diff --git a/llvm/lib/Target/PowerPC/PPCInstrPrefix.td b/llvm/lib/Target/PowerPC/PPCInstrPrefix.td
--- a/llvm/lib/Target/PowerPC/PPCInstrPrefix.td
+++ b/llvm/lib/Target/PowerPC/PPCInstrPrefix.td
@@ -43,8 +43,8 @@
   string BaseName = "";
 }
 
-class MLS_DForm_R_D34_RTA5<bits<6> opcode, dag OOL, dag IOL, string asmstr,
-                           InstrItinClass itin, list<dag> pattern>
+class MLS_DForm_R_SI34_FRS5<bits<6> opcode, dag OOL, dag IOL, string asmstr,
+                            InstrItinClass itin, list<dag> pattern>
   : PI<1, opcode, OOL, IOL, asmstr, itin> {
   bits<5> FRS;
   bits<39> D_RA;
@@ -86,8 +86,8 @@
   let Inst{48-63} = SI{15-0};
 }
 
-class MLS_DForm2_r0<bits<6> opcode, dag OOL, dag IOL, string asmstr,
-                    InstrItinClass itin, list<dag> pattern>
+class MLS_DForm_SI34_RT5<bits<6> opcode, dag OOL, dag IOL, string asmstr,
+                         InstrItinClass itin, list<dag> pattern>
   : PI<1, opcode, OOL, IOL, asmstr, itin> {
   bits<5> RT;
   bits<34> SI;
@@ -116,8 +116,8 @@
                                  !strconcat(asmstr, ", 1"), itin, []>, isPCRel;
 }
 
-class 8LS_DForm_R_D34_RTA5<bits<6> opcode, dag OOL, dag IOL, string asmstr,
-                           InstrItinClass itin, list<dag> pattern>
+class 8LS_DForm_R_SI34_RTA5<bits<6> opcode, dag OOL, dag IOL, string asmstr,
+                            InstrItinClass itin, list<dag> pattern>
   : PI<1, opcode, OOL, IOL, asmstr, itin> {
   bits<5> RT;
   bits<39> D_RA;
@@ -138,8 +138,8 @@
 
 // 8LS:D-Form: [ 1 0 0 // R // d0
 //               PO TX T RA d1 ]
-class 8LS_DForm_R_D34_XT6_RA5<bits<5> opcode, dag OOL, dag IOL, string asmstr,
-                              InstrItinClass itin, list<dag> pattern>
+class 8LS_DForm_R_SI34_XT6_RA5<bits<5> opcode, dag OOL, dag IOL, string asmstr,
+                               InstrItinClass itin, list<dag> pattern>
   : PI<1, { opcode, ? }, OOL, IOL, asmstr, itin> {
   bits<6> XT;
   bits<39> D_RA;
@@ -161,33 +161,33 @@
   let Inst{48-63} = D_RA{15-0}; // d1
 }
 
-multiclass MLS_DForm_R_D34_RTA5_p<bits<6> opcode, dag OOL, dag IOL,
-                                  dag PCRel_IOL, string asmstr,
-                                  InstrItinClass itin> {
-  def NAME : MLS_DForm_R_D34_RTA5<opcode, OOL, IOL,
-                                  !strconcat(asmstr, ", 0"), itin, []>;
-  def pc : MLS_DForm_R_D34_RTA5<opcode, OOL, PCRel_IOL,
-                                !strconcat(asmstr, ", 1"), itin, []>,
-                                isPCRel;
+multiclass MLS_DForm_R_SI34_FRS5_p<bits<6> opcode, dag OOL, dag IOL,
+                                   dag PCRel_IOL, string asmstr,
+                                   InstrItinClass itin> {
+  def NAME : MLS_DForm_R_SI34_FRS5<opcode, OOL, IOL,
+                                   !strconcat(asmstr, ", 0"), itin, []>;
+  def pc : MLS_DForm_R_SI34_FRS5<opcode, OOL, PCRel_IOL,
+                                 !strconcat(asmstr, ", 1"), itin, []>,
+                                 isPCRel;
 }
 
-multiclass 8LS_DForm_R_D34_RTA5_p<bits<6> opcode, dag OOL, dag IOL,
-                                  dag PCRel_IOL, string asmstr,
-                                  InstrItinClass itin> {
-  def NAME : 8LS_DForm_R_D34_RTA5<opcode, OOL, IOL,
-                                  !strconcat(asmstr, ", 0"), itin, []>;
-  def pc : 8LS_DForm_R_D34_RTA5<opcode, OOL, PCRel_IOL,
-                                !strconcat(asmstr, ", 1"), itin, []>, isPCRel;
+multiclass 8LS_DForm_R_SI34_RTA5_p<bits<6> opcode, dag OOL, dag IOL,
+                                   dag PCRel_IOL, string asmstr,
+                                   InstrItinClass itin> {
+  def NAME : 8LS_DForm_R_SI34_RTA5<opcode, OOL, IOL,
+                                   !strconcat(asmstr, ", 0"), itin, []>;
+  def pc : 8LS_DForm_R_SI34_RTA5<opcode, OOL, PCRel_IOL,
+                                 !strconcat(asmstr, ", 1"), itin, []>, isPCRel;
 }
 
-multiclass 8LS_DForm_R_D34_XT6_RA5_p<bits<5> opcode, dag OOL, dag IOL,
-                                     dag PCRel_IOL, string asmstr,
-                                     InstrItinClass itin> {
-  def NAME : 8LS_DForm_R_D34_XT6_RA5<opcode, OOL, IOL,
-                                     !strconcat(asmstr, ", 0"), itin, []>;
-  def pc : 8LS_DForm_R_D34_XT6_RA5<opcode, OOL, PCRel_IOL,
-                                   !strconcat(asmstr, ", 1"), itin, []>,
-                                   isPCRel;
+multiclass 8LS_DForm_R_SI34_XT6_RA5_p<bits<5> opcode, dag OOL, dag IOL,
+                                      dag PCRel_IOL, string asmstr,
+                                      InstrItinClass itin> {
+  def NAME : 8LS_DForm_R_SI34_XT6_RA5<opcode, OOL, IOL,
+                                      !strconcat(asmstr, ", 0"), itin, []>;
+  def pc : 8LS_DForm_R_SI34_XT6_RA5<opcode, OOL, PCRel_IOL,
+                                    !strconcat(asmstr, ", 1"), itin, []>,
+                                    isPCRel;
 }
 
 def PrefixInstrs : Predicate<"PPCSubTarget->hasPrefixInstrs()">;
@@ -199,9 +199,9 @@
                               (ins immZero:$RA, s34imm:$SI),
                               "paddi $RT, $RA, $SI", IIC_LdStLFD>;
     let isReMaterializable = 1, isAsCheapAsAMove = 1, isMoveImm = 1 in {
-      def PLI8 : MLS_DForm2_r0<14, (outs g8rc:$RT),
-                               (ins s34imm:$SI),
-                               "pli $RT, $SI", IIC_IntSimple, []>;
+      def PLI8 : MLS_DForm_SI34_RT5<14, (outs g8rc:$RT),
+                                    (ins s34imm:$SI),
+                                    "pli $RT, $SI", IIC_IntSimple, []>;
     }
   }
   defm PADDI :
@@ -209,131 +209,131 @@
                             (ins immZero:$RA, s34imm:$SI),
                             "paddi $RT, $RA, $SI", IIC_LdStLFD>;
   let isReMaterializable = 1, isAsCheapAsAMove = 1, isMoveImm = 1 in {
-    def PLI : MLS_DForm2_r0<14, (outs gprc:$RT),
-                            (ins s34imm:$SI),
-                            "pli $RT, $SI", IIC_IntSimple, []>;
+    def PLI : MLS_DForm_SI34_RT5<14, (outs gprc:$RT),
+                                 (ins s34imm:$SI),
+                                 "pli $RT, $SI", IIC_IntSimple, []>;
   }
 
   let mayLoad = 1, mayStore = 0 in {
     defm PLXV :
-      8LS_DForm_R_D34_XT6_RA5_p<25, (outs vsrc:$XT), (ins memri34:$D_RA),
-                                (ins memri34_pcrel:$D_RA), "plxv $XT, $D_RA",
-                                IIC_LdStLFD>;
+      8LS_DForm_R_SI34_XT6_RA5_p<25, (outs vsrc:$XT), (ins memri34:$D_RA),
+                                 (ins memri34_pcrel:$D_RA), "plxv $XT, $D_RA",
+                                 IIC_LdStLFD>;
     defm PLFS :
-      MLS_DForm_R_D34_RTA5_p<48, (outs f4rc:$FRT), (ins memri34:$D_RA),
-                             (ins memri34_pcrel:$D_RA), "plfs $FRT, $D_RA",
-                             IIC_LdStLFD>;
+      MLS_DForm_R_SI34_FRS5_p<48, (outs f4rc:$FRT), (ins memri34:$D_RA),
+                              (ins memri34_pcrel:$D_RA), "plfs $FRT, $D_RA",
+                              IIC_LdStLFD>;
     defm PLFD :
-      MLS_DForm_R_D34_RTA5_p<50, (outs f8rc:$FRT), (ins memri34:$D_RA),
-                             (ins  memri34_pcrel:$D_RA), "plfd $FRT, $D_RA",
-                             IIC_LdStLFD>;
+      MLS_DForm_R_SI34_FRS5_p<50, (outs f8rc:$FRT), (ins memri34:$D_RA),
+                              (ins  memri34_pcrel:$D_RA), "plfd $FRT, $D_RA",
+                              IIC_LdStLFD>;
     defm PLXSSP :
-      8LS_DForm_R_D34_RTA5_p<43, (outs vfrc:$VRT), (ins memri34:$D_RA),
-                             (ins memri34_pcrel:$D_RA), "plxssp $VRT, $D_RA",
-                             IIC_LdStLFD>;
+      8LS_DForm_R_SI34_RTA5_p<43, (outs vfrc:$VRT), (ins memri34:$D_RA),
+                              (ins memri34_pcrel:$D_RA), "plxssp $VRT, $D_RA",
+                              IIC_LdStLFD>;
     defm PLXSD :
-      8LS_DForm_R_D34_RTA5_p<42, (outs vfrc:$VRT), (ins memri34:$D_RA),
-                             (ins memri34_pcrel:$D_RA), "plxsd $VRT, $D_RA",
-                             IIC_LdStLFD>;
+      8LS_DForm_R_SI34_RTA5_p<42, (outs vfrc:$VRT), (ins memri34:$D_RA),
+                              (ins memri34_pcrel:$D_RA), "plxsd $VRT, $D_RA",
+                              IIC_LdStLFD>;
     let Interpretation64Bit = 1, isCodeGenOnly = 1 in {
       defm PLBZ8 :
-        MLS_DForm_R_D34_RTA5_p<34, (outs g8rc:$RT), (ins memri34:$D_RA),
-                               (ins memri34_pcrel:$D_RA), "plbz $RT, $D_RA",
-                               IIC_LdStLFD>;
+        MLS_DForm_R_SI34_FRS5_p<34, (outs g8rc:$RT), (ins memri34:$D_RA),
+                                (ins memri34_pcrel:$D_RA), "plbz $RT, $D_RA",
+                                IIC_LdStLFD>;
       defm PLHZ8 :
-        MLS_DForm_R_D34_RTA5_p<40, (outs g8rc:$RT), (ins memri34:$D_RA),
-                               (ins memri34_pcrel:$D_RA), "plhz $RT, $D_RA",
-                               IIC_LdStLFD>;
+        MLS_DForm_R_SI34_FRS5_p<40, (outs g8rc:$RT), (ins memri34:$D_RA),
+                                (ins memri34_pcrel:$D_RA), "plhz $RT, $D_RA",
+                                IIC_LdStLFD>;
       defm PLHA8 :
-        MLS_DForm_R_D34_RTA5_p<42, (outs g8rc:$RT), (ins memri34:$D_RA),
-                               (ins memri34_pcrel:$D_RA), "plha $RT, $D_RA",
-                               IIC_LdStLFD>;
+        MLS_DForm_R_SI34_FRS5_p<42, (outs g8rc:$RT), (ins memri34:$D_RA),
+                                (ins memri34_pcrel:$D_RA), "plha $RT, $D_RA",
+                                IIC_LdStLFD>;
       defm PLWA8 :
-        8LS_DForm_R_D34_RTA5_p<41, (outs g8rc:$RT), (ins memri34:$D_RA),
-                               (ins memri34_pcrel:$D_RA), "plwa $RT, $D_RA",
-                               IIC_LdStLFD>;
+        8LS_DForm_R_SI34_RTA5_p<41, (outs g8rc:$RT), (ins memri34:$D_RA),
+                                (ins memri34_pcrel:$D_RA), "plwa $RT, $D_RA",
+                                IIC_LdStLFD>;
       defm PLWZ8 :
-        MLS_DForm_R_D34_RTA5_p<32, (outs g8rc:$RT), (ins memri34:$D_RA),
-                               (ins memri34_pcrel:$D_RA), "plwz $RT, $D_RA",
-                               IIC_LdStLFD>;
+        MLS_DForm_R_SI34_FRS5_p<32, (outs g8rc:$RT), (ins memri34:$D_RA),
+                                (ins memri34_pcrel:$D_RA), "plwz $RT, $D_RA",
+                                IIC_LdStLFD>;
     }
     defm PLBZ :
-      MLS_DForm_R_D34_RTA5_p<34, (outs gprc:$RT), (ins memri34:$D_RA),
-                             (ins memri34_pcrel:$D_RA), "plbz $RT, $D_RA",
-                             IIC_LdStLFD>;
+      MLS_DForm_R_SI34_FRS5_p<34, (outs gprc:$RT), (ins memri34:$D_RA),
+                              (ins memri34_pcrel:$D_RA), "plbz $RT, $D_RA",
+                              IIC_LdStLFD>;
     defm PLHZ :
-      MLS_DForm_R_D34_RTA5_p<40, (outs gprc:$RT), (ins memri34:$D_RA),
-                             (ins memri34_pcrel:$D_RA), "plhz $RT, $D_RA",
-                             IIC_LdStLFD>;
+      MLS_DForm_R_SI34_FRS5_p<40, (outs gprc:$RT), (ins memri34:$D_RA),
+                              (ins memri34_pcrel:$D_RA), "plhz $RT, $D_RA",
+                              IIC_LdStLFD>;
     defm PLHA :
-      MLS_DForm_R_D34_RTA5_p<42, (outs gprc:$RT), (ins memri34:$D_RA),
-                             (ins memri34_pcrel:$D_RA), "plha $RT, $D_RA",
-                             IIC_LdStLFD>;
+      MLS_DForm_R_SI34_FRS5_p<42, (outs gprc:$RT), (ins memri34:$D_RA),
+                              (ins memri34_pcrel:$D_RA), "plha $RT, $D_RA",
+                              IIC_LdStLFD>;
     defm PLWZ :
-      MLS_DForm_R_D34_RTA5_p<32, (outs gprc:$RT), (ins memri34:$D_RA),
-                             (ins memri34_pcrel:$D_RA), "plwz $RT, $D_RA",
-                             IIC_LdStLFD>;
+      MLS_DForm_R_SI34_FRS5_p<32, (outs gprc:$RT), (ins memri34:$D_RA),
+                              (ins memri34_pcrel:$D_RA), "plwz $RT, $D_RA",
+                              IIC_LdStLFD>;
     defm PLWA :
-      8LS_DForm_R_D34_RTA5_p<41, (outs gprc:$RT), (ins memri34:$D_RA),
-                             (ins memri34_pcrel:$D_RA), "plwa $RT, $D_RA",
-                             IIC_LdStLFD>;
+      8LS_DForm_R_SI34_RTA5_p<41, (outs gprc:$RT), (ins memri34:$D_RA),
+                              (ins memri34_pcrel:$D_RA), "plwa $RT, $D_RA",
+                              IIC_LdStLFD>;
     defm PLD :
-      8LS_DForm_R_D34_RTA5_p<57, (outs g8rc:$RT), (ins memri34:$D_RA),
-                             (ins memri34_pcrel:$D_RA), "pld $RT, $D_RA",
-                             IIC_LdStLFD>;
+      8LS_DForm_R_SI34_RTA5_p<57, (outs g8rc:$RT), (ins memri34:$D_RA),
+                              (ins memri34_pcrel:$D_RA), "pld $RT, $D_RA",
+                              IIC_LdStLFD>;
   }
 
   let mayStore = 1, mayLoad = 0 in {
     defm PSTXV :
-      8LS_DForm_R_D34_XT6_RA5_p<27, (outs), (ins vsrc:$XS, memri34:$D_RA),
+      8LS_DForm_R_SI34_XT6_RA5_p<27, (outs), (ins vsrc:$XS, memri34:$D_RA),
                                 (ins vsrc:$XS, memri34_pcrel:$D_RA),
                                 "pstxv $XS, $D_RA", IIC_LdStLFD>;
     defm PSTFS :
-      MLS_DForm_R_D34_RTA5_p<52, (outs), (ins f4rc:$FRS, memri34:$D_RA),
-                             (ins f4rc:$FRS, memri34_pcrel:$D_RA),
-                             "pstfs $FRS, $D_RA", IIC_LdStLFD>;
+      MLS_DForm_R_SI34_FRS5_p<52, (outs), (ins f4rc:$FRS, memri34:$D_RA),
+                              (ins f4rc:$FRS, memri34_pcrel:$D_RA),
+                              "pstfs $FRS, $D_RA", IIC_LdStLFD>;
     defm PSTFD :
-      MLS_DForm_R_D34_RTA5_p<54, (outs), (ins f8rc:$FRS, memri34:$D_RA),
-                             (ins f8rc:$FRS, memri34_pcrel:$D_RA),
-                             "pstfd $FRS, $D_RA", IIC_LdStLFD>;
+      MLS_DForm_R_SI34_FRS5_p<54, (outs), (ins f8rc:$FRS, memri34:$D_RA),
+                              (ins f8rc:$FRS, memri34_pcrel:$D_RA),
+                              "pstfd $FRS, $D_RA", IIC_LdStLFD>;
     defm PSTXSSP :
-      8LS_DForm_R_D34_RTA5_p<47, (outs), (ins vfrc:$VRS, memri34:$D_RA),
-                             (ins vfrc:$VRS, memri34_pcrel:$D_RA),
-                             "pstxssp $VRS, $D_RA", IIC_LdStLFD>;
+      8LS_DForm_R_SI34_RTA5_p<47, (outs), (ins vfrc:$VRS, memri34:$D_RA),
+                              (ins vfrc:$VRS, memri34_pcrel:$D_RA),
+                              "pstxssp $VRS, $D_RA", IIC_LdStLFD>;
     defm PSTXSD :
-      8LS_DForm_R_D34_RTA5_p<46, (outs), (ins vfrc:$VRS, memri34:$D_RA),
-                             (ins vfrc:$VRS, memri34_pcrel:$D_RA),
-                             "pstxsd $VRS, $D_RA", IIC_LdStLFD>;
+      8LS_DForm_R_SI34_RTA5_p<46, (outs), (ins vfrc:$VRS, memri34:$D_RA),
+                              (ins vfrc:$VRS, memri34_pcrel:$D_RA),
+                              "pstxsd $VRS, $D_RA", IIC_LdStLFD>;
     let Interpretation64Bit = 1, isCodeGenOnly = 1 in {
       defm PSTB8 :
-        MLS_DForm_R_D34_RTA5_p<38, (outs), (ins g8rc:$RS, memri34:$D_RA),
-                               (ins g8rc:$RS, memri34_pcrel:$D_RA),
-                               "pstb $RS, $D_RA", IIC_LdStLFD>;
+        MLS_DForm_R_SI34_FRS5_p<38, (outs), (ins g8rc:$RS, memri34:$D_RA),
+                                (ins g8rc:$RS, memri34_pcrel:$D_RA),
+                                "pstb $RS, $D_RA", IIC_LdStLFD>;
       defm PSTH8 :
-        MLS_DForm_R_D34_RTA5_p<44, (outs), (ins g8rc:$RS, memri34:$D_RA),
-                               (ins g8rc:$RS, memri34_pcrel:$D_RA),
-                               "psth $RS, $D_RA", IIC_LdStLFD>;
+        MLS_DForm_R_SI34_FRS5_p<44, (outs), (ins g8rc:$RS, memri34:$D_RA),
+                                (ins g8rc:$RS, memri34_pcrel:$D_RA),
+                                "psth $RS, $D_RA", IIC_LdStLFD>;
       defm PSTW8 :
-        MLS_DForm_R_D34_RTA5_p<36, (outs), (ins g8rc:$RS, memri34:$D_RA),
-                               (ins g8rc:$RS, memri34_pcrel:$D_RA),
-                               "pstw $RS, $D_RA", IIC_LdStLFD>;
+        MLS_DForm_R_SI34_FRS5_p<36, (outs), (ins g8rc:$RS, memri34:$D_RA),
+                                (ins g8rc:$RS, memri34_pcrel:$D_RA),
+                                "pstw $RS, $D_RA", IIC_LdStLFD>;
     }
     defm PSTB :
-      MLS_DForm_R_D34_RTA5_p<38, (outs), (ins gprc:$RS, memri34:$D_RA),
-                             (ins gprc:$RS, memri34_pcrel:$D_RA),
-                             "pstb $RS, $D_RA", IIC_LdStLFD>;
+      MLS_DForm_R_SI34_FRS5_p<38, (outs), (ins gprc:$RS, memri34:$D_RA),
+                              (ins gprc:$RS, memri34_pcrel:$D_RA),
+                              "pstb $RS, $D_RA", IIC_LdStLFD>;
     defm PSTH :
-      MLS_DForm_R_D34_RTA5_p<44, (outs), (ins gprc:$RS, memri34:$D_RA),
-                             (ins gprc:$RS, memri34_pcrel:$D_RA),
-                             "psth $RS, $D_RA", IIC_LdStLFD>;
+      MLS_DForm_R_SI34_FRS5_p<44, (outs), (ins gprc:$RS, memri34:$D_RA),
+                              (ins gprc:$RS, memri34_pcrel:$D_RA),
+                              "psth $RS, $D_RA", IIC_LdStLFD>;
     defm PSTW :
-      MLS_DForm_R_D34_RTA5_p<36, (outs), (ins gprc:$RS, memri34:$D_RA),
-                             (ins gprc:$RS, memri34_pcrel:$D_RA),
-                             "pstw $RS, $D_RA", IIC_LdStLFD>;
+      MLS_DForm_R_SI34_FRS5_p<36, (outs), (ins gprc:$RS, memri34:$D_RA),
+                              (ins gprc:$RS, memri34_pcrel:$D_RA),
+                              "pstw $RS, $D_RA", IIC_LdStLFD>;
     defm PSTD :
-      8LS_DForm_R_D34_RTA5_p<61, (outs), (ins g8rc:$RS, memri34:$D_RA),
-                             (ins g8rc:$RS, memri34_pcrel:$D_RA),
-                             "pstd $RS, $D_RA", IIC_LdStLFD>;
+      8LS_DForm_R_SI34_RTA5_p<61, (outs), (ins g8rc:$RS, memri34:$D_RA),
+                              (ins g8rc:$RS, memri34_pcrel:$D_RA),
+                              "pstd $RS, $D_RA", IIC_LdStLFD>;
   }
 }