[TTI] Use MemIntrinsicCostAttributes for getExpandCompressMemoryOpCost (llvm#168677)

- Following llvm#168029. This is a step toward a unified interface for
masked/gather-scatter/strided/expand-compress cost modeling.
- Replace the ad-hoc parameter list with a single attributes object.

API change:
```
- InstructionCost getExpandCompressMemoryOpCost(Opcode, DataTy,
-                                               VariableMask, Alignment,
-                                               CostKind, Inst);

+ InstructionCost getExpandCompressMemoryOpCost(MemIntrinsicCostAttributes,
+                                               CostKind);
```

Notes:
- NFCI intended: callers populate MemIntrinsicCostAttributes with same
information as before.

Author: arcbbb

llvm/include/llvm/Analysis/TargetTransformInfo.h

@@ -125,12 +125,20 @@ struct HardwareLoopInfo {
 
 /// Information for memory intrinsic cost model.
 class MemIntrinsicCostAttributes {
+  /// Optional context instruction, if one exists, e.g. the
+  /// load/store to transform to the intrinsic.
+  const Instruction *I = nullptr;
+
   /// Vector type of the data to be loaded or stored.
   Type *DataTy = nullptr;
 
   /// ID of the memory intrinsic.
   Intrinsic::ID IID;
 
+  /// True when the memory access is predicated with a mask
+  /// that is not a compile-time constant.
+  bool VariableMask = true;
+
   /// Address space of the pointer.
   unsigned AddressSpace = 0;
 
@@ -143,8 +151,16 @@ class MemIntrinsicCostAttributes {
       : DataTy(DataTy), IID(Id), AddressSpace(AddressSpace),
         Alignment(Alignment) {}
 
+  LLVM_ABI MemIntrinsicCostAttributes(Intrinsic::ID Id, Type *DataTy,
+                                      bool VariableMask, Align Alignment,
+                                      const Instruction *I = nullptr)
+      : I(I), DataTy(DataTy), IID(Id), VariableMask(VariableMask),
+        Alignment(Alignment) {}
+
   Intrinsic::ID getID() const { return IID; }
+  const Instruction *getInst() const { return I; }
   Type *getDataType() const { return DataTy; }
+  bool getVariableMask() const { return VariableMask; }
   unsigned getAddressSpace() const { return AddressSpace; }
   Align getAlignment() const { return Alignment; }
 };
@@ -1612,17 +1628,9 @@ class TargetTransformInfo {
       const Instruction *I = nullptr) const;
 
   /// \return The cost of Expand Load or Compress Store operation
-  /// \p Opcode - is a type of memory access Load or Store
-  /// \p Src - a vector type of the data to be loaded or stored
-  /// \p VariableMask - true when the memory access is predicated with a mask
-  ///                   that is not a compile-time constant
-  /// \p Alignment - alignment of single element
-  /// \p I - the optional original context instruction, if one exists, e.g. the
-  ///        load/store to transform or the call to the gather/scatter intrinsic
   LLVM_ABI InstructionCost getExpandCompressMemoryOpCost(
-      unsigned Opcode, Type *DataTy, bool VariableMask, Align Alignment,
-      TTI::TargetCostKind CostKind = TTI::TCK_RecipThroughput,
-      const Instruction *I = nullptr) const;
+      const MemIntrinsicCostAttributes &MICA,
+      TTI::TargetCostKind CostKind = TTI::TCK_RecipThroughput) const;
 
   /// \return The cost of strided memory operations.
   /// \p Opcode - is a type of memory access Load or Store

llvm/include/llvm/Analysis/TargetTransformInfoImpl.h

@@ -859,9 +859,9 @@ class TargetTransformInfoImplBase {
     return 1;
   }
 
-  virtual InstructionCost getExpandCompressMemoryOpCost(
-      unsigned Opcode, Type *DataTy, bool VariableMask, Align Alignment,
-      TTI::TargetCostKind CostKind, const Instruction *I = nullptr) const {
+  virtual InstructionCost
+  getExpandCompressMemoryOpCost(const MemIntrinsicCostAttributes &MICA,
+                                TTI::TargetCostKind CostKind) const {
     return 1;
   }
 

llvm/include/llvm/CodeGen/BasicTTIImpl.h

@@ -1580,10 +1580,14 @@ class BasicTTIImplBase : public TargetTransformInfoImplCRTPBase<T> {
   }
 
   InstructionCost
-  getExpandCompressMemoryOpCost(unsigned Opcode, Type *DataTy,
-                                bool VariableMask, Align Alignment,
-                                TTI::TargetCostKind CostKind,
-                                const Instruction *I = nullptr) const override {
+  getExpandCompressMemoryOpCost(const MemIntrinsicCostAttributes &MICA,
+                                TTI::TargetCostKind CostKind) const override {
+    unsigned Opcode = MICA.getID() == Intrinsic::masked_expandload
+                          ? Instruction::Load
+                          : Instruction::Store;
+    Type *DataTy = MICA.getDataType();
+    bool VariableMask = MICA.getVariableMask();
+    Align Alignment = MICA.getAlignment();
     // Treat expand load/compress store as gather/scatter operation.
     // TODO: implement more precise cost estimation for these intrinsics.
     return getCommonMaskedMemoryOpCost(Opcode, DataTy, Alignment, VariableMask,
@@ -1964,15 +1968,17 @@ class BasicTTIImplBase : public TargetTransformInfoImplCRTPBase<T> {
       const Value *Mask = Args[2];
       Align Alignment = I->getParamAlign(1).valueOrOne();
       return thisT()->getExpandCompressMemoryOpCost(
-          Instruction::Store, Data->getType(), !isa<Constant>(Mask), Alignment,
-          CostKind, I);
+          MemIntrinsicCostAttributes(IID, Data->getType(), !isa<Constant>(Mask),
+                                     Alignment, I),
+          CostKind);
     }
     case Intrinsic::masked_expandload: {
       const Value *Mask = Args[1];
       Align Alignment = I->getParamAlign(0).valueOrOne();
-      return thisT()->getExpandCompressMemoryOpCost(Instruction::Load, RetTy,
-                                                    !isa<Constant>(Mask),
-                                                    Alignment, CostKind, I);
+      return thisT()->getExpandCompressMemoryOpCost(
+          MemIntrinsicCostAttributes(IID, RetTy, !isa<Constant>(Mask),
+                                     Alignment, I),
+          CostKind);
     }
     case Intrinsic::experimental_vp_strided_store: {
       const Value *Data = Args[0];

llvm/lib/Analysis/TargetTransformInfo.cpp

@@ -1209,10 +1209,9 @@ InstructionCost TargetTransformInfo::getGatherScatterOpCost(
 }
 
 InstructionCost TargetTransformInfo::getExpandCompressMemoryOpCost(
-    unsigned Opcode, Type *DataTy, bool VariableMask, Align Alignment,
-    TTI::TargetCostKind CostKind, const Instruction *I) const {
-  InstructionCost Cost = TTIImpl->getExpandCompressMemoryOpCost(
-      Opcode, DataTy, VariableMask, Alignment, CostKind, I);
+    const MemIntrinsicCostAttributes &MICA,
+    TTI::TargetCostKind CostKind) const {
+  InstructionCost Cost = TTIImpl->getExpandCompressMemoryOpCost(MICA, CostKind);
   assert(Cost >= 0 && "TTI should not produce negative costs!");
   return Cost;
 }

llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp

@@ -1146,15 +1146,20 @@ InstructionCost RISCVTTIImpl::getGatherScatterOpCost(
 }
 
 InstructionCost RISCVTTIImpl::getExpandCompressMemoryOpCost(
-    unsigned Opcode, Type *DataTy, bool VariableMask, Align Alignment,
-    TTI::TargetCostKind CostKind, const Instruction *I) const {
+    const MemIntrinsicCostAttributes &MICA,
+    TTI::TargetCostKind CostKind) const {
+  unsigned Opcode = MICA.getID() == Intrinsic::masked_expandload
+                        ? Instruction::Load
+                        : Instruction::Store;
+  Type *DataTy = MICA.getDataType();
+  bool VariableMask = MICA.getVariableMask();
+  Align Alignment = MICA.getAlignment();
   bool IsLegal = (Opcode == Instruction::Store &&
                   isLegalMaskedCompressStore(DataTy, Alignment)) ||
                  (Opcode == Instruction::Load &&
                   isLegalMaskedExpandLoad(DataTy, Alignment));
   if (!IsLegal || CostKind != TTI::TCK_RecipThroughput)
-    return BaseT::getExpandCompressMemoryOpCost(Opcode, DataTy, VariableMask,
-                                                Alignment, CostKind, I);
+    return BaseT::getExpandCompressMemoryOpCost(MICA, CostKind);
   // Example compressstore sequence:
   // vsetivli        zero, 8, e32, m2, ta, ma (ignored)
   // vcompress.vm    v10, v8, v0

llvm/lib/Target/RISCV/RISCVTargetTransformInfo.h

@@ -197,9 +197,8 @@ class RISCVTTIImpl final : public BasicTTIImplBase<RISCVTTIImpl> {
                                          const Instruction *I) const override;
 
   InstructionCost
-  getExpandCompressMemoryOpCost(unsigned Opcode, Type *Src, bool VariableMask,
-                                Align Alignment, TTI::TargetCostKind CostKind,
-                                const Instruction *I = nullptr) const override;
+  getExpandCompressMemoryOpCost(const MemIntrinsicCostAttributes &MICA,
+                                TTI::TargetCostKind CostKind) const override;
 
   InstructionCost getStridedMemoryOpCost(unsigned Opcode, Type *DataTy,
                                          const Value *Ptr, bool VariableMask,