implementation of sdag support for VP memory intrinsics

[hussainjk]

Summary

Followup to D99355: SDAG support for vector-predicated load/store/gather/scatter.

[simoll]

The existing masked/gather/scatter SDNodes have seen some changes since the VP nodes were basically forked from them. I am not familiar with the indexing in masked load, for example. Maybe some of the RISC-V V folks can chime in whether any of the recent masked-sdnode updates should be applied to the vp nodes too.

llvm/include/llvm/CodeGen/SelectionDAGNodes.h

2384

Since expansion/compression is unsupported I don't think we need the is.*Load/Store functions.

[frasercrmck]

In D105871#2873713, @simoll wrote:

The existing masked/gather/scatter SDNodes have seen some changes since the VP nodes were basically forked from them. I am not familiar with the indexing in masked load, for example. Maybe some of the RISC-V V folks can chime in whether any of the recent masked-sdnode updates should be applied to the vp nodes too.

I feel that it would be best if the SDNodes matched the non-VP ones as closely as possible. RISC-V doesn't have use for ISD::MemIndexedMode but some target may have one. I'm thinking even expanding loads and truncating stores should be an option. The only complexity is having to legalize it, but we can hopefully piggy-back on the logic for non-VP nodes.

[frasercrmck]

This patch also needs to extend SelectionDAGBuilder to custom-build the "mem" nodes from the intrinsics. Otherwise we won't be creating the SDNodes correctly, e.g. there'll be an invalid MachineMemOperand.

[hussainjk]

In D105871#2904152, @frasercrmck wrote:

This patch also needs to extend SelectionDAGBuilder to custom-build the "mem" nodes from the intrinsics. Otherwise we won't be creating the SDNodes correctly, e.g. there'll be an invalid MachineMemOperand.

As far as I can tell, this is being done correctly through SelectionDAGBuilder::visitVectorPredicationIntrinsic. Is this not the case?

[frasercrmck]

In D105871#2909218, @hussainjk wrote:

In D105871#2904152, @frasercrmck wrote:

This patch also needs to extend SelectionDAGBuilder to custom-build the "mem" nodes from the intrinsics. Otherwise we won't be creating the SDNodes correctly, e.g. there'll be an invalid MachineMemOperand.

As far as I can tell, this is being done correctly through SelectionDAGBuilder::visitVectorPredicationIntrinsic. Is this not the case?

No I don't believe that's the case. There's quite a bit that needs to change for these nodes: we need an in/out chain and we need to create a MachineMemOperand.

Yesterday I tried to build on top of this patch to support the VP nodes in RISC-V but quickly hit segfaults in AddNodeIDCustom.

I believe this change in the reference patch shows the kind of think we need.

[hussainjk]

Addressing review comments: updating sdnodes with indexing, expanding, compressing support; bringing in line with load/store sdnodes.

[hussainjk]

Addressing review comments: extending SDBuilder::VisitVectorPredicationIntrinsic.

[frasercrmck]

llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

7359–7474

I think we're missing VP_GATHER and VP_SCATTER here?

[hussainjk]

Addressing reviews: adding some missing cases for predicated gather/scatter.

[frasercrmck]

llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

7385

I don't think you can use PtrOperand to initialize the MachineMemOperand for VP_GATHER because it's not a pointer - it's a vector of pointers.

The regular llvm.masked.gather intrinsic creates a MachinePointerInfo using only the address space.

7427

Same concern about MachinePointerInfo as with VP_GATHER.

[hussainjk]

Addressing review comments.

[frasercrmck]

Sorry that my review feedback is piecemeal. What I'm doing is running the following test (declares omitted for brevity) with RISC-V. I think we want to see "cannot select" errors for each function, but I'm currently only getting that with vp.load and fixed-length vp.gather. The rest assert.

; RUN: llc -mtriple=riscv64 -mattr=+experimental-v -riscv-v-vector-bits-min=128 < %s

define <vscale x 2 x i32> @vp_gather_nxv2i32(<vscale x 2 x i32*> %ptrs, <vscale x 2 x i1> %mask, i32 zeroext %evl) {
  %ld = call <vscale x 2 x i32> @llvm.vp.gather.nxv2i32.p0nxv2i32(<vscale x 2 x i32*> %ptrs, <vscale x 2 x i1> %mask, i32 %evl)
  ret <vscale x 2 x i32> %ld
}

define <4 x i32> @vp_gather_v4i32(<4 x i32*> %ptrs, <4 x i1> %mask, i32 zeroext %evl) {
  %ld = call <4 x i32> @llvm.vp.gather.v4i32.p0v4i32(<4 x i32*> %ptrs, <4 x i1> %mask, i32 %evl)
  ret <4 x i32> %ld
}

define <vscale x 2 x i32> @vp_load_nxv2i32(<vscale x 2 x i32>* %ptr, <vscale x 2 x i1> %mask, i32 zeroext %evl) {
  %ld = call <vscale x 2 x i32> @llvm.vp.load.nxv2i32.p0nxv2i32(<vscale x 2 x i32>* %ptr, <vscale x 2 x i1> %mask, i32 %evl)
  ret <vscale x 2 x i32> %ld
}

define <4 x i32> @vp_load_v4i32(<4 x i32>* %ptr, <4 x i1> %mask, i32 zeroext %evl) {
  %ld = call <4 x i32> @llvm.vp.load.v4i32.p0v4i32(<4 x i32>* %ptr, <4 x i1> %mask, i32 %evl)
  ret <4 x i32> %ld
}

define void @vp_store_nxv2i32(<vscale x 2 x i32> %val, <vscale x 2 x i32>* %ptr, <vscale x 2 x i1> %mask, i32 zeroext %evl) {
  call void @llvm.vp.store.nxv2i32.p0nxv2i32(<vscale x 2 x i32> %val, <vscale x 2 x i32>* %ptr, <vscale x 2 x i1> %mask, i32 %evl)
  ret void
}

define void @vp_store_v4i32(<4 x i32> %val, <4 x i32>* %ptr, <4 x i1> %mask, i32 zeroext %evl) {
  call void @llvm.vp.store.v4i32.p0v4i32(<4 x i32> %val, <4 x i32>* %ptr, <4 x i1> %mask, i32 %evl)
  ret void
}

define void @vp_scatter_v4i32(<4 x i32> %val, <4 x i32*> %ptrs, <4 x i1> %mask, i32 zeroext %evl) {
  call void @llvm.vp.scatter.v4i32.p0v4i32(<4 x i32> %val, <4 x i32*> %ptrs, <4 x i1> %mask, i32 %evl)
  ret void
}

define void @vp_scatter_nxv2i32(<vscale x 2 x i32> %val, <vscale x 2 x i32*> %ptrs, <vscale x 2 x i1> %mask, i32 zeroext %evl) {
  call void @llvm.vp.scatter.nxv2i32.p0nxv2i32(<vscale x 2 x i32> %val, <vscale x 2 x i32*> %ptrs, <vscale x 2 x i1> %mask, i32 %evl)
  ret void
}

llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

7898

This should be getVectorElementCount so it doesn't crash on scalable vectors

7936

getVectorElementCount for scalable vectors.

llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

7375

nit: empty line

7431

This is an out-of-bounds access because vp.store/vp.gather return void and so ValueVTs is empty.

[hussainjk]

Addressing review comments.

[hussainjk]

@simoll @frasercrmck All the mentioned tests are now passing, and I don't think there are any other outstanding issues. Are we good to accept and merge?

[simoll]

The visitVectorPredicationIntrinsic is pretty crammed now. Probably a good idea to extract the SDNode buildling for load/store/scatter/gather into their own functions as done for regular (masked) load/store/gather/scatter.

llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

7395–7416

This is the same code as ..

7443–7464

.. this code. Can we de-duplicate and move this into its own function?

[frasercrmck]

llvm/include/llvm/CodeGen/SelectionDAGNodes.h

2347

nit: inconsistent capitalization, plus VLen is maybe better known at EVL.

Also it doesn't have to be i32. It may be widened to a target-specific value, e.g.,

MVT EVLParamVT = TLI.getVPExplicitVectorLengthTy();

Not sure how best to describe that in the comments.

llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

7596

I think all of these VLen params may be better as EVL since that's how they're known in the rest of the code. Any thoughts, @simoll?

[simoll]

llvm/include/llvm/CodeGen/SelectionDAGNodes.h

2347

Not sure how best to describe that in the comments.

// The type of EVL is TLI.getVPExplicitVectorLengthTy() ?

llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

7596

+1 Let's stick to EVL for consistency.

[hussainjk]

Addressing review comments.

[frasercrmck]

llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

7372

I think this should be Opcode == ISD::VP_SCATTER?

[frasercrmck]

LGTM other than that last issue, I think.

[frasercrmck]

I don't think the commit message title needs to mention the fact it's a "Followup to D99355" - that can be in the body.

[hussainjk]

Addressing review comment.

[hussainjk]

@simoll Do you mind merging this one in as well?

[rogfer01]

llvm/include/llvm/CodeGen/SelectionDAGNodes.h

2352

Sorry for reviving, this (I was working on a patch for strided load store).

Shouldn't this have been ISD::VP_LOAD instead?

[frasercrmck]

llvm/include/llvm/CodeGen/SelectionDAGNodes.h

2352

Oh, good spot! I don't think anyone's using the shared base class (everyone uses the concrete subclasses which have their own getOffset.

Do you want to submit a patch or shall I?

[rogfer01]

llvm/include/llvm/CodeGen/SelectionDAGNodes.h

2352

I created https://reviews.llvm.org/D110930

Thanks for the prompt reply!

llvm/include/llvm/CodeGen/SelectionDAG.h

getTruncStore(SDValue Chain, const SDLoc &dl, SDValue Val, SDValue Ptr,
     return getTruncStore(Chain, dl, Val, Ptr, PtrInfo, SVT,
                          MaybeAlign(Alignment), MMOFlags, AAInfo);
   }
   SDValue getTruncStore(SDValue Chain, const SDLoc &dl, SDValue Val,
                         SDValue Ptr, EVT SVT, MachineMemOperand *MMO);
   SDValue getIndexedStore(SDValue OrigStore, const SDLoc &dl, SDValue Base,
                           SDValue Offset, ISD::MemIndexedMode AM);
 
+  SDValue getLoadVP(ISD::MemIndexedMode AM, ISD::LoadExtType ExtType, EVT VT,
+                    const SDLoc &dl, SDValue Chain, SDValue Ptr, SDValue Offset,
+                    SDValue Mask, SDValue VLen, MachinePointerInfo PtrInfo,
+                    EVT MemVT, Align Alignment,
+                    MachineMemOperand::Flags MMOFlags, const AAMDNodes &AAInfo,
+                    const MDNode *Ranges = nullptr, bool IsExpanding = false);
+  inline SDValue
+  getLoadVP(ISD::MemIndexedMode AM, ISD::LoadExtType ExtType, EVT VT,
+            const SDLoc &dl, SDValue Chain, SDValue Ptr, SDValue Offset,
+            SDValue Mask, SDValue VLen, MachinePointerInfo PtrInfo, EVT MemVT,
+            MaybeAlign Alignment = MaybeAlign(),
+            MachineMemOperand::Flags MMOFlags = MachineMemOperand::MONone,
+            const AAMDNodes &AAInfo = AAMDNodes(),
+            const MDNode *Ranges = nullptr, bool IsExpanding = false) {
+    // Ensures that codegen never sees a None Alignment.
+    return getLoadVP(AM, ExtType, VT, dl, Chain, Ptr, Offset, Mask, VLen,
+                     PtrInfo, MemVT, Alignment.getValueOr(getEVTAlign(MemVT)),
+                     MMOFlags, AAInfo, Ranges, IsExpanding);
+  }
+  SDValue getLoadVP(ISD::MemIndexedMode AM, ISD::LoadExtType ExtType, EVT VT,
+                    const SDLoc &dl, SDValue Chain, SDValue Ptr, SDValue Offset,
+                    SDValue Mask, SDValue VLen, EVT MemVT,
+                    MachineMemOperand *MMO, bool IsExpanding = false);
+  SDValue getLoadVP(EVT VT, const SDLoc &dl, SDValue Chain, SDValue Ptr,
+                    SDValue Mask, SDValue VLen, MachinePointerInfo PtrInfo,
+                    MaybeAlign Alignment, MachineMemOperand::Flags MMOFlags,
+                    const AAMDNodes &AAInfo, const MDNode *Ranges = nullptr,
+                    bool IsExpanding = false);
+  SDValue getLoadVP(EVT VT, const SDLoc &dl, SDValue Chain, SDValue Ptr,
+                    SDValue Mask, SDValue VLen, MachineMemOperand *MMO,
+                    bool IsExpanding = false);
+  SDValue getExtLoadVP(ISD::LoadExtType ExtType, const SDLoc &dl, EVT VT,
+                       SDValue Chain, SDValue Ptr, SDValue Mask, SDValue VLen,
+                       MachinePointerInfo PtrInfo, EVT MemVT,
+                       MaybeAlign Alignment, MachineMemOperand::Flags MMOFlags,
+                       const AAMDNodes &AAInfo, bool IsExpanding = false);
+  SDValue getExtLoadVP(ISD::LoadExtType ExtType, const SDLoc &dl, EVT VT,
+                       SDValue Chain, SDValue Ptr, SDValue Mask, SDValue VLen,
+                       EVT MemVT, MachineMemOperand *MMO,
+                       bool IsExpanding = false);
+  SDValue getIndexedLoadVP(SDValue OrigLoad, const SDLoc &dl, SDValue Base,
+                           SDValue Offset, ISD::MemIndexedMode AM);
+  SDValue getStoreVP(SDValue Chain, const SDLoc &dl, SDValue Val, SDValue Ptr,
+                     SDValue Mask, SDValue VLen, MachinePointerInfo PtrInfo,
+                     Align Alignment, MachineMemOperand::Flags MMOFlags,
+                     const AAMDNodes &AAInfo, bool IsCompressing = false);
+  SDValue getStoreVP(SDValue Chain, const SDLoc &dl, SDValue Val, SDValue Ptr,
+                     SDValue Mask, SDValue VLen, MachineMemOperand *MMO,
+                     bool IsCompressing = false);
+  SDValue getTruncStoreVP(SDValue Chain, const SDLoc &dl, SDValue Val,
+                          SDValue Ptr, SDValue Mask, SDValue VLen,
+                          MachinePointerInfo PtrInfo, EVT SVT, Align Alignment,
+                          MachineMemOperand::Flags MMOFlags,
+                          const AAMDNodes &AAInfo, bool IsCompressing = false);
+  SDValue getTruncStoreVP(SDValue Chain, const SDLoc &dl, SDValue Val,
+                          SDValue Ptr, SDValue Mask, SDValue VLen, EVT SVT,
+                          MachineMemOperand *MMO, bool IsCompressing = false);
+  SDValue getIndexedStoreVP(SDValue OrigStore, const SDLoc &dl, SDValue Base,
+                            SDValue Offset, ISD::MemIndexedMode AM);
+
+  SDValue getGatherVP(SDVTList VTs, EVT VT, const SDLoc &dl,
+                      ArrayRef<SDValue> Ops, MachineMemOperand *MMO,
+                      ISD::MemIndexType IndexType);
+  SDValue getScatterVP(SDVTList VTs, EVT VT, const SDLoc &dl,
+                       ArrayRef<SDValue> Ops, MachineMemOperand *MMO,
+                       ISD::MemIndexType IndexType);
+
   SDValue getMaskedLoad(EVT VT, const SDLoc &dl, SDValue Chain, SDValue Base,
                         SDValue Offset, SDValue Mask, SDValue Src0, EVT MemVT,
                         MachineMemOperand *MMO, ISD::MemIndexedMode AM,
                         ISD::LoadExtType, bool IsExpanding = false);
   SDValue getIndexedMaskedLoad(SDValue OrigLoad, const SDLoc &dl, SDValue Base,
                                SDValue Offset, ISD::MemIndexedMode AM);
   SDValue getMaskedStore(SDValue Chain, const SDLoc &dl, SDValue Val,
                          SDValue Base, SDValue Offset, SDValue Mask, EVT MemVT,

llvm/include/llvm/CodeGen/SelectionDAGNodes.h

class MemSDNodeBitfields {
     uint16_t IsNonTemporal : 1;
     uint16_t IsDereferenceable : 1;
     uint16_t IsInvariant : 1;
   };
   enum { NumMemSDNodeBits = NumSDNodeBits + 4 };
 
   class LSBaseSDNodeBitfields {
     friend class LSBaseSDNode;
+    friend class VPLoadStoreSDNode;
     friend class MaskedLoadStoreSDNode;
     friend class MaskedGatherScatterSDNode;
+    friend class VPGatherScatterSDNode;
 
     uint16_t : NumMemSDNodeBits;
 
     // This storage is shared between disparate class hierarchies to hold an
     // enumeration specific to the class hierarchy in use.
     //   LSBaseSDNode => enum ISD::MemIndexedMode
+    //   VPLoadStoreBaseSDNode => enum ISD::MemIndexedMode
     //   MaskedLoadStoreBaseSDNode => enum ISD::MemIndexedMode
+    //   VPGatherScatterSDNode => enum ISD::MemIndexType
     //   MaskedGatherScatterSDNode => enum ISD::MemIndexType
     uint16_t AddressingMode : 3;
   };
   enum { NumLSBaseSDNodeBits = NumMemSDNodeBits + 3 };
 
   class LoadSDNodeBitfields {
     friend class LoadSDNode;
+    friend class VPLoadSDNode;
     friend class MaskedLoadSDNode;
     friend class MaskedGatherSDNode;
+    friend class VPGatherSDNode;
 
     uint16_t : NumLSBaseSDNodeBits;
 
     uint16_t ExtTy : 2; // enum ISD::LoadExtType
     uint16_t IsExpanding : 1;
   };
 
   class StoreSDNodeBitfields {
     friend class StoreSDNode;
+    friend class VPStoreSDNode;
     friend class MaskedStoreSDNode;
     friend class MaskedScatterSDNode;
+    friend class VPScatterSDNode;
 
     uint16_t : NumLSBaseSDNodeBits;
 
     uint16_t IsTruncating : 1;
     uint16_t IsCompressing : 1;
   };
 
   union {
void refineAlignment(const MachineMemOperand *NewMMO) {
     MMO->refineAlignment(NewMMO);
   }
 
   const SDValue &getChain() const { return getOperand(0); }
 
   const SDValue &getBasePtr() const {
     switch (getOpcode()) {
     case ISD::STORE:
+    case ISD::VP_STORE:
     case ISD::MSTORE:
       return getOperand(2);
     case ISD::MGATHER:
     case ISD::MSCATTER:
+    case ISD::VP_GATHER:
+    case ISD::VP_SCATTER:
       return getOperand(3);
     default:
       return getOperand(1);
     }
   }
 
   // Methods to support isa and dyn_cast
   static bool classof(const SDNode *N) {
static bool classof(const SDNode *N) {
     case ISD::ATOMIC_LOAD_FADD:
     case ISD::ATOMIC_LOAD_FSUB:
     case ISD::ATOMIC_LOAD:
     case ISD::ATOMIC_STORE:
     case ISD::MLOAD:
     case ISD::MSTORE:
     case ISD::MGATHER:
     case ISD::MSCATTER:
+    case ISD::VP_LOAD:
+    case ISD::VP_STORE:
+    case ISD::VP_GATHER:
+    case ISD::VP_SCATTER:
       return true;
     default:
       return N->isMemIntrinsic() || N->isTargetMemoryOpcode();
     }
   }
 };
 
 /// This is an SDNode representing atomic operations.
public:
   const SDValue &getBasePtr() const { return getOperand(2); }
   const SDValue &getOffset() const { return getOperand(3); }
 
   static bool classof(const SDNode *N) {
     return N->getOpcode() == ISD::STORE;
   }
 };
 
+/// This base class is used to represent VP_LOAD and VP_STORE nodes
+class VPLoadStoreSDNode : public MemSDNode {
+public:
+  friend class SelectionDAG;
+
+  VPLoadStoreSDNode(ISD::NodeType NodeTy, unsigned Order, const DebugLoc &dl,
+                    SDVTList VTs, ISD::MemIndexedMode AM, EVT MemVT,
+                    MachineMemOperand *MMO)
+      : MemSDNode(NodeTy, Order, dl, VTs, MemVT, MMO) {
+    LSBaseSDNodeBits.AddressingMode = AM;
+    assert(getAddressingMode() == AM && "Value truncated");
+  }
+
+  // VPLoadSDNode (Chain, ptr, offset, mask, VLen)
+  // VPStoreSDNode (Chain, data, ptr, offset, mask, VLen)
+  // Mask is a vector of i1 elements, Vlen is i32
+  const SDValue &getOffset() const {
+    return getOperand(getOpcode() == ISD::MLOAD ? 2 : 3);
+  }
+  const SDValue &getBasePtr() const {
+    return getOperand(getOpcode() == ISD::VP_LOAD ? 1 : 2);
+  }
+  const SDValue &getMask() const {
+    return getOperand(getOpcode() == ISD::VP_LOAD ? 3 : 4);
+  }
+  const SDValue &getVectorLength() const {
+    return getOperand(getOpcode() == ISD::VP_LOAD ? 4 : 5);
+  }
+
+  /// Return the addressing mode for this load or store:
+  /// unindexed, pre-inc, pre-dec, post-inc, or post-dec.
+  ISD::MemIndexedMode getAddressingMode() const {
+    return static_cast<ISD::MemIndexedMode>(LSBaseSDNodeBits.AddressingMode);
+  }
+
+  /// Return true if this is a pre/post inc/dec load/store.
+  bool isIndexed() const { return getAddressingMode() != ISD::UNINDEXED; }
+
+  /// Return true if this is NOT a pre/post inc/dec load/store.
+  bool isUnindexed() const { return getAddressingMode() == ISD::UNINDEXED; }
+
+  static bool classof(const SDNode *N) {
+    return N->getOpcode() == ISD::VP_LOAD || N->getOpcode() == ISD::VP_STORE;
+  }
+};
+
+/// This class is used to represent a VP_LOAD node
+class VPLoadSDNode : public VPLoadStoreSDNode {
+public:
+  friend class SelectionDAG;
+
+  VPLoadSDNode(unsigned Order, const DebugLoc &dl, SDVTList VTs,
+               ISD::MemIndexedMode AM, ISD::LoadExtType ETy, bool isExpanding,
+               EVT MemVT, MachineMemOperand *MMO)
+      : VPLoadStoreSDNode(ISD::VP_LOAD, Order, dl, VTs, AM, MemVT, MMO) {
+    LoadSDNodeBits.ExtTy = ETy;
+    LoadSDNodeBits.IsExpanding = isExpanding;
+  }
+
+  ISD::LoadExtType getExtensionType() const {
+    return static_cast<ISD::LoadExtType>(LoadSDNodeBits.ExtTy);
+  }
+
+  const SDValue &getBasePtr() const { return getOperand(1); }
+  const SDValue &getOffset() const { return getOperand(2); }
+  const SDValue &getMask() const { return getOperand(3); }
+  const SDValue &getVectorLength() const { return getOperand(4); }
+
+  static bool classof(const SDNode *N) {
+    return N->getOpcode() == ISD::VP_LOAD;
+  }
+  bool isExpandingLoad() const { return LoadSDNodeBits.IsExpanding; }
+};
+
+/// This class is used to represent a VP_STORE node
+class VPStoreSDNode : public VPLoadStoreSDNode {
+public:
+  friend class SelectionDAG;
+
+  VPStoreSDNode(unsigned Order, const DebugLoc &dl, SDVTList VTs,
+                ISD::MemIndexedMode AM, bool isTrunc, bool isCompressing,
+                EVT MemVT, MachineMemOperand *MMO)
+      : VPLoadStoreSDNode(ISD::VP_STORE, Order, dl, VTs, AM, MemVT, MMO) {
+    StoreSDNodeBits.IsTruncating = isTrunc;
+    StoreSDNodeBits.IsCompressing = isCompressing;
+  }
+
+  /// Return true if this is a truncating store.
+  /// For integers this is the same as doing a TRUNCATE and storing the result.
+  /// For floats, it is the same as doing an FP_ROUND and storing the result.
+  bool isTruncatingStore() const { return StoreSDNodeBits.IsTruncating; }
+
+  /// Returns true if the op does a compression to the vector before storing.
+  /// The node contiguously stores the active elements (integers or floats)
+  /// in src (those with their respective bit set in writemask k) to unaligned
+  /// memory at base_addr.
+  bool isCompressingStore() const { return StoreSDNodeBits.IsCompressing; }
+
+  const SDValue &getValue() const { return getOperand(1); }
+  const SDValue &getBasePtr() const { return getOperand(2); }
+  const SDValue &getOffset() const { return getOperand(3); }
+  const SDValue &getMask() const { return getOperand(4); }
+  const SDValue &getVectorLength() const { return getOperand(5); }
+
+  static bool classof(const SDNode *N) {
+    return N->getOpcode() == ISD::VP_STORE;
+  }
+};
+
 /// This base class is used to represent MLOAD and MSTORE nodes
 class MaskedLoadStoreSDNode : public MemSDNode {
 public:
   friend class SelectionDAG;
 
   MaskedLoadStoreSDNode(ISD::NodeType NodeTy, unsigned Order,
                         const DebugLoc &dl, SDVTList VTs,
                         ISD::MemIndexedMode AM, EVT MemVT,
public:
   const SDValue &getMask() const { return getOperand(4); }
 
   static bool classof(const SDNode *N) {
     return N->getOpcode() == ISD::MSTORE;
   }
 };
 
 /// This is a base class used to represent
+/// VP_GATHER and VP_SCATTER nodes
+///
+class VPGatherScatterSDNode : public MemSDNode {
+public:
+  friend class SelectionDAG;
+
+  VPGatherScatterSDNode(ISD::NodeType NodeTy, unsigned Order,
+                        const DebugLoc &dl, SDVTList VTs, EVT MemVT,
+                        MachineMemOperand *MMO, ISD::MemIndexType IndexType)
+      : MemSDNode(NodeTy, Order, dl, VTs, MemVT, MMO) {
+    LSBaseSDNodeBits.AddressingMode = IndexType;
+    assert(getIndexType() == IndexType && "Value truncated");
+  }
+
+  /// How is Index applied to BasePtr when computing addresses.
+  ISD::MemIndexType getIndexType() const {
+    return static_cast<ISD::MemIndexType>(LSBaseSDNodeBits.AddressingMode);
+  }
+  bool isIndexScaled() const {
+    return (getIndexType() == ISD::SIGNED_SCALED) ||
+           (getIndexType() == ISD::UNSIGNED_SCALED);
+  }
+  bool isIndexSigned() const {
+    return (getIndexType() == ISD::SIGNED_SCALED) ||
+           (getIndexType() == ISD::SIGNED_UNSCALED);
+  }
+
+  // In the both nodes address is Op1, mask is Op2:
+  // VPGatherSDNode  (Chain, base, index, scale, mask, vlen)
+  // VPScatterSDNode (Chain, value, base, index, scale, mask, vlen)
+  // Mask is a vector of i1 elements
+  const SDValue &getBasePtr() const {
+    return getOperand((getOpcode() == ISD::VP_GATHER) ? 1 : 2);
+  }
+  const SDValue &getIndex() const {
+    return getOperand((getOpcode() == ISD::VP_GATHER) ? 2 : 3);
+  }
+  const SDValue &getScale() const {
+    return getOperand((getOpcode() == ISD::VP_GATHER) ? 3 : 4);
+  }
+  const SDValue &getMask() const {
+    return getOperand((getOpcode() == ISD::VP_GATHER) ? 4 : 5);
+  }
+  const SDValue &getVectorLength() const {
+    return getOperand((getOpcode() == ISD::VP_GATHER) ? 5 : 6);
+  }
+
+  static bool classof(const SDNode *N) {
+    return N->getOpcode() == ISD::VP_GATHER ||
+           N->getOpcode() == ISD::VP_SCATTER;
+  }
+};
+
+/// This class is used to represent an VP_GATHER node
+///
+class VPGatherSDNode : public VPGatherScatterSDNode {
+public:
+  friend class SelectionDAG;
+
+  VPGatherSDNode(unsigned Order, const DebugLoc &dl, SDVTList VTs, EVT MemVT,
+                 MachineMemOperand *MMO, ISD::MemIndexType IndexType)
+      : VPGatherScatterSDNode(ISD::VP_GATHER, Order, dl, VTs, MemVT, MMO,
+                              IndexType) {}
+
+  static bool classof(const SDNode *N) {
+    return N->getOpcode() == ISD::VP_GATHER;
+  }
+};
+
+/// This class is used to represent an VP_SCATTER node
+///
+class VPScatterSDNode : public VPGatherScatterSDNode {
+public:
+  friend class SelectionDAG;
+
+  VPScatterSDNode(unsigned Order, const DebugLoc &dl, SDVTList VTs, EVT MemVT,
+                  MachineMemOperand *MMO, ISD::MemIndexType IndexType)
+      : VPGatherScatterSDNode(ISD::VP_SCATTER, Order, dl, VTs, MemVT, MMO,
+                              IndexType) {}
+
+  const SDValue &getValue() const { return getOperand(1); }
+
+  static bool classof(const SDNode *N) {
+    return N->getOpcode() == ISD::VP_SCATTER;
+  }
+};
+
+/// This is a base class used to represent
 /// MGATHER and MSCATTER nodes
 ///
 class MaskedGatherScatterSDNode : public MemSDNode {
 public:
   friend class SelectionDAG;
 
   MaskedGatherScatterSDNode(ISD::NodeType NodeTy, unsigned Order,
                             const DebugLoc &dl, SDVTList VTs, EVT MemVT,

llvm/include/llvm/IR/VPIntrinsics.def

 HELPER_REGISTER_BINARY_FP_VP(frem, VP_FREM, FRem)
 
 #undef HELPER_REGISTER_BINARY_FP_VP
 
 ///// } Floating-Point Arithmetic
 
 ///// Memory Operations {
 // llvm.vp.store(ptr,val,mask,vlen)
-BEGIN_REGISTER_VP(vp_store, 2, 3, VP_STORE, 0)
+BEGIN_REGISTER_VP_INTRINSIC(vp_store, 2, 3)
+BEGIN_REGISTER_VP_SDNODE(VP_STORE, 0, vp_store, 3, 4)
 HANDLE_VP_TO_OPC(Store)
 HANDLE_VP_TO_INTRIN(masked_store)
 HANDLE_VP_IS_MEMOP(vp_store, 1, 0)
 END_REGISTER_VP(vp_store, VP_STORE)
 
 // llvm.vp.scatter(ptr,val,mask,vlen)
 BEGIN_REGISTER_VP(vp_scatter, 2, 3, VP_SCATTER, 0)
 HANDLE_VP_TO_INTRIN(masked_scatter)
 HANDLE_VP_IS_MEMOP(vp_scatter, 1, 0)
 END_REGISTER_VP(vp_scatter, VP_SCATTER)
 
 // llvm.vp.load(ptr,mask,vlen)
-BEGIN_REGISTER_VP(vp_load, 1, 2, VP_LOAD, -1)
+BEGIN_REGISTER_VP_INTRINSIC(vp_load, 1, 2)
+BEGIN_REGISTER_VP_SDNODE(VP_LOAD, -1, vp_load, 2, 3)
 HANDLE_VP_TO_OPC(Load)
 HANDLE_VP_TO_INTRIN(masked_load)
 HANDLE_VP_IS_MEMOP(vp_load, 0, None)
 END_REGISTER_VP(vp_load, VP_LOAD)
 
 // llvm.vp.gather(ptr,mask,vlen)
 BEGIN_REGISTER_VP(vp_gather, 1, 2, VP_GATHER, -1)
 HANDLE_VP_TO_INTRIN(masked_gather)

llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

static void AddNodeIDCustom(FoldingSetNodeID &ID, const SDNode *N) {
   }
   case ISD::STORE: {
     const StoreSDNode *ST = cast<StoreSDNode>(N);
     ID.AddInteger(ST->getMemoryVT().getRawBits());
     ID.AddInteger(ST->getRawSubclassData());
     ID.AddInteger(ST->getPointerInfo().getAddrSpace());
     break;
   }
+  case ISD::VP_LOAD: {
+    const VPLoadSDNode *ELD = cast<VPLoadSDNode>(N);
+    ID.AddInteger(ELD->getMemoryVT().getRawBits());
+    ID.AddInteger(ELD->getRawSubclassData());
+    ID.AddInteger(ELD->getPointerInfo().getAddrSpace());
+    break;
+  }
+  case ISD::VP_STORE: {
+    const VPStoreSDNode *EST = cast<VPStoreSDNode>(N);
+    ID.AddInteger(EST->getMemoryVT().getRawBits());
+    ID.AddInteger(EST->getRawSubclassData());
+    ID.AddInteger(EST->getPointerInfo().getAddrSpace());
+    break;
+  }
+  case ISD::VP_GATHER: {
+    const VPGatherSDNode *EG = cast<VPGatherSDNode>(N);
+    ID.AddInteger(EG->getMemoryVT().getRawBits());
+    ID.AddInteger(EG->getRawSubclassData());
+    ID.AddInteger(EG->getPointerInfo().getAddrSpace());
+    break;
+  }
+  case ISD::VP_SCATTER: {
+    const VPScatterSDNode *ES = cast<VPScatterSDNode>(N);
+    ID.AddInteger(ES->getMemoryVT().getRawBits());
+    ID.AddInteger(ES->getRawSubclassData());
+    ID.AddInteger(ES->getPointerInfo().getAddrSpace());
+    break;
+  }
   case ISD::MLOAD: {
     const MaskedLoadSDNode *MLD = cast<MaskedLoadSDNode>(N);
     ID.AddInteger(MLD->getMemoryVT().getRawBits());
     ID.AddInteger(MLD->getRawSubclassData());
     ID.AddInteger(MLD->getPointerInfo().getAddrSpace());
     break;
   }
   case ISD::MSTORE: {
SDValue SelectionDAG::getIndexedStore(SDValue OrigStore, const SDLoc &dl,
 
   CSEMap.InsertNode(N, IP);
   InsertNode(N);
   SDValue V(N, 0);
   NewSDValueDbgMsg(V, "Creating new node: ", this);
   return V;
 }
 
+SDValue SelectionDAG::getLoadVP(
+    ISD::MemIndexedMode AM, ISD::LoadExtType ExtType, EVT VT, const SDLoc &dl,
+    SDValue Chain, SDValue Ptr, SDValue Offset, SDValue Mask, SDValue VLen,
+    MachinePointerInfo PtrInfo, EVT MemVT, Align Alignment,
+    MachineMemOperand::Flags MMOFlags, const AAMDNodes &AAInfo,
+    const MDNode *Ranges, bool IsExpanding) {
+  assert(Chain.getValueType() == MVT::Other && "Invalid chain type");
+
+  MMOFlags |= MachineMemOperand::MOLoad;
+  assert((MMOFlags & MachineMemOperand::MOStore) == 0);
+  // If we don't have a PtrInfo, infer the trivial frame index case to simplify
+  // clients.
+  if (PtrInfo.V.isNull())
+    PtrInfo = InferPointerInfo(PtrInfo, *this, Ptr, Offset);
+
+  uint64_t Size = MemoryLocation::getSizeOrUnknown(MemVT.getStoreSize());
+  MachineFunction &MF = getMachineFunction();
+  MachineMemOperand *MMO = MF.getMachineMemOperand(PtrInfo, MMOFlags, Size,
+                                                   Alignment, AAInfo, Ranges);
+  return getLoadVP(AM, ExtType, VT, dl, Chain, Ptr, Offset, Mask, VLen, MemVT,
+                   MMO, IsExpanding);
+}
+
+SDValue SelectionDAG::getLoadVP(ISD::MemIndexedMode AM,
+                                ISD::LoadExtType ExtType, EVT VT,
+                                const SDLoc &dl, SDValue Chain, SDValue Ptr,
+                                SDValue Offset, SDValue Mask, SDValue VLen,
+                                EVT MemVT, MachineMemOperand *MMO,
+                                bool IsExpanding) {
+  if (VT == MemVT) {
+    ExtType = ISD::NON_EXTLOAD;
+  } else if (ExtType == ISD::NON_EXTLOAD) {
+    assert(VT == MemVT && "Non-extending load from different memory type!");
+  } else {
+    // Extending load.
+    assert(MemVT.getScalarType().bitsLT(VT.getScalarType()) &&
+           "Should only be an extending load, not truncating!");
+    assert(VT.isInteger() == MemVT.isInteger() &&
+           "Cannot convert from FP to Int or Int -> FP!");
+    assert(VT.isVector() == MemVT.isVector() &&
+           "Cannot use an ext load to convert to or from a vector!");
+    assert((!VT.isVector() ||
+            VT.getVectorElementCount() == MemVT.getVectorElementCount()) &&
+           "Cannot use an ext load to change the number of vector elements!");
+  }
+
+  bool Indexed = AM != ISD::UNINDEXED;
+  assert((Indexed || Offset.isUndef()) && "Unindexed load with an offset!");
+
+  SDVTList VTs = Indexed ? getVTList(VT, Ptr.getValueType(), MVT::Other)
+                         : getVTList(VT, MVT::Other);
+  SDValue Ops[] = {Chain, Ptr, Offset, Mask, VLen};
+  FoldingSetNodeID ID;
+  AddNodeIDNode(ID, ISD::VP_LOAD, VTs, Ops);
+  ID.AddInteger(VT.getRawBits());
+  ID.AddInteger(getSyntheticNodeSubclassData<VPLoadSDNode>(
+      dl.getIROrder(), VTs, AM, ExtType, IsExpanding, MemVT, MMO));
+  ID.AddInteger(MMO->getPointerInfo().getAddrSpace());
+  void *IP = nullptr;
+  if (SDNode *E = FindNodeOrInsertPos(ID, dl, IP)) {
+    cast<VPLoadSDNode>(E)->refineAlignment(MMO);
+    return SDValue(E, 0);
+  }
+  auto *N = newSDNode<VPLoadSDNode>(dl.getIROrder(), dl.getDebugLoc(), VTs, AM,
+                                    ExtType, IsExpanding, MemVT, MMO);
+  createOperands(N, Ops);
+
+  CSEMap.InsertNode(N, IP);
+  InsertNode(N);
+  SDValue V(N, 0);
+  NewSDValueDbgMsg(V, "Creating new node: ", this);
+  return V;
+}
+
+SDValue SelectionDAG::getLoadVP(EVT VT, const SDLoc &dl, SDValue Chain,
+                                SDValue Ptr, SDValue Mask, SDValue VLen,
+                                MachinePointerInfo PtrInfo,
+                                MaybeAlign Alignment,
+                                MachineMemOperand::Flags MMOFlags,
+                                const AAMDNodes &AAInfo, const MDNode *Ranges,
+                                bool IsExpanding) {
+  SDValue Undef = getUNDEF(Ptr.getValueType());
+  return getLoadVP(ISD::UNINDEXED, ISD::NON_EXTLOAD, VT, dl, Chain, Ptr, Undef,
+                   Mask, VLen, PtrInfo, VT, Alignment, MMOFlags, AAInfo, Ranges,
+                   IsExpanding);
+}
+
+SDValue SelectionDAG::getLoadVP(EVT VT, const SDLoc &dl, SDValue Chain,
+                                SDValue Ptr, SDValue Mask, SDValue VLen,
+                                MachineMemOperand *MMO, bool IsExpanding) {
+  SDValue Undef = getUNDEF(Ptr.getValueType());
+  return getLoadVP(ISD::UNINDEXED, ISD::NON_EXTLOAD, VT, dl, Chain, Ptr, Undef,
+                   Mask, VLen, VT, MMO, IsExpanding);
+}
+
+SDValue SelectionDAG::getExtLoadVP(ISD::LoadExtType ExtType, const SDLoc &dl,
+                                   EVT VT, SDValue Chain, SDValue Ptr,
+                                   SDValue Mask, SDValue VLen,
+                                   MachinePointerInfo PtrInfo, EVT MemVT,
+                                   MaybeAlign Alignment,
+                                   MachineMemOperand::Flags MMOFlags,
+                                   const AAMDNodes &AAInfo, bool IsExpanding) {
+  SDValue Undef = getUNDEF(Ptr.getValueType());
+  return getLoadVP(ISD::UNINDEXED, ExtType, VT, dl, Chain, Ptr, Undef, Mask,
+                   VLen, PtrInfo, MemVT, Alignment, MMOFlags, AAInfo, nullptr,
+                   IsExpanding);
+}
+
+SDValue SelectionDAG::getExtLoadVP(ISD::LoadExtType ExtType, const SDLoc &dl,
+                                   EVT VT, SDValue Chain, SDValue Ptr,
+                                   SDValue Mask, SDValue VLen, EVT MemVT,
+                                   MachineMemOperand *MMO, bool IsExpanding) {
+  SDValue Undef = getUNDEF(Ptr.getValueType());
+  return getLoadVP(ISD::UNINDEXED, ExtType, VT, dl, Chain, Ptr, Undef, Mask,
+                   VLen, MemVT, MMO, IsExpanding);
+}
+
+SDValue SelectionDAG::getIndexedLoadVP(SDValue OrigLoad, const SDLoc &dl,
+                                       SDValue Base, SDValue Offset,
+                                       ISD::MemIndexedMode AM) {
+  auto *LD = cast<VPLoadSDNode>(OrigLoad);
+  assert(LD->getOffset().isUndef() && "Load is already a indexed load!");
+  // Don't propagate the invariant or dereferenceable flags.
+  auto MMOFlags =
+      LD->getMemOperand()->getFlags() &
+      ~(MachineMemOperand::MOInvariant | MachineMemOperand::MODereferenceable);
+  return getLoadVP(AM, LD->getExtensionType(), OrigLoad.getValueType(), dl,
+                   LD->getChain(), Base, Offset, LD->getMask(),
+                   LD->getVectorLength(), LD->getPointerInfo(),
+                   LD->getMemoryVT(), LD->getAlign(), MMOFlags, LD->getAAInfo(),
+                   nullptr, LD->isExpandingLoad());
+}
+
+SDValue SelectionDAG::getStoreVP(SDValue Chain, const SDLoc &dl, SDValue Val,
+                                 SDValue Ptr, SDValue Mask, SDValue VLen,
+                                 MachinePointerInfo PtrInfo, Align Alignment,
+                                 MachineMemOperand::Flags MMOFlags,
+                                 const AAMDNodes &AAInfo, bool IsCompressing) {
+  assert(Chain.getValueType() == MVT::Other && "Invalid chain type");
+
+  MMOFlags |= MachineMemOperand::MOStore;
+  assert((MMOFlags & MachineMemOperand::MOLoad) == 0);
+
+  if (PtrInfo.V.isNull())
+    PtrInfo = InferPointerInfo(PtrInfo, *this, Ptr);
+
+  MachineFunction &MF = getMachineFunction();
+  uint64_t Size =
+      MemoryLocation::getSizeOrUnknown(Val.getValueType().getStoreSize());
+  MachineMemOperand *MMO =
+      MF.getMachineMemOperand(PtrInfo, MMOFlags, Size, Alignment, AAInfo);
+  return getStoreVP(Chain, dl, Val, Ptr, Mask, VLen, MMO, IsCompressing);
+}
+
+SDValue SelectionDAG::getStoreVP(SDValue Chain, const SDLoc &dl, SDValue Val,
+                                 SDValue Ptr, SDValue Mask, SDValue VLen,
+                                 MachineMemOperand *MMO, bool IsCompressing) {
+  assert(Chain.getValueType() == MVT::Other && "Invalid chain type");
+  EVT VT = Val.getValueType();
+  SDVTList VTs = getVTList(MVT::Other);
+  SDValue Undef = getUNDEF(Ptr.getValueType());
+  SDValue Ops[] = {Chain, Val, Ptr, Undef, Mask, VLen};
+  FoldingSetNodeID ID;
+  AddNodeIDNode(ID, ISD::VP_STORE, VTs, Ops);
+  ID.AddInteger(VT.getRawBits());
+  ID.AddInteger(getSyntheticNodeSubclassData<VPStoreSDNode>(
+      dl.getIROrder(), VTs, ISD::UNINDEXED, false, IsCompressing, VT, MMO));
+  ID.AddInteger(MMO->getPointerInfo().getAddrSpace());
+  void *IP = nullptr;
+  if (SDNode *E = FindNodeOrInsertPos(ID, dl, IP)) {
+    cast<VPStoreSDNode>(E)->refineAlignment(MMO);
+    return SDValue(E, 0);
+  }
+  auto *N =
+      newSDNode<VPStoreSDNode>(dl.getIROrder(), dl.getDebugLoc(), VTs,
+                               ISD::UNINDEXED, false, IsCompressing, VT, MMO);
+  createOperands(N, Ops);
+
+  CSEMap.InsertNode(N, IP);
+  InsertNode(N);
+  SDValue V(N, 0);
+  NewSDValueDbgMsg(V, "Creating new node: ", this);
+  return V;
+}
+
+SDValue SelectionDAG::getTruncStoreVP(SDValue Chain, const SDLoc &dl,
+                                      SDValue Val, SDValue Ptr, SDValue Mask,
+                                      SDValue VLen, MachinePointerInfo PtrInfo,
+                                      EVT SVT, Align Alignment,
+                                      MachineMemOperand::Flags MMOFlags,
+                                      const AAMDNodes &AAInfo,
+                                      bool IsCompressing) {
+  assert(Chain.getValueType() == MVT::Other && "Invalid chain type");
+
+  MMOFlags |= MachineMemOperand::MOStore;
+  assert((MMOFlags & MachineMemOperand::MOLoad) == 0);
+
+  if (PtrInfo.V.isNull())
+    PtrInfo = InferPointerInfo(PtrInfo, *this, Ptr);
+
+  MachineFunction &MF = getMachineFunction();
+  MachineMemOperand *MMO = MF.getMachineMemOperand(
+      PtrInfo, MMOFlags, MemoryLocation::getSizeOrUnknown(SVT.getStoreSize()),
+      Alignment, AAInfo);
+  return getTruncStoreVP(Chain, dl, Val, Ptr, Mask, VLen, SVT, MMO,
+                         IsCompressing);
+}
+
+SDValue SelectionDAG::getTruncStoreVP(SDValue Chain, const SDLoc &dl,
+                                      SDValue Val, SDValue Ptr, SDValue Mask,
+                                      SDValue VLen, EVT SVT,
+                                      MachineMemOperand *MMO,
+                                      bool IsCompressing) {
+  EVT VT = Val.getValueType();
+
+  assert(Chain.getValueType() == MVT::Other && "Invalid chain type");
+  if (VT == SVT)
+    return getStoreVP(Chain, dl, Val, Ptr, Mask, VLen, MMO, IsCompressing);
+
+  assert(SVT.getScalarType().bitsLT(VT.getScalarType()) &&
+         "Should only be a truncating store, not extending!");
+  assert(VT.isInteger() == SVT.isInteger() && "Can't do FP-INT conversion!");
+  assert(VT.isVector() == SVT.isVector() &&
+         "Cannot use trunc store to convert to or from a vector!");
+  assert((!VT.isVector() ||
+          VT.getVectorElementCount() == SVT.getVectorElementCount()) &&
+         "Cannot use trunc store to change the number of vector elements!");
+
+  SDVTList VTs = getVTList(MVT::Other);
+  SDValue Undef = getUNDEF(Ptr.getValueType());
+  SDValue Ops[] = {Chain, Val, Ptr, Undef, Mask, VLen};
+  FoldingSetNodeID ID;
+  AddNodeIDNode(ID, ISD::VP_STORE, VTs, Ops);
+  ID.AddInteger(SVT.getRawBits());
+  ID.AddInteger(getSyntheticNodeSubclassData<VPStoreSDNode>(
+      dl.getIROrder(), VTs, ISD::UNINDEXED, true, IsCompressing, SVT, MMO));
+  ID.AddInteger(MMO->getPointerInfo().getAddrSpace());
+  void *IP = nullptr;
+  if (SDNode *E = FindNodeOrInsertPos(ID, dl, IP)) {
+    cast<VPStoreSDNode>(E)->refineAlignment(MMO);
+    return SDValue(E, 0);
+  }
+  auto *N =
+      newSDNode<VPStoreSDNode>(dl.getIROrder(), dl.getDebugLoc(), VTs,
+                               ISD::UNINDEXED, true, IsCompressing, SVT, MMO);
+  createOperands(N, Ops);
+
+  CSEMap.InsertNode(N, IP);
+  InsertNode(N);
+  SDValue V(N, 0);
+  NewSDValueDbgMsg(V, "Creating new node: ", this);
+  return V;
+}
+
+SDValue SelectionDAG::getIndexedStoreVP(SDValue OrigStore, const SDLoc &dl,
+                                        SDValue Base, SDValue Offset,
+                                        ISD::MemIndexedMode AM) {
+  auto *ST = cast<VPStoreSDNode>(OrigStore);
+  assert(ST->getOffset().isUndef() && "Store is already an indexed store!");
+  SDVTList VTs = getVTList(Base.getValueType(), MVT::Other);
+  SDValue Ops[] = {ST->getChain(), ST->getValue(), Base,
+                   Offset,         ST->getMask(),  ST->getVectorLength()};
+  FoldingSetNodeID ID;
+  AddNodeIDNode(ID, ISD::VP_STORE, VTs, Ops);
+  ID.AddInteger(ST->getMemoryVT().getRawBits());
+  ID.AddInteger(ST->getRawSubclassData());
+  ID.AddInteger(ST->getPointerInfo().getAddrSpace());
+  void *IP = nullptr;
+  if (SDNode *E = FindNodeOrInsertPos(ID, dl, IP))
+    return SDValue(E, 0);
+
+  auto *N = newSDNode<VPStoreSDNode>(
+      dl.getIROrder(), dl.getDebugLoc(), VTs, AM, ST->isTruncatingStore(),
+      ST->isCompressingStore(), ST->getMemoryVT(), ST->getMemOperand());
+  createOperands(N, Ops);
+
+  CSEMap.InsertNode(N, IP);
+  InsertNode(N);
+  SDValue V(N, 0);
+  NewSDValueDbgMsg(V, "Creating new node: ", this);
+  return V;
+}
+
+SDValue SelectionDAG::getGatherVP(SDVTList VTs, EVT VT, const SDLoc &dl,
+                                  ArrayRef<SDValue> Ops, MachineMemOperand *MMO,
+                                  ISD::MemIndexType IndexType) {
+  assert(Ops.size() == 6 && "Incompatible number of operands");
+
+  FoldingSetNodeID ID;
+  AddNodeIDNode(ID, ISD::VP_GATHER, VTs, Ops);
+  ID.AddInteger(VT.getRawBits());
+  ID.AddInteger(getSyntheticNodeSubclassData<VPGatherSDNode>(
+      dl.getIROrder(), VTs, VT, MMO, IndexType));
+  ID.AddInteger(MMO->getPointerInfo().getAddrSpace());
+  void *IP = nullptr;
+  if (SDNode *E = FindNodeOrInsertPos(ID, dl, IP)) {
+    cast<VPGatherSDNode>(E)->refineAlignment(MMO);
+    return SDValue(E, 0);
+  }
+
+  auto *N = newSDNode<VPGatherSDNode>(dl.getIROrder(), dl.getDebugLoc(), VTs,
+                                      VT, MMO, IndexType);
+  createOperands(N, Ops);
+
+  assert(N->getMask().getValueType().getVectorElementCount() ==
+             N->getValueType(0).getVectorElementCount() &&
+         "Vector width mismatch between mask and data");
+  assert(N->getIndex().getValueType().getVectorElementCount().isScalable() ==
+             N->getValueType(0).getVectorElementCount().isScalable() &&
+         "Scalable flags of index and data do not match");
+  assert(ElementCount::isKnownGE(
+             N->getIndex().getValueType().getVectorElementCount(),
+             N->getValueType(0).getVectorElementCount()) &&
+         "Vector width mismatch between index and data");
+  assert(isa<ConstantSDNode>(N->getScale()) &&
+         cast<ConstantSDNode>(N->getScale())->getAPIntValue().isPowerOf2() &&
+         "Scale should be a constant power of 2");
+
+  CSEMap.InsertNode(N, IP);
+  InsertNode(N);
+  SDValue V(N, 0);
+  NewSDValueDbgMsg(V, "Creating new node: ", this);
+  return V;
+}
+
+SDValue SelectionDAG::getScatterVP(SDVTList VTs, EVT VT, const SDLoc &dl,
+                                   ArrayRef<SDValue> Ops,
+                                   MachineMemOperand *MMO,
+                                   ISD::MemIndexType IndexType) {
+  assert(Ops.size() == 7 && "Incompatible number of operands");
+
+  FoldingSetNodeID ID;
+  AddNodeIDNode(ID, ISD::VP_SCATTER, VTs, Ops);
+  ID.AddInteger(VT.getRawBits());
+  ID.AddInteger(getSyntheticNodeSubclassData<VPScatterSDNode>(
+      dl.getIROrder(), VTs, VT, MMO, IndexType));
+  ID.AddInteger(MMO->getPointerInfo().getAddrSpace());
+  void *IP = nullptr;
+  if (SDNode *E = FindNodeOrInsertPos(ID, dl, IP)) {
+    cast<VPScatterSDNode>(E)->refineAlignment(MMO);
+    return SDValue(E, 0);
+  }
+  auto *N = newSDNode<VPScatterSDNode>(dl.getIROrder(), dl.getDebugLoc(), VTs,
+                                       VT, MMO, IndexType);
+  createOperands(N, Ops);
+
+  assert(N->getMask().getValueType().getVectorElementCount() ==
+             N->getValue().getValueType().getVectorElementCount() &&
+         "Vector width mismatch between mask and data");
+  assert(
+      N->getIndex().getValueType().getVectorElementCount().isScalable() ==
+          N->getValue().getValueType().getVectorElementCount().isScalable() &&
+      "Scalable flags of index and data do not match");
+  assert(ElementCount::isKnownGE(
+             N->getIndex().getValueType().getVectorElementCount(),
+             N->getValue().getValueType().getVectorElementCount()) &&
+         "Vector width mismatch between index and data");
+  assert(isa<ConstantSDNode>(N->getScale()) &&
+         cast<ConstantSDNode>(N->getScale())->getAPIntValue().isPowerOf2() &&
+         "Scale should be a constant power of 2");
+
+  CSEMap.InsertNode(N, IP);
+  InsertNode(N);
+  SDValue V(N, 0);
+  NewSDValueDbgMsg(V, "Creating new node: ", this);
+  return V;
+}
+
 SDValue SelectionDAG::getMaskedLoad(EVT VT, const SDLoc &dl, SDValue Chain,
                                     SDValue Base, SDValue Offset, SDValue Mask,
                                     SDValue PassThru, EVT MemVT,
                                     MachineMemOperand *MMO,
                                     ISD::MemIndexedMode AM,
                                     ISD::LoadExtType ExtTy, bool isExpanding) {
   bool Indexed = AM != ISD::UNINDEXED;
   assert((Indexed || Offset.isUndef()) &&

llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

void SelectionDAGBuilder::visitVectorPredicationIntrinsic(
   SmallVector<SDValue, 7> OpValues;
   for (unsigned I = 0; I < VPIntrin.getNumArgOperands(); ++I) {
     auto Op = getValue(VPIntrin.getArgOperand(I));
     if (I == EVLParamPos)
       Op = DAG.getNode(ISD::ZERO_EXTEND, DL, EVLParamVT, Op);
     OpValues.push_back(Op);
   }
 
+  switch (Opcode) {
+  default: {
     SDValue Result = DAG.getNode(Opcode, DL, VTs, OpValues);
     setValue(&VPIntrin, Result);
+    break;
+  }
+  case ISD::VP_LOAD:
+  case ISD::VP_GATHER: {
+    Value *PtrOperand = VPIntrin.getArgOperand(0);
+    EVT VT = ValueVTs[0];
+    MaybeAlign Alignment = DAG.getEVTAlign(VT);
+    AAMDNodes AAInfo;
+    VPIntrin.getAAMetadata(AAInfo);
+    const MDNode *Ranges = VPIntrin.getMetadata(LLVMContext::MD_range);
+    SDValue LD;
+    bool AddToChain = true;
+    if (Opcode == ISD::VP_LOAD) {
+      // Do not serialize variable-length loads of constant memory with
+      // anything.
+      MemoryLocation ML;
+      if (VT.isScalableVector())
+        ML = MemoryLocation::getAfter(PtrOperand);
+      else
+        ML = MemoryLocation(
+            PtrOperand,
+            LocationSize::precise(
+                DAG.getDataLayout().getTypeStoreSize(VPIntrin.getType())),
+            AAInfo);
+      AddToChain = !AA || !AA->pointsToConstantMemory(ML);
+      SDValue InChain = AddToChain ? DAG.getRoot() : DAG.getEntryNode();
+      MachineMemOperand *MMO = DAG.getMachineFunction().getMachineMemOperand(
+          MachinePointerInfo(PtrOperand), MachineMemOperand::MOLoad,
+          VT.getStoreSize().getKnownMinSize(), *Alignment, AAInfo, Ranges);
+      LD = DAG.getLoadVP(VT, DL, InChain, OpValues[0], OpValues[1], OpValues[2],
+                         MMO, false /*IsExpanding */);
+    } else {
+      unsigned AS =
+          PtrOperand->getType()->getScalarType()->getPointerAddressSpace();
+      MachineMemOperand *MMO = DAG.getMachineFunction().getMachineMemOperand(
+          MachinePointerInfo(AS), MachineMemOperand::MOLoad,
+          MemoryLocation::UnknownSize, *Alignment, AAInfo, Ranges);
+      SDValue Base, Index, Scale;
+      ISD::MemIndexType IndexType;
+      bool UniformBase = getUniformBase(PtrOperand, Base, Index, IndexType,
+                                        Scale, this, VPIntrin.getParent());
+      if (!UniformBase) {
+        Base = DAG.getConstant(0, DL, TLI.getPointerTy(DAG.getDataLayout()));
+        Index = getValue(PtrOperand);
+        IndexType = ISD::SIGNED_UNSCALED;
+        Scale =
+            DAG.getTargetConstant(1, DL, TLI.getPointerTy(DAG.getDataLayout()));
+      }
+      EVT IdxVT = Index.getValueType();
+      EVT EltTy = IdxVT.getVectorElementType();
+      if (TLI.shouldExtendGSIndex(IdxVT, EltTy)) {
+        EVT NewIdxVT = IdxVT.changeVectorElementType(EltTy);
+        Index = DAG.getNode(ISD::SIGN_EXTEND, DL, NewIdxVT, Index);
+      }
+      LD = DAG.getGatherVP(
+          DAG.getVTList(VT, MVT::Other), VT, DL,
+          {DAG.getRoot(), Base, Index, Scale, OpValues[1], OpValues[2]}, MMO,
+          IndexType);
+    }
+    if (AddToChain)
+      PendingLoads.push_back(LD.getValue(1));
+    setValue(&VPIntrin, LD);
+    break;
+  }
+  case ISD::VP_STORE:
+  case ISD::VP_SCATTER: {
+    Value *PtrOperand = VPIntrin.getArgOperand(1);
+    EVT VT = OpValues[0].getValueType();
+    MaybeAlign Alignment = DAG.getEVTAlign(VT);
+    AAMDNodes AAInfo;
+    VPIntrin.getAAMetadata(AAInfo);
+    SDValue ST;
+    if (Opcode == ISD::VP_STORE) {
+      MachineMemOperand *MMO = DAG.getMachineFunction().getMachineMemOperand(
+          MachinePointerInfo(PtrOperand), MachineMemOperand::MOStore,
+          VT.getStoreSize().getKnownMinSize(), *Alignment, AAInfo);
+      ST = DAG.getStoreVP(getMemoryRoot(), DL, OpValues[0], OpValues[1],
+                          OpValues[2], OpValues[3], MMO,
+                          false /* IsTruncating */);
+    } else {
+      unsigned AS =
+          PtrOperand->getType()->getScalarType()->getPointerAddressSpace();
+      MachineMemOperand *MMO = DAG.getMachineFunction().getMachineMemOperand(
+          MachinePointerInfo(AS), MachineMemOperand::MOStore,
+          MemoryLocation::UnknownSize, *Alignment, AAInfo);
+      SDValue Base, Index, Scale;
+      ISD::MemIndexType IndexType;
+      bool UniformBase = getUniformBase(PtrOperand, Base, Index, IndexType,
+                                        Scale, this, VPIntrin.getParent());
+      if (!UniformBase) {
+        Base = DAG.getConstant(0, DL, TLI.getPointerTy(DAG.getDataLayout()));
+        Index = getValue(PtrOperand);
+        IndexType = ISD::SIGNED_UNSCALED;
+        Scale =
+            DAG.getTargetConstant(1, DL, TLI.getPointerTy(DAG.getDataLayout()));
+      }
+      EVT IdxVT = Index.getValueType();
+      EVT EltTy = IdxVT.getVectorElementType();
+      if (TLI.shouldExtendGSIndex(IdxVT, EltTy)) {
+        EVT NewIdxVT = IdxVT.changeVectorElementType(EltTy);
+        Index = DAG.getNode(ISD::SIGN_EXTEND, DL, NewIdxVT, Index);
+      }
+      ST = DAG.getScatterVP(DAG.getVTList(MVT::Other), VT, DL,
+                            {getMemoryRoot(), OpValues[0], Base, Index, Scale,
+                             OpValues[2], OpValues[3]},
+                            MMO, IndexType);
+    }
+    DAG.setRoot(ST);
+    setValue(&VPIntrin, ST);
+    break;
+  }
+  }
 }
 
 SDValue SelectionDAGBuilder::lowerStartEH(SDValue Chain,
                                           const BasicBlock *EHPadBB,
                                           MCSymbol *&BeginLabel) {
   MachineFunction &MF = DAG.getMachineFunction();
   MachineModuleInfo &MMI = MF.getMMI();