[AArch64][SVE] Add intrinsics for non-temporal scatters/gathers

[andwar]

Summary

[AArch64][SVE] Add intrinsics for non-temporal scatters/gathers

This patch adds the following intrinsics for non-temporal gather loads
and scatter stores:

• aarch64_sve_ldnt1_gather_index
• aarch64_sve_stnt1_scatter_index

These intrinsics implement the "scalar + vector of indices" addressing
mode.

As opposed to regular and first-faulting gathers/scatters, there's no
instruction that would take indices and then scale them. Instead, the
indices for non-temporal gathers/scatters are scaled before the
intrinsics are lowered to ldnt1 instructions.

The new ISD nodes, GLDNT1_INDEX and SSTNT1_INDEX, are only used as
placeholders so that we can easily identify the cases implemented in
this patch in performGatherLoadCombine and performScatterStoreCombined.
Once encountered, they are replaced with:

• GLDNT1_INDEX -> SPLAT_VECTOR + SHL + GLDNT1
• SSTNT1_INDEX -> SPLAT_VECTOR + SHL + SSTNT1

The patterns for lowering ISD::SHL for scalable vectors (required by
this patch) were missing, so these are added too.

[andwar]

llvm/lib/Target/AArch64/AArch64ISelLowering.h

266

The new nodes (GLDNT1_INDEX and SSTN1_INDEX) are only introduced to keep performGatherLoadCombine and performScatterStoreCombine relatively clean.

But maybe I shouldn't introduce them if they're always meant to be replaced with SPLAT_VECTOR + MUL + GLDNT1?

[andwar]

Just a quick note: this patch is formatted consistently with the files that it touches. Since these files diverge from the official clang-format rules, clang-format pre-merge checks failed.

[efriedma]

If I'm following correctly, you don't actually create any SSTNT1_INDEX nodes? You're just using it as a placeholder in the call to performScatterStoreCombine? I guess that's not a big deal.

llvm/test/CodeGen/AArch64/sve2-intrinsics-nt-gather-loads-64bit-scaled-offset.ll

13

"mul"? Can we make a shift instead?

[andwar]

In D75601#1906202, @efriedma wrote:

If I'm following correctly, you don't actually create any SSTNT1_INDEX nodes? You're just using it as a placeholder in the call to performScatterStoreCombine? I guess that's not a big deal.

Correct. Same for LDNT1_INDEX. I'm only using these nodes to uniquely identify scatters/gathers that:

• are non-temporal
• use the "scalar + vector of indices" addressing mode.

It's not great, but I think it's the least intrusive way of identifying these cases.

llvm/test/CodeGen/AArch64/sve2-intrinsics-nt-gather-loads-64bit-scaled-offset.ll

13

Sadly there are no patterns for lsl yet, so I'd have to add a call to @llvm.aarch64.sve.lsl for this to wok. It's an option, but I'd prefer to leave a TODO instead (e.g. // TODO Replace MUL with SHL once patterns for lsl are added).

[efriedma]

llvm/test/CodeGen/AArch64/sve2-intrinsics-nt-gather-loads-64bit-scaled-offset.ll

13

The lsl patterns are pretty simple; see https://reviews.llvm.org/D73602 . But sure, we can leave that for later.

[andwar]

• Replaced ISD::MUL from my original patch with ISD::SHL
• Added patterns for ISD::SHL for scalable types
• Extracted the scaling into a seperate function

[andwar]

llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

5265

This change is needed to accommodate for scalable types.

llvm/test/CodeGen/AArch64/sve2-intrinsics-nt-gather-loads-64bit-scaled-offset.ll

13

Fair point, updated.

Btw, thanks for the link, but it seems unrelated. Did you have some other patch in mind?

[andwar]

Fix formatting to appease Harbormaster.

[sdesmalen]

Maybe you can avoid the need for SSTNT1_INDEX and GLDNT1_INDEX by refactoring the performScatterStoreCombine/performGatherLoadCombine to take the parameters from the caller, rather than handling the special cases inside that function.
I don't think that should hold off this patch though, but maybe something to refactor afterwards.

llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp

3085

Can you also create some negative tests for this change?

llvm/lib/Target/AArch64/AArch64ISelLowering.cpp

12674

getScaledOffsetForLDNT1 is a bit of misnomer in this function, how about getScaledOffsetForBitwidth()?

[andwar]

Rename getScaledOffsetForLDNT1 as getScaledOffsetForBitwidth

[andwar]

llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp

3085

If that's OK, I'll do it in a separate patch.

[sdesmalen]

LGTM

llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp

3085

Okay, that's fine with me. I guess this requires adding more patterns for shifts in order to test it, so it makes sense to do that in a separate patch.

llvm/include/llvm/IR/IntrinsicsAArch64.td

 
 //
 // Non-temporal gather loads: scalar base + vector offsets
 //
 
 // 64 bit unscaled offsets
 def int_aarch64_sve_ldnt1_gather : AdvSIMD_GatherLoad_SV_64b_Offsets_Intrinsic;
 
+// 64 bit indices
+def int_aarch64_sve_ldnt1_gather_index : AdvSIMD_GatherLoad_SV_64b_Offsets_Intrinsic;
+
 // 32 bit unscaled offsets, zero (zxtw) extended to 64 bits
 def int_aarch64_sve_ldnt1_gather_uxtw : AdvSIMD_GatherLoad_SV_32b_Offsets_Intrinsic;
 
 //
 // Non-temporal gather loads: vector base + scalar offset
 //
 
 def int_aarch64_sve_ldnt1_gather_scalar_offset  : AdvSIMD_GatherLoad_VS_Intrinsic;

 
 //
 // Non-temporal scatter stores: scalar base + vector offsets
 //
 
 // 64 bit unscaled offsets
 def int_aarch64_sve_stnt1_scatter : AdvSIMD_ScatterStore_SV_64b_Offsets_Intrinsic;
 
+// 64 bit indices
+def int_aarch64_sve_stnt1_scatter_index
+    : AdvSIMD_ScatterStore_SV_64b_Offsets_Intrinsic;
+
 // 32 bit unscaled offsets, zero (zxtw) extended to 64 bits
 def int_aarch64_sve_stnt1_scatter_uxtw : AdvSIMD_ScatterStore_SV_32b_Offsets_Intrinsic;
 
 //
 // Non-temporal scatter stores: vector base + scalar offset
 //
 
 def int_aarch64_sve_stnt1_scatter_scalar_offset  : AdvSIMD_ScatterStore_VS_Intrinsic;

llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

case ISD::ROTR:
     assert(VT.isInteger() && N2.getValueType().isInteger() &&
            "Shifts only work on integers");
     assert((!VT.isVector() || VT == N2.getValueType()) &&
            "Vector shift amounts must be in the same as their first arg");
     // Verify that the shift amount VT is big enough to hold valid shift
     // amounts.  This catches things like trying to shift an i1024 value by an
     // i8, which is easy to fall into in generic code that uses
     // TLI.getShiftAmount().
-    assert(N2.getValueSizeInBits() >= Log2_32_Ceil(N1.getValueSizeInBits()) &&
-           "Invalid use of small shift amount with oversized value!");
+    assert(N2.getValueType().getScalarSizeInBits().getFixedSize() >=
+       Log2_32_Ceil(VT.getScalarSizeInBits().getFixedSize()) &&
 
     // Always fold shifts of i1 values so the code generator doesn't need to
     // handle them.  Since we know the size of the shift has to be less than the
     // size of the value, the shift/rotate count is guaranteed to be zero.
     if (VT == MVT::i1)
       return N1;
     if (N2C && N2C->isNullValue())
       return N1;

llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp

bool SelectSVEAddSubImm(SDValue N, SDValue &Imm, SDValue &Shift) {
     return SelectSVEAddSubImm(N, VT, Imm, Shift);
   }
 
   template<MVT::SimpleValueType VT>
   bool SelectSVELogicalImm(SDValue N, SDValue &Imm) {
     return SelectSVELogicalImm(N, VT, Imm);
   }
 
+  template<unsigned Low, unsigned High>
+  bool SelectSVEShiftImm64(SDValue N, SDValue &Imm) {
+    return SelectSVEShiftImm64(N, Low, High, Imm);
+  }
+
   // Returns a suitable CNT/INC/DEC/RDVL multiplier to calculate VSCALE*N.
   template<signed Min, signed Max, signed Scale, bool Shift>
   bool SelectCntImm(SDValue N, SDValue &Imm) {
     if (!isa<ConstantSDNode>(N))
       return false;
 
     int64_t MulImm = cast<ConstantSDNode>(N)->getSExtValue();
     if (Shift)
private:
 
   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);
 
   bool SelectSVESignedArithImm(SDValue N, SDValue &Imm);
+  bool SelectSVEShiftImm64(SDValue N, uint64_t Low, uint64_t High,
+                           SDValue &Imm);
 
   bool SelectSVEArithImm(SDValue N, SDValue &Imm);
   bool SelectSVERegRegAddrMode(SDValue N, unsigned Scale, SDValue &Base,
                                SDValue &Offset);
 };
 } // end anonymous namespace
 
 /// isIntImmediate - This method tests to see if the node is a constant
if (auto CNode = dyn_cast<ConstantSDNode>(N)) {
     if (AArch64_AM::processLogicalImmediate(ImmVal, 64, encoding)) {
       Imm = CurDAG->getTargetConstant(encoding, DL, MVT::i64);
       return true;
     }
   }
   return false;
 }
 
+// This method is only needed to "cast" i64s into i32s when the value
+// is a valid shift which has been splatted into a vector with i64 elements.
+// Every other type is fine in tablegen.
+bool AArch64DAGToDAGISel::SelectSVEShiftImm64(SDValue N, uint64_t Low,
+                                              uint64_t High, SDValue &Imm) {
+  if (auto *CN = dyn_cast<ConstantSDNode>(N)) {
+    uint64_t ImmVal = CN->getZExtValue();
+    SDLoc DL(N);
+
+    if (ImmVal >= Low && ImmVal <= High) {
+      Imm = CurDAG->getTargetConstant(ImmVal, DL, MVT::i32);
+      return true;
+    }
+  }
+
+  return false;
+}
+
 bool AArch64DAGToDAGISel::trySelectStackSlotTagP(SDNode *N) {
   // tagp(FrameIndex, IRGstack, tag_offset):
   // since the offset between FrameIndex and IRGstack is a compile-time
   // constant, this can be lowered to a single ADDG instruction.
   if (!(isa<FrameIndexSDNode>(N->getOperand(1)))) {
     return false;
   }
 

llvm/lib/Target/AArch64/AArch64ISelLowering.h

enum NodeType : unsigned {
   /// need to re-interpret the data in SIMD vector registers in big-endian
   /// mode without emitting such REV instructions.
   NVCAST,
 
   SMULL,
   UMULL,
 
   // Reciprocal estimates and steps.
   FRECPE, FRECPS,
   FRSQRTE, FRSQRTS,
 
   SUNPKHI,
   SUNPKLO,
   UUNPKHI,
   UUNPKLO,
 
   CLASTA_N,
enum NodeType : unsigned {
   GLDFF1S_UXTW,
   GLDFF1S_SXTW,
   GLDFF1S_UXTW_SCALED,
   GLDFF1S_SXTW_SCALED,
   GLDFF1S_IMM,
 
   // Non-temporal gather loads
   GLDNT1,
+  GLDNT1_INDEX,
   GLDNT1S,
 
   // Scatter store
   SST1,
   SST1_SCALED,
   SST1_UXTW,
   SST1_SXTW,
   SST1_UXTW_SCALED,
   SST1_SXTW_SCALED,
   SST1_IMM,
 
   // Non-temporal scatter store
   SSTNT1,
+  SSTNT1_INDEX,
 
   // Strict (exception-raising) floating point comparison
   STRICT_FCMP = ISD::FIRST_TARGET_STRICTFP_OPCODE,
   STRICT_FCMPE,
 
   // NEON Load/Store with post-increment base updates
   LD2post = ISD::FIRST_TARGET_MEMORY_OPCODE,
   LD3post,

llvm/lib/Target/AArch64/AArch64ISelLowering.cpp

const char *AArch64TargetLowering::getTargetNodeName(unsigned Opcode) const {
   case AArch64ISD::GLDFF1S_UXTW:      return "AArch64ISD::GLDFF1S_UXTW";
   case AArch64ISD::GLDFF1S_SXTW_SCALED:
     return "AArch64ISD::GLDFF1S_SXTW_SCALED";
   case AArch64ISD::GLDFF1S_UXTW_SCALED:
     return "AArch64ISD::GLDFF1S_UXTW_SCALED";
   case AArch64ISD::GLDFF1S_IMM:       return "AArch64ISD::GLDFF1S_IMM";
 
   case AArch64ISD::GLDNT1:            return "AArch64ISD::GLDNT1";
+  case AArch64ISD::GLDNT1_INDEX:      return "AArch64ISD::GLDNT1_INDEX";
   case AArch64ISD::GLDNT1S:           return "AArch64ISD::GLDNT1S";
 
   case AArch64ISD::SST1:              return "AArch64ISD::SST1";
   case AArch64ISD::SST1_SCALED:       return "AArch64ISD::SST1_SCALED";
   case AArch64ISD::SST1_SXTW:         return "AArch64ISD::SST1_SXTW";
   case AArch64ISD::SST1_UXTW:         return "AArch64ISD::SST1_UXTW";
   case AArch64ISD::SST1_SXTW_SCALED:  return "AArch64ISD::SST1_SXTW_SCALED";
   case AArch64ISD::SST1_UXTW_SCALED:  return "AArch64ISD::SST1_UXTW_SCALED";
   case AArch64ISD::SST1_IMM:          return "AArch64ISD::SST1_IMM";
 
   case AArch64ISD::SSTNT1:            return "AArch64ISD::SSTNT1";
+  case AArch64ISD::SSTNT1_INDEX:      return "AArch64ISD::SSTNT1_INDEX";
 
   case AArch64ISD::LDP:               return "AArch64ISD::LDP";
   case AArch64ISD::STP:               return "AArch64ISD::STP";
   case AArch64ISD::STNP:              return "AArch64ISD::STNP";
   case AArch64ISD::DUP_PRED:          return "AArch64ISD::DUP_PRED";
   case AArch64ISD::INDEX_VECTOR:      return "AArch64ISD::INDEX_VECTOR";
   }
   return nullptr;
if (!T->isSized() ||
     return SDValue();
 
   SDLoc DL(GN);
   SDValue Result = DAG.getGlobalAddress(GV, DL, MVT::i64, Offset);
   return DAG.getNode(ISD::SUB, DL, MVT::i64, Result,
                      DAG.getConstant(MinOffset, DL, MVT::i64));
 }
 
+// Turns the vector of indices into a vector of byte offstes by scaling Offset
+// by (BitWidth / 8).
+static SDValue getScaledOffsetForLDNT1(SelectionDAG &DAG, SDValue Offset,
+                                       SDLoc DL, unsigned BitWidth) {
+  assert(Offset.getValueType().isScalableVector() &&
+         "This method is only for scalable vectors of offsets");
+
+  SDValue Shift = DAG.getConstant(Log2_32(BitWidth / 8), DL, MVT::i64);
+  SDValue SplatShift = DAG.getNode(ISD::SPLAT_VECTOR, DL, MVT::nxv2i64, Shift);
+
+  return DAG.getNode(ISD::SHL, DL, MVT::nxv2i64, Offset, SplatShift);
+}
+
 static SDValue performScatterStoreCombine(SDNode *N, SelectionDAG &DAG,
                                           unsigned Opcode,
                                           bool OnlyPackedOffsets = true) {
   const SDValue Src = N->getOperand(2);
   const EVT SrcVT = Src->getValueType(0);
   assert(SrcVT.isScalableVector() &&
          "Scatter stores are only possible for SVE vectors");
 
static SDValue performScatterStoreCombine(SDNode *N, SelectionDAG &DAG,
 
   // Depending on the addressing mode, this is either a pointer or a vector of
   // pointers (that fits into one register)
   SDValue Base = N->getOperand(4);
   // Depending on the addressing mode, this is either a single offset or a
   // vector of offsets  (that fits into one register)
   SDValue Offset = N->getOperand(5);
 
+  // For "scalar + vector of indices", just scale the indices. This only
+  // applies to non-temporal scatters because there's no instruction that takes
+  // indicies.
+  if (Opcode == AArch64ISD::SSTNT1_INDEX) {
+    Offset = getScaledOffsetForLDNT1(DAG, Offset, DL, SrcElVT.getSizeInBits());
+    Opcode = AArch64ISD::SSTNT1;
+  }
+
   // In the case of non-temporal gather loads there's only one SVE instruction
   // per data-size: "scalar + vector", i.e.
   //    * stnt1{b|h|w|d} { z0.s }, p0/z, [z0.s, x0]
   // Since we do have intrinsics that allow the arguments to be in a different
   // order, we may need to swap them to match the spec.
   if (Opcode == AArch64ISD::SSTNT1 && Offset.getValueType().isVector())
       std::swap(Base, Offset);
 
static SDValue performGatherLoadCombine(SDNode *N, SelectionDAG &DAG,
 
   // Depending on the addressing mode, this is either a pointer or a vector of
   // pointers (that fits into one register)
   SDValue Base = N->getOperand(3);
   // Depending on the addressing mode, this is either a single offset or a
   // vector of offsets  (that fits into one register)
   SDValue Offset = N->getOperand(4);
 
+  // For "scalar + vector of indices", just scale the indices. This only
+  // applies to non-temporal gathers because there's no instruction that takes
+  // indicies.
+  if (Opcode == AArch64ISD::GLDNT1_INDEX) {
+    Offset = getScaledOffsetForLDNT1(DAG, Offset, DL, RetElVT.getSizeInBits());
+    Opcode = AArch64ISD::GLDNT1;
+  }
+
   // In the case of non-temporal gather loads there's only one SVE instruction
   // per data-size: "scalar + vector", i.e.
   //    * ldnt1{b|h|w|d} { z0.s }, p0/z, [z0.s, x0]
   // Since we do have intrinsics that allow the arguments to be in a different
   // order, we may need to swap them to match the spec.
   if (Opcode == AArch64ISD::GLDNT1 && Offset.getValueType().isVector())
       std::swap(Base, Offset);
 
case ISD::INTRINSIC_W_CHAIN:
     case Intrinsic::aarch64_neon_st4lane:
       return performNEONPostLDSTCombine(N, DCI, DAG);
     case Intrinsic::aarch64_sve_ldnt1:
       return performLDNT1Combine(N, DAG);
     case Intrinsic::aarch64_sve_ldnt1_gather_scalar_offset:
       return performGatherLoadCombine(N, DAG, AArch64ISD::GLDNT1);
     case Intrinsic::aarch64_sve_ldnt1_gather:
       return performGatherLoadCombine(N, DAG, AArch64ISD::GLDNT1);
+    case Intrinsic::aarch64_sve_ldnt1_gather_index:
+      return performGatherLoadCombine(N, DAG, AArch64ISD::GLDNT1_INDEX);
     case Intrinsic::aarch64_sve_ldnt1_gather_uxtw:
       return performGatherLoadCombine(N, DAG, AArch64ISD::GLDNT1);
     case Intrinsic::aarch64_sve_ldnf1:
       return performLDNF1Combine(N, DAG, AArch64ISD::LDNF1);
     case Intrinsic::aarch64_sve_ldff1:
       return performLDNF1Combine(N, DAG, AArch64ISD::LDFF1);
     case Intrinsic::aarch64_sve_stnt1:
       return performSTNT1Combine(N, DAG);
     case Intrinsic::aarch64_sve_stnt1_scatter_scalar_offset:
       return performScatterStoreCombine(N, DAG, AArch64ISD::SSTNT1);
     case Intrinsic::aarch64_sve_stnt1_scatter_uxtw:
       return performScatterStoreCombine(N, DAG, AArch64ISD::SSTNT1);
     case Intrinsic::aarch64_sve_stnt1_scatter:
       return performScatterStoreCombine(N, DAG, AArch64ISD::SSTNT1);
+    case Intrinsic::aarch64_sve_stnt1_scatter_index:
+      return performScatterStoreCombine(N, DAG, AArch64ISD::SSTNT1_INDEX);
     case Intrinsic::aarch64_sve_ld1_gather:
       return performGatherLoadCombine(N, DAG, AArch64ISD::GLD1);
     case Intrinsic::aarch64_sve_ld1_gather_index:
       return performGatherLoadCombine(N, DAG, AArch64ISD::GLD1_SCALED);
     case Intrinsic::aarch64_sve_ld1_gather_sxtw:
       return performGatherLoadCombine(N, DAG, AArch64ISD::GLD1_SXTW,
                                       /*OnlyPackedOffsets=*/false);
     case Intrinsic::aarch64_sve_ld1_gather_uxtw:

llvm/lib/Target/AArch64/AArch64SVEInstrInfo.td

 //=- AArch64SVEInstrInfo.td -  AArch64 SVE Instructions -*- tablegen -*-----=//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // AArch64 Scalable Vector Extension (SVE) Instruction definitions.
 //
 //===----------------------------------------------------------------------===//
 
 def SVE8BitLslImm : ComplexPattern<i32, 2, "SelectSVE8BitLslImm", [imm]>;
+def SVELShiftImm64 : ComplexPattern<i32, 1, "SelectSVEShiftImm64<0, 64>", []>;
 
 // Non-faulting loads - node definitions
 //
 def SDT_AArch64_LDNF1 : SDTypeProfile<1, 3, [
   SDTCisVec<0>, SDTCisVec<1>, SDTCisPtrTy<2>,
   SDTCVecEltisVT<1,i1>, SDTCisSameNumEltsAs<0,1>
 ]>;
 

 def AArch64dup_pred : SDNode<"AArch64ISD::DUP_PRED", SDT_AArch64DUP_PRED>;
 
 def SDT_IndexVector : SDTypeProfile<1, 2, [SDTCisVec<0>, SDTCisSameAs<1, 2>, SDTCisInt<2>]>;
 def index_vector : SDNode<"AArch64ISD::INDEX_VECTOR", SDT_IndexVector, []>;
 
 def reinterpret_cast : SDNode<"AArch64ISD::REINTERPRET_CAST", SDTUnaryOp>;
 
 let Predicates = [HasSVE] in {
-
   defm RDFFR_PPz  : sve_int_rdffr_pred<0b0, "rdffr", int_aarch64_sve_rdffr_z>;
   def  RDFFRS_PPz : sve_int_rdffr_pred<0b1, "rdffrs">;
   defm RDFFR_P    : sve_int_rdffr_unpred<"rdffr", int_aarch64_sve_rdffr>;
   def  SETFFR     : sve_int_setffr<"setffr", int_aarch64_sve_setffr>;
   def  WRFFR      : sve_int_wrffr<"wrffr", int_aarch64_sve_wrffr>;
 
   defm ADD_ZZZ   : sve_int_bin_cons_arit_0<0b000, "add", add>;
   defm SUB_ZZZ   : sve_int_bin_cons_arit_0<0b001, "sub", sub>;
multiclass sve_prefetch<SDPatternOperator prefetch, ValueType PredTy, Instruction RegImmInst, Instruction RegRegInst, int scale, ComplexPattern AddrCP> {
   defm DECP_ZP     : sve_int_count_v<0b10100, "decp">;
 
   defm INDEX_RR : sve_int_index_rr<"index", index_vector>;
   defm INDEX_IR : sve_int_index_ir<"index", index_vector>;
   defm INDEX_RI : sve_int_index_ri<"index", index_vector>;
   defm INDEX_II : sve_int_index_ii<"index", index_vector>;
 
   // Unpredicated shifts
-  defm ASR_ZZI : sve_int_bin_cons_shift_imm_right<0b00, "asr">;
-  defm LSR_ZZI : sve_int_bin_cons_shift_imm_right<0b01, "lsr">;
-  defm LSL_ZZI : sve_int_bin_cons_shift_imm_left< 0b11, "lsl">;
+  defm ASR_ZZI : sve_int_bin_cons_shift_imm_right<0b00, "asr", sra>;
+  defm LSR_ZZI : sve_int_bin_cons_shift_imm_right<0b01, "lsr", srl>;
+  defm LSL_ZZI : sve_int_bin_cons_shift_imm_left< 0b11, "lsl", shl>;
+
+  // Patterns for unpredicated left shift by immediate
+  def : Pat<(nxv16i8 (shl (nxv16i8 ZPR:$Zs1),
+                          (nxv16i8 (AArch64dup (vecshiftL8:$imm))))),
+            (LSL_ZZI_B ZPR:$Zs1, vecshiftL8:$imm)>;
+  def : Pat<(nxv8i16 (shl (nxv8i16 ZPR:$Zs1),
+                          (nxv8i16 (AArch64dup (vecshiftL16:$imm))))),
+            (LSL_ZZI_H ZPR:$Zs1, vecshiftL16:$imm)>;
+  def : Pat<(nxv4i32 (shl (nxv4i32 ZPR:$Zs1),
+                          (nxv4i32 (AArch64dup (vecshiftL32:$imm))))),
+            (LSL_ZZI_S ZPR:$Zs1, vecshiftL32:$imm)>;
+  def : Pat<(nxv2i64 (shl (nxv2i64 ZPR:$Zs1),
+                          (nxv2i64 (AArch64dup (i64 (SVELShiftImm64 i32:$imm)))))),
+            (LSL_ZZI_D ZPR:$Zs1, vecshiftL64:$imm)>;
 
   defm ASR_WIDE_ZZZ : sve_int_bin_cons_shift_wide<0b00, "asr">;
   defm LSR_WIDE_ZZZ : sve_int_bin_cons_shift_wide<0b01, "lsr">;
   defm LSL_WIDE_ZZZ : sve_int_bin_cons_shift_wide<0b11, "lsl">;
 
   // Predicated shifts
   defm ASR_ZPmI  : sve_int_bin_pred_shift_imm_right<0b0000, "asr">;
   defm LSR_ZPmI  : sve_int_bin_pred_shift_imm_right<0b0001, "lsr">;

llvm/lib/Target/AArch64/SVEInstrFormats.td

 
 multiclass sve_int_bin_cons_shift_wide<bits<2> opc, string asm> {
   def _B : sve_int_bin_cons_shift_wide<0b00, opc, asm, ZPR8>;
   def _H : sve_int_bin_cons_shift_wide<0b01, opc, asm, ZPR16>;
   def _S : sve_int_bin_cons_shift_wide<0b10, opc, asm, ZPR32>;
 }
 
 class sve_int_bin_cons_shift_imm<bits<4> tsz8_64, bits<2> opc, string asm,
-                               ZPRRegOp zprty, Operand immtype>
+                               ZPRRegOp zprty, Operand immtype, ValueType vt,
+                               SDPatternOperator op>
 : I<(outs zprty:$Zd), (ins zprty:$Zn, immtype:$imm),
   asm, "\t$Zd, $Zn, $imm",
-  "", []>, Sched<[]> {
+  "",
+  [(set (vt zprty:$Zd), (op (vt zprty:$Zn), immtype:$imm))]>, Sched<[]> {
   bits<5> Zd;
   bits<5> Zn;
   bits<6> imm;
   let Inst{31-24} = 0b00000100;
   let Inst{23-22} = tsz8_64{3-2};
   let Inst{21}    = 0b1;
   let Inst{20-19} = tsz8_64{1-0};
   let Inst{18-16} = imm{2-0}; // imm3
   let Inst{15-12} = 0b1001;
   let Inst{11-10} = opc;
   let Inst{9-5}   = Zn;
   let Inst{4-0}   = Zd;
 }
 
-multiclass sve_int_bin_cons_shift_imm_left<bits<2> opc, string asm> {
-  def _B : sve_int_bin_cons_shift_imm<{0,0,0,1}, opc, asm, ZPR8, vecshiftL8>;
-  def _H : sve_int_bin_cons_shift_imm<{0,0,1,?}, opc, asm, ZPR16, vecshiftL16> {
+multiclass sve_int_bin_cons_shift_imm_left<bits<2> opc, string asm,
+                                         SDPatternOperator op> {
+  def _B : sve_int_bin_cons_shift_imm<{0,0,0,1}, opc, asm, ZPR8, vecshiftL8, nxv16i8, op>;
+  def _H : sve_int_bin_cons_shift_imm<{0,0,1,?}, opc, asm, ZPR16, vecshiftL16, nxv8i16, op> {
     let Inst{19} = imm{3};
   }
-  def _S : sve_int_bin_cons_shift_imm<{0,1,?,?}, opc, asm, ZPR32, vecshiftL32> {
+  def _S : sve_int_bin_cons_shift_imm<{0,1,?,?}, opc, asm, ZPR32, vecshiftL32, nxv4i32, op> {
     let Inst{20-19} = imm{4-3};
   }
-  def _D : sve_int_bin_cons_shift_imm<{1,?,?,?}, opc, asm, ZPR64, vecshiftL64> {
+  def _D : sve_int_bin_cons_shift_imm<{1,?,?,?}, opc, asm, ZPR64, vecshiftL64, nxv2i64, op> {
     let Inst{22}    = imm{5};
     let Inst{20-19} = imm{4-3};
   }
 }
 
-multiclass sve_int_bin_cons_shift_imm_right<bits<2> opc, string asm> {
-  def _B : sve_int_bin_cons_shift_imm<{0,0,0,1}, opc, asm, ZPR8, vecshiftR8>;
-  def _H : sve_int_bin_cons_shift_imm<{0,0,1,?}, opc, asm, ZPR16, vecshiftR16> {
+multiclass sve_int_bin_cons_shift_imm_right<bits<2> opc, string asm,
+                                          SDPatternOperator op> {
+  def _B : sve_int_bin_cons_shift_imm<{0,0,0,1}, opc, asm, ZPR8, vecshiftR8, nxv16i8, op>;
+  def _H : sve_int_bin_cons_shift_imm<{0,0,1,?}, opc, asm, ZPR16, vecshiftR16, nxv8i16, op> {
     let Inst{19} = imm{3};
   }
-  def _S : sve_int_bin_cons_shift_imm<{0,1,?,?}, opc, asm, ZPR32, vecshiftR32> {
+  def _S : sve_int_bin_cons_shift_imm<{0,1,?,?}, opc, asm, ZPR32, vecshiftR32, nxv4i32, op> {
     let Inst{20-19} = imm{4-3};
   }
-  def _D : sve_int_bin_cons_shift_imm<{1,?,?,?}, opc, asm, ZPR64, vecshiftR64> {
+  def _D : sve_int_bin_cons_shift_imm<{1,?,?,?}, opc, asm, ZPR64, vecshiftR64, nxv2i64, op> {
     let Inst{22}    = imm{5};
     let Inst{20-19} = imm{4-3};
   }
 }
 //===----------------------------------------------------------------------===//
 // SVE Memory - Store Group
 //===----------------------------------------------------------------------===//
 

llvm/test/CodeGen/AArch64/sve2-intrinsics-nt-gather-loads-64bit-scaled-offset.ll

+; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sve2 < %s | FileCheck %s
+
+;
+; LDNT1H, LDNT1W, LDNT1D: base + 64-bit index
+;   e.g.
+;     lsl z0.d, z0.d, #1
+;     ldnt1h z0.d, p0/z, [z0.d, x0]
+;
+
+define <vscale x 2 x i64> @gldnt1h_index(<vscale x 2 x i1> %pg, i16* %base, <vscale x 2 x i64> %b) {
+; CHECK-LABEL: gldnt1h_index
+; CHECK:        lsl z0.d, z0.d, #1
+; CHECK-NEXT:   ldnt1h  { z0.d }, p0/z, [z0.d, x0]
+; CHECK-NEXT:   ret
+  %load = call <vscale x 2 x i16> @llvm.aarch64.sve.ldnt1.gather.index.nxv2i16(<vscale x 2 x i1> %pg,
+                                                                               i16* %base,
+                                                                               <vscale x 2 x i64> %b)
+  %res = zext <vscale x 2 x i16> %load to <vscale x 2 x i64>
+  ret <vscale x 2 x i64> %res
+}
+
+define <vscale x 2 x i64> @gldnt1w_index(<vscale x 2 x i1> %pg, i32* %base, <vscale x 2 x i64> %b) {
+; CHECK-LABEL: gldnt1w_index
+; CHECK:        lsl z0.d, z0.d, #2
+; CHECK-NEXT:   ldnt1w  { z0.d }, p0/z, [z0.d, x0]
+; CHECK-NEXT:   ret
+  %load = call <vscale x 2 x i32> @llvm.aarch64.sve.ldnt1.gather.index.nxv2i32(<vscale x 2 x i1> %pg,
+                                                                               i32* %base,
+                                                                               <vscale x 2 x i64> %b)
+  %res = zext <vscale x 2 x i32> %load to <vscale x 2 x i64>
+  ret <vscale x 2 x i64> %res
+}
+
+define <vscale x 2 x i64> @gldnt1d_index(<vscale x 2 x i1> %pg, i64* %base, <vscale x 2 x i64> %b) {
+; CHECK-LABEL: gldnt1d_index
+; CHECK:        lsl z0.d, z0.d, #3
+; CHECK-NEXT:   ldnt1d  { z0.d }, p0/z, [z0.d, x0]
+; CHECK-NEXT:   ret
+  %load = call <vscale x 2 x i64> @llvm.aarch64.sve.ldnt1.gather.index.nxv2i64(<vscale x 2 x i1> %pg,
+                                                                               i64* %base,
+                                                                               <vscale x 2 x i64> %b)
+  ret <vscale x 2 x i64> %load
+}
+
+define <vscale x 2 x double> @gldnt1d_index_double(<vscale x 2 x i1> %pg, double* %base, <vscale x 2 x i64> %b) {
+; CHECK-LABEL: gldnt1d_index_double
+; CHECK:        lsl z0.d, z0.d, #3
+; CHECK-NEXT:   ldnt1d  { z0.d }, p0/z, [z0.d, x0]
+; CHECK-NEXT:   ret
+  %load = call <vscale x 2 x double> @llvm.aarch64.sve.ldnt1.gather.index.nxv2f64(<vscale x 2 x i1> %pg,
+                                                                                  double* %base,
+                                                                                  <vscale x 2 x i64> %b)
+  ret <vscale x 2 x double> %load
+}
+
+;
+; LDNT1SH, LDNT1SW: base + 64-bit index
+;   e.g.
+;     lsl z0.d, z0.d, #1
+;     ldnt1sh z0.d, p0/z, [z0.d, x0]
+;
+
+define <vscale x 2 x i64> @gldnt1sh_index(<vscale x 2 x i1> %pg, i16* %base, <vscale x 2 x i64> %b) {
+; CHECK-LABEL: gldnt1sh_index
+; CHECK:        lsl z0.d, z0.d, #1
+; CHECK-NEXT:   ldnt1sh { z0.d }, p0/z, [z0.d, x0]
+; CHECK-NEXT:   ret
+  %load = call <vscale x 2 x i16> @llvm.aarch64.sve.ldnt1.gather.index.nxv2i16(<vscale x 2 x i1> %pg,
+                                                                               i16* %base,
+                                                                               <vscale x 2 x i64> %b)
+  %res = sext <vscale x 2 x i16> %load to <vscale x 2 x i64>
+  ret <vscale x 2 x i64> %res
+}
+
+define <vscale x 2 x i64> @gldnt1sw_index(<vscale x 2 x i1> %pg, i32* %base, <vscale x 2 x i64> %b) {
+; CHECK-LABEL: gldnt1sw_index
+; CHECK:        lsl z0.d, z0.d, #2
+; CHECK-NEXT:   ldnt1sw { z0.d }, p0/z, [z0.d, x0]
+; CHECK-NEXT:   ret
+  %load = call <vscale x 2 x i32> @llvm.aarch64.sve.ldnt1.gather.index.nxv2i32(<vscale x 2 x i1> %pg,
+                                                                               i32* %base,
+                                                                               <vscale x 2 x i64> %b)
+  %res = sext <vscale x 2 x i32> %load to <vscale x 2 x i64>
+  ret <vscale x 2 x i64> %res
+}
+
+declare <vscale x 2 x i16> @llvm.aarch64.sve.ldnt1.gather.index.nxv2i16(<vscale x 2 x i1>, i16*, <vscale x 2 x i64>)
+declare <vscale x 2 x i32> @llvm.aarch64.sve.ldnt1.gather.index.nxv2i32(<vscale x 2 x i1>, i32*, <vscale x 2 x i64>)
+declare <vscale x 2 x i64> @llvm.aarch64.sve.ldnt1.gather.index.nxv2i64(<vscale x 2 x i1>, i64*, <vscale x 2 x i64>)
+declare <vscale x 2 x double> @llvm.aarch64.sve.ldnt1.gather.index.nxv2f64(<vscale x 2 x i1>, double*, <vscale x 2 x i64>)

llvm/test/CodeGen/AArch64/sve2-intrinsics-nt-scatter-stores-64bit-scaled-offset.ll

+; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sve2 < %s | FileCheck %s
+
+;
+; STNT1H, STNT1W, STNT1D: base + 64-bit index
+;   e.g.
+;     lsl z1.d, z1.d, #1
+;     stnt1h { z0.d }, p0, [z0.d, x0]
+;
+
+define void @sstnt1h_index(<vscale x 2 x i64> %data, <vscale x 2 x i1> %pg, i16* %base, <vscale x 2 x i64> %offsets) {
+; CHECK-LABEL: sstnt1h_index
+; CHECK:        lsl z1.d, z1.d, #1
+; CHECK-NEXT:   stnt1h  { z0.d }, p0, [z1.d, x0]
+; CHECK-NEXT:   ret
+  %data_trunc = trunc <vscale x 2 x i64> %data to <vscale x 2 x i16>
+  call void @llvm.aarch64.sve.stnt1.scatter.index.nxv2i16(<vscale x 2 x i16> %data_trunc,
+                                                          <vscale x 2 x i1> %pg,
+                                                          i16* %base,
+                                                          <vscale x 2 x i64> %offsets)
+  ret void
+}
+
+define void @sstnt1w_index(<vscale x 2 x i64> %data, <vscale x 2 x i1> %pg, i32* %base, <vscale x 2 x i64> %offsets) {
+; CHECK-LABEL: sstnt1w_index
+; CHECK:        lsl z1.d, z1.d, #2
+; CHECK-NEXT:   stnt1w  { z0.d }, p0, [z1.d, x0]
+; CHECK-NEXT:   ret
+  %data_trunc = trunc <vscale x 2 x i64> %data to <vscale x 2 x i32>
+  call void @llvm.aarch64.sve.stnt1.scatter.index.nxv2i32(<vscale x 2 x i32> %data_trunc,
+                                                          <vscale x 2 x i1> %pg,
+                                                          i32* %base,
+                                                          <vscale x 2 x i64> %offsets)
+  ret void
+}
+
+define void  @sstnt1d_index(<vscale x 2 x i64> %data, <vscale x 2 x i1> %pg, i64* %base, <vscale x 2 x i64> %offsets) {
+; CHECK-LABEL: sstnt1d_index
+; CHECK:        lsl z1.d, z1.d, #3
+; CHECK-NEXT:   stnt1d  { z0.d }, p0, [z1.d, x0]
+; CHECK-NEXT:   ret
+  call void @llvm.aarch64.sve.stnt1.scatter.index.nxv2i64(<vscale x 2 x i64> %data,
+                                                          <vscale x 2 x i1> %pg,
+                                                          i64* %base,
+                                                          <vscale x 2 x i64> %offsets)
+  ret void
+}
+
+define void  @sstnt1d_index_double(<vscale x 2 x double> %data, <vscale x 2 x i1> %pg, double* %base, <vscale x 2 x i64> %offsets) {
+; CHECK-LABEL: sstnt1d_index_double
+; CHECK:        lsl z1.d, z1.d, #3
+; CHECK-NEXT:   stnt1d  { z0.d }, p0, [z1.d, x0]
+; CHECK-NEXT:   ret
+  call void @llvm.aarch64.sve.stnt1.scatter.index.nxv2f64(<vscale x 2 x double> %data,
+                                                          <vscale x 2 x i1> %pg,
+                                                          double* %base,
+                                                          <vscale x 2 x i64> %offsets)
+  ret void
+}
+
+
+declare void @llvm.aarch64.sve.stnt1.scatter.index.nxv2i16(<vscale x 2 x i16>, <vscale x 2 x i1>, i16*, <vscale x 2 x i64>)
+declare void @llvm.aarch64.sve.stnt1.scatter.index.nxv2i32(<vscale x 2 x i32>, <vscale x 2 x i1>, i32*, <vscale x 2 x i64>)
+declare void @llvm.aarch64.sve.stnt1.scatter.index.nxv2i64(<vscale x 2 x i64>, <vscale x 2 x i1>, i64*, <vscale x 2 x i64>)
+declare void @llvm.aarch64.sve.stnt1.scatter.index.nxv2f64(<vscale x 2 x double>, <vscale x 2 x i1>, double*, <vscale x 2 x i64>)