Index: llvm/lib/Target/ARM/ARMISelLowering.cpp
===================================================================
--- llvm/lib/Target/ARM/ARMISelLowering.cpp
+++ llvm/lib/Target/ARM/ARMISelLowering.cpp
@@ -267,6 +267,9 @@
     setOperationAction(ISD::SREM, VT, Expand);
     setOperationAction(ISD::CTPOP, VT, Expand);
 
+    // Vector reductions
+    setOperationAction(ISD::VECREDUCE_ADD, VT, Legal);
+
     if (!HasMVEFP) {
       setOperationAction(ISD::SINT_TO_FP, VT, Expand);
       setOperationAction(ISD::UINT_TO_FP, VT, Expand);
Index: llvm/lib/Target/ARM/ARMInstrMVE.td
===================================================================
--- llvm/lib/Target/ARM/ARMInstrMVE.td
+++ llvm/lib/Target/ARM/ARMInstrMVE.td
@@ -549,6 +549,12 @@
 defm MVE_VADDVu16 : MVE_VADDV_A<"u16", 0b1, 0b01>;
 defm MVE_VADDVu32 : MVE_VADDV_A<"u32", 0b1, 0b10>;
 
+let Predicates = [HasMVEInt] in {
+  def : Pat<(i32 (vecreduce_add (v4i32 QPR:$src))), (i32 (MVE_VADDVu32no_acc $src))>;
+  def : Pat<(i32 (vecreduce_add (v8i16 QPR:$src))), (i32 (MVE_VADDVu16no_acc $src))>;
+  def : Pat<(i32 (vecreduce_add (v16i8 QPR:$src))), (i32 (MVE_VADDVu8no_acc $src))>;
+}
+
 class MVE_VADDLV<string iname, string suffix, dag iops, string cstr,
                bit A, bit U, list<dag> pattern=[]>
   : MVE_rDest<(outs tGPREven:$RdaLo, tGPROdd:$RdaHi), iops, NoItinerary, iname,
Index: llvm/lib/Target/ARM/ARMTargetTransformInfo.h
===================================================================
--- llvm/lib/Target/ARM/ARMTargetTransformInfo.h
+++ llvm/lib/Target/ARM/ARMTargetTransformInfo.h
@@ -156,6 +156,13 @@
 
   int getShuffleCost(TTI::ShuffleKind Kind, Type *Tp, int Index, Type *SubTp);
 
+  bool useReductionIntrinsic(unsigned Opcode, Type *Ty,
+                             TTI::ReductionFlags Flags) const;
+
+  bool shouldExpandReduction(const IntrinsicInst *II) const {
+    return false;
+  }
+
   int getCastInstrCost(unsigned Opcode, Type *Dst, Type *Src,
                        const Instruction *I = nullptr);
 
Index: llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
===================================================================
--- llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
+++ llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
@@ -919,3 +919,28 @@
   if (Cost < 12)
     UP.Force = true;
 }
+
+bool ARMTTIImpl::useReductionIntrinsic(unsigned Opcode, Type *Ty,
+                                       TTI::ReductionFlags Flags) const {
+  assert(isa<VectorType>(Ty) && "Expected Ty to be a vector type");
+  unsigned ScalarBits = Ty->getScalarSizeInBits();
+  if (!ST->hasMVEIntegerOps())
+    return false;
+
+  switch (Opcode) {
+  case Instruction::FAdd:
+  case Instruction::FMul:
+  case Instruction::And:
+  case Instruction::Or:
+  case Instruction::Xor:
+  case Instruction::Mul:
+  case Instruction::ICmp:
+  case Instruction::FCmp:
+    return false;
+  case Instruction::Add:
+    return ScalarBits * Ty->getVectorNumElements() == 128;
+  default:
+    llvm_unreachable("Unhandled reduction opcode");
+  }
+  return false;
+}
Index: llvm/test/CodeGen/ARM/vaddv.ll
===================================================================
--- /dev/null
+++ llvm/test/CodeGen/ARM/vaddv.ll
@@ -0,0 +1,34 @@
+; RUN: llc -mtriple=thumbv8.1m.main-arm-none-eabi -mattr=+mve.fp %s -o - | FileCheck %s
+
+declare i32 @llvm.experimental.vector.reduce.add.i32.v4i32(<4 x i32>)
+define arm_aapcs_vfpcc i32 @vaddv_v4i32_i32(<4 x i32> %s1) {
+; CHECK-LABEL: vaddv_v4i32_i32:
+; CHECK:       @ %bb.0: @ %entry
+; CHECK-NEXT:    vaddv.u32 r0, q0
+; CHECK-NEXT:    bx lr
+entry:
+  %r = call i32 @llvm.experimental.vector.reduce.add.i32.v4i32(<4 x i32> %s1)
+  ret i32 %r
+}
+
+declare i16 @llvm.experimental.vector.reduce.add.i16.v8i16(<8 x i16>)
+define arm_aapcs_vfpcc i16 @vaddv_v16i16_i16(<8 x i16> %s1) {
+; CHECK-LABEL: vaddv_v16i16_i16:
+; CHECK:       @ %bb.0: @ %entry
+; CHECK-NEXT:    vaddv.u16 r0, q0
+; CHECK-NEXT:    bx lr
+entry:
+  %r = call i16 @llvm.experimental.vector.reduce.add.i16.v8i16(<8 x i16> %s1)
+  ret i16 %r
+}
+
+declare i8 @llvm.experimental.vector.reduce.add.i8.v16i8(<16 x i8>)
+define arm_aapcs_vfpcc i8 @vaddv_v16i8_i8(<16 x i8> %s1) {
+; CHECK-LABEL: vaddv_v16i8_i8:
+; CHECK:       @ %bb.0: @ %entry
+; CHECK-NEXT:    vaddv.u8 r0, q0
+; CHECK-NEXT:    bx lr
+entry:
+  %r = call i8 @llvm.experimental.vector.reduce.add.i8.v16i8(<16 x i8> %s1)
+  ret i8 %r
+}