[PowerPC] Exploit Prefixed Load/Stores using the refactored Load/Store Implementation

[amyk]

Summary

This patch exploits the prefixed load and store instructions utilizing the refactored load/store
implementation introduced in D93370.

Prefixed load and store instructions are emitted whenever we are loading or storing a value with an
offset that fits into a 34-bit signed immediate.
Patterns for the prefixed load and stores are added in this patch, as well as the implementation that
detects when we are loading and storing a value with an offset that fits in 34-bits.

Depends on D95116.

[amyk]

• Update LIT test cases with prefixed load/store checks.
• Added a PrefixInstrs flag.

[amyk]

Address clang-format comments.

[amyk]

Update patch based on dependent patch (D95116) update, and update test cases with necessary changes.

[amyk]

Gentle ping.

[stefanp]

Looking at the test case changes there seem to be a few places where we are not generating expected code.
I've added comments to some of those places.

llvm/test/CodeGen/PowerPC/prefixed-ld-st.ll

365

Hmm... that's interesting.
This is probably not related to this patch but this code looks odd.
For starters pstxsd is a D-Form instruction but we are listing two registers and no immediate.

Also,

pli r4, 4294967297
add r3, r3, r4

can probably be written as a paddi.

paddi r3, r3, 4294967297, 0

I feel like we need a TODO for this.

llvm/test/CodeGen/PowerPC/scalar-double-ldst.ll

3135 ↗

(On Diff #330641)

This doesn't look right.
I assume we are trying to incorporate the pli into the lfsx but somehow the compiler gets confused and doesn't do that. Also, plfs is a D-Form and should have an immediate.

3261 ↗

(On Diff #330641)

We have expanded the pli into two instructions at this point which we shouldn't do.
Again, I think we are trying to merge pli and lfsx into plfs but that's not working as expected.

[amyk]

• Rebase patch
• Address review comment made by Stefan involving plfs and pstxsd using two registers such as pstxsd v2, r3(r3), 0 (despite being a prefixed DForm instruction) instead of a register and an immediate. This was caused by the pattern for these instructions being written incorrectly. The patterns have been updated accordingly so the prefixed instructions use a register and an immediate.

[amyk]

Gentle ping.

[nemanjai]

LGTM other than the missing assert. Also, please look into the interaction between prefixed instructions, pc-relative memops, paired memops and whether we do the right thing when 1/2 of those are turned on and others turned off (this can be done in a subsequent patch).

llvm/lib/Target/PowerPC/PPCISelLowering.cpp

16617

I don't really understand what ensures that the intrinsic is one of ppc_vsx_lxvp/ppc_vsx_stxvp? What if it is something different entirely? It may be that we only call this function for those two now, but think about the future as well.
Even an assert would probably do here.

llvm/lib/Target/PowerPC/PPCISelLowering.h

698

I added a comment in the previous revision that MOF_SubtargetP10 should really be something like MOF_PrefixInstrs but perhaps I missed something. Is there any reason we need both? Are there conditions where we want a different non-prefixed addressing mode for P10 instructions?

[nemanjai]

I thought I had selected "Accept" when adding the last comment.

[amyk]

Discussed offline with Nemanja to update the revision.

• Add assert for the paired vector intrinsics
• Add assert for 256-bit vectors

I've also changed PPCRegisterInfo.cpp to take prefixed instructions into account.

[amyk]

@nemanjai I've updated the prefixed load/store patch once more, if you could take another look when you get the chance to see if I have addressed the comments that we discussed about offline, that would be great.

[nemanjai]

LGTM.

llvm/lib/Target/PowerPC/PPCInstrPrefix.td

2666

Nit: this line appears to be too long (and so does 2710).

llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp

public:
     /// SelectPCRelForm - Returns true if address N can be represented by
     /// PC-Relative addressing mode.
     bool SelectPCRelForm(SDNode *Parent, SDValue N, SDValue &Disp,
                          SDValue &Base) {
       return PPCLowering->SelectOptimalAddrMode(Parent, N, Disp, Base, *CurDAG,
                                                 None) == PPC::AM_PCRel;
     }
 
+    /// SelectPDForm - Returns true if address N can be represented by Prefixed
+    /// DForm addressing mode (a base register, plus a signed 34-bit immediate.
+    bool SelectPDForm(SDNode *Parent, SDValue N, SDValue &Disp, SDValue &Base) {
+      return PPCLowering->SelectOptimalAddrMode(Parent, N, Disp, Base, *CurDAG,
+                                                None) == PPC::AM_PrefixDForm;
+    }
+
     /// SelectXForm - Returns true if address N can be represented by the
     /// addressing mode of XForm instructions (an indexed [r+r] operation).
     bool SelectXForm(SDNode *Parent, SDValue N, SDValue &Disp, SDValue &Base) {
       return PPCLowering->SelectOptimalAddrMode(Parent, N, Disp, Base, *CurDAG,
                                                 None) == PPC::AM_XForm;
     }
 
     /// SelectForceXForm - Given the specified address, force it to be

llvm/lib/Target/PowerPC/PPCISelLowering.h

enum MemOpFlags {
       MOF_ScalarFloat = 1 << 18,
       MOF_Vector = 1 << 19,
       MOF_Vector256 = 1 << 20,
 
       // Subtarget features.
       MOF_SubtargetBeforeP9 = 1 << 22,
       MOF_SubtargetP9 = 1 << 23,
       MOF_SubtargetP10 = 1 << 24,
-      MOF_SubtargetSPE = 1 << 25
+      MOF_SubtargetSPE = 1 << 25,
+      MOF_PrefixInstrs = 1 << 26
     };
 
     // The addressing modes for loads and stores.
     enum AddrMode {
       AM_None,
       AM_DForm,
       AM_DSForm,
       AM_DQForm,
+      AM_PrefixDForm,
       AM_XForm,
       AM_PCRel
     };
   } // end namespace PPC
 
   class PPCTargetLowering : public TargetLowering {
     const PPCSubtarget &Subtarget;
 

llvm/lib/Target/PowerPC/PPCISelLowering.cpp

void PPCTargetLowering::initializeAddrModeMap() {
   AddrModesMap[PPC::AM_DQForm] = {
       PPC::MOF_RPlusSImm16Mult16 | PPC::MOF_Vector | PPC::MOF_SubtargetP9,
       PPC::MOF_RPlusSImm16Mult16 | PPC::MOF_Vector256 | PPC::MOF_SubtargetP10,
       PPC::MOF_NotAddNorCst | PPC::MOF_Vector | PPC::MOF_SubtargetP9,
       PPC::MOF_NotAddNorCst | PPC::MOF_Vector256 | PPC::MOF_SubtargetP10,
       PPC::MOF_AddrIsSImm32 | PPC::MOF_Vector | PPC::MOF_SubtargetP9,
       PPC::MOF_AddrIsSImm32 | PPC::MOF_Vector256 | PPC::MOF_SubtargetP10,
   };
+  AddrModesMap[PPC::AM_PrefixDForm] = {PPC::MOF_PrefixInstrs |
+                                       PPC::MOF_RPlusSImm34 |
+                                       PPC::MOF_SubtargetP10};
   AddrModesMap[PPC::AM_PCRel] = {PPC::MOF_PCRel | PPC::MOF_SubtargetP10};
 }
 
 /// getMaxByValAlign - Helper for getByValTypeAlignment to determine
 /// the desired ByVal argument alignment.
 static void getMaxByValAlign(Type *Ty, Align &MaxAlign, Align MaxMaxAlign) {
   if (MaxAlign == MaxMaxAlign)
     return;
for (auto FlagSet : AddrModesMap.at(PPC::AM_DForm))
     if ((Flags & FlagSet) == FlagSet)
       return PPC::AM_DForm;
   for (auto FlagSet : AddrModesMap.at(PPC::AM_DSForm))
     if ((Flags & FlagSet) == FlagSet)
       return PPC::AM_DSForm;
   for (auto FlagSet : AddrModesMap.at(PPC::AM_DQForm))
     if ((Flags & FlagSet) == FlagSet)
       return PPC::AM_DQForm;
+  for (auto FlagSet : AddrModesMap.at(PPC::AM_PrefixDForm))
+    if ((Flags & FlagSet) == FlagSet)
+      return PPC::AM_PrefixDForm;
   for (auto FlagSet : AddrModesMap.at(PPC::AM_PCRel))
     if ((Flags & FlagSet) == FlagSet)
       return PPC::AM_PCRel;
   // If no other forms are selected, return an X-Form instructions can
   // always be matched.
   return PPC::AM_XForm;
 }
 
if (!Subtarget.hasP9Vector())
     FlagSet |= PPC::MOF_SubtargetBeforeP9;
   else {
     FlagSet |= PPC::MOF_SubtargetP9;
     if (Subtarget.isISA3_1())
       FlagSet |= PPC::MOF_SubtargetP10;
   }
   if (Subtarget.hasSPE())
     FlagSet |= PPC::MOF_SubtargetSPE;
+  if (Subtarget.hasPrefixInstrs())
+    FlagSet |= PPC::MOF_PrefixInstrs;
 
   auto SetAlignFlagsForImm = [&](uint64_t Imm) {
     if ((Imm & 0x3) == 0)
       FlagSet |= PPC::MOF_RPlusSImm16Mult4;
     if ((Imm & 0xf) == 0)
       FlagSet |= PPC::MOF_RPlusSImm16Mult16;
   };
 
if (FlagSet & PPC::MOF_SubtargetP10) {
     if (N.getOpcode() == PPCISD::MAT_PCREL_ADDR ||
         isValidPCRelNode<ConstantPoolSDNode>(N) ||
         isValidPCRelNode<GlobalAddressSDNode>(N) ||
         isValidPCRelNode<JumpTableSDNode>(N) ||
         isValidPCRelNode<BlockAddressSDNode>(N)) {
       FlagSet |= PPC::MOF_PCRel;
       return FlagSet;
     }
+
+    // If the node is the paired load/store intrinsics, compute flags for
+    // address computation and return early.
+    unsigned ParentOp = Parent->getOpcode();
+    if ((ParentOp == ISD::INTRINSIC_W_CHAIN) ||
+        (ParentOp == ISD::INTRINSIC_VOID)) {
+      unsigned ID = cast<ConstantSDNode>(Parent->getOperand(1))->getZExtValue();
+      SDValue IntrinOp = (ID == Intrinsic::ppc_vsx_lxvp) ?
+        Parent->getOperand(2) : Parent->getOperand(3);
+      computeFlagsForAddressComputation(IntrinOp);
+      FlagSet |= PPC::MOF_Vector256;
+      return FlagSet;
+    }
   }
 
   // Mark this as something we don't want to handle here if it is atomic
   // or pre-increment instruction.
   if (const LSBaseSDNode *LSB = dyn_cast<LSBaseSDNode>(Parent))
     if (LSB->isIndexed())
       return PPC::MOF_None;
 
case PPC::AM_DQForm: {
     Disp = DAG.getTargetConstant(0, DL, getPointerTy(DAG.getDataLayout()));
     if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N)) {
       Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
       fixupFuncForFI(DAG, FI->getIndex(), N.getValueType());
     } else
       Base = N;
     break;
   }
+  case PPC::AM_PrefixDForm: {
+    int64_t Imm34 = 0;
+    unsigned Opcode = N.getOpcode();
+    if (((Opcode == ISD::ADD) || (Opcode == ISD::OR)) &&
+        (isIntS34Immediate(N.getOperand(1), Imm34))) {
+      // N is an Add/OR Node, and it's operand is a 34-bit signed immediate.
+      Disp = DAG.getTargetConstant(Imm34, DL, N.getValueType());
+      if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N.getOperand(0)))
+        Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
+      else
+        Base = N.getOperand(0);
+    } else if (isIntS34Immediate(N, Imm34)) {
+      // The address is a 34-bit signed immediate.
+      Disp = DAG.getTargetConstant(Imm34, DL, N.getValueType());
+      Base = DAG.getRegister(PPC::ZERO8, N.getValueType());
+    }
+    break;
+  }
   case PPC::AM_PCRel: {
     Disp = N;
     break;
   }
   case PPC::AM_None:
     break;
   default: { // By default, X-Form is always available to be selected.
     // When a frame index is not aligned, we also match by XForm.

llvm/lib/Target/PowerPC/PPCInstrInfo.td

 
 // Load and Store Instruction Selection addressing modes.
 def DForm  : ComplexPattern<iPTR, 2, "SelectDForm",    [], [SDNPWantParent]>;
 def DSForm : ComplexPattern<iPTR, 2, "SelectDSForm",   [], [SDNPWantParent]>;
 def DQForm : ComplexPattern<iPTR, 2, "SelectDQForm",   [], [SDNPWantParent]>;
 def XForm  : ComplexPattern<iPTR, 2, "SelectXForm",    [], [SDNPWantParent]>;
 def ForceXForm : ComplexPattern<iPTR, 2, "SelectForceXForm", [], [SDNPWantParent]>;
 def PCRelForm : ComplexPattern<iPTR, 2, "SelectPCRelForm", [], [SDNPWantParent]>;
+def PDForm : ComplexPattern<iPTR, 2, "SelectPDForm",   [], [SDNPWantParent]>;
 
 //===----------------------------------------------------------------------===//
 // PowerPC Instruction Predicate Definitions.
 def In32BitMode  : Predicate<"!Subtarget->isPPC64()">;
 def In64BitMode  : Predicate<"Subtarget->isPPC64()">;
 def IsBookE  : Predicate<"Subtarget->isBookE()">;
 def IsNotBookE  : Predicate<"!Subtarget->isBookE()">;
 def HasOnlyMSYNC : Predicate<"Subtarget->hasOnlyMSYNC()">;

llvm/lib/Target/PowerPC/PPCInstrPrefix.td

let mayLoad = 0, mayStore = 1, Predicates = [PairedVectorMemops, PrefixInstrs] in {
   defm PSTXVP :
     8LS_DForm_R_XTp5_SI34_MEM_p<1, 62, (outs), (ins vsrprc:$XTp, memri34:$D_RA),
                                 (ins vsrprc:$XTp, memri34_pcrel:$D_RA),
                                 "pstxvp $XTp, $D_RA", IIC_LdStLFD>;
 }
 
 let Predicates = [PairedVectorMemops] in {
   // Intrinsics for Paired Vector Loads.
-  def : Pat<(v256i1 (int_ppc_vsx_lxvp iaddrX16:$src)), (LXVP memrix16:$src)>;
-  def : Pat<(v256i1 (int_ppc_vsx_lxvp xaddrX16:$src)), (LXVPX xaddrX16:$src)>;
+  def : Pat<(v256i1 (int_ppc_vsx_lxvp DQForm:$src)), (LXVP memrix16:$src)>;
+  def : Pat<(v256i1 (int_ppc_vsx_lxvp XForm:$src)), (LXVPX XForm:$src)>;
   let Predicates = [PairedVectorMemops, PrefixInstrs] in {
-    def : Pat<(v256i1 (int_ppc_vsx_lxvp iaddrX34:$src)), (PLXVP memri34:$src)>;
+    def : Pat<(v256i1 (int_ppc_vsx_lxvp PDForm:$src)), (PLXVP memri34:$src)>;
   }
   // Intrinsics for Paired Vector Stores.
-  def : Pat<(int_ppc_vsx_stxvp v256i1:$XSp, iaddrX16:$dst),
+  def : Pat<(int_ppc_vsx_stxvp v256i1:$XSp, DQForm:$dst),
             (STXVP $XSp, memrix16:$dst)>;
-  def : Pat<(int_ppc_vsx_stxvp v256i1:$XSp, xaddrX16:$dst),
-            (STXVPX $XSp, xaddrX16:$dst)>;
+  def : Pat<(int_ppc_vsx_stxvp v256i1:$XSp, XForm:$dst),
+            (STXVPX $XSp, XForm:$dst)>;
   let Predicates = [PairedVectorMemops, PrefixInstrs] in {
-    def : Pat<(int_ppc_vsx_stxvp v256i1:$XSp, iaddrX34:$dst),
+    def : Pat<(int_ppc_vsx_stxvp v256i1:$XSp, PDForm:$dst),
               (PSTXVP $XSp, memri34:$dst)>;
   }
 }
 
 let Predicates = [PCRelativeMemops] in {
   // Load i32
   def : Pat<(i32 (zextloadi8  (PPCmatpcreladdr PCRelForm:$ga))),
             (PLBZpc $ga, 0)>;
def : Pat<(f64 nzFPImmAsi32:$A),
   def : xxevalPattern<(or (vnot v4i32:$vA), (or v4i32:$vB, v4i32:$vC)),
                        !sub(255, 8)>;
   // nand(A, eqv(B, C))
   def : xxevalPattern<(or (vnot v4i32:$vA), (xor v4i32:$vB, v4i32:$vC)),
                        !sub(255, 9)>;
   // nand(A, nand(B, C))
   def : xxevalPattern<(or (vnot v4i32:$vA), (and v4i32:$vB, v4i32:$vC)),
                        !sub(255, 14)>;
+
+  // Anonymous patterns to select prefixed VSX loads and stores.
+  // Load / Store f128
+  def : Pat<(f128 (load PDForm:$src)),
+            (COPY_TO_REGCLASS (PLXV memri34:$src), VRRC)>;
+  def : Pat<(store f128:$XS, PDForm:$dst),
+            (PSTXV (COPY_TO_REGCLASS $XS, VSRC), memri34:$dst)>;
+
+  // Load / Store v4i32
+  def : Pat<(v4i32 (load PDForm:$src)), (PLXV memri34:$src)>;
+  def : Pat<(store v4i32:$XS, PDForm:$dst), (PSTXV $XS, memri34:$dst)>;
+
+  // Load / Store v2i64
+  def : Pat<(v2i64 (load PDForm:$src)), (PLXV memri34:$src)>;
+  def : Pat<(store v2i64:$XS, PDForm:$dst), (PSTXV $XS, memri34:$dst)>;
+
+  // Load / Store v4f32
+  def : Pat<(v4f32 (load PDForm:$src)), (PLXV memri34:$src)>;
+  def : Pat<(store v4f32:$XS, PDForm:$dst), (PSTXV $XS, memri34:$dst)>;
+
+  // Load / Store v2f64
+  def : Pat<(v2f64 (load PDForm:$src)), (PLXV memri34:$src)>;
+  def : Pat<(store v2f64:$XS, PDForm:$dst), (PSTXV $XS, memri34:$dst)>;
+
+  // Cases For PPCstore_scal_int_from_vsr
+  def : Pat<(PPCstore_scal_int_from_vsr
+            (f64 (PPCcv_fp_to_uint_in_vsr f64:$src)), (PDForm:$dst), 8),
+            (PSTXSD (XSCVDPUXDS f64:$src), memri34:$dst)>;
+  def : Pat<(PPCstore_scal_int_from_vsr
+            (f64 (PPCcv_fp_to_sint_in_vsr f64:$src)), (PDForm:$dst), 8),
+            (PSTXSD (XSCVDPSXDS f64:$src), memri34:$dst)>;
+  def : Pat<(PPCstore_scal_int_from_vsr
+            (f64 (PPCcv_fp_to_uint_in_vsr f128:$src)), (PDForm:$dst), 8),
+            (PSTXSD (COPY_TO_REGCLASS (XSCVQPUDZ f128:$src), VFRC), memri34:$dst)>;
+  def : Pat<(PPCstore_scal_int_from_vsr
+            (f64 (PPCcv_fp_to_sint_in_vsr f128:$src)), (PDForm:$dst), 8),
+            (PSTXSD (COPY_TO_REGCLASS (XSCVQPSDZ f128:$src), VFRC), memri34:$dst)>;
 }
 
 let Predicates = [PrefixInstrs] in {
   def : Pat<(i32 imm34:$imm), (PLI (getImmAs64BitInt imm:$imm))>;
   def : Pat<(i64 imm34:$imm), (PLI8 (getImmAs64BitInt imm:$imm))>;
   def : Pat<(v16i8 (int_ppc_vsx_xxpermx v16i8:$A, v16i8:$B, v16i8:$C, timm:$D)),
             (COPY_TO_REGCLASS (XXPERMX (COPY_TO_REGCLASS $A, VSRC),
                                        (COPY_TO_REGCLASS $B, VSRC),
                                        (COPY_TO_REGCLASS $C, VSRC), $D), VSRC)>;
   def : Pat<(v16i8 (int_ppc_vsx_xxblendvb v16i8:$A, v16i8:$B, v16i8:$C)),
             (COPY_TO_REGCLASS
                    (XXBLENDVB (COPY_TO_REGCLASS $A, VSRC),
                               (COPY_TO_REGCLASS $B, VSRC),
                               (COPY_TO_REGCLASS $C, VSRC)), VSRC)>;
   def : Pat<(v8i16 (int_ppc_vsx_xxblendvh v8i16:$A, v8i16:$B, v8i16:$C)),
             (COPY_TO_REGCLASS
                    (XXBLENDVH (COPY_TO_REGCLASS $A, VSRC),
                               (COPY_TO_REGCLASS $B, VSRC),
                               (COPY_TO_REGCLASS $C, VSRC)), VSRC)>;
   def : Pat<(int_ppc_vsx_xxblendvw v4i32:$A, v4i32:$B, v4i32:$C),
             (XXBLENDVW $A, $B, $C)>;
   def : Pat<(int_ppc_vsx_xxblendvd v2i64:$A, v2i64:$B, v2i64:$C),
             (XXBLENDVD $A, $B, $C)>;
+
+  // Anonymous patterns to select prefixed loads and stores.
+  // Load i32
+  def : Pat<(i32 (extloadi8 PDForm:$src)), (PLBZ memri34:$src)>;
+  def : Pat<(i32 (zextloadi8 PDForm:$src)), (PLBZ memri34:$src)>;
+  def : Pat<(i32 (extloadi16 PDForm:$src)), (PLHZ memri34:$src)>;
+  def : Pat<(i32 (zextloadi16 PDForm:$src)), (PLHZ memri34:$src)>;
+  def : Pat<(i32 (sextloadi16 PDForm:$src)), (PLHA memri34:$src)>;
+  def : Pat<(i32 (load PDForm:$src)), (PLWZ memri34:$src)>;
+
+  // Store i32
+  def : Pat<(truncstorei8 i32:$rS, PDForm:$dst), (PSTB gprc:$rS, memri34:$dst)>;
+  def : Pat<(truncstorei16 i32:$rS, PDForm:$dst), (PSTH gprc:$rS, memri34:$dst)>;
+  def : Pat<(store i32:$rS, PDForm:$dst), (PSTW gprc:$rS, memri34:$dst)>;
+
+  // Load i64
+  def : Pat<(i64 (extloadi8 PDForm:$src)), (PLBZ8 memri34:$src)>;
+  def : Pat<(i64 (zextloadi8 PDForm:$src)), (PLBZ8 memri34:$src)>;
+  def : Pat<(i64 (extloadi16 PDForm:$src)), (PLHZ8 memri34:$src)>;
+  def : Pat<(i64 (zextloadi16 PDForm:$src)), (PLHZ8 memri34:$src)>;
+  def : Pat<(i64 (sextloadi16 PDForm:$src)), (PLHA8 memri34:$src)>;
+  def : Pat<(i64 (extloadi32 PDForm:$src)), (PLWZ8 memri34:$src)>;
+  def : Pat<(i64 (zextloadi32 PDForm:$src)), (PLWZ8 memri34:$src)>;
+  def : Pat<(i64 (sextloadi32 PDForm:$src)), (PLWA8 memri34:$src)>;
+  def : Pat<(i64 (load PDForm:$src)), (PLD memri34:$src)>;
+
+  // Store i64
+  def : Pat<(truncstorei8 i64:$rS, PDForm:$dst), (PSTB8 g8rc:$rS, memri34:$dst)>;
+  def : Pat<(truncstorei16 i64:$rS, PDForm:$dst), (PSTH8 g8rc:$rS, memri34:$dst)>;
+  def : Pat<(truncstorei32 i64:$rS, PDForm:$dst), (PSTW8 g8rc:$rS, memri34:$dst)>;
+  def : Pat<(store i64:$rS, PDForm:$dst), (PSTD g8rc:$rS, memri34:$dst)>;
+
+  // Load / Store f32
+  def : Pat<(f32 (load PDForm:$src)), (PLFS memri34:$src)>;
+  def : Pat<(store f32:$FRS, PDForm:$dst), (PSTFS $FRS, memri34:$dst)>;
+
+  // Load / Store f64
+  def : Pat<(f64 (extloadf32 (PDForm:$src))),
+            (COPY_TO_REGCLASS (PLFS memri34:$src), VSFRC)>;
+  def : Pat<(f64 (load PDForm:$src)), (PLFD memri34:$src)>;
+  def : Pat<(store f64:$FRS, PDForm:$dst), (PSTFD $FRS, memri34:$dst)>;
+
+  // Atomic Load
+  def : Pat<(atomic_load_8 PDForm:$src), (PLBZ memri34:$src)>;
+  def : Pat<(atomic_load_16 PDForm:$src), (PLHZ memri34:$src)>;
+  def : Pat<(atomic_load_32 PDForm:$src), (PLWZ memri34:$src)>;
+  def : Pat<(atomic_load_64 PDForm:$src), (PLD memri34:$src)>;
+
+  // Atomic Store
+  def : Pat<(atomic_store_8 PDForm:$dst, i32:$RS), (PSTB $RS, memri34:$dst)>;
+  def : Pat<(atomic_store_16 PDForm:$dst, i32:$RS), (PSTH $RS, memri34:$dst)>;
+  def : Pat<(atomic_store_32 PDForm:$dst, i32:$RS), (PSTW $RS, memri34:$dst)>;
+  def : Pat<(atomic_store_64 PDForm:$dst, i64:$RS), (PSTD $RS, memri34:$dst)>;
 }
 

llvm/test/CodeGen/PowerPC/mma-acc-memops.ll

 ; LE-PAIRED-NEXT:    pstxv vs1, f@PCREL+51(0), 1
 ; LE-PAIRED-NEXT:    pstxv vs2, f@PCREL+35(0), 1
 ; LE-PAIRED-NEXT:    pstxv vs3, f@PCREL+19(0), 1
 ; LE-PAIRED-NEXT:    blr
 ;
 ; BE-PAIRED-LABEL: testUnalignedLdSt:
 ; BE-PAIRED:       # %bb.0: # %entry
 ; BE-PAIRED-NEXT:    addis r3, r2, f@toc@ha
-; BE-PAIRED-NEXT:    li r4, 11
 ; BE-PAIRED-NEXT:    addi r3, r3, f@toc@l
-; BE-PAIRED-NEXT:    lxvx vs0, r3, r4
-; BE-PAIRED-NEXT:    li r4, 27
-; BE-PAIRED-NEXT:    lxvx vs1, r3, r4
-; BE-PAIRED-NEXT:    li r4, 43
-; BE-PAIRED-NEXT:    lxvx vs2, r3, r4
-; BE-PAIRED-NEXT:    li r4, 59
-; BE-PAIRED-NEXT:    lxvx vs3, r3, r4
-; BE-PAIRED-NEXT:    li r4, 35
-; BE-PAIRED-NEXT:    stxvx vs1, r3, r4
-; BE-PAIRED-NEXT:    li r4, 19
-; BE-PAIRED-NEXT:    stxvx vs0, r3, r4
-; BE-PAIRED-NEXT:    li r4, 67
-; BE-PAIRED-NEXT:    stxvx vs3, r3, r4
-; BE-PAIRED-NEXT:    li r4, 51
-; BE-PAIRED-NEXT:    stxvx vs2, r3, r4
+; BE-PAIRED-NEXT:    plxv vs1, 27(r3), 0
+; BE-PAIRED-NEXT:    plxv vs0, 11(r3), 0
+; BE-PAIRED-NEXT:    plxv vs3, 59(r3), 0
+; BE-PAIRED-NEXT:    plxv vs2, 43(r3), 0
+; BE-PAIRED-NEXT:    pstxv vs1, 35(r3), 0
+; BE-PAIRED-NEXT:    pstxv vs0, 19(r3), 0
+; BE-PAIRED-NEXT:    pstxv vs3, 67(r3), 0
+; BE-PAIRED-NEXT:    pstxv vs2, 51(r3), 0
 ; BE-PAIRED-NEXT:    blr
 entry:
   %0 = bitcast <512 x i1>* @f to i8*
   %add.ptr = getelementptr inbounds i8, i8* %0, i64 11
   %add.ptr1 = getelementptr inbounds i8, i8* %0, i64 19
   %1 = bitcast i8* %add.ptr to <512 x i1>*
   %2 = bitcast i8* %add.ptr1 to <512 x i1>*
   %3 = load <512 x i1>, <512 x i1>* %1, align 64

 ; LE-PAIRED-NEXT:    plxv vs0, g@PCREL+27(0), 1
 ; LE-PAIRED-NEXT:    pstxv vs1, g@PCREL+19(0), 1
 ; LE-PAIRED-NEXT:    pstxv vs0, g@PCREL+35(0), 1
 ; LE-PAIRED-NEXT:    blr
 ;
 ; BE-PAIRED-LABEL: testUnalignedLdStPair:
 ; BE-PAIRED:       # %bb.0: # %entry
 ; BE-PAIRED-NEXT:    addis r3, r2, g@toc@ha
-; BE-PAIRED-NEXT:    li r4, 11
 ; BE-PAIRED-NEXT:    addi r3, r3, g@toc@l
-; BE-PAIRED-NEXT:    lxvx vs0, r3, r4
-; BE-PAIRED-NEXT:    li r4, 27
-; BE-PAIRED-NEXT:    lxvx vs1, r3, r4
-; BE-PAIRED-NEXT:    li r4, 35
-; BE-PAIRED-NEXT:    stxvx vs1, r3, r4
-; BE-PAIRED-NEXT:    li r4, 19
-; BE-PAIRED-NEXT:    stxvx vs0, r3, r4
+; BE-PAIRED-NEXT:    plxv vs1, 27(r3), 0
+; BE-PAIRED-NEXT:    plxv vs0, 11(r3), 0
+; BE-PAIRED-NEXT:    pstxv vs1, 35(r3), 0
+; BE-PAIRED-NEXT:    pstxv vs0, 19(r3), 0
 ; BE-PAIRED-NEXT:    blr
 entry:
   %0 = bitcast <256 x i1>* @g to i8*
   %add.ptr = getelementptr inbounds i8, i8* %0, i64 11
   %add.ptr1 = getelementptr inbounds i8, i8* %0, i64 19
   %1 = bitcast i8* %add.ptr to <256 x i1>*
   %2 = bitcast i8* %add.ptr1 to <256 x i1>*
   %3 = load <256 x i1>, <256 x i1>* %1, align 64
   store <256 x i1> %3, <256 x i1>* %2, align 64
   ret void
 }

llvm/test/CodeGen/PowerPC/mma-intrinsics.ll

 ; Function Attrs: nofree nounwind
 define void @test_ldst_1(i8* nocapture readonly %vqp, <256 x i1>* %vpp, <16 x i8> %vc, i8* nocapture %resp)  {
 ; CHECK-LABEL: test_ldst_1:
 ; CHECK:       # %bb.0: # %entry
 ; CHECK-NEXT:    lxv vs1, 32(r3)
 ; CHECK-NEXT:    lxv vs0, 48(r3)
 ; CHECK-NEXT:    lxv vs3, 0(r3)
 ; CHECK-NEXT:    lxv vs2, 16(r3)
-; CHECK-NEXT:    li r3, 8
-; CHECK-NEXT:    lxvpx vsp4, r4, r3
+; CHECK-NEXT:    plxvp vsp4, 8(r4), 0
 ; CHECK-NEXT:    xxmtacc acc0
 ; CHECK-NEXT:    pmxvf64gernn acc0, vsp4, v2, 0, 0
 ; CHECK-NEXT:    xxmfacc acc0
 ; CHECK-NEXT:    stxv vs0, 48(r7)
 ; CHECK-NEXT:    stxv vs1, 32(r7)
 ; CHECK-NEXT:    stxv vs2, 16(r7)
 ; CHECK-NEXT:    stxv vs3, 0(r7)
 ; CHECK-NEXT:    blr
 ;
 ; CHECK-BE-LABEL: test_ldst_1:
 ; CHECK-BE:       # %bb.0: # %entry
 ; CHECK-BE-NEXT:    lxv vs1, 16(r3)
 ; CHECK-BE-NEXT:    lxv vs0, 0(r3)
 ; CHECK-BE-NEXT:    lxv vs3, 48(r3)
 ; CHECK-BE-NEXT:    lxv vs2, 32(r3)
-; CHECK-BE-NEXT:    li r3, 8
-; CHECK-BE-NEXT:    lxvpx vsp4, r4, r3
+; CHECK-BE-NEXT:    plxvp vsp4, 8(r4), 0
 ; CHECK-BE-NEXT:    xxmtacc acc0
 ; CHECK-BE-NEXT:    pmxvf64gernn acc0, vsp4, v2, 0, 0
 ; CHECK-BE-NEXT:    xxmfacc acc0
 ; CHECK-BE-NEXT:    stxv vs1, 16(r7)
 ; CHECK-BE-NEXT:    stxv vs0, 0(r7)
 ; CHECK-BE-NEXT:    stxv vs3, 48(r7)
 ; CHECK-BE-NEXT:    stxv vs2, 32(r7)
 ; CHECK-BE-NEXT:    blr

llvm/test/CodeGen/PowerPC/paired-vector-intrinsics.ll

entry:
   %4 = getelementptr i8, i8* %3, i64 %offset
   tail call void @llvm.ppc.vsx.stxvp(<256 x i1> %2, i8* %4)
   ret void
 }
 
 define void @test_ldst_3(<256 x i1>* %vpp, <256 x i1>* %vp2)  {
 ; CHECK-LABEL: test_ldst_3:
 ; CHECK:       # %bb.0: # %entry
-; CHECK-NEXT:    li r5, 18
-; CHECK-NEXT:    lxvpx vsp0, r3, r5
-; CHECK-NEXT:    stxvpx vsp0, r4, r5
+; CHECK-NEXT:    plxvp vsp0, 18(r3), 0
+; CHECK-NEXT:    pstxvp vsp0, 18(r4), 0
 ; CHECK-NEXT:    blr
 ;
 ; CHECK-NOMMA-LABEL: test_ldst_3:
 ; CHECK-NOMMA:       # %bb.0: # %entry
-; CHECK-NOMMA-NEXT:    li r5, 18
-; CHECK-NOMMA-NEXT:    lxvpx vsp0, r3, r5
-; CHECK-NOMMA-NEXT:    stxvpx vsp0, r4, r5
+; CHECK-NOMMA-NEXT:    plxvp vsp0, 18(r3), 0
+; CHECK-NOMMA-NEXT:    pstxvp vsp0, 18(r4), 0
 ; CHECK-NOMMA-NEXT:    blr
 ;
 ; CHECK-BE-LABEL: test_ldst_3:
 ; CHECK-BE:       # %bb.0: # %entry
-; CHECK-BE-NEXT:    li r5, 18
-; CHECK-BE-NEXT:    lxvpx vsp0, r3, r5
-; CHECK-BE-NEXT:    stxvpx vsp0, r4, r5
+; CHECK-BE-NEXT:    plxvp vsp0, 18(r3), 0
+; CHECK-BE-NEXT:    pstxvp vsp0, 18(r4), 0
 ; CHECK-BE-NEXT:    blr
 ;
 ; CHECK-BE-NOMMA-LABEL: test_ldst_3:
 ; CHECK-BE-NOMMA:       # %bb.0: # %entry
-; CHECK-BE-NOMMA-NEXT:    li r5, 18
-; CHECK-BE-NOMMA-NEXT:    lxvpx vsp0, r3, r5
-; CHECK-BE-NOMMA-NEXT:    stxvpx vsp0, r4, r5
+; CHECK-BE-NOMMA-NEXT:    plxvp vsp0, 18(r3), 0
+; CHECK-BE-NOMMA-NEXT:    pstxvp vsp0, 18(r4), 0
 ; CHECK-BE-NOMMA-NEXT:    blr
 entry:
   %0 = bitcast <256 x i1>* %vpp to i8*
   %1 = getelementptr i8, i8* %0, i64 18
   %2 = tail call <256 x i1> @llvm.ppc.vsx.lxvp(i8* %1)
   %3 = bitcast <256 x i1>* %vp2 to i8*
   %4 = getelementptr i8, i8* %3, i64 18
   tail call void @llvm.ppc.vsx.stxvp(<256 x i1> %2, i8* %4)
   ret void
 }
 
 define void @test_ldst_4(<256 x i1>* %vpp, <256 x i1>* %vp2)  {
 ; CHECK-LABEL: test_ldst_4:
 ; CHECK:       # %bb.0: # %entry
-; CHECK-NEXT:    li r5, 1
-; CHECK-NEXT:    lxvpx vsp0, r3, r5
-; CHECK-NEXT:    stxvpx vsp0, r4, r5
+; CHECK-NEXT:    plxvp vsp0, 1(r3), 0
+; CHECK-NEXT:    pstxvp vsp0, 1(r4), 0
 ; CHECK-NEXT:    blr
 ;
 ; CHECK-NOMMA-LABEL: test_ldst_4:
 ; CHECK-NOMMA:       # %bb.0: # %entry
-; CHECK-NOMMA-NEXT:    li r5, 1
-; CHECK-NOMMA-NEXT:    lxvpx vsp0, r3, r5
-; CHECK-NOMMA-NEXT:    stxvpx vsp0, r4, r5
+; CHECK-NOMMA-NEXT:    plxvp vsp0, 1(r3), 0
+; CHECK-NOMMA-NEXT:    pstxvp vsp0, 1(r4), 0
 ; CHECK-NOMMA-NEXT:    blr
 ;
 ; CHECK-BE-LABEL: test_ldst_4:
 ; CHECK-BE:       # %bb.0: # %entry
-; CHECK-BE-NEXT:    li r5, 1
-; CHECK-BE-NEXT:    lxvpx vsp0, r3, r5
-; CHECK-BE-NEXT:    stxvpx vsp0, r4, r5
+; CHECK-BE-NEXT:    plxvp vsp0, 1(r3), 0
+; CHECK-BE-NEXT:    pstxvp vsp0, 1(r4), 0
 ; CHECK-BE-NEXT:    blr
 ;
 ; CHECK-BE-NOMMA-LABEL: test_ldst_4:
 ; CHECK-BE-NOMMA:       # %bb.0: # %entry
-; CHECK-BE-NOMMA-NEXT:    li r5, 1
-; CHECK-BE-NOMMA-NEXT:    lxvpx vsp0, r3, r5
-; CHECK-BE-NOMMA-NEXT:    stxvpx vsp0, r4, r5
+; CHECK-BE-NOMMA-NEXT:    plxvp vsp0, 1(r3), 0
+; CHECK-BE-NOMMA-NEXT:    pstxvp vsp0, 1(r4), 0
 ; CHECK-BE-NOMMA-NEXT:    blr
 entry:
   %0 = bitcast <256 x i1>* %vpp to i8*
   %1 = getelementptr i8, i8* %0, i64 1
   %2 = tail call <256 x i1> @llvm.ppc.vsx.lxvp(i8* %1)
   %3 = bitcast <256 x i1>* %vp2 to i8*
   %4 = getelementptr i8, i8* %3, i64 1
   tail call void @llvm.ppc.vsx.stxvp(<256 x i1> %2, i8* %4)
   ret void
 }
 
 define void @test_ldst_5(<256 x i1>* %vpp, <256 x i1>* %vp2)  {
 ; CHECK-LABEL: test_ldst_5:
 ; CHECK:       # %bb.0: # %entry
-; CHECK-NEXT:    li r5, 42
-; CHECK-NEXT:    lxvpx vsp0, r3, r5
-; CHECK-NEXT:    stxvpx vsp0, r4, r5
+; CHECK-NEXT:    plxvp vsp0, 42(r3), 0
+; CHECK-NEXT:    pstxvp vsp0, 42(r4), 0
 ; CHECK-NEXT:    blr
 ;
 ; CHECK-NOMMA-LABEL: test_ldst_5:
 ; CHECK-NOMMA:       # %bb.0: # %entry
-; CHECK-NOMMA-NEXT:    li r5, 42
-; CHECK-NOMMA-NEXT:    lxvpx vsp0, r3, r5
-; CHECK-NOMMA-NEXT:    stxvpx vsp0, r4, r5
+; CHECK-NOMMA-NEXT:    plxvp vsp0, 42(r3), 0
+; CHECK-NOMMA-NEXT:    pstxvp vsp0, 42(r4), 0
 ; CHECK-NOMMA-NEXT:    blr
 ;
 ; CHECK-BE-LABEL: test_ldst_5:
 ; CHECK-BE:       # %bb.0: # %entry
-; CHECK-BE-NEXT:    li r5, 42
-; CHECK-BE-NEXT:    lxvpx vsp0, r3, r5
-; CHECK-BE-NEXT:    stxvpx vsp0, r4, r5
+; CHECK-BE-NEXT:    plxvp vsp0, 42(r3), 0
+; CHECK-BE-NEXT:    pstxvp vsp0, 42(r4), 0
 ; CHECK-BE-NEXT:    blr
 ;
 ; CHECK-BE-NOMMA-LABEL: test_ldst_5:
 ; CHECK-BE-NOMMA:       # %bb.0: # %entry
-; CHECK-BE-NOMMA-NEXT:    li r5, 42
-; CHECK-BE-NOMMA-NEXT:    lxvpx vsp0, r3, r5
-; CHECK-BE-NOMMA-NEXT:    stxvpx vsp0, r4, r5
+; CHECK-BE-NOMMA-NEXT:    plxvp vsp0, 42(r3), 0
+; CHECK-BE-NOMMA-NEXT:    pstxvp vsp0, 42(r4), 0
 ; CHECK-BE-NOMMA-NEXT:    blr
 entry:
   %0 = bitcast <256 x i1>* %vpp to i8*
   %1 = getelementptr i8, i8* %0, i64 42
   %2 = tail call <256 x i1> @llvm.ppc.vsx.lxvp(i8* %1)
   %3 = bitcast <256 x i1>* %vp2 to i8*
   %4 = getelementptr i8, i8* %3, i64 42
   tail call void @llvm.ppc.vsx.stxvp(<256 x i1> %2, i8* %4)
entry:
   %2 = tail call <256 x i1> @llvm.ppc.vsx.lxvp(i8* %1)
   %3 = getelementptr <256 x i1>, <256 x i1>* %vp2, i64 128
   %4 = bitcast <256 x i1>* %3 to i8*
   tail call void @llvm.ppc.vsx.stxvp(<256 x i1> %2, i8* %4)
   ret void
 }
 
 define void @test_ldst_7(<256 x i1>* %vpp, <256 x i1>* %vp2)  {
-; FIXME: A prefixed load (plxvp) is expected here as the offset in this
-; test case is a constant that fits within 34-bits.
 ; CHECK-LABEL: test_ldst_7:
 ; CHECK:       # %bb.0: # %entry
-; CHECK-NEXT:    pli r5, 32799
+; CHECK-NEXT:    plxvp vsp0, 32799(r3), 0
+; CHECK-NEXT:    pstxvp vsp0, 32799(r4), 0
+; CHECK-NEXT:    blr
+;
+; CHECK-NOMMA-LABEL: test_ldst_7:
+; CHECK-NOMMA:       # %bb.0: # %entry
+; CHECK-NOMMA-NEXT:    plxvp vsp0, 32799(r3), 0
+; CHECK-NOMMA-NEXT:    pstxvp vsp0, 32799(r4), 0
+; CHECK-NOMMA-NEXT:    blr
+;
+; CHECK-BE-LABEL: test_ldst_7:
+; CHECK-BE:       # %bb.0: # %entry
+; CHECK-BE-NEXT:    plxvp vsp0, 32799(r3), 0
+; CHECK-BE-NEXT:    pstxvp vsp0, 32799(r4), 0
+; CHECK-BE-NEXT:    blr
+;
+; CHECK-BE-NOMMA-LABEL: test_ldst_7:
+; CHECK-BE-NOMMA:       # %bb.0: # %entry
+; CHECK-BE-NOMMA-NEXT:    plxvp vsp0, 32799(r3), 0
+; CHECK-BE-NOMMA-NEXT:    pstxvp vsp0, 32799(r4), 0
+; CHECK-BE-NOMMA-NEXT:    blr
+entry:
+  %0 = bitcast <256 x i1>* %vpp to i8*
+  %1 = getelementptr i8, i8* %0, i64 32799
+  %2 = tail call <256 x i1> @llvm.ppc.vsx.lxvp(i8* %1)
+  %3 = bitcast <256 x i1>* %vp2 to i8*
+  %4 = getelementptr i8, i8* %3, i64 32799
+  tail call void @llvm.ppc.vsx.stxvp(<256 x i1> %2, i8* %4)
+  ret void
+}
+
+define void @test_ldst_8(<256 x i1>* %vpp, <256 x i1>* %vp2)  {
+; CHECK-LABEL: test_ldst_8:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    lis r5, -27390
+; CHECK-NEXT:    ori r5, r5, 63743
+; CHECK-NEXT:    rldicl r5, r5, 2, 30
 ; CHECK-NEXT:    lxvpx vsp0, r3, r5
 ; CHECK-NEXT:    stxvpx vsp0, r4, r5
 ; CHECK-NEXT:    blr
 ;
-; CHECK-NOMMA-LABEL: test_ldst_7:
+; CHECK-NOMMA-LABEL: test_ldst_8:
 ; CHECK-NOMMA:       # %bb.0: # %entry
-; CHECK-NOMMA-NEXT:    pli r5, 32799
+; CHECK-NOMMA-NEXT:    lis r5, -27390
+; CHECK-NOMMA-NEXT:    ori r5, r5, 63743
+; CHECK-NOMMA-NEXT:    rldicl r5, r5, 2, 30
 ; CHECK-NOMMA-NEXT:    lxvpx vsp0, r3, r5
 ; CHECK-NOMMA-NEXT:    stxvpx vsp0, r4, r5
 ; CHECK-NOMMA-NEXT:    blr
 ;
-; CHECK-BE-LABEL: test_ldst_7:
+; CHECK-BE-LABEL: test_ldst_8:
 ; CHECK-BE:       # %bb.0: # %entry
-; CHECK-BE-NEXT:    pli r5, 32799
+; CHECK-BE-NEXT:    lis r5, -27390
+; CHECK-BE-NEXT:    ori r5, r5, 63743
+; CHECK-BE-NEXT:    rldicl r5, r5, 2, 30
 ; CHECK-BE-NEXT:    lxvpx vsp0, r3, r5
 ; CHECK-BE-NEXT:    stxvpx vsp0, r4, r5
 ; CHECK-BE-NEXT:    blr
 ;
-; CHECK-BE-NOMMA-LABEL: test_ldst_7:
+; CHECK-BE-NOMMA-LABEL: test_ldst_8:
 ; CHECK-BE-NOMMA:       # %bb.0: # %entry
-; CHECK-BE-NOMMA-NEXT:    pli r5, 32799
+; CHECK-BE-NOMMA-NEXT:    lis r5, -27390
+; CHECK-BE-NOMMA-NEXT:    ori r5, r5, 63743
+; CHECK-BE-NOMMA-NEXT:    rldicl r5, r5, 2, 30
 ; CHECK-BE-NOMMA-NEXT:    lxvpx vsp0, r3, r5
 ; CHECK-BE-NOMMA-NEXT:    stxvpx vsp0, r4, r5
 ; CHECK-BE-NOMMA-NEXT:    blr
 entry:
   %0 = bitcast <256 x i1>* %vpp to i8*
-  %1 = getelementptr i8, i8* %0, i64 32799
+  %1 = getelementptr i8, i8* %0, i64 9999999999
   %2 = tail call <256 x i1> @llvm.ppc.vsx.lxvp(i8* %1)
   %3 = bitcast <256 x i1>* %vp2 to i8*
-  %4 = getelementptr i8, i8* %3, i64 32799
+  %4 = getelementptr i8, i8* %3, i64 9999999999
   tail call void @llvm.ppc.vsx.stxvp(<256 x i1> %2, i8* %4)
   ret void
 }

llvm/test/CodeGen/PowerPC/prefixed-ld-st-atomics.ll

+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -verify-machineinstrs -mtriple=powerpc64le-unknown-linux-gnu -O3 \
+; RUN:     -mcpu=pwr10 -ppc-asm-full-reg-names -ppc-vsr-nums-as-vr \
+; RUN:     < %s | FileCheck %s
+; RUN: llc -verify-machineinstrs -mtriple=powerpc64-unknown-linux-gnu -O3 \
+; RUN:     -mcpu=pwr10 -ppc-asm-full-reg-names -ppc-vsr-nums-as-vr \
+; RUN:     < %s | FileCheck %s
+
+; Atomic Loads and Stores
+define zeroext i8 @atomic_load_i8(i8* nocapture readonly %ptr) {
+; CHECK-LABEL: atomic_load_i8:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plbz r3, 4294967297(r3), 0
+; CHECK-NEXT:    clrldi r3, r3, 56
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = load atomic i8, i8* %add.ptr monotonic, align 1
+  ret i8 %0
+}
+
+define signext i16 @atomic_load_i16(i8* nocapture readonly %ptr) {
+; CHECK-LABEL: atomic_load_i16:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plhz r3, 4294967297(r3), 0
+; CHECK-NEXT:    extsh r3, r3
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to i16*
+  %1 = load atomic i16, i16* %0 monotonic, align 2
+  ret i16 %1
+}
+
+define signext i32 @atomic_load_i32(i8* nocapture readonly %ptr) {
+; CHECK-LABEL: atomic_load_i32:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plwz r3, 4294967297(r3), 0
+; CHECK-NEXT:    extsw r3, r3
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to i32*
+  %1 = load atomic i32, i32* %0 monotonic, align 4
+  ret i32 %1
+}
+
+define i64 @atomic_load_i64(i8* nocapture readonly %ptr) {
+; CHECK-LABEL: atomic_load_i64:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pld r3, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to i64*
+  %1 = load atomic i64, i64* %0 monotonic, align 8
+  ret i64 %1
+}
+
+define void @atomic_store_i8_i32(i8* nocapture %ptr, i8 zeroext %str) {
+; CHECK-LABEL: atomic_store_i8_i32:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pstb r4, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  store atomic i8 %str, i8* %add.ptr monotonic, align 1
+  ret void
+}
+
+define void @atomic_store_i16_i32(i8* nocapture %ptr, i16 signext %str) {
+; CHECK-LABEL: atomic_store_i16_i32:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    psth r4, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to i16*
+  store atomic i16 %str, i16* %0 monotonic, align 2
+  ret void
+}
+
+define void @atomic_store_i32_i32(i8* nocapture %ptr, i32 signext %str) {
+; CHECK-LABEL: atomic_store_i32_i32:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pstw r4, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to i32*
+  store atomic i32 %str, i32* %0 monotonic, align 4
+  ret void
+}
+
+define void @atomic_store_i64(i8* nocapture %ptr, i64 %str) {
+; CHECK-LABEL: atomic_store_i64:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pstd r4, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to i64*
+  store atomic i64 %str, i64* %0 monotonic, align 8
+  ret void
+}
+

llvm/test/CodeGen/PowerPC/prefixed-ld-st-constants.ll

+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -verify-machineinstrs -mtriple=powerpc64le-unknown-linux-gnu -O3 \
+; RUN:     -mcpu=pwr10 -ppc-asm-full-reg-names -ppc-vsr-nums-as-vr \
+; RUN:     < %s | FileCheck %s
+; RUN: llc -verify-machineinstrs -mtriple=powerpc64-unknown-linux-gnu -O3 \
+; RUN:     -mcpu=pwr10 -ppc-asm-full-reg-names -ppc-vsr-nums-as-vr \
+; RUN:     < %s | FileCheck %s
+
+; i32 tests: loading, storing a constant address
+define void @extload_i8_i32_cst(i8* nocapture %St) {
+; CHECK-LABEL: extload_i8_i32_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plbz r4, 4294967297(0), 0
+; CHECK-NEXT:    pstb r4, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = load i8, i8* inttoptr (i64 4294967297 to i8*), align 1
+  %add.ptr = getelementptr inbounds i8, i8* %St, i64 4294967297
+  store i8 %0, i8* %add.ptr, align 1
+  ret void
+}
+
+define void @store_i8_i32_cst(i8* nocapture readonly %Ld) {
+; CHECK-LABEL: store_i8_i32_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plbz r3, 4294967297(r3), 0
+; CHECK-NEXT:    pstb r3, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %Ld, i64 4294967297
+  %0 = load i8, i8* %add.ptr, align 1
+  store i8 %0, i8* inttoptr (i64 4294967297 to i8*), align 1
+  ret void
+}
+
+define void @zextload_i8_i32_cst(i32* nocapture %St) {
+; CHECK-LABEL: zextload_i8_i32_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plbz r4, 4294967297(0), 0
+; CHECK-NEXT:    pstw r4, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = load i8, i8* inttoptr (i64 4294967297 to i8*), align 1
+  %conv = zext i8 %0 to i32
+  %1 = bitcast i32* %St to i8*
+  %add.ptr = getelementptr inbounds i8, i8* %1, i64 4294967297
+  %2 = bitcast i8* %add.ptr to i32*
+  store i32 %conv, i32* %2, align 4
+  ret void
+}
+
+define void @extload_i16_i32_cst(i16* nocapture %St) {
+; CHECK-LABEL: extload_i16_i32_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plhz r4, 4294967297(0), 0
+; CHECK-NEXT:    psth r4, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = load i16, i16* inttoptr (i64 4294967297 to i16*), align 2
+  %1 = bitcast i16* %St to i8*
+  %add.ptr = getelementptr inbounds i8, i8* %1, i64 4294967297
+  %2 = bitcast i8* %add.ptr to i16*
+  store i16 %0, i16* %2, align 2
+  ret void
+}
+
+define void @store_i16_i32_cst(i16* nocapture readonly %Ld) {
+; CHECK-LABEL: store_i16_i32_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plhz r3, 4294967297(r3), 0
+; CHECK-NEXT:    psth r3, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = bitcast i16* %Ld to i8*
+  %add.ptr = getelementptr inbounds i8, i8* %0, i64 4294967297
+  %1 = bitcast i8* %add.ptr to i16*
+  %2 = load i16, i16* %1, align 2
+  store i16 %2, i16* inttoptr (i64 4294967297 to i16*), align 2
+  ret void
+}
+
+define void @zextload_i16_i32_cst(i32* nocapture %St) {
+; CHECK-LABEL: zextload_i16_i32_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plhz r4, 4294967297(0), 0
+; CHECK-NEXT:    pstw r4, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = load i16, i16* inttoptr (i64 4294967297 to i16*), align 2
+  %conv = zext i16 %0 to i32
+  %1 = bitcast i32* %St to i8*
+  %add.ptr = getelementptr inbounds i8, i8* %1, i64 4294967297
+  %2 = bitcast i8* %add.ptr to i32*
+  store i32 %conv, i32* %2, align 4
+  ret void
+}
+
+define void @sextload_i16_i32_cst(i32* nocapture %St) {
+; CHECK-LABEL: sextload_i16_i32_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plha r4, 4294967297(0), 0
+; CHECK-NEXT:    pstw r4, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = load i16, i16* inttoptr (i64 4294967297 to i16*), align 2
+  %conv = sext i16 %0 to i32
+  %1 = bitcast i32* %St to i8*
+  %add.ptr = getelementptr inbounds i8, i8* %1, i64 4294967297
+  %2 = bitcast i8* %add.ptr to i32*
+  store i32 %conv, i32* %2, align 4
+  ret void
+}
+
+define void @load_i32_cst(i32* nocapture %St) {
+; CHECK-LABEL: load_i32_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plwz r4, 4294967297(0), 0
+; CHECK-NEXT:    pstw r4, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = load i32, i32* inttoptr (i64 4294967297 to i32*), align 4
+  %1 = bitcast i32* %St to i8*
+  %add.ptr = getelementptr inbounds i8, i8* %1, i64 4294967297
+  %2 = bitcast i8* %add.ptr to i32*
+  store i32 %0, i32* %2, align 4
+  ret void
+}
+
+define void @store_i32_cst(i32* nocapture readonly %Ld) {
+; CHECK-LABEL: store_i32_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plwz r3, 4294967297(r3), 0
+; CHECK-NEXT:    pstw r3, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = bitcast i32* %Ld to i8*
+  %add.ptr = getelementptr inbounds i8, i8* %0, i64 4294967297
+  %1 = bitcast i8* %add.ptr to i32*
+  %2 = load i32, i32* %1, align 4
+  store i32 %2, i32* inttoptr (i64 4294967297 to i32*), align 4
+  ret void
+}
+
+; i64 tests: loading a constant address
+define signext i8 @extload_i8_i64_cst() {
+; CHECK-LABEL: extload_i8_i64_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plbz r3, 4294967297(0), 0
+; CHECK-NEXT:    extsb r3, r3
+; CHECK-NEXT:    blr
+entry:
+  %0 = load i8, i8* inttoptr (i64 4294967297 to i8*), align 1
+  ret i8 %0
+}
+
+define zeroext i8 @zextload_i8_i64_cst() {
+; CHECK-LABEL: zextload_i8_i64_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plbz r3, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = load i8, i8* inttoptr (i64 4294967297 to i8*), align 1
+  ret i8 %0
+}
+
+define i16 @extload_i16_i64_cst() {
+; CHECK-LABEL: extload_i16_i64_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plhz r3, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = load i16, i16* inttoptr (i64 4294967297 to i16*), align 2
+  ret i16 %0
+}
+
+define zeroext i16 @zextload_i16_i64_cst() {
+; CHECK-LABEL: zextload_i16_i64_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plhz r3, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = load i16, i16* inttoptr (i64 4294967297 to i16*), align 2
+  ret i16 %0
+}
+
+define signext i16 @sextload_i16_i64_cst() {
+; CHECK-LABEL: sextload_i16_i64_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plha r3, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = load i16, i16* inttoptr (i64 4294967297 to i16*), align 2
+  ret i16 %0
+}
+
+define i32 @extload_i32_i64_cst() {
+; CHECK-LABEL: extload_i32_i64_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plwz r3, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = load i32, i32* inttoptr (i64 4294967297 to i32*), align 4
+  ret i32 %0
+}
+
+define zeroext i32 @zextload_i32_i64_cst() {
+; CHECK-LABEL: zextload_i32_i64_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plwz r3, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = load i32, i32* inttoptr (i64 4294967297 to i32*), align 4
+  ret i32 %0
+}
+
+define signext i32 @sextload_i32_i64_cst() {
+; CHECK-LABEL: sextload_i32_i64_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plwa r3, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = load i32, i32* inttoptr (i64 4294967297 to i32*), align 4
+  ret i32 %0
+}
+
+define i64 @load_i64_cst() {
+; CHECK-LABEL: load_i64_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pld r3, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = load i64, i64* inttoptr (i64 4294967297 to i64*), align 8
+  ret i64 %0
+}
+
+define void @store_i8_i64_cst(i8 zeroext %str) {
+; CHECK-LABEL: store_i8_i64_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pstb r3, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  store i8 %str, i8* inttoptr (i64 4294967297 to i8*), align 1
+  ret void
+}
+
+define void @store_i16_i64_cst(i16 zeroext %str) {
+; CHECK-LABEL: store_i16_i64_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    psth r3, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  store i16 %str, i16* inttoptr (i64 4294967297 to i16*), align 2
+  ret void
+}
+
+define void @store_i32_i64_cst(i32 zeroext %str) {
+; CHECK-LABEL: store_i32_i64_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pstw r3, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  store i32 %str, i32* inttoptr (i64 4294967297 to i32*), align 4
+  ret void
+}
+
+define void @store_i64_cst(i64 %str) {
+; CHECK-LABEL: store_i64_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pstd r3, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  store i64 %str, i64* inttoptr (i64 4294967297 to i64*), align 8
+  ret void
+}
+
+; float, double, f128: loading a constant address
+define float @load_float_cst() {
+; CHECK-LABEL: load_float_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plfs f1, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = load float, float* inttoptr (i64 4294967297 to float*), align 4
+  ret float %0
+}
+
+define double @extload_float_cst() {
+; CHECK-LABEL: extload_float_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pli r3, 4294967297
+; CHECK-NEXT:    plfs f1, r3(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = load float, float* inttoptr (i64 4294967297 to float*), align 4
+  %conv = fpext float %0 to double
+  ret double %conv
+}
+
+define double @load_double_cst() {
+; CHECK-LABEL: load_double_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plfd f1, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = load double, double* inttoptr (i64 4294967297 to double*), align 8
+  ret double %0
+}
+
+define void @store_float_cst(float %str) {
+; CHECK-LABEL: store_float_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pstfs f1, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  store float %str, float* inttoptr (i64 4294967297 to float*), align 4
+  ret void
+}
+
+define void @store_double_cst(double %str) {
+; CHECK-LABEL: store_double_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pstfd f1, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  store double %str, double* inttoptr (i64 4294967297 to double*), align 8
+  ret void
+}
+
+define fp128 @load_f128_cst() {
+; CHECK-LABEL: load_f128_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plxv v2, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = load fp128, fp128* inttoptr (i64 4294967297 to fp128*), align 16
+  ret fp128 %0
+}
+
+define void @store_f128_cst(fp128 %str) {
+; CHECK-LABEL: store_f128_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pstxv v2, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  store fp128 %str, fp128* inttoptr (i64 4294967297 to fp128*), align 16
+  ret void
+}
+
+define void @store_double_fp_to_uint_cst(double %str) {
+; CHECK-LABEL: store_double_fp_to_uint_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    xscvdpuxds v2, f1
+; CHECK-NEXT:    pli r3, 4294967297
+; CHECK-NEXT:    pstxsd v2, r3(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %conv = fptoui double %str to i64
+  store i64 %conv, i64* inttoptr (i64 4294967297 to i64*), align 8
+  ret void
+}
+
+define void @store_double_fp_to_int_cst(double %str) {
+; CHECK-LABEL: store_double_fp_to_int_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    xscvdpsxds v2, f1
+; CHECK-NEXT:    pli r3, 4294967297
+; CHECK-NEXT:    pstxsd v2, r3(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %conv = fptosi double %str to i64
+  store i64 %conv, i64* inttoptr (i64 4294967297 to i64*), align 8
+  ret void
+}
+
+define void @store_f128_fp_to_uint_cst(fp128 %str) {
+; CHECK-LABEL: store_f128_fp_to_uint_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    xscvqpudz v2, v2
+; CHECK-NEXT:    pli r3, 4294967297
+; CHECK-NEXT:    pstxsd v2, r3(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %conv = fptoui fp128 %str to i64
+  store i64 %conv, i64* inttoptr (i64 4294967297 to i64*), align 8
+  ret void
+}
+
+define void @store_f128_fp_to_int_cst(fp128 %str) {
+; CHECK-LABEL: store_f128_fp_to_int_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    xscvqpsdz v2, v2
+; CHECK-NEXT:    pli r3, 4294967297
+; CHECK-NEXT:    pstxsd v2, r3(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %conv = fptosi fp128 %str to i64
+  store i64 %conv, i64* inttoptr (i64 4294967297 to i64*), align 8
+  ret void
+}
+
+; v4i32, v2i64, v4f32, v2f64: loading a constant address
+define <4 x i32> @load_v4i32_cst() {
+; CHECK-LABEL: load_v4i32_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plxv v2, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = load <4 x i32>, <4 x i32>* inttoptr (i64 4294967297 to <4 x i32>*), align 16
+  ret <4 x i32> %0
+}
+
+define void @store_v4i32_cst(<4 x i32> %str) {
+; CHECK-LABEL: store_v4i32_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pstxv v2, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  store <4 x i32> %str, <4 x i32>* inttoptr (i64 4294967297 to <4 x i32>*), align 16
+  ret void
+}
+
+define <2 x i64> @load_v2i64_cst() {
+; CHECK-LABEL: load_v2i64_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plxv v2, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = load <2 x i64>, <2 x i64>* inttoptr (i64 4294967297 to <2 x i64>*), align 16
+  ret <2 x i64> %0
+}
+
+define void @store_v2i64_cst(<2 x i64> %str) {
+; CHECK-LABEL: store_v2i64_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pstxv v2, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  store <2 x i64> %str, <2 x i64>* inttoptr (i64 4294967297 to <2 x i64>*), align 16
+  ret void
+}
+
+define <4 x float> @load_v4f32_cst() {
+; CHECK-LABEL: load_v4f32_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plxv v2, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = load <4 x float>, <4 x float>* inttoptr (i64 4294967297 to <4 x float>*), align 16
+  ret <4 x float> %0
+}
+
+define void @store_v4f32_cst(<4 x float> %str) {
+; CHECK-LABEL: store_v4f32_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pstxv v2, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  store <4 x float> %str, <4 x float>* inttoptr (i64 4294967297 to <4 x float>*), align 16
+  ret void
+}
+
+define <2 x double> @load_v2f64_cst() {
+; CHECK-LABEL: load_v2f64_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plxv v2, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = load <2 x double>, <2 x double>* inttoptr (i64 4294967297 to <2 x double>*), align 16
+  ret <2 x double> %0
+}
+
+define void @store_v2f64_cst(<2 x double> %str) {
+; CHECK-LABEL: store_v2f64_cst:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pstxv v2, 4294967297(0), 0
+; CHECK-NEXT:    blr
+entry:
+  store <2 x double> %str, <2 x double>* inttoptr (i64 4294967297 to <2 x double>*), align 16
+  ret void
+}

llvm/test/CodeGen/PowerPC/prefixed-ld-st.ll

+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -verify-machineinstrs -mtriple=powerpc64le-unknown-linux-gnu -O3 \
+; RUN:     -mcpu=pwr10 -ppc-asm-full-reg-names -ppc-vsr-nums-as-vr \
+; RUN:     < %s | FileCheck %s
+; RUN: llc -verify-machineinstrs -mtriple=powerpc64-unknown-linux-gnu -O3 \
+; RUN:     -mcpu=pwr10 -ppc-asm-full-reg-names -ppc-vsr-nums-as-vr \
+; RUN:     < %s | FileCheck %s
+
+; i32 tests: loading, storing a non-constant address
+define void @extload_store_i8_i32_add(i8* nocapture readonly %Ld, i8* nocapture %St) {
+; CHECK-LABEL: extload_store_i8_i32_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plbz r3, 4294967297(r3), 0
+; CHECK-NEXT:    pstb r3, 4294967297(r4), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %Ld, i64 4294967297
+  %0 = load i8, i8* %add.ptr, align 1
+  %add.ptr1 = getelementptr inbounds i8, i8* %St, i64 4294967297
+  store i8 %0, i8* %add.ptr1, align 1
+  ret void
+}
+
+define void @zextload_store_i8_i32_add(i8* nocapture readonly %Ld, i32* nocapture %St) {
+; CHECK-LABEL: zextload_store_i8_i32_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plbz r3, 4294967297(r3), 0
+; CHECK-NEXT:    pstw r3, 4294967297(r4), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %Ld, i64 4294967297
+  %0 = load i8, i8* %add.ptr, align 1
+  %conv = zext i8 %0 to i32
+  %1 = bitcast i32* %St to i8*
+  %add.ptr1 = getelementptr inbounds i8, i8* %1, i64 4294967297
+  %2 = bitcast i8* %add.ptr1 to i32*
+  store i32 %conv, i32* %2, align 4
+  ret void
+}
+
+define void @extload_store_i16_i32_add(i16* nocapture readonly %Ld, i16* nocapture %St) {
+; CHECK-LABEL: extload_store_i16_i32_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plhz r3, 4294967297(r3), 0
+; CHECK-NEXT:    psth r3, 4294967297(r4), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = bitcast i16* %Ld to i8*
+  %add.ptr = getelementptr inbounds i8, i8* %0, i64 4294967297
+  %1 = bitcast i8* %add.ptr to i16*
+  %2 = load i16, i16* %1, align 2
+  %3 = bitcast i16* %St to i8*
+  %add.ptr1 = getelementptr inbounds i8, i8* %3, i64 4294967297
+  %4 = bitcast i8* %add.ptr1 to i16*
+  store i16 %2, i16* %4, align 2
+  ret void
+}
+
+define void @zextload_store_i16_i32_add(i16* nocapture readonly %Ld, i32* nocapture %St) {
+; CHECK-LABEL: zextload_store_i16_i32_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plhz r3, 4294967297(r3), 0
+; CHECK-NEXT:    pstw r3, 4294967297(r4), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = bitcast i16* %Ld to i8*
+  %add.ptr = getelementptr inbounds i8, i8* %0, i64 4294967297
+  %1 = bitcast i8* %add.ptr to i16*
+  %2 = load i16, i16* %1, align 2
+  %conv = zext i16 %2 to i32
+  %3 = bitcast i32* %St to i8*
+  %add.ptr1 = getelementptr inbounds i8, i8* %3, i64 4294967297
+  %4 = bitcast i8* %add.ptr1 to i32*
+  store i32 %conv, i32* %4, align 4
+  ret void
+}
+
+define void @sextload_store_i16_i32_add(i16* nocapture readonly %Ld, i32* nocapture %St) {
+; CHECK-LABEL: sextload_store_i16_i32_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plha r3, 4294967297(r3), 0
+; CHECK-NEXT:    pstw r3, 4294967297(r4), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = bitcast i16* %Ld to i8*
+  %add.ptr = getelementptr inbounds i8, i8* %0, i64 4294967297
+  %1 = bitcast i8* %add.ptr to i16*
+  %2 = load i16, i16* %1, align 2
+  %conv = sext i16 %2 to i32
+  %3 = bitcast i32* %St to i8*
+  %add.ptr1 = getelementptr inbounds i8, i8* %3, i64 4294967297
+  %4 = bitcast i8* %add.ptr1 to i32*
+  store i32 %conv, i32* %4, align 4
+  ret void
+}
+
+define void @load_store_i32_add(i32* nocapture readonly %Ld, i32* nocapture %St) {
+; CHECK-LABEL: load_store_i32_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plwz r3, 4294967297(r3), 0
+; CHECK-NEXT:    pstw r3, 4294967297(r4), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = bitcast i32* %Ld to i8*
+  %add.ptr = getelementptr inbounds i8, i8* %0, i64 4294967297
+  %1 = bitcast i8* %add.ptr to i32*
+  %2 = load i32, i32* %1, align 4
+  %3 = bitcast i32* %St to i8*
+  %add.ptr1 = getelementptr inbounds i8, i8* %3, i64 4294967297
+  %4 = bitcast i8* %add.ptr1 to i32*
+  store i32 %2, i32* %4, align 4
+  ret void
+}
+
+; i64 tests: loading, storing a non-constant address
+define signext i8 @extload_i8_i64_add(i8* nocapture readonly %ptr) {
+; CHECK-LABEL: extload_i8_i64_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plbz r3, 4294967297(r3), 0
+; CHECK-NEXT:    extsb r3, r3
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = load i8, i8* %add.ptr, align 1
+  ret i8 %0
+}
+
+define zeroext i8 @zextload_i8_i64_add(i8* nocapture readonly %ptr) {
+; CHECK-LABEL: zextload_i8_i64_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plbz r3, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = load i8, i8* %add.ptr, align 1
+  ret i8 %0
+}
+
+define i16 @extload_i16_i64_add(i8* nocapture readonly %ptr) {
+; CHECK-LABEL: extload_i16_i64_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plhz r3, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to i16*
+  %1 = load i16, i16* %0, align 2
+  ret i16 %1
+}
+
+define zeroext i16 @zextload_i16_i64_add(i8* nocapture readonly %ptr) {
+; CHECK-LABEL: zextload_i16_i64_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plhz r3, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to i16*
+  %1 = load i16, i16* %0, align 2
+  ret i16 %1
+}
+
+define signext i16 @sextload_i16_i64_add(i8* nocapture readonly %ptr) {
+; CHECK-LABEL: sextload_i16_i64_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plha r3, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to i16*
+  %1 = load i16, i16* %0, align 2
+  ret i16 %1
+}
+
+define i32 @extload_i32_i64_add(i8* nocapture readonly %ptr) {
+; CHECK-LABEL: extload_i32_i64_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plwz r3, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to i32*
+  %1 = load i32, i32* %0, align 4
+  ret i32 %1
+}
+
+define zeroext i32 @zextload_i32_i64_add(i8* nocapture readonly %ptr) {
+; CHECK-LABEL: zextload_i32_i64_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plwz r3, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to i32*
+  %1 = load i32, i32* %0, align 4
+  ret i32 %1
+}
+
+define signext i32 @sextload_i32_i64_add(i8* nocapture readonly %ptr) {
+; CHECK-LABEL: sextload_i32_i64_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plwa r3, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to i32*
+  %1 = load i32, i32* %0, align 4
+  ret i32 %1
+}
+
+define i64 @load_i64_add(i8* nocapture readonly %ptr) {
+; CHECK-LABEL: load_i64_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pld r3, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to i64*
+  %1 = load i64, i64* %0, align 8
+  ret i64 %1
+}
+
+define void @store_i8_i64_add(i8* nocapture %ptr, i8 zeroext %str) {
+; CHECK-LABEL: store_i8_i64_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pstb r4, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  store i8 %str, i8* %add.ptr, align 1
+  ret void
+}
+
+define void @store_i16_i64_add(i8* nocapture %ptr, i16 zeroext %str) {
+; CHECK-LABEL: store_i16_i64_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    psth r4, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to i16*
+  store i16 %str, i16* %0, align 2
+  ret void
+}
+
+define void @store_i32_i64_add(i8* nocapture %ptr, i32 zeroext %str) {
+; CHECK-LABEL: store_i32_i64_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pstw r4, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to i32*
+  store i32 %str, i32* %0, align 4
+  ret void
+}
+
+define void @store_i64_add(i8* nocapture %ptr, i64 %str) {
+; CHECK-LABEL: store_i64_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pstd r4, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to i64*
+  store i64 %str, i64* %0, align 8
+  ret void
+}
+
+; float, double, f128: loading, storing a non-constant address
+define float @load_float_add(i8* nocapture readonly %ptr) {
+; CHECK-LABEL: load_float_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plfs f1, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to float*
+  %1 = load float, float* %0, align 4
+  ret float %1
+}
+
+define double @extload_float_add(i8* nocapture readonly %ptr) {
+; CHECK-LABEL: extload_float_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pli r4, 4294967297
+; CHECK-NEXT:    add r3, r3, r4
+; CHECK-NEXT:    plfs f1, r3(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to float*
+  %1 = load float, float* %0, align 4
+  %conv = fpext float %1 to double
+  ret double %conv
+}
+
+define double @load_double_add(i8* nocapture readonly %ptr) {
+; CHECK-LABEL: load_double_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plfd f1, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to double*
+  %1 = load double, double* %0, align 8
+  ret double %1
+}
+
+define void @store_float_add(i8* nocapture %ptr, float %str) {
+; CHECK-LABEL: store_float_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pstfs f1, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to float*
+  store float %str, float* %0, align 4
+  ret void
+}
+
+define void @store_double_add(i8* nocapture %ptr, double %str) {
+; CHECK-LABEL: store_double_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pstfd f1, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to double*
+  store double %str, double* %0, align 8
+  ret void
+}
+
+define fp128 @load_f128_add(i8* nocapture readonly %ptr) {
+; CHECK-LABEL: load_f128_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plxv v2, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to fp128*
+  %1 = load fp128, fp128* %0, align 16
+  ret fp128 %1
+}
+
+define void @store_f128_add(i8* nocapture %ptr, fp128 %str) {
+; CHECK-LABEL: store_f128_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pstxv v2, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to fp128*
+  store fp128 %str, fp128* %0, align 16
+  ret void
+}
+
+define void @store_double_fp_to_uint_add(i8* nocapture %ptr, double %str) {
+; CHECK-LABEL: store_double_fp_to_uint_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    xscvdpuxds v2, f1
+; CHECK-NEXT:    pli r4, 4294967297
+; CHECK-NEXT:    add r3, r3, r4
+; CHECK-NEXT:    pstxsd v2, r3(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %conv = fptoui double %str to i64
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to i64*
+  store i64 %conv, i64* %0, align 8
+  ret void
+}
+
+define void @store_double_fp_to_int_add(i8* nocapture %ptr, double %str) {
+; CHECK-LABEL: store_double_fp_to_int_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    xscvdpsxds v2, f1
+; CHECK-NEXT:    pli r4, 4294967297
+; CHECK-NEXT:    add r3, r3, r4
+; CHECK-NEXT:    pstxsd v2, r3(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %conv = fptosi double %str to i64
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to i64*
+  store i64 %conv, i64* %0, align 8
+  ret void
+}
+
+define void @store_f128_fp_to_uint_add(i8* nocapture %ptr, fp128 %str) {
+; CHECK-LABEL: store_f128_fp_to_uint_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    xscvqpudz v2, v2
+; CHECK-NEXT:    pli r4, 4294967297
+; CHECK-NEXT:    add r3, r3, r4
+; CHECK-NEXT:    pstxsd v2, r3(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %conv = fptoui fp128 %str to i64
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to i64*
+  store i64 %conv, i64* %0, align 8
+  ret void
+}
+
+define void @store_f128_fp_to_int_add(i8* nocapture %ptr, fp128 %str) {
+; CHECK-LABEL: store_f128_fp_to_int_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    xscvqpsdz v2, v2
+; CHECK-NEXT:    pli r4, 4294967297
+; CHECK-NEXT:    add r3, r3, r4
+; CHECK-NEXT:    pstxsd v2, r3(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %conv = fptosi fp128 %str to i64
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to i64*
+  store i64 %conv, i64* %0, align 8
+  ret void
+}
+
+; v4i32, v2i64, v4f32, v2f64: loading, storing a non-constant address
+define <4 x i32> @load_v4i32_add(i8* nocapture readonly %ptr) {
+; CHECK-LABEL: load_v4i32_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plxv v2, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to <4 x i32>*
+  %1 = load <4 x i32>, <4 x i32>* %0, align 16
+  ret <4 x i32> %1
+}
+
+define void @store_v4i32_add(i8* nocapture %ptr, <4 x i32> %str) {
+; CHECK-LABEL: store_v4i32_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pstxv v2, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to <4 x i32>*
+  store <4 x i32> %str, <4 x i32>* %0, align 16
+  ret void
+}
+
+define <2 x i64> @load_v2i64_add(i8* nocapture readonly %ptr) {
+; CHECK-LABEL: load_v2i64_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plxv v2, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to <2 x i64>*
+  %1 = load <2 x i64>, <2 x i64>* %0, align 16
+  ret <2 x i64> %1
+}
+
+define void @store_v2i64_add(i8* nocapture %ptr, <2 x i64> %str) {
+; CHECK-LABEL: store_v2i64_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pstxv v2, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to <2 x i64>*
+  store <2 x i64> %str, <2 x i64>* %0, align 16
+  ret void
+}
+
+define <4 x float> @load_v4f32_add(i8* nocapture readonly %ptr) {
+; CHECK-LABEL: load_v4f32_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plxv v2, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to <4 x float>*
+  %1 = load <4 x float>, <4 x float>* %0, align 16
+  ret <4 x float> %1
+}
+
+define void @store_v4f32_add(i8* nocapture %ptr, <4 x float> %str) {
+; CHECK-LABEL: store_v4f32_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pstxv v2, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to <4 x float>*
+  store <4 x float> %str, <4 x float>* %0, align 16
+  ret void
+}
+
+define <2 x double> @load_v2f64_add(i8* nocapture readonly %ptr) {
+; CHECK-LABEL: load_v2f64_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plxv v2, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to <2 x double>*
+  %1 = load <2 x double>, <2 x double>* %0, align 16
+  ret <2 x double> %1
+}
+
+define void @store_v2f64_add(i8* nocapture %ptr, <2 x double> %str) {
+; CHECK-LABEL: store_v2f64_add:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pstxv v2, 4294967297(r3), 0
+; CHECK-NEXT:    blr
+entry:
+  %add.ptr = getelementptr inbounds i8, i8* %ptr, i64 4294967297
+  %0 = bitcast i8* %add.ptr to <2 x double>*
+  store <2 x double> %str, <2 x double>* %0, align 16
+  ret void
+}
+
+; Testing prefixed load/store intrinsics
+define void @ld_st_intrinsics(<256 x i1>* %vpp, <256 x i1>* %vp2) {
+; CHECK-LABEL: ld_st_intrinsics:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    plxvp vsp0, 32799(r3), 0
+; CHECK-NEXT:    pstxvp vsp0, 32799(r4), 0
+; CHECK-NEXT:    blr
+entry:
+  %0 = bitcast <256 x i1>* %vpp to i8*
+  %1 = getelementptr i8, i8* %0, i64 32799
+  %2 = tail call <256 x i1> @llvm.ppc.vsx.lxvp(i8* %1)
+  %3 = bitcast <256 x i1>* %vp2 to i8*
+  %4 = getelementptr i8, i8* %3, i64 32799
+  tail call void @llvm.ppc.vsx.stxvp(<256 x i1> %2, i8* %4)
+  ret void
+}
+
+declare <256 x i1> @llvm.ppc.vsx.lxvp(i8*) #6
+declare void @llvm.ppc.vsx.stxvp(<256 x i1>, i8*) #7
+