diff --git a/llvm/lib/Transforms/Scalar/SROA.cpp b/llvm/lib/Transforms/Scalar/SROA.cpp
index 33f90d0b01e45b4bf7c57225b7b104ae42b9c59e..bd4c21d65abca522c1789863556dfde7648dad53 100644
--- a/llvm/lib/Transforms/Scalar/SROA.cpp
+++ b/llvm/lib/Transforms/Scalar/SROA.cpp
@@ -1888,6 +1888,14 @@ static VectorType *isVectorPromotionViable(Partition &P, const DataLayout &DL) {
   bool HaveCommonEltTy = true;
   auto CheckCandidateType = [&](Type *Ty) {
     if (auto *VTy = dyn_cast<VectorType>(Ty)) {
+      // Return if bitcast to vectors is different for total size in bits.
+      if (!CandidateTys.empty()) {
+        VectorType *V = CandidateTys[0];
+        if (DL.getTypeSizeInBits(VTy) != DL.getTypeSizeInBits(V)) {
+          CandidateTys.clear();
+          return;
+        }
+      }
       CandidateTys.push_back(VTy);
       if (!CommonEltTy)
         CommonEltTy = VTy->getElementType();
diff --git a/llvm/test/Transforms/SROA/vector-promotion-different-size.ll b/llvm/test/Transforms/SROA/vector-promotion-different-size.ll
new file mode 100644
index 0000000000000000000000000000000000000000..56e1f1f2160a7ba913b47e9e34e30f239bc5b450
--- /dev/null
+++ b/llvm/test/Transforms/SROA/vector-promotion-different-size.ll
@@ -0,0 +1,24 @@
+; RUN: opt < %s -sroa -S | FileCheck %s
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-n8:16:32:64"
+
+define <4 x i1> @vector_bitcast() {
+  ; CHECK-LABEL: @vector_bitcast
+  ; CHECK: alloca i1
+
+    %a = alloca <3 x i1>
+    store <3 x i1> <i1 1,i1 0,i1 1>, <3 x i1>* %a
+    %cast = bitcast <3 x i1>* %a to <4 x i1>*
+    %vec = load <4 x i1>, <4 x i1>* %cast
+    ret <4 x i1> %vec
+}
+
+define void @vector_bitcast_2() {
+  ; CHECK-LABEL: @vector_bitcast_2
+  ; CHECK: alloca <32 x i16>
+
+    %"sum$1.host2" = alloca <32 x i16>
+    store <32 x i16> undef, <32 x i16>* %"sum$1.host2"
+    %bc = bitcast <32 x i16>* %"sum$1.host2" to <64 x i16>*
+    %bcl = load <64 x i16>, <64 x i16>* %bc
+    ret void
+}