diff --git a/llvm/lib/Target/AArch64/AArch64Subtarget.h b/llvm/lib/Target/AArch64/AArch64Subtarget.h
--- a/llvm/lib/Target/AArch64/AArch64Subtarget.h
+++ b/llvm/lib/Target/AArch64/AArch64Subtarget.h
@@ -680,7 +680,10 @@
     return MinSVEVectorSizeInBits;
   }
 
-  bool useSVEForFixedLengthVectors() const;
+  bool useSVEForFixedLengthVectors() const {
+    // Prefer NEON unless larger SVE registers are available.
+    return hasSVE() && getMinSVEVectorSizeInBits() >= 256;
+  }
 
   unsigned getVScaleForTuning() const { return VScaleForTuning; }
 };
diff --git a/llvm/lib/Target/AArch64/AArch64Subtarget.cpp b/llvm/lib/Target/AArch64/AArch64Subtarget.cpp
--- a/llvm/lib/Target/AArch64/AArch64Subtarget.cpp
+++ b/llvm/lib/Target/AArch64/AArch64Subtarget.cpp
@@ -373,9 +373,4 @@
     MFI.computeMaxCallFrameSize(MF);
 }
 
-bool AArch64Subtarget::useSVEForFixedLengthVectors() const {
-  // Prefer NEON unless larger SVE registers are available.
-  return hasSVE() && getMinSVEVectorSizeInBits() >= 256;
-}
-
 bool AArch64Subtarget::useAA() const { return UseAA; }