Index: llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp
===================================================================
--- llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp
+++ llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp
@@ -273,6 +273,8 @@
 
   bool SelectCMP_SWAP(SDNode *N);
 
+  bool SelectSVE8BitLslImm(SDValue N, SDValue &Imm, SDValue &Shift);
+
   bool SelectSVEAddSubImm(SDValue N, MVT VT, SDValue &Imm, SDValue &Shift);
 
   bool SelectSVELogicalImm(SDValue N, MVT VT, SDValue &Imm);
@@ -2918,6 +2920,32 @@
   return true;
 }
 
+bool AArch64DAGToDAGISel::SelectSVE8BitLslImm(SDValue N, SDValue &Base,
+                                                  SDValue &Offset) {
+  auto C = dyn_cast<ConstantSDNode>(N);
+  if (!C)
+    return false;
+
+  auto Ty = N->getValueType(0);
+
+  int64_t Imm = C->getSExtValue();
+  SDLoc DL(N);
+
+  if ((Imm >= -128) && (Imm <= 127)) {
+    Base = CurDAG->getTargetConstant(Imm, DL, Ty);
+    Offset = CurDAG->getTargetConstant(0, DL, Ty);
+    return true;
+  }
+
+  if (((Imm % 256) == 0) && (Imm >= -32768) && (Imm <= 32512)) {
+    Base = CurDAG->getTargetConstant(Imm/256, DL, Ty);
+    Offset = CurDAG->getTargetConstant(8, DL, Ty);
+    return true;
+  }
+
+  return false;
+}
+
 bool AArch64DAGToDAGISel::SelectSVEAddSubImm(SDValue N, MVT VT, SDValue &Imm, SDValue &Shift) {
   if (auto CNode = dyn_cast<ConstantSDNode>(N)) {
     const int64_t ImmVal = CNode->getZExtValue();
Index: llvm/lib/Target/AArch64/AArch64SVEInstrInfo.td
===================================================================
--- llvm/lib/Target/AArch64/AArch64SVEInstrInfo.td
+++ llvm/lib/Target/AArch64/AArch64SVEInstrInfo.td
@@ -10,6 +10,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+def SVE8BitLslImm : ComplexPattern<i32, 2, "SelectSVE8BitLslImm", [imm]>;
+
 def SDT_AArch64_LDNF1 : SDTypeProfile<1, 3, [
   SDTCisVec<0>, SDTCisVec<1>, SDTCisPtrTy<2>,
   SDTCVecEltisVT<1,i1>, SDTCisSameNumEltsAs<0,1>
@@ -318,6 +320,32 @@
   def : Pat<(nxv2f32 (AArch64dup (f32 fpimm0))), (DUP_ZI_S 0, 0)>;
   def : Pat<(nxv2f64 (AArch64dup (f64 fpimm0))), (DUP_ZI_D 0, 0)>;
 
+  // Duplicate Int immediate into all vector elements
+  def : Pat<(nxv16i8 (AArch64dup (i32 (SVE8BitLslImm i32:$a, i32:$b)))),
+            (DUP_ZI_B $a, $b)>;
+  def : Pat<(nxv8i16 (AArch64dup (i32 (SVE8BitLslImm i32:$a, i32:$b)))),
+            (DUP_ZI_H $a, $b)>;
+  def : Pat<(nxv4i32 (AArch64dup (i32 (SVE8BitLslImm i32:$a, i32:$b)))),
+            (DUP_ZI_S $a, $b)>;
+  def : Pat<(nxv2i64 (AArch64dup (i64 (SVE8BitLslImm i32:$a, i32:$b)))),
+            (DUP_ZI_D $a, $b)>;
+
+  // Duplicate FP immediate into all vector elements
+  let AddedComplexity = 2 in {
+    def : Pat<(nxv8f16 (AArch64dup fpimm16:$imm8)),
+              (FDUP_ZI_H fpimm16:$imm8)>;
+    def : Pat<(nxv4f16 (AArch64dup fpimm16:$imm8)),
+              (FDUP_ZI_H fpimm16:$imm8)>;
+    def : Pat<(nxv2f16 (AArch64dup fpimm16:$imm8)),
+              (FDUP_ZI_H fpimm16:$imm8)>;
+    def : Pat<(nxv4f32 (AArch64dup fpimm32:$imm8)),
+              (FDUP_ZI_S fpimm32:$imm8)>;
+    def : Pat<(nxv2f32 (AArch64dup fpimm32:$imm8)),
+              (FDUP_ZI_S fpimm32:$imm8)>;
+    def : Pat<(nxv2f64 (AArch64dup fpimm64:$imm8)),
+              (FDUP_ZI_D fpimm64:$imm8)>;
+  }
+
   // Select elements from either vector (predicated)
   defm SEL_ZPZZ    : sve_int_sel_vvv<"sel", vselect>;
 
Index: llvm/test/CodeGen/AArch64/sve-vector-splat.ll
===================================================================
--- llvm/test/CodeGen/AArch64/sve-vector-splat.ll
+++ llvm/test/CodeGen/AArch64/sve-vector-splat.ll
@@ -38,6 +38,42 @@
   ret <vscale x 2 x i64> %splat
 }
 
+define <vscale x 16 x i8> @sve_splat_16xi8_imm() {
+; CHECK-LABEL: @sve_splat_16xi8_imm
+; CHECK: mov z0.b, #1
+; CHECK-NEXT: ret
+  %ins = insertelement <vscale x 16 x i8> undef, i8 1, i32 0
+  %splat = shufflevector <vscale x 16 x i8> %ins, <vscale x 16 x i8> undef, <vscale x 16 x i32> zeroinitializer
+  ret <vscale x 16 x i8> %splat
+}
+
+define <vscale x 8 x i16> @sve_splat_8xi16_imm() {
+; CHECK-LABEL: @sve_splat_8xi16_imm
+; CHECK: mov z0.h, #1
+; CHECK-NEXT: ret
+  %ins = insertelement <vscale x 8 x i16> undef, i16 1, i32 0
+  %splat = shufflevector <vscale x 8 x i16> %ins, <vscale x 8 x i16> undef, <vscale x 8 x i32> zeroinitializer
+  ret <vscale x 8 x i16> %splat
+}
+
+define <vscale x 4 x i32> @sve_splat_4xi32_imm() {
+; CHECK-LABEL: @sve_splat_4xi32_imm
+; CHECK: mov z0.s, #1
+; CHECK-NEXT: ret
+  %ins = insertelement <vscale x 4 x i32> undef, i32 1, i32 0
+  %splat = shufflevector <vscale x 4 x i32> %ins, <vscale x 4 x i32> undef, <vscale x 4 x i32> zeroinitializer
+  ret <vscale x 4 x i32> %splat
+}
+
+define <vscale x 2 x i64> @sve_splat_2xi64_imm() {
+; CHECK-LABEL: @sve_splat_2xi64_imm
+; CHECK: mov z0.d, #1
+; CHECK-NEXT: ret
+  %ins = insertelement <vscale x 2 x i64> undef, i64 1, i32 0
+  %splat = shufflevector <vscale x 2 x i64> %ins, <vscale x 2 x i64> undef, <vscale x 2 x i32> zeroinitializer
+  ret <vscale x 2 x i64> %splat
+}
+
 ;; Promote splats of smaller illegal integer vector types
 
 define <vscale x 2 x i8> @sve_splat_2xi8(i8 %val) {
@@ -234,3 +270,60 @@
 ; CHECK-NEXT: ret
   ret <vscale x 2 x double> zeroinitializer
 }
+
+; TODO: The f16 constant should be folded into the move.
+define <vscale x 8 x half> @splat_nxv8f16_imm() {
+; CHECK-LABEL: splat_nxv8f16_imm:
+; CHECK: mov z0.h, h0
+; CHECK-NEXT: ret
+  %1 = insertelement <vscale x 8 x half> undef, half 1.0, i32 0
+  %2 = shufflevector <vscale x 8 x half> %1, <vscale x 8 x half> undef, <vscale x 8 x i32> zeroinitializer
+  ret <vscale x 8 x half> %2
+}
+
+; TODO: The f16 constant should be folded into the move.
+define <vscale x 4 x half> @splat_nxv4f16_imm() {
+; CHECK-LABEL: splat_nxv4f16_imm:
+; CHECK: mov z0.h, h0
+; CHECK-NEXT: ret
+  %1 = insertelement <vscale x 4 x half> undef, half 1.0, i32 0
+  %2 = shufflevector <vscale x 4 x half> %1, <vscale x 4 x half> undef, <vscale x 4 x i32> zeroinitializer
+  ret <vscale x 4 x half> %2
+}
+
+; TODO: The f16 constant should be folded into the move.
+define <vscale x 2 x half> @splat_nxv2f16_imm() {
+; CHECK-LABEL: splat_nxv2f16_imm:
+; CHECK: mov z0.h, h0
+; CHECK-NEXT: ret
+  %1 = insertelement <vscale x 2 x half> undef, half 1.0, i32 0
+  %2 = shufflevector <vscale x 2 x half> %1, <vscale x 2 x half> undef, <vscale x 2 x i32> zeroinitializer
+  ret <vscale x 2 x half> %2
+}
+
+define <vscale x 4 x float> @splat_nxv4f32_imm() {
+; CHECK-LABEL: splat_nxv4f32_imm:
+; CHECK: mov z0.s, #1.0
+; CHECK-NEXT: ret
+  %1 = insertelement <vscale x 4 x float> undef, float 1.0, i32 0
+  %2 = shufflevector <vscale x 4 x float> %1, <vscale x 4 x float> undef, <vscale x 4 x i32> zeroinitializer
+  ret <vscale x 4 x float> %2
+}
+
+define <vscale x 2 x float> @splat_nxv2f32_imm() {
+; CHECK-LABEL: splat_nxv2f32_imm:
+; CHECK: mov z0.s, #1.0
+; CHECK-NEXT: ret
+  %1 = insertelement <vscale x 2 x float> undef, float 1.0, i32 0
+  %2 = shufflevector <vscale x 2 x float> %1, <vscale x 2 x float> undef, <vscale x 2 x i32> zeroinitializer
+  ret <vscale x 2 x float> %2
+}
+
+define <vscale x 2 x double> @splat_nxv2f64_imm() {
+; CHECK-LABEL: splat_nxv2f64_imm:
+; CHECK: mov z0.d, #1.0
+; CHECK-NEXT: ret
+  %1 = insertelement <vscale x 2 x double> undef, double 1.0, i32 0
+  %2 = shufflevector <vscale x 2 x double> %1, <vscale x 2 x double> undef, <vscale x 2 x i32> zeroinitializer
+  ret <vscale x 2 x double> %2
+}