From: Caroline Concatto <caroline.concatto@arm.com>
Date: Mon, 21 Dec 2020 15:04:29 +0000 (+0000)
Subject: [AArch64][SVE]Add cost model for vector reduce for scalable vector
X-Git-Tag: llvmorg-13-init~844
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=172f1f8952c977c0101ba19e6ecb9474aa3bdd4b;p=platform%2Fupstream%2Fllvm.git

[AArch64][SVE]Add cost model for vector reduce for scalable vector

This patch computes the cost for vector.reduce<operand> for scalable vectors.
The cost is split into two parts:  the legalization cost and the horizontal
reduction.

Differential Revision: https://reviews.llvm.org/D93639
---

diff --git a/llvm/include/llvm/CodeGen/BasicTTIImpl.h b/llvm/include/llvm/CodeGen/BasicTTIImpl.h
index 9776c20..3f016d8 100644
--- a/llvm/include/llvm/CodeGen/BasicTTIImpl.h
+++ b/llvm/include/llvm/CodeGen/BasicTTIImpl.h
@@ -1288,15 +1288,11 @@ public:
     case Intrinsic::vector_reduce_fmin:
     case Intrinsic::vector_reduce_umax:
     case Intrinsic::vector_reduce_umin: {
-      if (isa<ScalableVectorType>(RetTy))
-        return BaseT::getIntrinsicInstrCost(ICA, CostKind);
       IntrinsicCostAttributes Attrs(IID, RetTy, Args[0]->getType(), FMF, 1, I);
       return getTypeBasedIntrinsicInstrCost(Attrs, CostKind);
     }
     case Intrinsic::vector_reduce_fadd:
     case Intrinsic::vector_reduce_fmul: {
-      if (isa<ScalableVectorType>(RetTy))
-        return BaseT::getIntrinsicInstrCost(ICA, CostKind);
       IntrinsicCostAttributes Attrs(
           IID, RetTy, {Args[0]->getType(), Args[1]->getType()}, FMF, 1, I);
       return getTypeBasedIntrinsicInstrCost(Attrs, CostKind);
diff --git a/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp b/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
index 68d382f..ffa0458 100644
--- a/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
+++ b/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
@@ -1096,11 +1096,70 @@ bool AArch64TTIImpl::useReductionIntrinsic(unsigned Opcode, Type *Ty,
   return false;
 }
 
+int AArch64TTIImpl::getMinMaxReductionCost(VectorType *Ty, VectorType *CondTy,
+                                           bool IsPairwise, bool IsUnsigned,
+                                           TTI::TargetCostKind CostKind) {
+  if (!isa<ScalableVectorType>(Ty))
+    return BaseT::getMinMaxReductionCost(Ty, CondTy, IsPairwise, IsUnsigned,
+                                         CostKind);
+  assert((isa<ScalableVectorType>(Ty) && isa<ScalableVectorType>(CondTy)) &&
+         "Both vector needs to be scalable");
+
+  std::pair<int, MVT> LT = TLI->getTypeLegalizationCost(DL, Ty);
+  int LegalizationCost = 0;
+  if (LT.first > 1) {
+    Type *LegalVTy = EVT(LT.second).getTypeForEVT(Ty->getContext());
+    unsigned CmpOpcode =
+        Ty->isFPOrFPVectorTy() ? Instruction::FCmp : Instruction::ICmp;
+    LegalizationCost =
+        getCmpSelInstrCost(CmpOpcode, LegalVTy, LegalVTy,
+                           CmpInst::BAD_ICMP_PREDICATE, CostKind) +
+        getCmpSelInstrCost(Instruction::Select, LegalVTy, LegalVTy,
+                           CmpInst::BAD_ICMP_PREDICATE, CostKind);
+    LegalizationCost *= LT.first - 1;
+  }
+
+  return LegalizationCost + /*Cost of horizontal reduction*/ 2;
+}
+
+int AArch64TTIImpl::getArithmeticReductionCostSVE(
+    unsigned Opcode, VectorType *ValTy, bool IsPairwise,
+    TTI::TargetCostKind CostKind) {
+  assert(!IsPairwise && "Cannot be pair wise to continue");
+
+  std::pair<int, MVT> LT = TLI->getTypeLegalizationCost(DL, ValTy);
+  int LegalizationCost = 0;
+  if (LT.first > 1) {
+    Type *LegalVTy = EVT(LT.second).getTypeForEVT(ValTy->getContext());
+    LegalizationCost = getArithmeticInstrCost(Opcode, LegalVTy, CostKind);
+    LegalizationCost *= LT.first - 1;
+  }
+
+  int ISD = TLI->InstructionOpcodeToISD(Opcode);
+  assert(ISD && "Invalid opcode");
+  // Add the final reduction cost for the legal horizontal reduction
+  switch (ISD) {
+  case ISD::ADD:
+  case ISD::AND:
+  case ISD::OR:
+  case ISD::XOR:
+  case ISD::FADD:
+    return LegalizationCost + 2;
+  default:
+    // TODO: Replace for invalid when InstructionCost is used
+    // cases not supported by SVE
+    return 16;
+  }
+}
+
 int AArch64TTIImpl::getArithmeticReductionCost(unsigned Opcode,
                                                VectorType *ValTy,
                                                bool IsPairwiseForm,
                                                TTI::TargetCostKind CostKind) {
 
+  if (isa<ScalableVectorType>(ValTy))
+    return getArithmeticReductionCostSVE(Opcode, ValTy, IsPairwiseForm,
+                                         CostKind);
   if (IsPairwiseForm)
     return BaseT::getArithmeticReductionCost(Opcode, ValTy, IsPairwiseForm,
                                              CostKind);
diff --git a/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h b/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h
index 7dded02b..7c9360ad 100644
--- a/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h
+++ b/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h
@@ -139,6 +139,14 @@ public:
 
   int getVectorInstrCost(unsigned Opcode, Type *Val, unsigned Index);
 
+  int getMinMaxReductionCost(VectorType *Ty, VectorType *CondTy,
+                             bool IsPairwise, bool IsUnsigned,
+                             TTI::TargetCostKind CostKind);
+
+  int getArithmeticReductionCostSVE(unsigned Opcode, VectorType *ValTy,
+                                    bool IsPairwiseForm,
+                                    TTI::TargetCostKind CostKind);
+
   int getArithmeticInstrCost(
       unsigned Opcode, Type *Ty,
       TTI::TargetCostKind CostKind = TTI::TCK_RecipThroughput,
diff --git a/llvm/test/Analysis/CostModel/AArch64/sve-getIntrinsicInstrCost-vector-reduce.ll b/llvm/test/Analysis/CostModel/AArch64/sve-getIntrinsicInstrCost-vector-reduce.ll
new file mode 100644
index 0000000..486e7aa
--- /dev/null
+++ b/llvm/test/Analysis/CostModel/AArch64/sve-getIntrinsicInstrCost-vector-reduce.ll
@@ -0,0 +1,251 @@
+; Check getIntrinsicInstrCost in BasicTTIImpl.h with SVE for vector.reduce.<operand>
+; Checks legal and not legal vector size
+
+; RUN: opt -cost-model -analyze -mtriple=aarch64--linux-gnu -mattr=+sve  < %s 2>%t | FileCheck %s
+
+
+; If this check fails please read test/CodeGen/AArch64/README for instructions on how to resolve it.
+; WARN-NOT: warning
+
+define i32 @add.i32.nxv4i32(<vscale x 4 x i32> %v) {
+; CHECK-LABEL: 'add.i32.nxv4i32'
+; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction:   %r = call i32 @llvm.vector.reduce.add.nxv4i32(<vscale x 4 x i32> %v)
+; CHECK-NEXT:Cost Model: Found an estimated cost of 0 for instruction:   ret i32 %r
+
+  %r = call i32 @llvm.vector.reduce.add.nxv4i32(<vscale x 4 x i32> %v)
+  ret i32 %r
+}
+
+define i64 @add.i64.nxv4i64(<vscale x 4 x i64> %v) {
+; CHECK-LABEL: 'add.i64.nxv4i64'
+; CHECK-NEXT: Cost Model: Found an estimated cost of 3 for instruction:   %r = call i64 @llvm.vector.reduce.add.nxv4i64(<vscale x 4 x i64> %v)
+; CHECK-NEXT:Cost Model: Found an estimated cost of 0 for instruction:   ret i64 %r
+
+  %r = call i64 @llvm.vector.reduce.add.nxv4i64(<vscale x 4 x i64> %v)
+  ret i64 %r
+}
+
+define i32 @mul.i32.nxv4i32(<vscale x 4 x i32> %v) {
+; CHECK-LABEL: 'mul.i32.nxv4i32'
+; CHECK-NEXT: Cost Model: Found an estimated cost of 16 for instruction:   %r = call i32 @llvm.vector.reduce.mul.nxv4i32(<vscale x 4 x i32> %v)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction:   ret i32 %r
+
+  %r = call i32 @llvm.vector.reduce.mul.nxv4i32(<vscale x 4 x i32> %v)
+  ret i32 %r
+}
+
+define i64 @mul.i64.nxv4i64(<vscale x 4 x i64> %v) {
+; CHECK-LABEL: 'mul.i64.nxv4i64'
+; CHECK-NEXT: Cost Model: Found an estimated cost of 16 for instruction:   %r = call i64 @llvm.vector.reduce.mul.nxv4i64(<vscale x 4 x i64> %v)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction:   ret i64 %r
+
+  %r = call i64 @llvm.vector.reduce.mul.nxv4i64(<vscale x 4 x i64> %v)
+  ret i64 %r
+}
+
+define i32 @and.i32.nxv4i32(<vscale x 4 x i32> %v) {
+; CHECK-LABEL: 'and.i32.nxv4i32'
+; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction:   %r = call i32 @llvm.vector.reduce.and.nxv4i32(<vscale x 4 x i32> %v)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction:   ret i32 %r
+
+  %r = call i32 @llvm.vector.reduce.and.nxv4i32(<vscale x 4 x i32> %v)
+  ret i32 %r
+}
+
+define i64 @and.i64.nxv4i64(<vscale x 4 x i64> %v) {
+; CHECK-LABEL: 'and.i64.nxv4i64'
+; CHECK-NEXT: Cost Model: Found an estimated cost of 3 for instruction:   %r = call i64 @llvm.vector.reduce.and.nxv4i64(<vscale x 4 x i64> %v)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction:   ret i64 %r
+
+  %r = call i64 @llvm.vector.reduce.and.nxv4i64(<vscale x 4 x i64> %v)
+  ret i64 %r
+}
+
+define i32 @or.i32.nxv4i32(<vscale x 4 x i32> %v) {
+; CHECK-LABEL: 'or.i32.nxv4i32'
+; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction:   %r = call i32 @llvm.vector.reduce.or.nxv4i32(<vscale x 4 x i32> %v)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction:   ret i32 %r
+
+  %r = call i32 @llvm.vector.reduce.or.nxv4i32(<vscale x 4 x i32> %v)
+  ret i32 %r
+}
+
+define i64 @or.i64.nxv4i64(<vscale x 4 x i64> %v) {
+; CHECK-LABEL: 'or.i64.nxv4i64'
+; CHECK-NEXT: Cost Model: Found an estimated cost of 3 for instruction:   %r = call i64 @llvm.vector.reduce.or.nxv4i64(<vscale x 4 x i64> %v)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction:   ret i64 %r
+
+  %r = call i64 @llvm.vector.reduce.or.nxv4i64(<vscale x 4 x i64> %v)
+  ret i64 %r
+}
+
+define i32 @xor.i32.nxv4i32(<vscale x 4 x i32> %v) {
+; CHECK-LABEL: 'xor.i32.nxv4i32'
+; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction:   %r = call i32 @llvm.vector.reduce.xor.nxv4i32(<vscale x 4 x i32> %v)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction:   ret i32 %r
+
+  %r = call i32 @llvm.vector.reduce.xor.nxv4i32(<vscale x 4 x i32> %v)
+  ret i32 %r
+}
+
+define i64 @xor.i64.nxv4i64(<vscale x 4 x i64> %v) {
+; CHECK-LABEL: 'xor.i64.nxv4i64'
+; CHECK-NEXT: Cost Model: Found an estimated cost of 3 for instruction:   %r = call i64 @llvm.vector.reduce.xor.nxv4i64(<vscale x 4 x i64> %v)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction:   ret i64 %r
+
+  %r = call i64 @llvm.vector.reduce.xor.nxv4i64(<vscale x 4 x i64> %v)
+  ret i64 %r
+}
+
+define i32 @umin.i32.nxv4i32(<vscale x 4 x i32> %v) {
+; CHECK-LABEL: 'umin.i32.nxv4i32'
+; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction:   %r = call i32 @llvm.vector.reduce.umin.nxv4i32(<vscale x 4 x i32> %v)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction:   ret i32 %r
+
+  %r = call i32 @llvm.vector.reduce.umin.nxv4i32(<vscale x 4 x i32> %v)
+  ret i32 %r
+}
+
+define i64 @umin.i64.nxv4i64(<vscale x 4 x i64> %v) {
+; CHECK-LABEL: 'umin.i64.nxv4i64'
+; CHECK-NEXT: Cost Model: Found an estimated cost of 4 for instruction:   %r = call i64 @llvm.vector.reduce.umin.nxv4i64(<vscale x 4 x i64> %v)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction:   ret i64 %r
+
+  %r = call i64 @llvm.vector.reduce.umin.nxv4i64(<vscale x 4 x i64> %v)
+  ret i64 %r
+}
+
+define float @fmax.f32.nxv4f32(<vscale x 4 x float> %v) {
+; CHECK-LABEL: 'fmax.f32.nxv4f32'
+; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction:   %r = call float @llvm.vector.reduce.fmax.nxv4f32(<vscale x 4 x float> %v)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction:   ret float %r
+
+  %r = call float @llvm.vector.reduce.fmax.nxv4f32(<vscale x 4 x float> %v)
+  ret float %r
+}
+
+define double @fmax.f64.nxv4f64(<vscale x 4 x double> %v) {
+; CHECK-LABEL: 'fmax.f64.nxv4f64'
+; CHECK-NEXT: Cost Model: Found an estimated cost of 4 for instruction:   %r = call double @llvm.vector.reduce.fmax.nxv4f64(<vscale x 4 x double> %v)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction:   ret double %r
+
+  %r = call double @llvm.vector.reduce.fmax.nxv4f64(<vscale x 4 x double> %v)
+  ret double %r
+}
+
+define float @fmin.f32.nxv4f32(<vscale x 4 x float> %v) {
+; CHECK-LABEL: 'fmin.f32.nxv4f32'
+; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction:   %r = call float @llvm.vector.reduce.fmin.nxv4f32(<vscale x 4 x float> %v)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction:   ret float %r
+
+  %r = call float @llvm.vector.reduce.fmin.nxv4f32(<vscale x 4 x float> %v)
+  ret float %r
+}
+
+define double @fmin.f64.nxv4f64(<vscale x 4 x double> %v) {
+; CHECK-LABEL: 'fmin.f64.nxv4f64'
+; CHECK-NEXT: Cost Model: Found an estimated cost of 4 for instruction:   %r = call double @llvm.vector.reduce.fmin.nxv4f64(<vscale x 4 x double> %v)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction:   ret double %r
+
+  %r = call double @llvm.vector.reduce.fmin.nxv4f64(<vscale x 4 x double> %v)
+  ret double %r
+}
+
+define i32 @umax.i32.nxv4i32(<vscale x 4 x i32> %v) {
+; CHECK-LABEL: 'umax.i32.nxv4i32'
+; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction:   %r = call i32 @llvm.vector.reduce.umax.nxv4i32(<vscale x 4 x i32> %v)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction:   ret i32 %r
+
+  %r = call i32 @llvm.vector.reduce.umax.nxv4i32(<vscale x 4 x i32> %v)
+  ret i32 %r
+}
+
+define i64 @umax.i64.nxv4i64(<vscale x 4 x i64> %v) {
+; CHECK-LABEL: 'umax.i64.nxv4i64'
+; CHECK-NEXT: Cost Model: Found an estimated cost of 4 for instruction:   %r = call i64 @llvm.vector.reduce.umax.nxv4i64(<vscale x 4 x i64> %v)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction:   ret i64 %r
+
+  %r = call i64 @llvm.vector.reduce.umax.nxv4i64(<vscale x 4 x i64> %v)
+  ret i64 %r
+}
+
+define i32 @smin.i32.nxv4i32(<vscale x 4 x i32> %v) {
+; CHECK-LABEL: 'smin.i32.nxv4i32'
+; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction:   %r = call i32 @llvm.vector.reduce.smin.nxv4i32(<vscale x 4 x i32> %v)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction:   ret i32 %r
+
+  %r = call i32 @llvm.vector.reduce.smin.nxv4i32(<vscale x 4 x i32> %v)
+  ret i32 %r
+}
+
+define i64 @smin.i64.nxv4i64(<vscale x 4 x i64> %v) {
+; CHECK-LABEL: 'smin.i64.nxv4i64'
+; CHECK-NEXT: Cost Model: Found an estimated cost of 4 for instruction:   %r = call i64 @llvm.vector.reduce.smin.nxv4i64(<vscale x 4 x i64> %v)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction:   ret i64 %r
+
+  %r = call i64 @llvm.vector.reduce.smin.nxv4i64(<vscale x 4 x i64> %v)
+  ret i64 %r
+}
+
+define i32 @smax.i32.nxv4i32(<vscale x 4 x i32> %v) {
+; CHECK-LABEL: 'smax.i32.nxv4i32'
+; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction:   %r = call i32 @llvm.vector.reduce.smax.nxv4i32(<vscale x 4 x i32> %v)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction:   ret i32 %r
+
+  %r = call i32 @llvm.vector.reduce.smax.nxv4i32(<vscale x 4 x i32> %v)
+  ret i32 %r
+}
+
+define i64 @smax.i64.nxv4i64(<vscale x 4 x i64> %v) {
+; CHECK-LABEL: 'smax.i64.nxv4i64'
+; CHECK-NEXT: Cost Model: Found an estimated cost of 4 for instruction:   %r = call i64 @llvm.vector.reduce.smax.nxv4i64(<vscale x 4 x i64> %v)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction:   ret i64 %r
+
+  %r = call i64 @llvm.vector.reduce.smax.nxv4i64(<vscale x 4 x i64> %v)
+  ret i64 %r
+}
+
+define float @fadda_nxv4f32(float %start, <vscale x 4 x float> %a) #0 {
+; CHECK-LABEL: 'fadda_nxv4f32
+; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction:   %res = call float @llvm.vector.reduce.fadd.nxv4f32(float %start, <vscale x 4 x float> %a)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction:   ret float %res
+
+  %res = call float @llvm.vector.reduce.fadd.nxv4f32(float %start, <vscale x 4 x float> %a)
+  ret float %res
+}
+
+define double @fadda_nxv4f64(double %start, <vscale x 4 x double> %a) #0 {
+; CHECK-LABEL: 'fadda_nxv4f64
+; CHECK-NEXT: Cost Model: Found an estimated cost of 6 for instruction:   %res = call double @llvm.vector.reduce.fadd.nxv4f64(double %start, <vscale x 4 x double> %a)
+; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction:   ret double %res
+
+  %res = call double @llvm.vector.reduce.fadd.nxv4f64(double %start, <vscale x 4 x double> %a)
+  ret double %res
+}
+
+
+declare i32 @llvm.vector.reduce.add.nxv4i32(<vscale x 4 x i32>)
+declare i32 @llvm.vector.reduce.mul.nxv4i32(<vscale x 4 x i32>)
+declare i32 @llvm.vector.reduce.and.nxv4i32(<vscale x 4 x i32>)
+declare i32 @llvm.vector.reduce.or.nxv4i32(<vscale x 4 x i32>)
+declare i32 @llvm.vector.reduce.xor.nxv4i32(<vscale x 4 x i32>)
+declare float @llvm.vector.reduce.fmax.nxv4f32(<vscale x 4 x float>)
+declare float @llvm.vector.reduce.fmin.nxv4f32(<vscale x 4 x float>)
+declare i32 @llvm.vector.reduce.fmin.nxv4i32(<vscale x 4 x i32>)
+declare i32 @llvm.vector.reduce.umin.nxv4i32(<vscale x 4 x i32>)
+declare i32 @llvm.vector.reduce.umax.nxv4i32(<vscale x 4 x i32>)
+declare i32 @llvm.vector.reduce.smin.nxv4i32(<vscale x 4 x i32>)
+declare i32 @llvm.vector.reduce.smax.nxv4i32(<vscale x 4 x i32>)
+declare float @llvm.vector.reduce.fadd.nxv4f32(float, <vscale x 4 x float>)
+declare i64 @llvm.vector.reduce.add.nxv4i64(<vscale x 4 x i64>)
+declare i64 @llvm.vector.reduce.mul.nxv4i64(<vscale x 4 x i64>)
+declare i64 @llvm.vector.reduce.and.nxv4i64(<vscale x 4 x i64>)
+declare i64 @llvm.vector.reduce.or.nxv4i64(<vscale x 4 x i64>)
+declare i64 @llvm.vector.reduce.xor.nxv4i64(<vscale x 4 x i64>)
+declare double @llvm.vector.reduce.fmax.nxv4f64(<vscale x 4 x double>)
+declare double @llvm.vector.reduce.fmin.nxv4f64(<vscale x 4 x double>)
+declare i64 @llvm.vector.reduce.umin.nxv4i64(<vscale x 4 x i64>)
+declare i64 @llvm.vector.reduce.umax.nxv4i64(<vscale x 4 x i64>)
+declare i64 @llvm.vector.reduce.smin.nxv4i64(<vscale x 4 x i64>)
+declare i64 @llvm.vector.reduce.smax.nxv4i64(<vscale x 4 x i64>)
+declare double @llvm.vector.reduce.fadd.nxv4f64(double, <vscale x 4 x double>)