[MachineMemOperand] Move synchronization scope and atomic orderings from SDNode to MachineMemOperand

[kzhuravl]

Summary

+ remove redundant getAtomic* member functions from SelectionDAG.

In order to implement memory model in AMDGPU backend, we need to generate a specific sequence of instructions depending on atomic ordering and synchronization scope. These instructions have to stick together, for example:

...
%val = load atomic i32, i32 addrspace(4)* %in acquire, align 4
...

Results in:

...
s_waitcnt
flat_load_dword ...
s_waitcnt
buffer_wbinvl1_vol
...

One approach in implementing this is to use pseudo instructions, and expand them into real instructions in the post-RA expansion pass. The problem we have run into with this approach in AMDGPU backend is we have to define quite a lot of pseudo instructions due to having multiple different instruction opcodes for loads and stores.

Another approach we have explored is to move AtomicOrdering and SynchScope from MemSDNode and AtomicSDNode into MachineMemOperand. This way we do not have to define multiple pseudo instructions, and just use MachineMemOperand. There is also a fixme comment that suggests the same approach.

[jlebar]

include/llvm/CodeGen/MachineMemOperand.h

128 ↗

(On Diff #71411)

I am concerned that this will *substantially* increase the size of MMO.

Do you actually need all this space?

[Gerolf]

My concern is this would increase memory consumption in all backends. Maybe you can hide most of it with an opaque pointer in the machine operand.

[kzhuravl]

Hi, thanks for taking a look. I agree that the previous diff caused increased machine memory operand size. Currently machine memory operand's member layout has a 4 byte hole between BaseAlignLog2 and AAInfo. If we pack scope and orderings as it is done in the updated diff and place it between BaseAlignLog2 and AAInfo the size of the machine memory operand does not change. In addition, I think, having scope and ordering information available in machine memory operand will be useful for the scheduler.

Would that be acceptable?

Thanks,
Konstantin

[kzhuravl]

include/llvm/CodeGen/MachineMemOperand.h

123 ↗

(On Diff #72009)

If this patch (or some variation of it) is acceptable, the size of SynchScope will increase to 8 bits. Furthermore, we can generalize MachineAtomicInfo to AdditionalData with extra 16 bits available.

[kzhuravl]

Ping

[jlebar]

In D24577#548365, @kzhuravl wrote:

Currently machine memory operand's member layout has a 4 byte hole between BaseAlignLog2 and AAInfo.

Only on 64-bit platforms, right? Are we willing to bite a 4-byte increase to MMO size on 32-bit?

include/llvm/CodeGen/MachineMemOperand.h

131 ↗

(On Diff #72009)

I don't think we need this field.

151 ↗

(On Diff #72009)

Can we do this inside the constructor?

include/llvm/CodeGen/SelectionDAGNodes.h

1198 ↗

(On Diff #72009)

Should we make the MMO and AtomicSDNode interfaces match? Right now we have getOrdering and getSuccessOrdering on MMO, but only getOrdering on the SDNode.

I think I'd be OK having two functions that both return the success ordering if we assert inside getFailureOrdering / getSuccessOrdering that we have a cmpxchg instruction. Otherwise maybe having only the one function makes sense.

[• tstellarAMD]

In D24577#557734, @jlebar wrote:

In D24577#548365, @kzhuravl wrote:

Currently machine memory operand's member layout has a 4 byte hole between BaseAlignLog2 and AAInfo.

Only on 64-bit platforms, right? Are we willing to bite a 4-byte increase to MMO size on 32-bit?

This would be 4-bytes per MachineInstr with an MMO, that doesn't see too bad to me.

[kzhuravl]

In D24577#570534, @tstellarAMD wrote:

In D24577#557734, @jlebar wrote:

In D24577#548365, @kzhuravl wrote:

Currently machine memory operand's member layout has a 4 byte hole between BaseAlignLog2 and AAInfo.

Only on 64-bit platforms, right? Are we willing to bite a 4-byte increase to MMO size on 32-bit?

This would be 4-bytes per MachineInstr with an MMO, that doesn't see too bad to me.

Alternatively, we can introduce a new class, which will describe atomic information and will be derived from MachineMemOperand (MachineAtomicOperand?). Make atomic accessor functions in MachineMemOperand virtual, and override them in the derived class. This way only 4 byte increase for atomic operations. Any thoughts on this?

[kzhuravl]

Address inline comments.

include/llvm/CodeGen/MachineMemOperand.h

131 ↗

(On Diff #72009)

Removed.

151 ↗

(On Diff #72009)

Moved inside the constructor.

include/llvm/CodeGen/SelectionDAGNodes.h

1198 ↗

(On Diff #72009)

Added asserts inside getFailureOrdering/getSuccessOrdering.

[jlebar]

In D24577#570544, @kzhuravl wrote:

Alternatively, we can introduce a new class, which will describe atomic information and will be derived from MachineMemOperand (MachineAtomicOperand?). Make atomic accessor functions in MachineMemOperand virtual, and override them in the derived class. This way only 4 byte increase for atomic operations. Any thoughts on this?

This would necessarily add a vptr to every MMO object, increasing its size by one word. So that would be just as bad from a memory perspective (and substantially worse from a CPU perspective).

I think I'm OK with this as-is. I agree it makes sense for these fields to live on MMO.

llvm/trunk/include/llvm/CodeGen/MachineFunction.h

public:
 
   /// DeleteMachineBasicBlock - Delete the given MachineBasicBlock.
   ///
   void DeleteMachineBasicBlock(MachineBasicBlock *MBB);
 
   /// getMachineMemOperand - Allocate a new MachineMemOperand.
   /// MachineMemOperands are owned by the MachineFunction and need not be
   /// explicitly deallocated.
-  MachineMemOperand *getMachineMemOperand(MachinePointerInfo PtrInfo,
-                                          MachineMemOperand::Flags f,
-                                          uint64_t s, unsigned base_alignment,
-                                          const AAMDNodes &AAInfo = AAMDNodes(),
-                                          const MDNode *Ranges = nullptr);
+  MachineMemOperand *getMachineMemOperand(
+      MachinePointerInfo PtrInfo, MachineMemOperand::Flags f, uint64_t s,
+      unsigned base_alignment, const AAMDNodes &AAInfo = AAMDNodes(),
+      const MDNode *Ranges = nullptr,
+      SynchronizationScope SynchScope = CrossThread,
+      AtomicOrdering Ordering = AtomicOrdering::NotAtomic,
+      AtomicOrdering FailureOrdering = AtomicOrdering::NotAtomic);
 
   /// getMachineMemOperand - Allocate a new MachineMemOperand by copying
   /// an existing one, adjusting by an offset and using the given size.
   /// MachineMemOperands are owned by the MachineFunction and need not be
   /// explicitly deallocated.
   MachineMemOperand *getMachineMemOperand(const MachineMemOperand *MMO,
                                           int64_t Offset, uint64_t Size);
 

llvm/trunk/include/llvm/CodeGen/MachineMemOperand.h

 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_CODEGEN_MACHINEMEMOPERAND_H
 #define LLVM_CODEGEN_MACHINEMEMOPERAND_H
 
 #include "llvm/ADT/BitmaskEnum.h"
 #include "llvm/ADT/PointerUnion.h"
 #include "llvm/CodeGen/PseudoSourceValue.h"
+#include "llvm/IR/Instructions.h"
 #include "llvm/IR/Metadata.h"
 #include "llvm/IR/Value.h"  // PointerLikeTypeTraits<Value*>
+#include "llvm/Support/AtomicOrdering.h"
 #include "llvm/Support/DataTypes.h"
 
 namespace llvm {
 
 class FoldingSetNodeID;
 class MDNode;
 class raw_ostream;
 class MachineFunction;
enum Flags : uint16_t {
     MOTargetFlag1 = 1u << 6,
     MOTargetFlag2 = 1u << 7,
     MOTargetFlag3 = 1u << 8,
 
     LLVM_MARK_AS_BITMASK_ENUM(/* LargestFlag = */ MOTargetFlag3)
   };
 
 private:
+  /// Atomic information for this memory operation.
+  struct MachineAtomicInfo {
+    /// Synchronization scope for this memory operation.
+    unsigned SynchScope : 1;      // enum SynchronizationScope
+    /// Atomic ordering requirements for this memory operation. For cmpxchg
+    /// atomic operations, atomic ordering requirements when store occurs.
+    unsigned Ordering : 4;        // enum AtomicOrdering
+    /// For cmpxchg atomic operations, atomic ordering requirements when store
+    /// does not occur.
+    unsigned FailureOrdering : 4; // enum AtomicOrdering
+  };
+
   MachinePointerInfo PtrInfo;
   uint64_t Size;
   Flags FlagVals;
   uint16_t BaseAlignLog2; // log_2(base_alignment) + 1
+  MachineAtomicInfo AtomicInfo;
   AAMDNodes AAInfo;
   const MDNode *Ranges;
 
 public:
   /// Construct a MachineMemOperand object with the specified PtrInfo, flags,
-  /// size, and base alignment.
+  /// size, and base alignment. For atomic operations the synchronization scope
+  /// and atomic ordering requirements must also be specified. For cmpxchg
+  /// atomic operations the atomic ordering requirements when store does not
+  /// occur must also be specified.
   MachineMemOperand(MachinePointerInfo PtrInfo, Flags flags, uint64_t s,
                     unsigned base_alignment,
                     const AAMDNodes &AAInfo = AAMDNodes(),
-                    const MDNode *Ranges = nullptr);
+                    const MDNode *Ranges = nullptr,
+                    SynchronizationScope SynchScope = CrossThread,
+                    AtomicOrdering Ordering = AtomicOrdering::NotAtomic,
+                    AtomicOrdering FailureOrdering = AtomicOrdering::NotAtomic);
 
   const MachinePointerInfo &getPointerInfo() const { return PtrInfo; }
 
   /// Return the base address of the memory access. This may either be a normal
   /// LLVM IR Value, or one of the special values used in CodeGen.
   /// Special values are those obtained via
   /// PseudoSourceValue::getFixedStack(int), PseudoSourceValue::getStack, and
   /// other PseudoSourceValue member functions which return objects which stand
public:
   uint64_t getBaseAlignment() const { return (1u << BaseAlignLog2) >> 1; }
 
   /// Return the AA tags for the memory reference.
   AAMDNodes getAAInfo() const { return AAInfo; }
 
   /// Return the range tag for the memory reference.
   const MDNode *getRanges() const { return Ranges; }
 
+  /// Return the synchronization scope for this memory operation.
+  SynchronizationScope getSynchScope() const {
+    return static_cast<SynchronizationScope>(AtomicInfo.SynchScope);
+  }
+
+  /// Return the atomic ordering requirements for this memory operation.
+  AtomicOrdering getOrdering() const {
+    return static_cast<AtomicOrdering>(AtomicInfo.Ordering);
+  }
+
+  /// For cmpxchg atomic operations, return the atomic ordering requirements
+  /// when store occurs.
+  AtomicOrdering getSuccessOrdering() const {
+    return getOrdering();
+  }
+
+  /// For cmpxchg atomic operations, return the atomic ordering requirements
+  /// when store does not occur.
+  AtomicOrdering getFailureOrdering() const {
+    return static_cast<AtomicOrdering>(AtomicInfo.FailureOrdering);
+  }
+
   bool isLoad() const { return FlagVals & MOLoad; }
   bool isStore() const { return FlagVals & MOStore; }
   bool isVolatile() const { return FlagVals & MOVolatile; }
   bool isNonTemporal() const { return FlagVals & MONonTemporal; }
   bool isDereferenceable() const { return FlagVals & MODereferenceable; }
   bool isInvariant() const { return FlagVals & MOInvariant; }
 
+  /// Returns true if this operation has an atomic ordering requirement of
+  /// unordered or higher, false otherwise.
+  bool isAtomic() const { return getOrdering() != AtomicOrdering::NotAtomic; }
+
   /// Returns true if this memory operation doesn't have any ordering
   /// constraints other than normal aliasing. Volatile and atomic memory
   /// operations can't be reordered.
   ///
   /// Currently, we don't model the difference between volatile and atomic
   /// operations. They should retain their ordering relative to all memory
   /// operations.
   bool isUnordered() const { return !isVolatile(); }

llvm/trunk/include/llvm/CodeGen/SelectionDAG.h

#endif
   SDValue getAtomicCmpSwap(unsigned Opcode, const SDLoc &dl, EVT MemVT,
                            SDVTList VTs, SDValue Chain, SDValue Ptr,
                            SDValue Cmp, SDValue Swp, MachinePointerInfo PtrInfo,
                            unsigned Alignment, AtomicOrdering SuccessOrdering,
                            AtomicOrdering FailureOrdering,
                            SynchronizationScope SynchScope);
   SDValue getAtomicCmpSwap(unsigned Opcode, const SDLoc &dl, EVT MemVT,
                            SDVTList VTs, SDValue Chain, SDValue Ptr,
-                           SDValue Cmp, SDValue Swp, MachineMemOperand *MMO,
-                           AtomicOrdering SuccessOrdering,
-                           AtomicOrdering FailureOrdering,
-                           SynchronizationScope SynchScope);
+                           SDValue Cmp, SDValue Swp, MachineMemOperand *MMO);
 
   /// Gets a node for an atomic op, produces result (if relevant)
   /// and chain and takes 2 operands.
   SDValue getAtomic(unsigned Opcode, const SDLoc &dl, EVT MemVT, SDValue Chain,
                     SDValue Ptr, SDValue Val, const Value *PtrVal,
                     unsigned Alignment, AtomicOrdering Ordering,
                     SynchronizationScope SynchScope);
   SDValue getAtomic(unsigned Opcode, const SDLoc &dl, EVT MemVT, SDValue Chain,
-                    SDValue Ptr, SDValue Val, MachineMemOperand *MMO,
-                    AtomicOrdering Ordering, SynchronizationScope SynchScope);
+                    SDValue Ptr, SDValue Val, MachineMemOperand *MMO);
 
   /// Gets a node for an atomic op, produces result and chain and
   /// takes 1 operand.
   SDValue getAtomic(unsigned Opcode, const SDLoc &dl, EVT MemVT, EVT VT,
-                    SDValue Chain, SDValue Ptr, MachineMemOperand *MMO,
-                    AtomicOrdering Ordering, SynchronizationScope SynchScope);
+                    SDValue Chain, SDValue Ptr, MachineMemOperand *MMO);
 
   /// Gets a node for an atomic op, produces result and chain and takes N
   /// operands.
   SDValue getAtomic(unsigned Opcode, const SDLoc &dl, EVT MemVT,
                     SDVTList VTList, ArrayRef<SDValue> Ops,
-                    MachineMemOperand *MMO, AtomicOrdering SuccessOrdering,
-                    AtomicOrdering FailureOrdering,
-                    SynchronizationScope SynchScope);
-  SDValue getAtomic(unsigned Opcode, const SDLoc &dl, EVT MemVT,
-                    SDVTList VTList, ArrayRef<SDValue> Ops,
-                    MachineMemOperand *MMO, AtomicOrdering Ordering,
-                    SynchronizationScope SynchScope);
+                    MachineMemOperand *MMO);
 
   /// Creates a MemIntrinsicNode that may produce a
   /// result and takes a list of operands. Opcode may be INTRINSIC_VOID,
   /// INTRINSIC_W_CHAIN, or a target-specific opcode with a value not
   /// less than FIRST_TARGET_MEMORY_OPCODE.
   SDValue getMemIntrinsicNode(unsigned Opcode, const SDLoc &dl, SDVTList VTList,
                               ArrayRef<SDValue> Ops, EVT MemVT,
                               MachinePointerInfo PtrInfo, unsigned Align = 0,

llvm/trunk/include/llvm/CodeGen/SelectionDAGNodes.h

class MemSDNodeBitfields {
     friend class AtomicSDNode;
 
     uint16_t : NumSDNodeBits;
 
     uint16_t IsVolatile : 1;
     uint16_t IsNonTemporal : 1;
     uint16_t IsDereferenceable : 1;
     uint16_t IsInvariant : 1;
-    uint16_t SynchScope : 1; // enum SynchronizationScope
-    uint16_t Ordering : 4;   // enum AtomicOrdering
   };
-  enum { NumMemSDNodeBits = NumSDNodeBits + 9 };
+  enum { NumMemSDNodeBits = NumSDNodeBits + 4 };
 
   class LSBaseSDNodeBitfields {
     friend class LSBaseSDNode;
     uint16_t : NumMemSDNodeBits;
 
     uint16_t AddressingMode : 3; // enum ISD::MemIndexedMode
   };
   enum { NumLSBaseSDNodeBits = NumMemSDNodeBits + 3 };
unsigned getRawSubclassData() const {
     return Data;
   }
 
   bool isVolatile() const { return MemSDNodeBits.IsVolatile; }
   bool isNonTemporal() const { return MemSDNodeBits.IsNonTemporal; }
   bool isDereferenceable() const { return MemSDNodeBits.IsDereferenceable; }
   bool isInvariant() const { return MemSDNodeBits.IsInvariant; }
 
-  AtomicOrdering getOrdering() const {
-    return static_cast<AtomicOrdering>(MemSDNodeBits.Ordering);
-  }
-  SynchronizationScope getSynchScope() const {
-    return static_cast<SynchronizationScope>(MemSDNodeBits.SynchScope);
-  }
-
   // Returns the offset from the location of the access.
   int64_t getSrcValueOffset() const { return MMO->getOffset(); }
 
   /// Returns the AA info that describes the dereference.
   AAMDNodes getAAInfo() const { return MMO->getAAInfo(); }
 
   /// Returns the Ranges that describes the dereference.
   const MDNode *getRanges() const { return MMO->getRanges(); }
 
+  /// Return the synchronization scope for this memory operation.
+  SynchronizationScope getSynchScope() const { return MMO->getSynchScope(); }
+
+  /// Return the atomic ordering requirements for this memory operation.
+  AtomicOrdering getOrdering() const { return MMO->getOrdering(); }
+
   /// Return the type of the in-memory value.
   EVT getMemoryVT() const { return MemoryVT; }
 
   /// Return a MachineMemOperand object describing the memory
   /// reference performed by operation.
   MachineMemOperand *getMemOperand() const { return MMO; }
 
   const MachinePointerInfo &getPointerInfo() const {
return N->getOpcode() == ISD::LOAD                ||
            N->getOpcode() == ISD::MSCATTER            ||
            N->isMemIntrinsic()                        ||
            N->isTargetMemoryOpcode();
   }
 };
 
 /// This is an SDNode representing atomic operations.
 class AtomicSDNode : public MemSDNode {
-  /// For cmpxchg instructions, the ordering requirements when a store does not
-  /// occur.
-  AtomicOrdering FailureOrdering;
-
-  void InitAtomic(AtomicOrdering SuccessOrdering,
-                  AtomicOrdering FailureOrdering,
-                  SynchronizationScope SynchScope) {
-    MemSDNodeBits.Ordering = static_cast<uint16_t>(SuccessOrdering);
-    assert(getOrdering() == SuccessOrdering && "Value truncated");
-    MemSDNodeBits.SynchScope = static_cast<uint16_t>(SynchScope);
-    assert(getSynchScope() == SynchScope && "Value truncated");
-    this->FailureOrdering = FailureOrdering;
-  }
-
 public:
   AtomicSDNode(unsigned Opc, unsigned Order, const DebugLoc &dl, SDVTList VTL,
-               EVT MemVT, MachineMemOperand *MMO,
-               AtomicOrdering SuccessOrdering, AtomicOrdering FailureOrdering,
-               SynchronizationScope SynchScope)
-      : MemSDNode(Opc, Order, dl, VTL, MemVT, MMO) {
-    InitAtomic(SuccessOrdering, FailureOrdering, SynchScope);
-  }
+               EVT MemVT, MachineMemOperand *MMO)
+      : MemSDNode(Opc, Order, dl, VTL, MemVT, MMO) {}
 
   const SDValue &getBasePtr() const { return getOperand(1); }
   const SDValue &getVal() const { return getOperand(2); }
 
-  AtomicOrdering getSuccessOrdering() const {
-    return getOrdering();
+  /// Returns true if this SDNode represents cmpxchg atomic operation, false
+  /// otherwise.
+  bool isCompareAndSwap() const {
+    unsigned Op = getOpcode();
+    return Op == ISD::ATOMIC_CMP_SWAP ||
+           Op == ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS;
   }
 
-  // Not quite enough room in SubclassData for everything, so failure gets its
-  // own field.
-  AtomicOrdering getFailureOrdering() const {
-    return FailureOrdering;
+  /// For cmpxchg atomic operations, return the atomic ordering requirements
+  /// when store occurs.
+  AtomicOrdering getSuccessOrdering() const {
+    assert(isCompareAndSwap() && "Must be cmpxchg operation");
+    return MMO->getSuccessOrdering();
   }
 
-  bool isCompareAndSwap() const {
-    unsigned Op = getOpcode();
-    return Op == ISD::ATOMIC_CMP_SWAP || Op == ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS;
+  /// For cmpxchg atomic operations, return the atomic ordering requirements
+  /// when store does not occur.
+  AtomicOrdering getFailureOrdering() const {
+    assert(isCompareAndSwap() && "Must be cmpxchg operation");
+    return MMO->getFailureOrdering();
   }
 
   // Methods to support isa and dyn_cast
   static bool classof(const SDNode *N) {
     return N->getOpcode() == ISD::ATOMIC_CMP_SWAP     ||
            N->getOpcode() == ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS ||
            N->getOpcode() == ISD::ATOMIC_SWAP         ||
            N->getOpcode() == ISD::ATOMIC_LOAD_ADD     ||

llvm/trunk/lib/CodeGen/MachineFunction.cpp

 MachineFunction::DeleteMachineBasicBlock(MachineBasicBlock *MBB) {
   assert(MBB->getParent() == this && "MBB parent mismatch!");
   MBB->~MachineBasicBlock();
   BasicBlockRecycler.Deallocate(Allocator, MBB);
 }
 
 MachineMemOperand *MachineFunction::getMachineMemOperand(
     MachinePointerInfo PtrInfo, MachineMemOperand::Flags f, uint64_t s,
-    unsigned base_alignment, const AAMDNodes &AAInfo, const MDNode *Ranges) {
+    unsigned base_alignment, const AAMDNodes &AAInfo, const MDNode *Ranges,
+    SynchronizationScope SynchScope, AtomicOrdering Ordering,
+    AtomicOrdering FailureOrdering) {
   return new (Allocator)
-      MachineMemOperand(PtrInfo, f, s, base_alignment, AAInfo, Ranges);
+      MachineMemOperand(PtrInfo, f, s, base_alignment, AAInfo, Ranges,
+                        SynchScope, Ordering, FailureOrdering);
 }
 
 MachineMemOperand *
 MachineFunction::getMachineMemOperand(const MachineMemOperand *MMO,
                                       int64_t Offset, uint64_t Size) {
   if (MMO->getValue())
     return new (Allocator)
                MachineMemOperand(MachinePointerInfo(MMO->getValue(),
                                                     MMO->getOffset()+Offset),
-                                 MMO->getFlags(), Size,
-                                 MMO->getBaseAlignment());
+                                 MMO->getFlags(), Size, MMO->getBaseAlignment(),
+                                 AAMDNodes(), nullptr, MMO->getSynchScope(),
+                                 MMO->getOrdering(), MMO->getFailureOrdering());
   return new (Allocator)
              MachineMemOperand(MachinePointerInfo(MMO->getPseudoValue(),
                                                   MMO->getOffset()+Offset),
-                               MMO->getFlags(), Size,
-                               MMO->getBaseAlignment());
+                               MMO->getFlags(), Size, MMO->getBaseAlignment(),
+                               AAMDNodes(), nullptr, MMO->getSynchScope(),
+                               MMO->getOrdering(), MMO->getFailureOrdering());
 }
 
 MachineInstr::mmo_iterator
 MachineFunction::allocateMemRefsArray(unsigned long Num) {
   return Allocator.Allocate<MachineMemOperand *>(Num);
 }
 
 std::pair<MachineInstr::mmo_iterator, MachineInstr::mmo_iterator>
if ((*I)->isLoad()) {
         // Reuse the MMO.
         Result[Index] = *I;
       else {
         // Clone the MMO and unset the store flag.
         MachineMemOperand *JustLoad =
           getMachineMemOperand((*I)->getPointerInfo(),
                                (*I)->getFlags() & ~MachineMemOperand::MOStore,
                                (*I)->getSize(), (*I)->getBaseAlignment(),
-                               (*I)->getAAInfo());
+                               (*I)->getAAInfo(), nullptr,
+                               (*I)->getSynchScope(), (*I)->getOrdering(),
+                               (*I)->getFailureOrdering());
         Result[Index] = JustLoad;
       }
       ++Index;
     }
   }
   return std::make_pair(Result, Result + Num);
 }
 
if ((*I)->isStore()) {
         // Reuse the MMO.
         Result[Index] = *I;
       else {
         // Clone the MMO and unset the load flag.
         MachineMemOperand *JustStore =
           getMachineMemOperand((*I)->getPointerInfo(),
                                (*I)->getFlags() & ~MachineMemOperand::MOLoad,
                                (*I)->getSize(), (*I)->getBaseAlignment(),
-                               (*I)->getAAInfo());
+                               (*I)->getAAInfo(), nullptr,
+                               (*I)->getSynchScope(), (*I)->getOrdering(),
+                               (*I)->getFailureOrdering());
         Result[Index] = JustStore;
       }
       ++Index;
     }
   }
   return std::make_pair(Result, Result + Num);
 }
 

llvm/trunk/lib/CodeGen/MachineInstr.cpp

 MachinePointerInfo MachinePointerInfo::getStack(MachineFunction &MF,
                                                 int64_t Offset) {
   return MachinePointerInfo(MF.getPSVManager().getStack(), Offset);
 }
 
 MachineMemOperand::MachineMemOperand(MachinePointerInfo ptrinfo, Flags f,
                                      uint64_t s, unsigned int a,
                                      const AAMDNodes &AAInfo,
-                                     const MDNode *Ranges)
+                                     const MDNode *Ranges,
+                                     SynchronizationScope SynchScope,
+                                     AtomicOrdering Ordering,
+                                     AtomicOrdering FailureOrdering)
     : PtrInfo(ptrinfo), Size(s), FlagVals(f), BaseAlignLog2(Log2_32(a) + 1),
       AAInfo(AAInfo), Ranges(Ranges) {
   assert((PtrInfo.V.isNull() || PtrInfo.V.is<const PseudoSourceValue*>() ||
           isa<PointerType>(PtrInfo.V.get<const Value*>()->getType())) &&
          "invalid pointer value");
   assert(getBaseAlignment() == a && "Alignment is not a power of 2!");
   assert((isLoad() || isStore()) && "Not a load/store!");
+
+  AtomicInfo.SynchScope = static_cast<unsigned>(SynchScope);
+  assert(getSynchScope() == SynchScope && "Value truncated");
+  AtomicInfo.Ordering = static_cast<unsigned>(Ordering);
+  assert(getOrdering() == Ordering && "Value truncated");
+  AtomicInfo.FailureOrdering = static_cast<unsigned>(FailureOrdering);
+  assert(getFailureOrdering() == FailureOrdering && "Value truncated");
 }
 
 /// Profile - Gather unique data for the object.
 ///
 void MachineMemOperand::Profile(FoldingSetNodeID &ID) const {
   ID.AddInteger(getOffset());
   ID.AddInteger(Size);
   ID.AddPointer(getOpaqueValue());

llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp

case ISD::EH_SJLJ_SETJMP:
     break;
   case ISD::ATOMIC_LOAD: {
     // There is no libcall for atomic load; fake it with ATOMIC_CMP_SWAP.
     SDValue Zero = DAG.getConstant(0, dl, Node->getValueType(0));
     SDVTList VTs = DAG.getVTList(Node->getValueType(0), MVT::Other);
     SDValue Swap = DAG.getAtomicCmpSwap(
         ISD::ATOMIC_CMP_SWAP, dl, cast<AtomicSDNode>(Node)->getMemoryVT(), VTs,
         Node->getOperand(0), Node->getOperand(1), Zero, Zero,
-        cast<AtomicSDNode>(Node)->getMemOperand(),
-        cast<AtomicSDNode>(Node)->getOrdering(),
-        cast<AtomicSDNode>(Node)->getOrdering(),
-        cast<AtomicSDNode>(Node)->getSynchScope());
+        cast<AtomicSDNode>(Node)->getMemOperand());
     Results.push_back(Swap.getValue(0));
     Results.push_back(Swap.getValue(1));
     break;
   }
   case ISD::ATOMIC_STORE: {
     // There is no libcall for atomic store; fake it with ATOMIC_SWAP.
     SDValue Swap = DAG.getAtomic(ISD::ATOMIC_SWAP, dl,
                                  cast<AtomicSDNode>(Node)->getMemoryVT(),
                                  Node->getOperand(0),
                                  Node->getOperand(1), Node->getOperand(2),
-                                 cast<AtomicSDNode>(Node)->getMemOperand(),
-                                 cast<AtomicSDNode>(Node)->getOrdering(),
-                                 cast<AtomicSDNode>(Node)->getSynchScope());
+                                 cast<AtomicSDNode>(Node)->getMemOperand());
     Results.push_back(Swap.getValue(1));
     break;
   }
   case ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS: {
     // Expanding an ATOMIC_CMP_SWAP_WITH_SUCCESS produces an ATOMIC_CMP_SWAP and
     // splits out the success value as a comparison. Expanding the resulting
     // ATOMIC_CMP_SWAP will produce a libcall.
     SDVTList VTs = DAG.getVTList(Node->getValueType(0), MVT::Other);
     SDValue Res = DAG.getAtomicCmpSwap(
         ISD::ATOMIC_CMP_SWAP, dl, cast<AtomicSDNode>(Node)->getMemoryVT(), VTs,
         Node->getOperand(0), Node->getOperand(1), Node->getOperand(2),
-        Node->getOperand(3), cast<MemSDNode>(Node)->getMemOperand(),
-        cast<AtomicSDNode>(Node)->getSuccessOrdering(),
-        cast<AtomicSDNode>(Node)->getFailureOrdering(),
-        cast<AtomicSDNode>(Node)->getSynchScope());
+        Node->getOperand(3), cast<MemSDNode>(Node)->getMemOperand());
 
     SDValue ExtRes = Res;
     SDValue LHS = Res;
     SDValue RHS = Node->getOperand(1);
 
     EVT AtomicType = cast<AtomicSDNode>(Node)->getMemoryVT();
     EVT OuterType = Node->getValueType(0);
     switch (TLI.getExtendForAtomicOps()) {

llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp

return DAG.getNode(ISD::AssertZext, SDLoc(N),
                      Op.getValueType(), Op, N->getOperand(1));
 }
 
 SDValue DAGTypeLegalizer::PromoteIntRes_Atomic0(AtomicSDNode *N) {
   EVT ResVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
   SDValue Res = DAG.getAtomic(N->getOpcode(), SDLoc(N),
                               N->getMemoryVT(), ResVT,
                               N->getChain(), N->getBasePtr(),
-                              N->getMemOperand(), N->getOrdering(),
-                              N->getSynchScope());
+                              N->getMemOperand());
   // Legalize the chain result - switch anything that used the old chain to
   // use the new one.
   ReplaceValueWith(SDValue(N, 1), Res.getValue(1));
   return Res;
 }
 
 SDValue DAGTypeLegalizer::PromoteIntRes_Atomic1(AtomicSDNode *N) {
   SDValue Op2 = GetPromotedInteger(N->getOperand(2));
   SDValue Res = DAG.getAtomic(N->getOpcode(), SDLoc(N),
                               N->getMemoryVT(),
                               N->getChain(), N->getBasePtr(),
-                              Op2, N->getMemOperand(), N->getOrdering(),
-                              N->getSynchScope());
+                              Op2, N->getMemOperand());
   // Legalize the chain result - switch anything that used the old chain to
   // use the new one.
   ReplaceValueWith(SDValue(N, 1), Res.getValue(1));
   return Res;
 }
 
 SDValue DAGTypeLegalizer::PromoteIntRes_AtomicCmpSwap(AtomicSDNode *N,
                                                       unsigned ResNo) {
   if (ResNo == 1) {
     assert(N->getOpcode() == ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS);
     EVT SVT = getSetCCResultType(N->getOperand(2).getValueType());
     EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(1));
 
     // Only use the result of getSetCCResultType if it is legal,
     // otherwise just use the promoted result type (NVT).
     if (!TLI.isTypeLegal(SVT))
       SVT = NVT;
 
     SDVTList VTs = DAG.getVTList(N->getValueType(0), SVT, MVT::Other);
     SDValue Res = DAG.getAtomicCmpSwap(
         ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS, SDLoc(N), N->getMemoryVT(), VTs,
         N->getChain(), N->getBasePtr(), N->getOperand(2), N->getOperand(3),
-        N->getMemOperand(), N->getSuccessOrdering(), N->getFailureOrdering(),
-        N->getSynchScope());
+        N->getMemOperand());
     ReplaceValueWith(SDValue(N, 0), Res.getValue(0));
     ReplaceValueWith(SDValue(N, 2), Res.getValue(2));
     return Res.getValue(1);
   }
 
   SDValue Op2 = GetPromotedInteger(N->getOperand(2));
   SDValue Op3 = GetPromotedInteger(N->getOperand(3));
   SDVTList VTs =
       DAG.getVTList(Op2.getValueType(), N->getValueType(1), MVT::Other);
   SDValue Res = DAG.getAtomicCmpSwap(
       N->getOpcode(), SDLoc(N), N->getMemoryVT(), VTs, N->getChain(),
-      N->getBasePtr(), Op2, Op3, N->getMemOperand(), N->getSuccessOrdering(),
-      N->getFailureOrdering(), N->getSynchScope());
+      N->getBasePtr(), Op2, Op3, N->getMemOperand());
   // Update the use to N with the newly created Res.
   for (unsigned i = 1, NumResults = N->getNumValues(); i < NumResults; ++i)
     ReplaceValueWith(SDValue(N, i), Res.getValue(i));
   return Res;
 }
 
 SDValue DAGTypeLegalizer::PromoteIntRes_BITCAST(SDNode *N) {
   SDValue InOp = N->getOperand(0);

 SDValue DAGTypeLegalizer::PromoteIntOp_ANY_EXTEND(SDNode *N) {
   SDValue Op = GetPromotedInteger(N->getOperand(0));
   return DAG.getNode(ISD::ANY_EXTEND, SDLoc(N), N->getValueType(0), Op);
 }
 
 SDValue DAGTypeLegalizer::PromoteIntOp_ATOMIC_STORE(AtomicSDNode *N) {
   SDValue Op2 = GetPromotedInteger(N->getOperand(2));
   return DAG.getAtomic(N->getOpcode(), SDLoc(N), N->getMemoryVT(),
-                       N->getChain(), N->getBasePtr(), Op2, N->getMemOperand(),
-                       N->getOrdering(), N->getSynchScope());
+                       N->getChain(), N->getBasePtr(), Op2, N->getMemOperand());
 }
 
 SDValue DAGTypeLegalizer::PromoteIntOp_BITCAST(SDNode *N) {
   // This should only occur in unusual situations like bitcasting to an
   // x86_fp80, so just turn it into a store+load
   return CreateStackStoreLoad(N->getOperand(0), N->getValueType(0));
 }
 
case ISD::ATOMIC_CMP_SWAP: {
     break;
   }
   case ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS: {
     AtomicSDNode *AN = cast<AtomicSDNode>(N);
     SDVTList VTs = DAG.getVTList(N->getValueType(0), MVT::Other);
     SDValue Tmp = DAG.getAtomicCmpSwap(
         ISD::ATOMIC_CMP_SWAP, SDLoc(N), AN->getMemoryVT(), VTs,
         N->getOperand(0), N->getOperand(1), N->getOperand(2), N->getOperand(3),
-        AN->getMemOperand(), AN->getSuccessOrdering(), AN->getFailureOrdering(),
-        AN->getSynchScope());
+        AN->getMemOperand());
 
     // Expanding to the strong ATOMIC_CMP_SWAP node means we can determine
     // success simply by comparing the loaded value against the ingoing
     // comparison.
     SDValue Success = DAG.getSetCC(SDLoc(N), N->getValueType(1), Tmp,
                                    N->getOperand(2), ISD::SETEQ);
 
     SplitInteger(Tmp, Lo, Hi);
void DAGTypeLegalizer::ExpandIntRes_ATOMIC_LOAD(SDNode *N,
                                                 SDValue &Lo, SDValue &Hi) {
   SDLoc dl(N);
   EVT VT = cast<AtomicSDNode>(N)->getMemoryVT();
   SDVTList VTs = DAG.getVTList(VT, MVT::i1, MVT::Other);
   SDValue Zero = DAG.getConstant(0, dl, VT);
   SDValue Swap = DAG.getAtomicCmpSwap(
       ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS, dl,
       cast<AtomicSDNode>(N)->getMemoryVT(), VTs, N->getOperand(0),
-      N->getOperand(1), Zero, Zero, cast<AtomicSDNode>(N)->getMemOperand(),
-      cast<AtomicSDNode>(N)->getOrdering(),
-      cast<AtomicSDNode>(N)->getOrdering(),
-      cast<AtomicSDNode>(N)->getSynchScope());
+      N->getOperand(1), Zero, Zero, cast<AtomicSDNode>(N)->getMemOperand());
 
   ReplaceValueWith(SDValue(N, 0), Swap.getValue(0));
   ReplaceValueWith(SDValue(N, 1), Swap.getValue(2));
 }
 
 //===----------------------------------------------------------------------===//
 //  Integer Operand Expansion
 //===----------------------------------------------------------------------===//

 }
 
 SDValue DAGTypeLegalizer::ExpandIntOp_ATOMIC_STORE(SDNode *N) {
   SDLoc dl(N);
   SDValue Swap = DAG.getAtomic(ISD::ATOMIC_SWAP, dl,
                                cast<AtomicSDNode>(N)->getMemoryVT(),
                                N->getOperand(0),
                                N->getOperand(1), N->getOperand(2),
-                               cast<AtomicSDNode>(N)->getMemOperand(),
-                               cast<AtomicSDNode>(N)->getOrdering(),
-                               cast<AtomicSDNode>(N)->getSynchScope());
+                               cast<AtomicSDNode>(N)->getMemOperand());
   return Swap.getValue(1);
 }
 
 
 SDValue DAGTypeLegalizer::PromoteIntRes_EXTRACT_SUBVECTOR(SDNode *N) {
   SDValue InOp0 = N->getOperand(0);
   EVT InVT = InOp0.getValueType();
 

llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

CLI.setDebugLoc(dl)
       .setTailCall(isTailCall);
 
   std::pair<SDValue,SDValue> CallResult = TLI->LowerCallTo(CLI);
   return CallResult.second;
 }
 
 SDValue SelectionDAG::getAtomic(unsigned Opcode, const SDLoc &dl, EVT MemVT,
                                 SDVTList VTList, ArrayRef<SDValue> Ops,
-                                MachineMemOperand *MMO,
-                                AtomicOrdering SuccessOrdering,
-                                AtomicOrdering FailureOrdering,
-                                SynchronizationScope SynchScope) {
+                                MachineMemOperand *MMO) {
   FoldingSetNodeID ID;
   ID.AddInteger(MemVT.getRawBits());
   AddNodeIDNode(ID, Opcode, VTList, Ops);
   ID.AddInteger(MMO->getPointerInfo().getAddrSpace());
   void* IP = nullptr;
   if (SDNode *E = FindNodeOrInsertPos(ID, dl, IP)) {
     cast<AtomicSDNode>(E)->refineAlignment(MMO);
     return SDValue(E, 0);
   }
 
   auto *N = newSDNode<AtomicSDNode>(Opcode, dl.getIROrder(), dl.getDebugLoc(),
-                                    VTList, MemVT, MMO, SuccessOrdering,
-                                    FailureOrdering, SynchScope);
+                                    VTList, MemVT, MMO);
   createOperands(N, Ops);
 
   CSEMap.InsertNode(N, IP);
   InsertNode(N);
   return SDValue(N, 0);
 }
 
-SDValue SelectionDAG::getAtomic(unsigned Opcode, const SDLoc &dl, EVT MemVT,
-                                SDVTList VTList, ArrayRef<SDValue> Ops,
-                                MachineMemOperand *MMO, AtomicOrdering Ordering,
-                                SynchronizationScope SynchScope) {
-  return getAtomic(Opcode, dl, MemVT, VTList, Ops, MMO, Ordering,
-                   Ordering, SynchScope);
-}
-
 SDValue SelectionDAG::getAtomicCmpSwap(
     unsigned Opcode, const SDLoc &dl, EVT MemVT, SDVTList VTs, SDValue Chain,
     SDValue Ptr, SDValue Cmp, SDValue Swp, MachinePointerInfo PtrInfo,
     unsigned Alignment, AtomicOrdering SuccessOrdering,
     AtomicOrdering FailureOrdering, SynchronizationScope SynchScope) {
   assert(Opcode == ISD::ATOMIC_CMP_SWAP ||
          Opcode == ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS);
   assert(Cmp.getValueType() == Swp.getValueType() && "Invalid Atomic Op Types");
 
   if (Alignment == 0)  // Ensure that codegen never sees alignment 0
     Alignment = getEVTAlignment(MemVT);
 
   MachineFunction &MF = getMachineFunction();
 
   // FIXME: Volatile isn't really correct; we should keep track of atomic
   // orderings in the memoperand.
   auto Flags = MachineMemOperand::MOVolatile | MachineMemOperand::MOLoad |
                MachineMemOperand::MOStore;
   MachineMemOperand *MMO =
-    MF.getMachineMemOperand(PtrInfo, Flags, MemVT.getStoreSize(), Alignment);
+    MF.getMachineMemOperand(PtrInfo, Flags, MemVT.getStoreSize(), Alignment,
+                            AAMDNodes(), nullptr, SynchScope, SuccessOrdering,
+                            FailureOrdering);
 
-  return getAtomicCmpSwap(Opcode, dl, MemVT, VTs, Chain, Ptr, Cmp, Swp, MMO,
-                          SuccessOrdering, FailureOrdering, SynchScope);
+  return getAtomicCmpSwap(Opcode, dl, MemVT, VTs, Chain, Ptr, Cmp, Swp, MMO);
 }
 
 SDValue SelectionDAG::getAtomicCmpSwap(unsigned Opcode, const SDLoc &dl,
                                        EVT MemVT, SDVTList VTs, SDValue Chain,
                                        SDValue Ptr, SDValue Cmp, SDValue Swp,
-                                       MachineMemOperand *MMO,
-                                       AtomicOrdering SuccessOrdering,
-                                       AtomicOrdering FailureOrdering,
-                                       SynchronizationScope SynchScope) {
+                                       MachineMemOperand *MMO) {
   assert(Opcode == ISD::ATOMIC_CMP_SWAP ||
          Opcode == ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS);
   assert(Cmp.getValueType() == Swp.getValueType() && "Invalid Atomic Op Types");
 
   SDValue Ops[] = {Chain, Ptr, Cmp, Swp};
-  return getAtomic(Opcode, dl, MemVT, VTs, Ops, MMO,
-                   SuccessOrdering, FailureOrdering, SynchScope);
+  return getAtomic(Opcode, dl, MemVT, VTs, Ops, MMO);
 }
 
 SDValue SelectionDAG::getAtomic(unsigned Opcode, const SDLoc &dl, EVT MemVT,
                                 SDValue Chain, SDValue Ptr, SDValue Val,
                                 const Value *PtrVal, unsigned Alignment,
                                 AtomicOrdering Ordering,
                                 SynchronizationScope SynchScope) {
   if (Alignment == 0)  // Ensure that codegen never sees alignment 0
SDValue SelectionDAG::getAtomic(unsigned Opcode, const SDLoc &dl, EVT MemVT,
   auto Flags = MachineMemOperand::MOVolatile;
   if (Opcode != ISD::ATOMIC_STORE)
     Flags |= MachineMemOperand::MOLoad;
   if (Opcode != ISD::ATOMIC_LOAD)
     Flags |= MachineMemOperand::MOStore;
 
   MachineMemOperand *MMO =
     MF.getMachineMemOperand(MachinePointerInfo(PtrVal), Flags,
-                            MemVT.getStoreSize(), Alignment);
+                            MemVT.getStoreSize(), Alignment, AAMDNodes(),
+                            nullptr, SynchScope, Ordering);
 
-  return getAtomic(Opcode, dl, MemVT, Chain, Ptr, Val, MMO,
-                   Ordering, SynchScope);
+  return getAtomic(Opcode, dl, MemVT, Chain, Ptr, Val, MMO);
 }
 
 SDValue SelectionDAG::getAtomic(unsigned Opcode, const SDLoc &dl, EVT MemVT,
                                 SDValue Chain, SDValue Ptr, SDValue Val,
-                                MachineMemOperand *MMO, AtomicOrdering Ordering,
-                                SynchronizationScope SynchScope) {
+                                MachineMemOperand *MMO) {
   assert((Opcode == ISD::ATOMIC_LOAD_ADD ||
           Opcode == ISD::ATOMIC_LOAD_SUB ||
           Opcode == ISD::ATOMIC_LOAD_AND ||
           Opcode == ISD::ATOMIC_LOAD_OR ||
           Opcode == ISD::ATOMIC_LOAD_XOR ||
           Opcode == ISD::ATOMIC_LOAD_NAND ||
           Opcode == ISD::ATOMIC_LOAD_MIN ||
           Opcode == ISD::ATOMIC_LOAD_MAX ||
           Opcode == ISD::ATOMIC_LOAD_UMIN ||
           Opcode == ISD::ATOMIC_LOAD_UMAX ||
           Opcode == ISD::ATOMIC_SWAP ||
           Opcode == ISD::ATOMIC_STORE) &&
          "Invalid Atomic Op");
 
   EVT VT = Val.getValueType();
 
   SDVTList VTs = Opcode == ISD::ATOMIC_STORE ? getVTList(MVT::Other) :
                                                getVTList(VT, MVT::Other);
   SDValue Ops[] = {Chain, Ptr, Val};
-  return getAtomic(Opcode, dl, MemVT, VTs, Ops, MMO, Ordering, SynchScope);
+  return getAtomic(Opcode, dl, MemVT, VTs, Ops, MMO);
 }
 
 SDValue SelectionDAG::getAtomic(unsigned Opcode, const SDLoc &dl, EVT MemVT,
                                 EVT VT, SDValue Chain, SDValue Ptr,
-                                MachineMemOperand *MMO, AtomicOrdering Ordering,
-                                SynchronizationScope SynchScope) {
+                                MachineMemOperand *MMO) {
   assert(Opcode == ISD::ATOMIC_LOAD && "Invalid Atomic Op");
 
   SDVTList VTs = getVTList(VT, MVT::Other);
   SDValue Ops[] = {Chain, Ptr};
-  return getAtomic(Opcode, dl, MemVT, VTs, Ops, MMO, Ordering, SynchScope);
+  return getAtomic(Opcode, dl, MemVT, VTs, Ops, MMO);
 }
 
 /// getMergeValues - Create a MERGE_VALUES node from the given operands.
 SDValue SelectionDAG::getMergeValues(ArrayRef<SDValue> Ops, const SDLoc &dl) {
   if (Ops.size() == 1)
     return Ops[0];
 
   SmallVector<EVT, 4> VTs;

llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

void SelectionDAGBuilder::visitAtomicLoad(const LoadInst &I) {
 
   MachineMemOperand *MMO =
       DAG.getMachineFunction().
       getMachineMemOperand(MachinePointerInfo(I.getPointerOperand()),
                            MachineMemOperand::MOVolatile |
                            MachineMemOperand::MOLoad,
                            VT.getStoreSize(),
                            I.getAlignment() ? I.getAlignment() :
-                                              DAG.getEVTAlignment(VT));
+                                              DAG.getEVTAlignment(VT),
+                           AAMDNodes(), nullptr, Scope, Order);
 
   InChain = TLI.prepareVolatileOrAtomicLoad(InChain, dl, DAG);
   SDValue L =
       DAG.getAtomic(ISD::ATOMIC_LOAD, dl, VT, VT, InChain,
-                    getValue(I.getPointerOperand()), MMO,
-                    Order, Scope);
+                    getValue(I.getPointerOperand()), MMO);
 
   SDValue OutChain = L.getValue(1);
 
   setValue(&I, L);
   DAG.setRoot(OutChain);
 }
 
 void SelectionDAGBuilder::visitAtomicStore(const StoreInst &I) {

llvm/trunk/lib/Target/SystemZ/SystemZISelLowering.cpp

if (MemVT == MVT::i32 || MemVT == MVT::i64) {
     } else if (Subtarget.hasInterlockedAccess1())
       // Use LAA(G) if available.
       NegSrc2 = DAG.getNode(ISD::SUB, DL, MemVT, DAG.getConstant(0, DL, MemVT),
                             Src2);
 
     if (NegSrc2.getNode())
       return DAG.getAtomic(ISD::ATOMIC_LOAD_ADD, DL, MemVT,
                            Node->getChain(), Node->getBasePtr(), NegSrc2,
-                           Node->getMemOperand(), Node->getOrdering(),
-                           Node->getSynchScope());
+                           Node->getMemOperand());
 
     // Use the node as-is.
     return Op;
   }
 
   return lowerATOMIC_LOAD_OP(Op, DAG, SystemZISD::ATOMIC_LOADW_SUB);
 }
 

llvm/trunk/lib/Target/X86/X86ISelLowering.cpp

static SDValue lowerAtomicArith(SDValue N, SelectionDAG &DAG,
   // been transformed into a cmpxchg loop in AtomicExpand.
   if (N->hasAnyUseOfValue(0)) {
     // Handle (atomic_load_sub p, v) as (atomic_load_add p, -v), to be able to
     // select LXADD if LOCK_SUB can't be selected.
     if (Opc == ISD::ATOMIC_LOAD_SUB) {
       AtomicSDNode *AN = cast<AtomicSDNode>(N.getNode());
       RHS = DAG.getNode(ISD::SUB, DL, VT, DAG.getConstant(0, DL, VT), RHS);
       return DAG.getAtomic(ISD::ATOMIC_LOAD_ADD, DL, VT, Chain, LHS,
-                           RHS, AN->getMemOperand(), AN->getOrdering(),
-                           AN->getSynchScope());
+                           RHS, AN->getMemOperand());
     }
     assert(Opc == ISD::ATOMIC_LOAD_ADD &&
            "Used AtomicRMW ops other than Add should have been expanded!");
     return N;
   }
 
   SDValue LockOp = lowerAtomicArithWithLOCK(N, DAG);
   // RAUW the chain, but don't worry about the result, as it's unused.
static SDValue LowerATOMIC_STORE(SDValue Op, SelectionDAG &DAG) {
   // FIXME: 16-byte ATOMIC_SWAP isn't actually hooked up at the moment.
   if (cast<AtomicSDNode>(Node)->getOrdering() ==
           AtomicOrdering::SequentiallyConsistent ||
       !DAG.getTargetLoweringInfo().isTypeLegal(VT)) {
     SDValue Swap = DAG.getAtomic(ISD::ATOMIC_SWAP, dl,
                                  cast<AtomicSDNode>(Node)->getMemoryVT(),
                                  Node->getOperand(0),
                                  Node->getOperand(1), Node->getOperand(2),
-                                 cast<AtomicSDNode>(Node)->getMemOperand(),
-                                 cast<AtomicSDNode>(Node)->getOrdering(),
-                                 cast<AtomicSDNode>(Node)->getSynchScope());
+                                 cast<AtomicSDNode>(Node)->getMemOperand());
     return Swap.getValue(1);
   }
   // Other atomic stores have a simple pattern.
   return Op;
 }
 
 static SDValue LowerADDC_ADDE_SUBC_SUBE(SDValue Op, SelectionDAG &DAG) {
   MVT VT = Op.getNode()->getSimpleValueType(0);