diff --git a/llvm/lib/Target/AMDGPU/AMDGPUInstCombineIntrinsic.cpp b/llvm/lib/Target/AMDGPU/AMDGPUInstCombineIntrinsic.cpp
--- a/llvm/lib/Target/AMDGPU/AMDGPUInstCombineIntrinsic.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUInstCombineIntrinsic.cpp
@@ -728,7 +728,7 @@
                                                     APInt DemandedElts,
                                                     int DMaskIdx = -1) {
 
-  auto *IIVTy = cast<VectorType>(II.getType());
+  auto *IIVTy = cast<FixedVectorType>(II.getType());
   unsigned VWidth = IIVTy->getNumElements();
   if (VWidth == 1)
     return nullptr;