diff --git a/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp b/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
index 60d0cc3f98730..fdf973d0cf1b7 100644
--- a/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
+++ b/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
@@ -6134,8 +6134,13 @@ AArch64TTIImpl::getShuffleCost(TTI::ShuffleKind Kind, VectorType *DstTy,
   unsigned Unused;
   if (LT.second.isFixedLengthVector() &&
       LT.second.getVectorNumElements() == Mask.size() &&
-      (Kind == TTI::SK_PermuteTwoSrc || Kind == TTI::SK_PermuteSingleSrc) &&
+      (Kind == TTI::SK_PermuteTwoSrc || Kind == TTI::SK_PermuteSingleSrc ||
+       // Discrepancies between isTRNMask and ShuffleVectorInst::isTransposeMask
+       // mean that we can end up with shuffles that satisfy isTRNMask, but end
+       // up labelled as TTI::SK_InsertSubvector. (e.g. {2, 0}).
+       Kind == TTI::SK_InsertSubvector) &&
       (isZIPMask(Mask, LT.second.getVectorNumElements(), Unused, Unused) ||
+       isTRNMask(Mask, LT.second.getVectorNumElements(), Unused, Unused) ||
        isUZPMask(Mask, LT.second.getVectorNumElements(), Unused) ||
        isREVMask(Mask, LT.second.getScalarSizeInBits(),
                  LT.second.getVectorNumElements(), 16) ||
diff --git a/llvm/test/Analysis/CostModel/AArch64/shuffle-transpose.ll b/llvm/test/Analysis/CostModel/AArch64/shuffle-transpose.ll
index 4c4843088551a..402313d00de36 100644
--- a/llvm/test/Analysis/CostModel/AArch64/shuffle-transpose.ll
+++ b/llvm/test/Analysis/CostModel/AArch64/shuffle-transpose.ll
@@ -12,6 +12,15 @@ define <8 x i8> @trn1.v8i8(<8 x i8> %v0, <8 x i8> %v1) {
   ret <8 x i8> %tmp0
 }
 
+define <8 x i8> @trn1.v8i8_flipped(<8 x i8> %v0, <8 x i8> %v1) {
+; CHECK-LABEL: 'trn1.v8i8_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <8 x i8> %v0, <8 x i8> %v1, <8 x i32> <i32 8, i32 0, i32 10, i32 2, i32 12, i32 4, i32 14, i32 6>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <8 x i8> %tmp0
+;
+  %tmp0 = shufflevector <8 x i8> %v0, <8 x i8> %v1, <8 x i32> <i32 8, i32 0, i32 10, i32 2, i32 12, i32 4, i32 14, i32 6>
+  ret <8 x i8> %tmp0
+}
+
 define <8 x i8> @trn2.v8i8(<8 x i8> %v0, <8 x i8> %v1) {
 ; CHECK-LABEL: 'trn2.v8i8'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <8 x i8> %v0, <8 x i8> %v1, <8 x i32> <i32 1, i32 9, i32 3, i32 11, i32 5, i32 13, i32 7, i32 15>
@@ -21,6 +30,15 @@ define <8 x i8> @trn2.v8i8(<8 x i8> %v0, <8 x i8> %v1) {
   ret <8 x i8> %tmp0
 }
 
+define <8 x i8> @trn2.v8i8_flipped(<8 x i8> %v0, <8 x i8> %v1) {
+; CHECK-LABEL: 'trn2.v8i8_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <8 x i8> %v0, <8 x i8> %v1, <8 x i32> <i32 9, i32 1, i32 11, i32 3, i32 13, i32 5, i32 15, i32 7>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <8 x i8> %tmp0
+;
+  %tmp0 = shufflevector <8 x i8> %v0, <8 x i8> %v1, <8 x i32> <i32 9, i32 1, i32 11, i32 3, i32 13, i32 5, i32 15, i32 7>
+  ret <8 x i8> %tmp0
+}
+
 define <16 x i8> @trn1.v16i8(<16 x i8> %v0, <16 x i8> %v1) {
 ; CHECK-LABEL: 'trn1.v16i8'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <16 x i8> %v0, <16 x i8> %v1, <16 x i32> <i32 0, i32 16, i32 2, i32 18, i32 4, i32 20, i32 6, i32 22, i32 8, i32 24, i32 10, i32 26, i32 12, i32 28, i32 14, i32 30>
@@ -30,6 +48,15 @@ define <16 x i8> @trn1.v16i8(<16 x i8> %v0, <16 x i8> %v1) {
   ret <16 x i8> %tmp0
 }
 
+define <16 x i8> @trn1.v16i8_flipped(<16 x i8> %v0, <16 x i8> %v1) {
+; CHECK-LABEL: 'trn1.v16i8_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <16 x i8> %v0, <16 x i8> %v1, <16 x i32> <i32 16, i32 0, i32 18, i32 2, i32 20, i32 4, i32 22, i32 6, i32 24, i32 8, i32 26, i32 10, i32 28, i32 12, i32 30, i32 14>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <16 x i8> %tmp0
+;
+  %tmp0 = shufflevector <16 x i8> %v0, <16 x i8> %v1, <16 x i32> <i32 16, i32 0, i32 18, i32 2, i32 20, i32 4, i32 22, i32 6, i32 24, i32 8, i32 26, i32 10, i32 28, i32 12, i32 30, i32 14>
+  ret <16 x i8> %tmp0
+}
+
 define <16 x i8> @trn2.v16i8(<16 x i8> %v0, <16 x i8> %v1) {
 ; CHECK-LABEL: 'trn2.v16i8'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <16 x i8> %v0, <16 x i8> %v1, <16 x i32> <i32 1, i32 17, i32 3, i32 19, i32 5, i32 21, i32 7, i32 23, i32 9, i32 25, i32 11, i32 27, i32 13, i32 29, i32 15, i32 31>
@@ -39,6 +66,15 @@ define <16 x i8> @trn2.v16i8(<16 x i8> %v0, <16 x i8> %v1) {
   ret <16 x i8> %tmp0
 }
 
+define <16 x i8> @trn2.v16i8_flipped(<16 x i8> %v0, <16 x i8> %v1) {
+; CHECK-LABEL: 'trn2.v16i8_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <16 x i8> %v0, <16 x i8> %v1, <16 x i32> <i32 17, i32 1, i32 19, i32 3, i32 21, i32 5, i32 23, i32 7, i32 25, i32 9, i32 27, i32 11, i32 29, i32 13, i32 31, i32 15>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <16 x i8> %tmp0
+;
+  %tmp0 = shufflevector <16 x i8> %v0, <16 x i8> %v1, <16 x i32> <i32 17, i32 1, i32 19, i32 3, i32 21, i32 5, i32 23, i32 7, i32 25, i32 9, i32 27, i32 11, i32 29, i32 13, i32 31, i32 15>
+  ret <16 x i8> %tmp0
+}
+
 define <4 x i16> @trn1.v4i16(<4 x i16> %v0, <4 x i16> %v1) {
 ; CHECK-LABEL: 'trn1.v4i16'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <4 x i16> %v0, <4 x i16> %v1, <4 x i32> <i32 0, i32 4, i32 2, i32 6>
@@ -48,6 +84,15 @@ define <4 x i16> @trn1.v4i16(<4 x i16> %v0, <4 x i16> %v1) {
   ret <4 x i16> %tmp0
 }
 
+define <4 x i16> @trn1.v4i16_flipped(<4 x i16> %v0, <4 x i16> %v1) {
+; CHECK-LABEL: 'trn1.v4i16_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <4 x i16> %v0, <4 x i16> %v1, <4 x i32> <i32 4, i32 0, i32 6, i32 2>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <4 x i16> %tmp0
+;
+  %tmp0 = shufflevector <4 x i16> %v0, <4 x i16> %v1, <4 x i32> <i32 4, i32 0, i32 6, i32 2>
+  ret <4 x i16> %tmp0
+}
+
 define <4 x i16> @trn2.v4i16(<4 x i16> %v0, <4 x i16> %v1) {
 ; CHECK-LABEL: 'trn2.v4i16'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <4 x i16> %v0, <4 x i16> %v1, <4 x i32> <i32 1, i32 5, i32 3, i32 7>
@@ -57,6 +102,15 @@ define <4 x i16> @trn2.v4i16(<4 x i16> %v0, <4 x i16> %v1) {
   ret <4 x i16> %tmp0
 }
 
+define <4 x i16> @trn2.v4i16_flipped(<4 x i16> %v0, <4 x i16> %v1) {
+; CHECK-LABEL: 'trn2.v4i16_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <4 x i16> %v0, <4 x i16> %v1, <4 x i32> <i32 5, i32 1, i32 7, i32 3>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <4 x i16> %tmp0
+;
+  %tmp0 = shufflevector <4 x i16> %v0, <4 x i16> %v1, <4 x i32> <i32 5, i32 1, i32 7, i32 3>
+  ret <4 x i16> %tmp0
+}
+
 define <8 x i16> @trn1.v8i16(<8 x i16> %v0, <8 x i16> %v1) {
 ; CHECK-LABEL: 'trn1.v8i16'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <8 x i16> %v0, <8 x i16> %v1, <8 x i32> <i32 0, i32 8, i32 2, i32 10, i32 4, i32 12, i32 6, i32 14>
@@ -66,6 +120,15 @@ define <8 x i16> @trn1.v8i16(<8 x i16> %v0, <8 x i16> %v1) {
   ret <8 x i16> %tmp0
 }
 
+define <8 x i16> @trn1.v8i16_flipped(<8 x i16> %v0, <8 x i16> %v1) {
+; CHECK-LABEL: 'trn1.v8i16_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <8 x i16> %v0, <8 x i16> %v1, <8 x i32> <i32 8, i32 0, i32 10, i32 2, i32 12, i32 4, i32 14, i32 6>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <8 x i16> %tmp0
+;
+  %tmp0 = shufflevector <8 x i16> %v0, <8 x i16> %v1, <8 x i32> <i32 8, i32 0, i32 10, i32 2, i32 12, i32 4, i32 14, i32 6>
+  ret <8 x i16> %tmp0
+}
+
 define <8 x i16> @trn2.v8i16(<8 x i16> %v0, <8 x i16> %v1) {
 ; CHECK-LABEL: 'trn2.v8i16'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <8 x i16> %v0, <8 x i16> %v1, <8 x i32> <i32 1, i32 9, i32 3, i32 11, i32 5, i32 13, i32 7, i32 15>
@@ -75,6 +138,15 @@ define <8 x i16> @trn2.v8i16(<8 x i16> %v0, <8 x i16> %v1) {
   ret <8 x i16> %tmp0
 }
 
+define <8 x i16> @trn2.v8i16_flipped(<8 x i16> %v0, <8 x i16> %v1) {
+; CHECK-LABEL: 'trn2.v8i16_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <8 x i16> %v0, <8 x i16> %v1, <8 x i32> <i32 9, i32 1, i32 11, i32 3, i32 13, i32 5, i32 15, i32 7>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <8 x i16> %tmp0
+;
+  %tmp0 = shufflevector <8 x i16> %v0, <8 x i16> %v1, <8 x i32> <i32 9, i32 1, i32 11, i32 3, i32 13, i32 5, i32 15, i32 7>
+  ret <8 x i16> %tmp0
+}
+
 define <2 x i32> @trn1.v2i32(<2 x i32> %v0, <2 x i32> %v1) {
 ; CHECK-LABEL: 'trn1.v2i32'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <2 x i32> %v0, <2 x i32> %v1, <2 x i32> <i32 0, i32 2>
@@ -84,6 +156,15 @@ define <2 x i32> @trn1.v2i32(<2 x i32> %v0, <2 x i32> %v1) {
   ret <2 x i32> %tmp0
 }
 
+define <2 x i32> @trn1.v2i32_flipped(<2 x i32> %v0, <2 x i32> %v1) {
+; CHECK-LABEL: 'trn1.v2i32_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <2 x i32> %v0, <2 x i32> %v1, <2 x i32> <i32 2, i32 0>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <2 x i32> %tmp0
+;
+  %tmp0 = shufflevector <2 x i32> %v0, <2 x i32> %v1, <2 x i32> <i32 2, i32 0>
+  ret <2 x i32> %tmp0
+}
+
 define <2 x i32> @trn2.v2i32(<2 x i32> %v0, <2 x i32> %v1) {
 ; CHECK-LABEL: 'trn2.v2i32'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <2 x i32> %v0, <2 x i32> %v1, <2 x i32> <i32 1, i32 3>
@@ -93,6 +174,15 @@ define <2 x i32> @trn2.v2i32(<2 x i32> %v0, <2 x i32> %v1) {
   ret <2 x i32> %tmp0
 }
 
+define <2 x i32> @trn2.v2i32_flipped(<2 x i32> %v0, <2 x i32> %v1) {
+; CHECK-LABEL: 'trn2.v2i32_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <2 x i32> %v0, <2 x i32> %v1, <2 x i32> <i32 3, i32 1>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <2 x i32> %tmp0
+;
+  %tmp0 = shufflevector <2 x i32> %v0, <2 x i32> %v1, <2 x i32> <i32 3, i32 1>
+  ret <2 x i32> %tmp0
+}
+
 define <4 x i32> @trn1.v4i32(<4 x i32> %v0, <4 x i32> %v1) {
 ; CHECK-LABEL: 'trn1.v4i32'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <4 x i32> %v0, <4 x i32> %v1, <4 x i32> <i32 0, i32 4, i32 2, i32 6>
@@ -102,6 +192,15 @@ define <4 x i32> @trn1.v4i32(<4 x i32> %v0, <4 x i32> %v1) {
   ret <4 x i32> %tmp0
 }
 
+define <4 x i32> @trn1.v4i32_flipped(<4 x i32> %v0, <4 x i32> %v1) {
+; CHECK-LABEL: 'trn1.v4i32_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <4 x i32> %v0, <4 x i32> %v1, <4 x i32> <i32 4, i32 0, i32 6, i32 2>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <4 x i32> %tmp0
+;
+  %tmp0 = shufflevector <4 x i32> %v0, <4 x i32> %v1, <4 x i32> <i32 4, i32 0, i32 6, i32 2>
+  ret <4 x i32> %tmp0
+}
+
 define <4 x i32> @trn2.v4i32(<4 x i32> %v0, <4 x i32> %v1) {
 ; CHECK-LABEL: 'trn2.v4i32'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <4 x i32> %v0, <4 x i32> %v1, <4 x i32> <i32 1, i32 5, i32 3, i32 7>
@@ -111,6 +210,15 @@ define <4 x i32> @trn2.v4i32(<4 x i32> %v0, <4 x i32> %v1) {
   ret <4 x i32> %tmp0
 }
 
+define <4 x i32> @trn2.v4i32_flipped(<4 x i32> %v0, <4 x i32> %v1) {
+; CHECK-LABEL: 'trn2.v4i32_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <4 x i32> %v0, <4 x i32> %v1, <4 x i32> <i32 5, i32 1, i32 7, i32 3>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <4 x i32> %tmp0
+;
+  %tmp0 = shufflevector <4 x i32> %v0, <4 x i32> %v1, <4 x i32> <i32 5, i32 1, i32 7, i32 3>
+  ret <4 x i32> %tmp0
+}
+
 define <2 x i64> @trn1.v2i64(<2 x i64> %v0, <2 x i64> %v1) {
 ; CHECK-LABEL: 'trn1.v2i64'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <2 x i64> %v0, <2 x i64> %v1, <2 x i32> <i32 0, i32 2>
@@ -120,6 +228,15 @@ define <2 x i64> @trn1.v2i64(<2 x i64> %v0, <2 x i64> %v1) {
   ret <2 x i64> %tmp0
 }
 
+define <2 x i64> @trn1.v2i64_flipped(<2 x i64> %v0, <2 x i64> %v1) {
+; CHECK-LABEL: 'trn1.v2i64_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <2 x i64> %v0, <2 x i64> %v1, <2 x i32> <i32 2, i32 0>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <2 x i64> %tmp0
+;
+  %tmp0 = shufflevector <2 x i64> %v0, <2 x i64> %v1, <2 x i32> <i32 2, i32 0>
+  ret <2 x i64> %tmp0
+}
+
 define <2 x i64> @trn2.v2i64(<2 x i64> %v0, <2 x i64> %v1) {
 ; CHECK-LABEL: 'trn2.v2i64'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <2 x i64> %v0, <2 x i64> %v1, <2 x i32> <i32 1, i32 3>
@@ -129,6 +246,15 @@ define <2 x i64> @trn2.v2i64(<2 x i64> %v0, <2 x i64> %v1) {
   ret <2 x i64> %tmp0
 }
 
+define <2 x i64> @trn2.v2i64_flipped(<2 x i64> %v0, <2 x i64> %v1) {
+; CHECK-LABEL: 'trn2.v2i64_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <2 x i64> %v0, <2 x i64> %v1, <2 x i32> <i32 3, i32 1>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <2 x i64> %tmp0
+;
+  %tmp0 = shufflevector <2 x i64> %v0, <2 x i64> %v1, <2 x i32> <i32 3, i32 1>
+  ret <2 x i64> %tmp0
+}
+
 define <2 x float> @trn1.v2f32(<2 x float> %v0, <2 x float> %v1) {
 ; CHECK-LABEL: 'trn1.v2f32'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <2 x float> %v0, <2 x float> %v1, <2 x i32> <i32 0, i32 2>
@@ -138,6 +264,15 @@ define <2 x float> @trn1.v2f32(<2 x float> %v0, <2 x float> %v1) {
   ret <2 x float> %tmp0
 }
 
+define <2 x float> @trn1.v2f32_flipped(<2 x float> %v0, <2 x float> %v1) {
+; CHECK-LABEL: 'trn1.v2f32_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <2 x float> %v0, <2 x float> %v1, <2 x i32> <i32 2, i32 0>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <2 x float> %tmp0
+;
+  %tmp0 = shufflevector <2 x float> %v0, <2 x float> %v1, <2 x i32> <i32 2, i32 0>
+  ret <2 x float> %tmp0
+}
+
 define <2 x float> @trn2.v2f32(<2 x float> %v0, <2 x float> %v1) {
 ; CHECK-LABEL: 'trn2.v2f32'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <2 x float> %v0, <2 x float> %v1, <2 x i32> <i32 1, i32 3>
@@ -147,6 +282,15 @@ define <2 x float> @trn2.v2f32(<2 x float> %v0, <2 x float> %v1) {
   ret <2 x float> %tmp0
 }
 
+define <2 x float> @trn2.v2f32_flipped(<2 x float> %v0, <2 x float> %v1) {
+; CHECK-LABEL: 'trn2.v2f32_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <2 x float> %v0, <2 x float> %v1, <2 x i32> <i32 3, i32 1>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <2 x float> %tmp0
+;
+  %tmp0 = shufflevector <2 x float> %v0, <2 x float> %v1, <2 x i32> <i32 3, i32 1>
+  ret <2 x float> %tmp0
+}
+
 define <4 x float> @trn1.v4f32(<4 x float> %v0, <4 x float> %v1) {
 ; CHECK-LABEL: 'trn1.v4f32'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <4 x float> %v0, <4 x float> %v1, <4 x i32> <i32 0, i32 4, i32 2, i32 6>
@@ -156,6 +300,15 @@ define <4 x float> @trn1.v4f32(<4 x float> %v0, <4 x float> %v1) {
   ret <4 x float> %tmp0
 }
 
+define <4 x float> @trn1.v4f32_flipped(<4 x float> %v0, <4 x float> %v1) {
+; CHECK-LABEL: 'trn1.v4f32_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <4 x float> %v0, <4 x float> %v1, <4 x i32> <i32 4, i32 0, i32 6, i32 2>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <4 x float> %tmp0
+;
+  %tmp0 = shufflevector <4 x float> %v0, <4 x float> %v1, <4 x i32> <i32 4, i32 0, i32 6, i32 2>
+  ret <4 x float> %tmp0
+}
+
 define <4 x float> @trn2.v4f32(<4 x float> %v0, <4 x float> %v1) {
 ; CHECK-LABEL: 'trn2.v4f32'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <4 x float> %v0, <4 x float> %v1, <4 x i32> <i32 1, i32 5, i32 3, i32 7>
@@ -165,6 +318,15 @@ define <4 x float> @trn2.v4f32(<4 x float> %v0, <4 x float> %v1) {
   ret <4 x float> %tmp0
 }
 
+define <4 x float> @trn2.v4f32_flipped(<4 x float> %v0, <4 x float> %v1) {
+; CHECK-LABEL: 'trn2.v4f32_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <4 x float> %v0, <4 x float> %v1, <4 x i32> <i32 5, i32 1, i32 7, i32 3>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <4 x float> %tmp0
+;
+  %tmp0 = shufflevector <4 x float> %v0, <4 x float> %v1, <4 x i32> <i32 5, i32 1, i32 7, i32 3>
+  ret <4 x float> %tmp0
+}
+
 define <2 x double> @trn1.v2f64(<2 x double> %v0, <2 x double> %v1) {
 ; CHECK-LABEL: 'trn1.v2f64'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <2 x double> %v0, <2 x double> %v1, <2 x i32> <i32 0, i32 2>
@@ -174,6 +336,15 @@ define <2 x double> @trn1.v2f64(<2 x double> %v0, <2 x double> %v1) {
   ret <2 x double> %tmp0
 }
 
+define <2 x double> @trn1.v2f64_flipped(<2 x double> %v0, <2 x double> %v1) {
+; CHECK-LABEL: 'trn1.v2f64_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <2 x double> %v0, <2 x double> %v1, <2 x i32> <i32 2, i32 0>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <2 x double> %tmp0
+;
+  %tmp0 = shufflevector <2 x double> %v0, <2 x double> %v1, <2 x i32> <i32 2, i32 0>
+  ret <2 x double> %tmp0
+}
+
 define <2 x double> @trn2.v2f64(<2 x double> %v0, <2 x double> %v1) {
 ; CHECK-LABEL: 'trn2.v2f64'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <2 x double> %v0, <2 x double> %v1, <2 x i32> <i32 1, i32 3>
@@ -183,6 +354,15 @@ define <2 x double> @trn2.v2f64(<2 x double> %v0, <2 x double> %v1) {
   ret <2 x double> %tmp0
 }
 
+define <2 x double> @trn2.v2f64_flipped(<2 x double> %v0, <2 x double> %v1) {
+; CHECK-LABEL: 'trn2.v2f64_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <2 x double> %v0, <2 x double> %v1, <2 x i32> <i32 3, i32 1>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <2 x double> %tmp0
+;
+  %tmp0 = shufflevector <2 x double> %v0, <2 x double> %v1, <2 x i32> <i32 3, i32 1>
+  ret <2 x double> %tmp0
+}
+
 define <4 x half> @trn1.v4f16(<4 x half> %v0, <4 x half> %v1) {
 ; CHECK-LABEL: 'trn1.v4f16'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <4 x half> %v0, <4 x half> %v1, <4 x i32> <i32 0, i32 4, i32 2, i32 6>
@@ -192,6 +372,15 @@ define <4 x half> @trn1.v4f16(<4 x half> %v0, <4 x half> %v1) {
   ret <4 x half> %tmp0
 }
 
+define <4 x half> @trn1.v4f16_flipped(<4 x half> %v0, <4 x half> %v1) {
+; CHECK-LABEL: 'trn1.v4f16_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <4 x half> %v0, <4 x half> %v1, <4 x i32> <i32 4, i32 0, i32 6, i32 2>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <4 x half> %tmp0
+;
+  %tmp0 = shufflevector <4 x half> %v0, <4 x half> %v1, <4 x i32> <i32 4, i32 0, i32 6, i32 2>
+  ret <4 x half> %tmp0
+}
+
 define <4 x half> @trn2.v4f16(<4 x half> %v0, <4 x half> %v1) {
 ; CHECK-LABEL: 'trn2.v4f16'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <4 x half> %v0, <4 x half> %v1, <4 x i32> <i32 1, i32 5, i32 3, i32 7>
@@ -201,6 +390,15 @@ define <4 x half> @trn2.v4f16(<4 x half> %v0, <4 x half> %v1) {
   ret <4 x half> %tmp0
 }
 
+define <4 x half> @trn2.v4f16_flipped(<4 x half> %v0, <4 x half> %v1) {
+; CHECK-LABEL: 'trn2.v4f16_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <4 x half> %v0, <4 x half> %v1, <4 x i32> <i32 5, i32 1, i32 7, i32 3>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <4 x half> %tmp0
+;
+  %tmp0 = shufflevector <4 x half> %v0, <4 x half> %v1, <4 x i32> <i32 5, i32 1, i32 7, i32 3>
+  ret <4 x half> %tmp0
+}
+
 define <8 x half> @trn1.v8f16(<8 x half> %v0, <8 x half> %v1) {
 ; CHECK-LABEL: 'trn1.v8f16'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <8 x half> %v0, <8 x half> %v1, <8 x i32> <i32 0, i32 8, i32 2, i32 10, i32 4, i32 12, i32 6, i32 14>
@@ -210,6 +408,15 @@ define <8 x half> @trn1.v8f16(<8 x half> %v0, <8 x half> %v1) {
   ret <8 x half> %tmp0
 }
 
+define <8 x half> @trn1.v8f16_flipped(<8 x half> %v0, <8 x half> %v1) {
+; CHECK-LABEL: 'trn1.v8f16_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <8 x half> %v0, <8 x half> %v1, <8 x i32> <i32 8, i32 0, i32 10, i32 2, i32 12, i32 4, i32 14, i32 6>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <8 x half> %tmp0
+;
+  %tmp0 = shufflevector <8 x half> %v0, <8 x half> %v1, <8 x i32> <i32 8, i32 0, i32 10, i32 2, i32 12, i32 4, i32 14, i32 6>
+  ret <8 x half> %tmp0
+}
+
 define <8 x half> @trn2.v8f16(<8 x half> %v0, <8 x half> %v1) {
 ; CHECK-LABEL: 'trn2.v8f16'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <8 x half> %v0, <8 x half> %v1, <8 x i32> <i32 1, i32 9, i32 3, i32 11, i32 5, i32 13, i32 7, i32 15>
@@ -219,6 +426,15 @@ define <8 x half> @trn2.v8f16(<8 x half> %v0, <8 x half> %v1) {
   ret <8 x half> %tmp0
 }
 
+define <8 x half> @trn2.v8f16_flipped(<8 x half> %v0, <8 x half> %v1) {
+; CHECK-LABEL: 'trn2.v8f16_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <8 x half> %v0, <8 x half> %v1, <8 x i32> <i32 9, i32 1, i32 11, i32 3, i32 13, i32 5, i32 15, i32 7>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <8 x half> %tmp0
+;
+  %tmp0 = shufflevector <8 x half> %v0, <8 x half> %v1, <8 x i32> <i32 9, i32 1, i32 11, i32 3, i32 13, i32 5, i32 15, i32 7>
+  ret <8 x half> %tmp0
+}
+
 define <4 x bfloat> @trn1.v4bf16(<4 x bfloat> %v0, <4 x bfloat> %v1) {
 ; CHECK-LABEL: 'trn1.v4bf16'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <4 x bfloat> %v0, <4 x bfloat> %v1, <4 x i32> <i32 0, i32 4, i32 2, i32 6>
@@ -228,6 +444,15 @@ define <4 x bfloat> @trn1.v4bf16(<4 x bfloat> %v0, <4 x bfloat> %v1) {
   ret <4 x bfloat> %tmp0
 }
 
+define <4 x bfloat> @trn1.v4bf16_flipped(<4 x bfloat> %v0, <4 x bfloat> %v1) {
+; CHECK-LABEL: 'trn1.v4bf16_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <4 x bfloat> %v0, <4 x bfloat> %v1, <4 x i32> <i32 4, i32 0, i32 6, i32 2>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <4 x bfloat> %tmp0
+;
+  %tmp0 = shufflevector <4 x bfloat> %v0, <4 x bfloat> %v1, <4 x i32> <i32 4, i32 0, i32 6, i32 2>
+  ret <4 x bfloat> %tmp0
+}
+
 define <4 x bfloat> @trn2.v4bf16(<4 x bfloat> %v0, <4 x bfloat> %v1) {
 ; CHECK-LABEL: 'trn2.v4bf16'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <4 x bfloat> %v0, <4 x bfloat> %v1, <4 x i32> <i32 1, i32 5, i32 3, i32 7>
@@ -237,6 +462,15 @@ define <4 x bfloat> @trn2.v4bf16(<4 x bfloat> %v0, <4 x bfloat> %v1) {
   ret <4 x bfloat> %tmp0
 }
 
+define <4 x bfloat> @trn2.v4bf16_flipped(<4 x bfloat> %v0, <4 x bfloat> %v1) {
+; CHECK-LABEL: 'trn2.v4bf16_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <4 x bfloat> %v0, <4 x bfloat> %v1, <4 x i32> <i32 5, i32 1, i32 7, i32 3>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <4 x bfloat> %tmp0
+;
+  %tmp0 = shufflevector <4 x bfloat> %v0, <4 x bfloat> %v1, <4 x i32> <i32 5, i32 1, i32 7, i32 3>
+  ret <4 x bfloat> %tmp0
+}
+
 define <8 x bfloat> @trn1.v8bf16(<8 x bfloat> %v0, <8 x bfloat> %v1) {
 ; CHECK-LABEL: 'trn1.v8bf16'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <8 x bfloat> %v0, <8 x bfloat> %v1, <8 x i32> <i32 0, i32 8, i32 2, i32 10, i32 4, i32 12, i32 6, i32 14>
@@ -246,6 +480,15 @@ define <8 x bfloat> @trn1.v8bf16(<8 x bfloat> %v0, <8 x bfloat> %v1) {
   ret <8 x bfloat> %tmp0
 }
 
+define <8 x bfloat> @trn1.v8bf16_flipped(<8 x bfloat> %v0, <8 x bfloat> %v1) {
+; CHECK-LABEL: 'trn1.v8bf16_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <8 x bfloat> %v0, <8 x bfloat> %v1, <8 x i32> <i32 8, i32 0, i32 10, i32 2, i32 12, i32 4, i32 14, i32 6>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <8 x bfloat> %tmp0
+;
+  %tmp0 = shufflevector <8 x bfloat> %v0, <8 x bfloat> %v1, <8 x i32> <i32 8, i32 0, i32 10, i32 2, i32 12, i32 4, i32 14, i32 6>
+  ret <8 x bfloat> %tmp0
+}
+
 define <8 x bfloat> @trn2.v8bf16(<8 x bfloat> %v0, <8 x bfloat> %v1) {
 ; CHECK-LABEL: 'trn2.v8bf16'
 ; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <8 x bfloat> %v0, <8 x bfloat> %v1, <8 x i32> <i32 1, i32 9, i32 3, i32 11, i32 5, i32 13, i32 7, i32 15>
@@ -254,3 +497,12 @@ define <8 x bfloat> @trn2.v8bf16(<8 x bfloat> %v0, <8 x bfloat> %v1) {
   %tmp0 = shufflevector <8 x bfloat> %v0, <8 x bfloat> %v1, <8 x i32> <i32 1, i32 9, i32 3, i32 11, i32 5, i32 13, i32 7, i32 15>
   ret <8 x bfloat> %tmp0
 }
+
+define <8 x bfloat> @trn2.v8bf16_flipped(<8 x bfloat> %v0, <8 x bfloat> %v1) {
+; CHECK-LABEL: 'trn2.v8bf16_flipped'
+; CHECK-NEXT:  Cost Model: Found costs of 1 for: %tmp0 = shufflevector <8 x bfloat> %v0, <8 x bfloat> %v1, <8 x i32> <i32 9, i32 1, i32 11, i32 3, i32 13, i32 5, i32 15, i32 7>
+; CHECK-NEXT:  Cost Model: Found costs of RThru:0 CodeSize:1 Lat:1 SizeLat:1 for: ret <8 x bfloat> %tmp0
+;
+  %tmp0 = shufflevector <8 x bfloat> %v0, <8 x bfloat> %v1, <8 x i32> <i32 9, i32 1, i32 11, i32 3, i32 13, i32 5, i32 15, i32 7>
+  ret <8 x bfloat> %tmp0
+}
diff --git a/llvm/test/Transforms/SLPVectorizer/AArch64/extractelements-to-shuffle.ll b/llvm/test/Transforms/SLPVectorizer/AArch64/extractelements-to-shuffle.ll
index 10a17f7e3f9a6..7f737cd169147 100644
--- a/llvm/test/Transforms/SLPVectorizer/AArch64/extractelements-to-shuffle.ll
+++ b/llvm/test/Transforms/SLPVectorizer/AArch64/extractelements-to-shuffle.ll
@@ -645,19 +645,18 @@ define i1 @tryMapToRange(ptr %values, ptr %result, <2 x i64> %hi, <2 x i64> %lo)
 ; CHECK-NEXT:    [[S1:%.*]] = sext <2 x i1> [[C1]] to <2 x i64>
 ; CHECK-NEXT:    [[BC1:%.*]] = bitcast <2 x i64> [[S1]] to <16 x i8>
 ; CHECK-NEXT:    [[A1:%.*]] = and <16 x i8> [[BC1]], <i8 1, i8 poison, i8 poison, i8 poison, i8 poison, i8 poison, i8 poison, i8 poison, i8 1, i8 poison, i8 poison, i8 poison, i8 poison, i8 poison, i8 poison, i8 poison>
-; CHECK-NEXT:    [[TMP5:%.*]] = extractelement <16 x i8> [[A1]], i64 0
-; CHECK-NEXT:    [[TMP4:%.*]] = extractelement <16 x i8> [[A1]], i64 8
 ; CHECK-NEXT:    [[C2:%.*]] = icmp slt <2 x i64> [[L]], [[LO:%.*]]
 ; CHECK-NEXT:    [[S2:%.*]] = sext <2 x i1> [[C2]] to <2 x i64>
 ; CHECK-NEXT:    [[BC2:%.*]] = bitcast <2 x i64> [[S2]] to <16 x i8>
 ; CHECK-NEXT:    [[A2:%.*]] = and <16 x i8> [[BC2]], <i8 1, i8 poison, i8 poison, i8 poison, i8 poison, i8 poison, i8 poison, i8 poison, i8 1, i8 poison, i8 poison, i8 poison, i8 poison, i8 poison, i8 poison, i8 poison>
-; CHECK-NEXT:    [[E3:%.*]] = extractelement <16 x i8> [[A2]], i64 0
-; CHECK-NEXT:    [[E4:%.*]] = extractelement <16 x i8> [[A2]], i64 8
 ; CHECK-NEXT:    [[REASS_SUB:%.*]] = sub <2 x i64> [[L]], [[LO]]
 ; CHECK-NEXT:    [[ADD_I_I_I_I_I_I:%.*]] = add <2 x i64> [[REASS_SUB]], splat (i64 1)
 ; CHECK-NEXT:    store <2 x i64> [[ADD_I_I_I_I_I_I]], ptr [[RESULT:%.*]], align 8
-; CHECK-NEXT:    [[O3:%.*]] = or i8 [[TMP4]], [[TMP5]]
-; CHECK-NEXT:    [[O2:%.*]] = or i8 [[E4]], [[E3]]
+; CHECK-NEXT:    [[TMP1:%.*]] = shufflevector <16 x i8> [[A1]], <16 x i8> [[A2]], <2 x i32> <i32 8, i32 24>
+; CHECK-NEXT:    [[TMP2:%.*]] = shufflevector <16 x i8> [[A1]], <16 x i8> [[A2]], <2 x i32> <i32 0, i32 16>
+; CHECK-NEXT:    [[TMP3:%.*]] = or <2 x i8> [[TMP1]], [[TMP2]]
+; CHECK-NEXT:    [[O3:%.*]] = extractelement <2 x i8> [[TMP3]], i32 0
+; CHECK-NEXT:    [[O2:%.*]] = extractelement <2 x i8> [[TMP3]], i32 1
 ; CHECK-NEXT:    [[O4:%.*]] = or i8 [[O3]], [[O2]]
 ; CHECK-NEXT:    [[C:%.*]] = icmp eq i8 [[O4]], 0
 ; CHECK-NEXT:    ret i1 [[C]]
diff --git a/llvm/test/Transforms/SLPVectorizer/AArch64/transpose-with-constants.ll b/llvm/test/Transforms/SLPVectorizer/AArch64/transpose-with-constants.ll
new file mode 100644
index 0000000000000..66461c9d91064
--- /dev/null
+++ b/llvm/test/Transforms/SLPVectorizer/AArch64/transpose-with-constants.ll
@@ -0,0 +1,47 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -passes=slp-vectorizer -S | FileCheck %s
+
+target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
+target triple = "aarch64--linux-gnu"
+
+define dso_local <16 x i8> @transpose_splat_constants(i8 noundef %x) {
+; CHECK-LABEL: @transpose_splat_constants(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[TMP0:%.*]] = insertelement <8 x i8> poison, i8 [[X:%.*]], i32 0
+; CHECK-NEXT:    [[TMP1:%.*]] = shufflevector <8 x i8> [[TMP0]], <8 x i8> poison, <8 x i32> zeroinitializer
+; CHECK-NEXT:    [[TMP2:%.*]] = shufflevector <8 x i8> [[TMP1]], <8 x i8> poison, <16 x i32> <i32 0, i32 poison, i32 1, i32 poison, i32 2, i32 poison, i32 3, i32 poison, i32 4, i32 poison, i32 5, i32 poison, i32 6, i32 poison, i32 7, i32 poison>
+; CHECK-NEXT:    [[TMP3:%.*]] = shufflevector <16 x i8> <i8 poison, i8 0, i8 poison, i8 1, i8 poison, i8 2, i8 poison, i8 3, i8 poison, i8 4, i8 poison, i8 5, i8 poison, i8 6, i8 poison, i8 7>, <16 x i8> [[TMP2]], <16 x i32> <i32 16, i32 1, i32 18, i32 3, i32 20, i32 5, i32 22, i32 7, i32 24, i32 9, i32 26, i32 11, i32 28, i32 13, i32 30, i32 15>
+; CHECK-NEXT:    ret <16 x i8> [[TMP3]]
+;
+entry:
+  %0 = insertelement <16 x i8> <i8 poison, i8 0, i8 poison, i8 1, i8 poison, i8 2, i8 poison, i8 3, i8 poison, i8 4, i8 poison, i8 5, i8 poison, i8 6, i8 poison, i8 7>, i8 %x, i64 0
+  %1 = insertelement <16 x i8> %0, i8 %x, i64 2
+  %2 = insertelement <16 x i8> %1, i8 %x, i64 4
+  %3 = insertelement <16 x i8> %2, i8 %x, i64 6
+  %4 = insertelement <16 x i8> %3, i8 %x, i64 8
+  %5 = insertelement <16 x i8> %4, i8 %x, i64 10
+  %6 = insertelement <16 x i8> %5, i8 %x, i64 12
+  %7 = insertelement <16 x i8> %6, i8 %x, i64 14
+  ret <16 x i8> %7
+}
+
+define dso_local <16 x i8> @transpose_constants_splat(i8 noundef %x) {
+; CHECK-LABEL: @transpose_constants_splat(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[TMP0:%.*]] = insertelement <8 x i8> poison, i8 [[X:%.*]], i32 0
+; CHECK-NEXT:    [[TMP1:%.*]] = shufflevector <8 x i8> [[TMP0]], <8 x i8> poison, <8 x i32> zeroinitializer
+; CHECK-NEXT:    [[TMP2:%.*]] = shufflevector <8 x i8> [[TMP1]], <8 x i8> poison, <16 x i32> <i32 0, i32 poison, i32 1, i32 poison, i32 2, i32 poison, i32 3, i32 poison, i32 4, i32 poison, i32 5, i32 poison, i32 6, i32 poison, i32 7, i32 poison>
+; CHECK-NEXT:    [[TMP3:%.*]] = shufflevector <16 x i8> <i8 0, i8 poison, i8 1, i8 poison, i8 2, i8 poison, i8 3, i8 poison, i8 4, i8 poison, i8 5, i8 poison, i8 6, i8 poison, i8 7, i8 poison>, <16 x i8> [[TMP2]], <16 x i32> <i32 0, i32 16, i32 2, i32 18, i32 4, i32 20, i32 6, i32 22, i32 8, i32 24, i32 10, i32 26, i32 12, i32 28, i32 14, i32 30>
+; CHECK-NEXT:    ret <16 x i8> [[TMP3]]
+;
+entry:
+  %0 = insertelement <16 x i8> <i8 0, i8 poison, i8 1, i8 poison, i8 2, i8 poison, i8 3, i8 poison, i8 4, i8 poison, i8 5, i8 poison, i8 6, i8 poison, i8 7, i8 poison>, i8 %x, i64 1
+  %1 = insertelement <16 x i8> %0, i8 %x, i64 3
+  %2 = insertelement <16 x i8> %1, i8 %x, i64 5
+  %3 = insertelement <16 x i8> %2, i8 %x, i64 7
+  %4 = insertelement <16 x i8> %3, i8 %x, i64 9
+  %5 = insertelement <16 x i8> %4, i8 %x, i64 11
+  %6 = insertelement <16 x i8> %5, i8 %x, i64 13
+  %7 = insertelement <16 x i8> %6, i8 %x, i64 15
+  ret <16 x i8> %7
+}