Index: lib/Target/Mips/MicroMips32r6InstrFormats.td
===================================================================
--- lib/Target/Mips/MicroMips32r6InstrFormats.td
+++ lib/Target/Mips/MicroMips32r6InstrFormats.td
@@ -15,3 +15,15 @@
   string Arch = "micromipsr6";
   string BaseOpcode = opstr;
 }
+
+class PCREL19_FM_MMR6<bits<2> funct> : MipsR6Inst {
+  bits<5> rt;
+  bits<19> imm;
+
+  bits<32> Inst;
+
+  let Inst{31-26} = 0b011110;
+  let Inst{25-21} = rt;
+  let Inst{20-19} = funct;
+  let Inst{18-0}  = imm;
+}
Index: lib/Target/Mips/MicroMips32r6InstrInfo.td
===================================================================
--- lib/Target/Mips/MicroMips32r6InstrInfo.td
+++ lib/Target/Mips/MicroMips32r6InstrInfo.td
@@ -17,10 +17,12 @@
 //
 //===----------------------------------------------------------------------===//
 
+class ADDIUPC_MMR6_ENC : PCREL19_FM_MMR6<0b00>;
 class BALC_MMR6_ENC  : BRANCH_OFF26_FM<0b101101>;
 class BC_MMR6_ENC : BRANCH_OFF26_FM<0b100101>;
 class JIALC_MMR6_ENC : JMP_IDX_COMPACT_FM<0b101001>;
 class JIC_MMR6_ENC   : JMP_IDX_COMPACT_FM<0b101000>;
+class LWPC_MMR6_ENC  : PCREL19_FM_MMR6<0b01>;
 
 //===----------------------------------------------------------------------===//
 //
@@ -28,6 +30,17 @@
 //
 //===----------------------------------------------------------------------===//
 
+class PCREL_MMR6_DESC_BASE<string instr_asm, RegisterOperand GPROpnd,
+                           Operand ImmOpnd> : MMR6Arch<instr_asm> {
+  dag OutOperandList = (outs GPROpnd:$rt);
+  dag InOperandList = (ins ImmOpnd:$imm);
+  string AsmString = !strconcat(instr_asm, "\t$rt, $imm");
+  list<dag> Pattern = [];
+}
+
+class ADDIUPC_MMR6_DESC : PCREL_MMR6_DESC_BASE<"addiupc", GPR32Opnd, simm19_lsl2>;
+class LWPC_MMR6_DESC: PCREL_MMR6_DESC_BASE<"lwpc", GPR32Opnd, simm19_lsl2>;
+
 class BC_MMR6_DESC_BASE<string instr_asm, DAGOperand opnd>
     : BRANCH_DESC_BASE, MMR6Arch<instr_asm> {
   dag InOperandList = (ins opnd:$offset);
@@ -70,7 +83,10 @@
 //
 //===----------------------------------------------------------------------===//
 
+def ADDIUPC_MMR6 : R6MMR6Rel, ADDIUPC_MMR6_ENC, ADDIUPC_MMR6_DESC,
+                   ISA_MICROMIPS32R6;
 def BALC_MMR6 : R6MMR6Rel, BALC_MMR6_ENC, BALC_MMR6_DESC, ISA_MICROMIPS32R6;
 def BC_MMR6 : R6MMR6Rel, BC_MMR6_ENC, BC_MMR6_DESC, 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 LWPC_MMR6 : R6MMR6Rel, LWPC_MMR6_ENC, LWPC_MMR6_DESC, ISA_MICROMIPS32R6;
Index: lib/Target/Mips/Mips32r6InstrInfo.td
===================================================================
--- lib/Target/Mips/Mips32r6InstrInfo.td
+++ lib/Target/Mips/Mips32r6InstrInfo.td
@@ -243,7 +243,7 @@
 //===----------------------------------------------------------------------===//
 
 class PCREL_DESC_BASE<string instr_asm, RegisterOperand GPROpnd,
-                      Operand ImmOpnd> {
+                      Operand ImmOpnd> : MipsR6Arch<instr_asm> {
   dag OutOperandList = (outs GPROpnd:$rs);
   dag InOperandList = (ins ImmOpnd:$imm);
   string AsmString = !strconcat(instr_asm, "\t$rs, $imm");
@@ -644,7 +644,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-def ADDIUPC : ADDIUPC_ENC, ADDIUPC_DESC, ISA_MIPS32R6;
+def ADDIUPC : R6MMR6Rel, ADDIUPC_ENC, ADDIUPC_DESC, ISA_MIPS32R6;
 def ALIGN : ALIGN_ENC, ALIGN_DESC, ISA_MIPS32R6;
 def ALUIPC : ALUIPC_ENC, ALUIPC_DESC, ISA_MIPS32R6;
 def AUI : AUI_ENC, AUI_DESC, ISA_MIPS32R6;
@@ -693,7 +693,7 @@
 def LL_R6 : LL_R6_ENC, LL_R6_DESC, ISA_MIPS32R6;
 def LSA_R6 : LSA_R6_ENC, LSA_R6_DESC, ISA_MIPS32R6;
 def LWC2_R6 : LWC2_R6_ENC, LWC2_R6_DESC, ISA_MIPS32R6;
-def LWPC : LWPC_ENC, LWPC_DESC, ISA_MIPS32R6;
+def LWPC : R6MMR6Rel, LWPC_ENC, LWPC_DESC, ISA_MIPS32R6;
 def LWUPC : LWUPC_ENC, LWUPC_DESC, ISA_MIPS32R6;
 def MADDF_S : MADDF_S_ENC, MADDF_S_DESC, ISA_MIPS32R6;
 def MADDF_D : MADDF_D_ENC, MADDF_D_DESC, ISA_MIPS32R6;
Index: test/MC/Mips/micromips32r6/valid.s
===================================================================
--- test/MC/Mips/micromips32r6/valid.s
+++ test/MC/Mips/micromips32r6/valid.s
@@ -1,7 +1,9 @@
 # RUN: llvm-mc %s -triple=mips-unknown-linux -show-encoding -mcpu=mips32r6 -mattr=micromips | FileCheck %s
 
   .set noat
+  addiupc $4, 100          # CHECK: addiupc $4, 100     # encoding: [0x78,0x80,0x00,0x19]
   balc 14572256            # CHECK: balc 14572256       # encoding: [0xb4,0x37,0x96,0xb8]
   bc 14572256              # CHECK: bc 14572256         # encoding: [0x94,0x37,0x96,0xb8]
   jialc $5, 256            # CHECK: jialc $5, 256       # encoding: [0xa4,0x05,0x01,0x00]
   jic   $5, 256            # CHECK: jic $5, 256         # encoding: [0xa0,0x05,0x01,0x00]
+  lwpc    $2,268           # CHECK: lwpc $2, 268        # encoding: [0x78,0x48,0x00,0x43]