # encoding: [0x00,0xa4,0x19,0x98]
+  eret                     # CHECK: eret                # encoding: [0x00,0x00,0xf3,0x7c]
+  eretnc                   # CHECK: eretnc              # encoding: [0x00,0x01,0xf3,0x7c]
   jialc $5, 256            # CHECK: jialc $5, 256       # encoding: [0x80,0x05,0x01,0x00]
   jic   $5, 256            # CHECK: jic $5, 256         # encoding: [0xa0,0x05,0x01,0x00]
   lsa $2, $3, $4, 3        # CHECK: lsa  $2, $3, $4, 3  # encoding: [0x00,0x43,0x26,0x0f]