diff --git a/llvm/lib/Target/AArch64/AArch64InstrInfo.td b/llvm/lib/Target/AArch64/AArch64InstrInfo.td
--- a/llvm/lib/Target/AArch64/AArch64InstrInfo.td
+++ b/llvm/lib/Target/AArch64/AArch64InstrInfo.td
@@ -140,6 +140,12 @@
     : Predicate<"Subtarget->hasSVE2() || Subtarget->hasStreamingSVE()">,
                 AssemblerPredicate<(any_of FeatureSVE2, FeatureStreamingSVE),
                 "streaming-sve or sve2">;
+// A subset of NEON instructions are legal in Streaming SVE execution mode,
+// they should be enabled if either has been specified.
+def HasNEONorStreamingSVE
+    : Predicate<"Subtarget->hasNEON() || Subtarget->hasStreamingSVE()">,
+                AssemblerPredicate<(any_of FeatureNEON, FeatureStreamingSVE),
+                "streaming-sve or neon">;
 def HasRCPC          : Predicate<"Subtarget->hasRCPC()">,
                                  AssemblerPredicate<(all_of FeatureRCPC), "rcpc">;
 def HasAltNZCV       : Predicate<"Subtarget->hasAlternativeNZCV()">,