Index: llvm/lib/Target/AArch64/AArch64InstrInfo.td
===================================================================
--- llvm/lib/Target/AArch64/AArch64InstrInfo.td
+++ llvm/lib/Target/AArch64/AArch64InstrInfo.td
@@ -309,6 +309,34 @@
   return cast<MaskedLoadSDNode>(N)->getMemoryVT().getScalarType() == MVT::i32;
 }]>;
 
+// non-truncating masked store fragment.
+def nontrunc_masked_store :
+  PatFrag<(ops node:$val, node:$ptr, node:$pred),
+          (masked_st node:$val, node:$ptr, node:$pred), [{
+  return !cast<MaskedStoreSDNode>(N)->isTruncatingStore();
+}]>;
+// truncating masked store fragments.
+def trunc_masked_store :
+  PatFrag<(ops node:$val, node:$ptr, node:$pred),
+          (masked_st node:$val, node:$ptr, node:$pred), [{
+  return cast<MaskedStoreSDNode>(N)->isTruncatingStore();
+}]>;
+def trunc_masked_store_i8 :
+  PatFrag<(ops node:$val, node:$ptr, node:$pred),
+          (trunc_masked_store node:$val, node:$ptr, node:$pred), [{
+  return cast<MaskedStoreSDNode>(N)->getMemoryVT().getScalarType() == MVT::i8;
+}]>;
+def trunc_masked_store_i16 :
+  PatFrag<(ops node:$val, node:$ptr, node:$pred),
+          (trunc_masked_store node:$val, node:$ptr, node:$pred), [{
+  return cast<MaskedStoreSDNode>(N)->getMemoryVT().getScalarType() == MVT::i16;
+}]>;
+def trunc_masked_store_i32 :
+  PatFrag<(ops node:$val, node:$ptr, node:$pred),
+          (trunc_masked_store node:$val, node:$ptr, node:$pred), [{
+  return cast<MaskedStoreSDNode>(N)->getMemoryVT().getScalarType() == MVT::i32;
+}]>;
+
 // Node definitions.
 def AArch64adrp          : SDNode<"AArch64ISD::ADRP", SDTIntUnaryOp, []>;
 def AArch64adr           : SDNode<"AArch64ISD::ADR", SDTIntUnaryOp, []>;
Index: llvm/lib/Target/AArch64/AArch64SVEInstrInfo.td
===================================================================
--- llvm/lib/Target/AArch64/AArch64SVEInstrInfo.td
+++ llvm/lib/Target/AArch64/AArch64SVEInstrInfo.td
@@ -1108,6 +1108,36 @@
   // 16-element contiguous loads
   defm : pred_load<nxv16i8, nxv16i1, nonext_masked_load, LD1B_IMM>;
 
+  multiclass pred_store<ValueType Ty, ValueType PredTy, SDPatternOperator Store,
+                         Instruction RegImmInst> {
+    def _default : Pat<(Store (Ty ZPR:$vec), GPR64:$base, (PredTy PPR:$gp)),
+                       (RegImmInst ZPR:$vec, PPR:$gp, GPR64:$base, (i64 0))>;
+  }
+
+  // 2-element contiguous stores
+  defm : pred_store<nxv2i64, nxv2i1, trunc_masked_store_i8,  ST1B_D_IMM>;
+  defm : pred_store<nxv2i64, nxv2i1, trunc_masked_store_i16, ST1H_D_IMM>;
+  defm : pred_store<nxv2i64, nxv2i1, trunc_masked_store_i32, ST1W_D_IMM>;
+  defm : pred_store<nxv2i64, nxv2i1, nontrunc_masked_store,  ST1D_IMM>;
+  defm : pred_store<nxv2f16, nxv2i1, nontrunc_masked_store,  ST1H_D_IMM>;
+  defm : pred_store<nxv2f32, nxv2i1, nontrunc_masked_store,  ST1W_D_IMM>;
+  defm : pred_store<nxv2f64, nxv2i1, nontrunc_masked_store,  ST1D_IMM>;
+
+  // 4-element contiguous stores
+  defm : pred_store<nxv4i32, nxv4i1, trunc_masked_store_i8,  ST1B_S_IMM>;
+  defm : pred_store<nxv4i32, nxv4i1, trunc_masked_store_i16, ST1H_S_IMM>;
+  defm : pred_store<nxv4i32, nxv4i1, nontrunc_masked_store,  ST1W_IMM>;
+  defm : pred_store<nxv4f16, nxv4i1, nontrunc_masked_store,  ST1H_S_IMM>;
+  defm : pred_store<nxv4f32, nxv4i1, nontrunc_masked_store,  ST1W_IMM>;
+
+  // 8-element contiguous stores
+  defm : pred_store<nxv8i16, nxv8i1, trunc_masked_store_i8, ST1B_H_IMM>;
+  defm : pred_store<nxv8i16, nxv8i1, nontrunc_masked_store, ST1H_IMM>;
+  defm : pred_store<nxv8f16, nxv8i1, nontrunc_masked_store, ST1H_IMM>;
+
+  // 16-element contiguous stores
+  defm : pred_store<nxv16i8, nxv16i1, nontrunc_masked_store, ST1B_IMM>;
+
 }
 
 let Predicates = [HasSVE2] in {
Index: llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h
===================================================================
--- llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h
+++ llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h
@@ -147,7 +147,7 @@
 
   bool getTgtMemIntrinsic(IntrinsicInst *Inst, MemIntrinsicInfo &Info);
 
-  bool isLegalMaskedLoad(Type *DataType, MaybeAlign Alignment) {
+  bool isLegalMaskedLoadStore(Type *DataType, MaybeAlign Alignment) {
     if (!isa<VectorType>(DataType) || !ST->hasSVE())
       return false;
 
@@ -162,6 +162,14 @@
     return false;
   }
 
+  bool isLegalMaskedLoad(Type *DataType, MaybeAlign Alignment) {
+    return isLegalMaskedLoadStore(DataType, Alignment);
+  }
+
+  bool isLegalMaskedStore(Type *DataType, MaybeAlign Alignment) {
+    return isLegalMaskedLoadStore(DataType, Alignment);
+  }
+
   int getInterleavedMemoryOpCost(unsigned Opcode, Type *VecTy, unsigned Factor,
                                  ArrayRef<unsigned> Indices, unsigned Alignment,
                                  unsigned AddressSpace,
Index: llvm/test/CodeGen/AArch64/sve-masked-ldst-nonext.ll
===================================================================
--- llvm/test/CodeGen/AArch64/sve-masked-ldst-nonext.ll
+++ llvm/test/CodeGen/AArch64/sve-masked-ldst-nonext.ll
@@ -74,6 +74,80 @@
   ret <vscale x 8 x half> %load
 }
 
+;
+; Masked Stores
+;
+
+define void @masked_store_nxv2i64(<vscale x 2 x i64> *%a, <vscale x 2 x i64> %val, <vscale x 2 x i1> %mask) {
+; CHECK-LABEL: masked_store_nxv2i64:
+; CHECK: st1d { [[IN]].d }, [[PG]], [x0]
+  call void @llvm.masked.store.nxv2i64(<vscale x 2 x i64> %val, <vscale x 2 x i64> *%a, i32 8, <vscale x 2 x i1> %mask)
+  ret void
+}
+
+define void @masked_store_nxv4i32(<vscale x 4 x i32> *%a, <vscale x 4 x i32> %val, <vscale x 4 x i1> %mask) {
+; CHECK-LABEL: masked_store_nxv4i32:
+; CHECK: st1w { [[IN]].s }, [[PG]], [x0]
+  call void @llvm.masked.store.nxv4i32(<vscale x 4 x i32> %val, <vscale x 4 x i32> *%a, i32 4, <vscale x 4 x i1> %mask)
+  ret void
+}
+
+define void @masked_store_nxv8i16(<vscale x 8 x i16> *%a, <vscale x 8 x i16> %val, <vscale x 8 x i1> %mask) {
+; CHECK-LABEL: masked_store_nxv8i16:
+; CHECK: st1h { [[IN]].h }, [[PG]], [x0]
+  call void @llvm.masked.store.nxv8i16(<vscale x 8 x i16> %val, <vscale x 8 x i16> *%a, i32 2, <vscale x 8 x i1> %mask)
+  ret void
+}
+
+define void @masked_store_nxv16i8(<vscale x 16 x i8> *%a, <vscale x 16 x i8> %val, <vscale x 16 x i1> %mask) {
+; CHECK-LABEL: masked_store_nxv16i8:
+; CHECK: st1b { [[IN]].b }, [[PG]], [x0]
+  call void @llvm.masked.store.nxv16i8(<vscale x 16 x i8> %val, <vscale x 16 x i8> *%a, i32 1, <vscale x 16 x i1> %mask)
+  ret void
+}
+
+define void @masked_store_nxv2f64(<vscale x 2 x double> *%a, <vscale x 2 x double> %val, <vscale x 2 x i1> %mask) {
+; CHECK-LABEL: masked_store_nxv2f64:
+; CHECK: st1d { [[IN]].d }, [[PG]], [x0]
+  call void @llvm.masked.store.nxv2f64(<vscale x 2 x double> %val, <vscale x 2 x double> *%a, i32 8, <vscale x 2 x i1> %mask)
+  ret void
+}
+
+define void @masked_store_nxv2f32(<vscale x 2 x float> *%a, <vscale x 2 x float> %val, <vscale x 2 x i1> %mask) {
+; CHECK-LABEL: masked_store_nxv2f32:
+; CHECK: st1w { [[IN]].d }, [[PG]], [x0]
+  call void @llvm.masked.store.nxv2f32(<vscale x 2 x float> %val, <vscale x 2 x float> *%a, i32 4, <vscale x 2 x i1> %mask)
+  ret void
+}
+
+define void @masked_store_nxv2f16(<vscale x 2 x half> *%a, <vscale x 2 x half> %val, <vscale x 2 x i1> %mask) {
+; CHECK-LABEL: masked_store_nxv2f16:
+; CHECK: st1h { [[IN]].d }, [[PG]], [x0]
+  call void @llvm.masked.store.nxv2f16(<vscale x 2 x half> %val, <vscale x 2 x half> *%a, i32 4, <vscale x 2 x i1> %mask)
+  ret void
+}
+
+define void @masked_store_nxv4f32(<vscale x 4 x float> *%a, <vscale x 4 x float> %val, <vscale x 4 x i1> %mask) {
+; CHECK-LABEL: masked_store_nxv4f32:
+; CHECK: st1w { [[IN]].s }, [[PG]], [x0]
+  call void @llvm.masked.store.nxv4f32(<vscale x 4 x float> %val, <vscale x 4 x float> *%a, i32 4, <vscale x 4 x i1> %mask)
+  ret void
+}
+
+define void @masked_store_nxv4f16(<vscale x 4 x half> *%a, <vscale x 4 x half> %val, <vscale x 4 x i1> %mask) {
+; CHECK-LABEL: masked_store_nxv4f16:
+; CHECK: st1h { [[IN]].s }, [[PG]], [x0]
+  call void @llvm.masked.store.nxv4f16(<vscale x 4 x half> %val, <vscale x 4 x half> *%a, i32 2, <vscale x 4 x i1> %mask)
+  ret void
+}
+
+define void @masked_store_nxv8f16(<vscale x 8 x half> *%a, <vscale x 8 x half> %val, <vscale x 8 x i1> %mask) {
+; CHECK-LABEL: masked_store_nxv8f16:
+; CHECK: st1h { [[IN]].h }, [[PG]], [x0]
+  call void @llvm.masked.store.nxv8f16(<vscale x 8 x half> %val, <vscale x 8 x half> *%a, i32 2, <vscale x 8 x i1> %mask)
+  ret void
+}
+
 declare <vscale x 2 x i64> @llvm.masked.load.nxv2i64(<vscale x 2 x i64>*, i32, <vscale x 2 x i1>, <vscale x 2 x i64>)
 declare <vscale x 4 x i32> @llvm.masked.load.nxv4i32(<vscale x 4 x i32>*, i32, <vscale x 4 x i1>, <vscale x 4 x i32>)
 declare <vscale x 8 x i16> @llvm.masked.load.nxv8i16(<vscale x 8 x i16>*, i32, <vscale x 8 x i1>, <vscale x 8 x i16>)
@@ -85,3 +159,15 @@
 declare <vscale x 4 x float> @llvm.masked.load.nxv4f32(<vscale x 4 x float>*, i32, <vscale x 4 x i1>, <vscale x 4 x float>)
 declare <vscale x 4 x half> @llvm.masked.load.nxv4f16(<vscale x 4 x half>*, i32, <vscale x 4 x i1>, <vscale x 4 x half>)
 declare <vscale x 8 x half> @llvm.masked.load.nxv8f16(<vscale x 8 x half>*, i32, <vscale x 8 x i1>, <vscale x 8 x half>)
+
+declare void @llvm.masked.store.nxv2i64(<vscale x 2 x i64>, <vscale x 2 x i64>*, i32, <vscale x 2 x i1>)
+declare void @llvm.masked.store.nxv4i32(<vscale x 4 x i32>, <vscale x 4 x i32>*, i32, <vscale x 4 x i1>)
+declare void @llvm.masked.store.nxv8i16(<vscale x 8 x i16>, <vscale x 8 x i16>*, i32, <vscale x 8 x i1>)
+declare void @llvm.masked.store.nxv16i8(<vscale x 16 x i8>, <vscale x 16 x i8>*, i32, <vscale x 16 x i1>)
+
+declare void @llvm.masked.store.nxv2f64(<vscale x 2 x double>, <vscale x 2 x double>*, i32, <vscale x 2 x i1>)
+declare void @llvm.masked.store.nxv2f32(<vscale x 2 x float>, <vscale x 2 x float>*, i32, <vscale x 2 x i1>)
+declare void @llvm.masked.store.nxv2f16(<vscale x 2 x half>, <vscale x 2 x half>*, i32, <vscale x 2 x i1>)
+declare void @llvm.masked.store.nxv4f32(<vscale x 4 x float>, <vscale x 4 x float>*, i32, <vscale x 4 x i1>)
+declare void @llvm.masked.store.nxv4f16(<vscale x 4 x half>, <vscale x 4 x half>*, i32, <vscale x 4 x i1>)
+declare void @llvm.masked.store.nxv8f16(<vscale x 8 x half>, <vscale x 8 x half>*, i32, <vscale x 8 x i1>)
Index: llvm/test/CodeGen/AArch64/sve-masked-ldst-trunc.ll
===================================================================
--- /dev/null
+++ llvm/test/CodeGen/AArch64/sve-masked-ldst-trunc.ll
@@ -0,0 +1,60 @@
+; RUN: llc -mtriple=aarch64--linux-gnu -mattr=+sve < %s | FileCheck %s
+
+;
+; Masked Stores
+;
+
+define void @masked_trunc_store_nxv2i8(<vscale x 2 x i64> *%a, <vscale x 2 x i64> %val, <vscale x 2 x i8> *%b, <vscale x 2 x i1> %mask) {
+; CHECK-LABEL: masked_trunc_store_nxv2i8:
+; CHECK: st1b { [[IN:z[0-9]]].d }, [[PG:p[0-9]]], [x1]
+  %trunc = trunc <vscale x 2 x i64> %val to <vscale x 2 x i8>
+  call void @llvm.masked.store.nxv2i8(<vscale x 2 x i8> %trunc, <vscale x 2 x i8> *%b, i32 8, <vscale x 2 x i1> %mask)
+  ret void
+}
+
+define void @masked_trunc_store_nxv2i16(<vscale x 2 x i64> *%a, <vscale x 2 x i64> %val, <vscale x 2 x i16> *%b, <vscale x 2 x i1> %mask) {
+; CHECK-LABEL: masked_trunc_store_nxv2i16:
+; CHECK: st1h { [[IN:z[0-9]]].d }, [[PG:p[0-9]]], [x1]
+  %trunc = trunc <vscale x 2 x i64> %val to <vscale x 2 x i16>
+  call void @llvm.masked.store.nxv2i16(<vscale x 2 x i16> %trunc, <vscale x 2 x i16> *%b, i32 8, <vscale x 2 x i1> %mask)
+  ret void
+}
+
+define void @masked_trunc_store_nxv2i32(<vscale x 2 x i64> *%a, <vscale x 2 x i64> %val, <vscale x 2 x i32> *%b, <vscale x 2 x i1> %mask) {
+; CHECK-LABEL: masked_trunc_store_nxv2i32:
+; CHECK: st1w { [[IN:z[0-9]]].d }, [[PG:p[0-9]]], [x1]
+  %trunc = trunc <vscale x 2 x i64> %val to <vscale x 2 x i32>
+  call void @llvm.masked.store.nxv2i32(<vscale x 2 x i32> %trunc, <vscale x 2 x i32> *%b, i32 8, <vscale x 2 x i1> %mask)
+  ret void
+}
+
+define void @masked_trunc_store_nxv4i8(<vscale x 4 x i32> *%a, <vscale x 4 x i32> %val, <vscale x 4 x i8> *%b, <vscale x 4 x i1> %mask) {
+; CHECK-LABEL: masked_trunc_store_nxv4i8:
+; CHECK: st1b { [[IN:z[0-9]]].s }, [[PG:p[0-9]]], [x1]
+  %trunc = trunc <vscale x 4 x i32> %val to <vscale x 4 x i8>
+  call void @llvm.masked.store.nxv4i8(<vscale x 4 x i8> %trunc, <vscale x 4 x i8> *%b, i32 4, <vscale x 4 x i1> %mask)
+  ret void
+}
+
+define void @masked_trunc_store_nxv4i16(<vscale x 4 x i32> *%a, <vscale x 4 x i32> %val, <vscale x 4 x i16> *%b, <vscale x 4 x i1> %mask) {
+; CHECK-LABEL: masked_trunc_store_nxv4i16:
+; CHECK: st1h { [[IN:z[0-9]]].s }, [[PG:p[0-9]]], [x1]
+  %trunc = trunc <vscale x 4 x i32> %val to <vscale x 4 x i16>
+  call void @llvm.masked.store.nxv4i16(<vscale x 4 x i16> %trunc, <vscale x 4 x i16> *%b, i32 4, <vscale x 4 x i1> %mask)
+  ret void
+}
+
+define void @masked_trunc_store_nxv8i8(<vscale x 8 x i16> *%a, <vscale x 8 x i16> %val, <vscale x 8 x i8> *%b, <vscale x 8 x i1> %mask) {
+; CHECK-LABEL: masked_trunc_store_nxv8i8:
+; CHECK: st1b { [[IN:z[0-9]]].h }, [[PG:p[0-9]]], [x1]
+  %trunc = trunc <vscale x 8 x i16> %val to <vscale x 8 x i8>
+  call void @llvm.masked.store.nxv8i8(<vscale x 8 x i8> %trunc, <vscale x 8 x i8> *%b, i32 2, <vscale x 8 x i1> %mask)
+  ret void
+}
+
+declare void @llvm.masked.store.nxv2i8(<vscale x 2 x i8>, <vscale x 2 x i8>*, i32, <vscale x 2 x i1>)
+declare void @llvm.masked.store.nxv2i16(<vscale x 2 x i16>, <vscale x 2 x i16>*, i32, <vscale x 2 x i1>)
+declare void @llvm.masked.store.nxv2i32(<vscale x 2 x i32>, <vscale x 2 x i32>*, i32, <vscale x 2 x i1>)
+declare void @llvm.masked.store.nxv4i8(<vscale x 4 x i8>, <vscale x 4 x i8>*, i32, <vscale x 4 x i1>)
+declare void @llvm.masked.store.nxv4i16(<vscale x 4 x i16>, <vscale x 4 x i16>*, i32, <vscale x 4 x i1>)
+declare void @llvm.masked.store.nxv8i8(<vscale x 8 x i8>, <vscale x 8 x i8>*, i32, <vscale x 8 x i1>)