[Openmp-commits] [openmp] [Flang][OpenMP][MLIR] Initial array section mapping MLIR -> LLVM-IR lowering utilising omp.bounds (PR #68689)

[via Openmp-commits]

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@@ -1642,13 +1635,165 @@ getRefPtrIfDeclareTarget(mlir::Value value,
   return nullptr;
 }
 
+// A small helper structure to contain data gathered
+// for map lowering and coalese it into one area and
+// avoiding extra computations such as searches in the
+// llvm module for lowered mapped varibles or checking
+// if something is declare target (and retrieving the
+// value) more than neccessary.
+struct MapInfoData : llvm::OpenMPIRBuilder::MapInfosTy {
+  llvm::SmallVector<bool, 4> IsDeclareTarget;
+  llvm::SmallVector<mlir::Operation *, 4> MapClause;
+  llvm::SmallVector<llvm::Value *, 4> OriginalValue;
+  // Stripped off array/pointer to get the underlying
+  // element type
+  llvm::SmallVector<llvm::Type *, 4> BaseType;
+
+  /// Append arrays in \a CurInfo.
+  void append(MapInfoData &CurInfo) {
+    IsDeclareTarget.append(CurInfo.IsDeclareTarget.begin(),
+                           CurInfo.IsDeclareTarget.end());
+    MapClause.append(CurInfo.MapClause.begin(), CurInfo.MapClause.end());
+    OriginalValue.append(CurInfo.OriginalValue.begin(),
+                         CurInfo.OriginalValue.end());
+    BaseType.append(CurInfo.BaseType.begin(), CurInfo.BaseType.end());
+    llvm::OpenMPIRBuilder::MapInfosTy::append(CurInfo);
+  }
+};
+
+uint64_t getArrayElementSizeInBits(LLVM::LLVMArrayType arrTy, DataLayout &dl) {
+  if (auto nestedArrTy = llvm::dyn_cast_if_present<LLVM::LLVMArrayType>(
+          arrTy.getElementType()))
+    return getArrayElementSizeInBits(nestedArrTy, dl);
+  return dl.getTypeSizeInBits(arrTy.getElementType());
+}
+
+// This function calculates the size to be offloaded for a specified type, given
+// its associated map clause (which can contain bounds information which affects
+// the total size), this size is calculated based on the underlying element type
+// e.g. given a 1-D array of ints, we will calculate the size from the integer
+// type * number of elements in the array. This size can be used in other
+// calculations but is ultimately used as an argument to the OpenMP runtimes
+// kernel argument structure which is generated through the combinedInfo data
+// structures.
+// This function is somewhat equivalent to Clang's getExprTypeSize inside of
+// CGOpenMPRuntime.cpp.
+llvm::Value *getSizeInBytes(DataLayout &dl, const mlir::Type &type,
+                            Operation *clauseOp, llvm::IRBuilderBase &builder,
+                            LLVM::ModuleTranslation &moduleTranslation) {
+  // utilising getTypeSizeInBits instead of getTypeSize as getTypeSize gives
+  // the size in inconsistent byte or bit format.
+  uint64_t underlyingTypeSzInBits = dl.getTypeSizeInBits(type);
+  if (auto ptrTy = llvm::dyn_cast_if_present<LLVM::LLVMPointerType>(type)) {
+    underlyingTypeSzInBits = dl.getTypeSizeInBits(ptrTy.getElementType());
+    if (auto arrTy = llvm::dyn_cast_if_present<LLVM::LLVMArrayType>(
+            ptrTy.getElementType())) {
+      underlyingTypeSzInBits = getArrayElementSizeInBits(arrTy, dl);
+    }
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agozillon wrote:

In this case it's actually covered by the default case, it will calculate the full structure size in bits. We primarily just need the `if` to get the element type size to calculate the array size when using bounds. 

If we ever wish to drop the default bounds generation for arrays, we'd have to alter this segment slightly to get full array size calculation, but that wouldn't be too difficult. 

https://github.com/llvm/llvm-project/pull/68689