diff --git a/llvm/lib/Target/PowerPC/PPC.td b/llvm/lib/Target/PowerPC/PPC.td
--- a/llvm/lib/Target/PowerPC/PPC.td
+++ b/llvm/lib/Target/PowerPC/PPC.td
@@ -236,7 +236,7 @@
 def FeaturePCRelativeMemops :
   SubtargetFeature<"pcrelative-memops", "HasPCRelativeMemops", "true",
                    "Enable PC relative Memory Ops",
-                   [FeatureISA3_0]>;
+                   [FeatureISA3_0, FeaturePrefixInstrs]>;
 def FeaturePairedVectorMemops:
   SubtargetFeature<"paired-vector-memops", "PairedVectorMemops", "true",
                    "32Byte load and store instructions",
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
@@ -1398,12 +1398,6 @@
   def LXVPX : XForm_XTp5_XAB5<31, 333, (outs vsrprc:$XTp), (ins memrr:$src),
                               "lxvpx $XTp, $src", IIC_LdStLFD,
                               []>;
-  let Predicates = [PrefixInstrs] in {
-    defm PLXVP :
-      8LS_DForm_R_XTp5_SI34_MEM_p<1, 58, (outs vsrprc:$XTp), (ins memri34:$D_RA),
-                                  (ins memri34_pcrel:$D_RA), "plxvp $XTp, $D_RA",
-                                  IIC_LdStLFD>;
-  }
 }
 
 let mayLoad = 0, mayStore = 1, Predicates = [PairedVectorMemops] in {
@@ -1413,12 +1407,20 @@
   def STXVPX : XForm_XTp5_XAB5<31, 461, (outs), (ins vsrprc:$XTp, memrr:$dst),
                                "stxvpx $XTp, $dst", IIC_LdStLFD,
                                []>;
-  let Predicates = [PrefixInstrs] in {
-    defm PSTXVP :
-      8LS_DForm_R_XTp5_SI34_MEM_p<1, 62, (outs), (ins vsrprc:$XTp, memri34:$D_RA),
-                                  (ins vsrprc:$XTp, memri34_pcrel:$D_RA),
-                                  "pstxvp $XTp, $D_RA", IIC_LdStLFD>;
-  }
+}
+
+let mayLoad = 1, mayStore = 0, hasSideEffects = 0, Predicates = [PairedVectorMemops, PrefixInstrs] in {
+  defm PLXVP :
+    8LS_DForm_R_XTp5_SI34_MEM_p<1, 58, (outs vsrprc:$XTp), (ins memri34:$D_RA),
+                                (ins memri34_pcrel:$D_RA), "plxvp $XTp, $D_RA",
+                                IIC_LdStLFD>;
+}
+
+let mayLoad = 0, mayStore = 1, hasSideEffects = 0, Predicates = [PairedVectorMemops, PrefixInstrs] in {
+  defm PSTXVP :
+    8LS_DForm_R_XTp5_SI34_MEM_p<1, 62, (outs), (ins vsrprc:$XTp, memri34:$D_RA),
+                                (ins vsrprc:$XTp, memri34_pcrel:$D_RA),
+                                "pstxvp $XTp, $D_RA", IIC_LdStLFD>;
 }
 
 // TODO: We have an added complexity of 500 here. This is only a temporary