Index: lib/Target/Mips/Mips32r6InstrFormats.td
===================================================================
--- lib/Target/Mips/Mips32r6InstrFormats.td
+++ lib/Target/Mips/Mips32r6InstrFormats.td
@@ -95,6 +95,8 @@
 def OPCODE6_CLZ      : OPCODE6<0b010000>;
 def OPCODE6_DCLO     : OPCODE6<0b010011>;
 def OPCODE6_DCLZ     : OPCODE6<0b010010>;
+def OPCODE6_LSA      : OPCODE6<0b000101>;
+def OPCODE6_DLSA     : OPCODE6<0b010101>;
 
 class FIELD_FMT<bits<5> Val> {
   bits<5> Value = Val;
@@ -453,6 +455,23 @@
   string DecoderMethod = "DecodeSpecial3LlSc";
 }
 
+class SPECIAL_LSA_FM<OPCODE6 Operation> : MipsR6Inst {
+  bits<5> rd;
+  bits<5> rs;
+  bits<5> rt;
+  bits<2> imm2;
+
+  bits<32> Inst;
+
+  let Inst{31-26} = OPGROUP_SPECIAL.Value;
+  let Inst{25-21} = rs;
+  let Inst{20-16} = rt;
+  let Inst{15-11} = rd;
+  let Inst{10-8}  = 0b000;
+  let Inst{7-6}   = imm2;
+  let Inst{5-0}   = Operation.Value;
+}
+
 class REGIMM_FM<OPCODE5 Operation> : MipsR6Inst {
   bits<5> rs;
   bits<16> imm;
Index: lib/Target/Mips/Mips32r6InstrInfo.td
===================================================================
--- lib/Target/Mips/Mips32r6InstrInfo.td
+++ lib/Target/Mips/Mips32r6InstrInfo.td
@@ -155,6 +155,8 @@
 class SDC2_R6_ENC : COP2LDST_FM<OPCODE5_SDC2>;
 class SWC2_R6_ENC : COP2LDST_FM<OPCODE5_SWC2>;
 
+class LSA_R6_ENC : SPECIAL_LSA_FM<OPCODE6_LSA>;
+
 class LL_R6_ENC : SPECIAL3_LL_SC_FM<OPCODE6_LL>;
 class SC_R6_ENC : SPECIAL3_LL_SC_FM<OPCODE6_SC>;
 
@@ -566,6 +568,16 @@
 class SDC2_R6_DESC : COP2ST_DESC_BASE<"sdc2", COP2Opnd>;
 class SWC2_R6_DESC : COP2ST_DESC_BASE<"swc2", COP2Opnd>;
 
+class LSA_R6_DESC_BASE<string instr_asm, RegisterOperand GPROpnd,
+                       Operand ImmOpnd> {
+  dag OutOperandList = (outs GPROpnd:$rd);
+  dag InOperandList = (ins GPROpnd:$rs, GPROpnd:$rt, ImmOpnd:$imm2);
+  string AsmString = !strconcat(instr_asm, "\t$rd, $rs, $rt, $imm2");
+  list<dag> Pattern = [];
+}
+
+class LSA_R6_DESC : LSA_R6_DESC_BASE<"lsa", GPR32Opnd, uimm2>;
+
 class LL_R6_DESC_BASE<string instr_asm, RegisterOperand GPROpnd> {
   dag OutOperandList = (outs GPROpnd:$rt);
   dag InOperandList = (ins mem_simm9:$addr);
@@ -659,7 +671,7 @@
 def JR_HB_R6 : JR_HB_R6_ENC, JR_HB_R6_DESC, ISA_MIPS32R6;
 def LDC2_R6 : LDC2_R6_ENC, LDC2_R6_DESC, ISA_MIPS32R6;
 def LL_R6 : LL_R6_ENC, LL_R6_DESC, ISA_MIPS32R6;
-// def LSA; // See MSA
+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 LWUPC : LWUPC_ENC, LWUPC_DESC, ISA_MIPS32R6;
Index: lib/Target/Mips/Mips64r6InstrInfo.td
===================================================================
--- lib/Target/Mips/Mips64r6InstrInfo.td
+++ lib/Target/Mips/Mips64r6InstrInfo.td
@@ -29,6 +29,7 @@
 class DCLZ_R6_ENC : SPECIAL_2R_FM<OPCODE6_DCLZ>;
 class DDIV_ENC    : SPECIAL_3R_FM<0b00010, 0b011110>;
 class DDIVU_ENC   : SPECIAL_3R_FM<0b00010, 0b011111>;
+class DLSA_R6_ENC : SPECIAL_LSA_FM<OPCODE6_DLSA>;
 class DMOD_ENC    : SPECIAL_3R_FM<0b00011, 0b011110>;
 class DMODU_ENC   : SPECIAL_3R_FM<0b00011, 0b011111>;
 class DMUH_ENC    : SPECIAL_3R_FM<0b00011, 0b111000>;
@@ -61,6 +62,7 @@
 class DCLZ_R6_DESC : CLZ_R6_DESC_BASE<"dclz", GPR64Opnd>;
 class DDIV_DESC    : DIVMOD_DESC_BASE<"ddiv", GPR64Opnd, sdiv>;
 class DDIVU_DESC   : DIVMOD_DESC_BASE<"ddivu", GPR64Opnd, udiv>;
+class DLSA_R6_DESC : LSA_R6_DESC_BASE<"dlsa", GPR64Opnd, uimm2>;
 class DMOD_DESC    : DIVMOD_DESC_BASE<"dmod", GPR64Opnd, srem>;
 class DMODU_DESC   : DIVMOD_DESC_BASE<"dmodu", GPR64Opnd, urem>;
 class DMUH_DESC    : MUL_R6_DESC_BASE<"dmuh", GPR64Opnd, mulhs>;
@@ -88,7 +90,7 @@
 def DCLZ_R6 : DCLZ_R6_ENC, DCLZ_R6_DESC, ISA_MIPS64R6;
 def DDIV : DDIV_ENC, DDIV_DESC, ISA_MIPS64R6;
 def DDIVU : DDIVU_ENC, DDIVU_DESC, ISA_MIPS64R6;
-// def DLSA; // See MSA
+def DLSA_R6 : DLSA_R6_ENC, DLSA_R6_DESC, ISA_MIPS64R6;
 def DMOD : DMOD_ENC, DMOD_DESC, ISA_MIPS64R6;
 def DMODU : DMODU_ENC, DMODU_DESC, ISA_MIPS64R6;
 def DMUH: DMUH_ENC, DMUH_DESC, ISA_MIPS64R6;
Index: test/MC/Mips/mips32r6/valid.s
===================================================================
--- test/MC/Mips/mips32r6/valid.s
+++ test/MC/Mips/mips32r6/valid.s
@@ -97,6 +97,7 @@
         divu    $2,$3,$4         # CHECK: divu $2, $3, $4  # encoding: [0x00,0x64,0x10,0x9b]
         jialc   $5, 256          # CHECK: jialc $5, 256    # encoding: [0xf8,0x05,0x01,0x00]
         jic     $5, 256          # CHECK: jic $5, 256      # encoding: [0xd8,0x05,0x01,0x00]
+        lsa     $2, $3, $4, 3    # CHECK: lsa  $2, $3, $4, 3 # encoding: [0x00,0x64,0x10,0xc5]
         lwpc    $2,268           # CHECK: lwpc $2, 268     # encoding: [0xec,0x48,0x00,0x43]
         lwupc   $2,268           # CHECK: lwupc $2, 268    # encoding: [0xec,0x50,0x00,0x43]
         mod     $2,$3,$4         # CHECK: mod $2, $3, $4   # encoding: [0x00,0x64,0x10,0xda]
Index: test/MC/Mips/mips64r6/valid.s
===================================================================
--- test/MC/Mips/mips64r6/valid.s
+++ test/MC/Mips/mips64r6/valid.s
@@ -108,6 +108,8 @@
         ddivu   $2,$3,$4         # CHECK: ddivu $2, $3, $4 # encoding: [0x00,0x64,0x10,0x9f]
         dmod    $2,$3,$4         # CHECK: dmod $2, $3, $4  # encoding: [0x00,0x64,0x10,0xde]
         dmodu   $2,$3,$4         # CHECK: dmodu $2, $3, $4 # encoding: [0x00,0x64,0x10,0xdf]
+        lsa     $2, $3, $4, 3    # CHECK: lsa  $2, $3, $4, 3 # encoding: [0x00,0x64,0x10,0xc5]
+        dlsa    $2, $3, $4, 3    # CHECK: dlsa $2, $3, $4, 3 # encoding: [0x00,0x64,0x10,0xd5]
         ldpc    $2,123456        # CHECK: ldpc $2, 123456  # encoding: [0xec,0x58,0x3c,0x48]
         lwpc    $2,268           # CHECK: lwpc $2, 268     # encoding: [0xec,0x48,0x00,0x43]
         lwupc   $2,268           # CHECK: lwupc $2, 268    # encoding: [0xec,0x50,0x00,0x43]