[Mlir-commits] [mlir] [mlir][linalg] Decompose winograd operators (PR #96183)

[Hsiangkai Wang]

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@@ -38,6 +191,329 @@ constexpr TransformMapKeyTy F_2_3{2, 3};
 constexpr TransformMapKeyTy F_4_3{4, 3};
 constexpr TransformMapKeyTy F_2_5{2, 5};
 
+/// Structure to keep information of constant transform matrices.
+struct TransformMatrix {
+  TransformMatrix(const float *table, int64_t rows, int64_t cols,
+                  int64_t scalarFactor = 1)
+      : table(table), rows(rows), cols(cols), scalarFactor(scalarFactor) {}
+
+  const float *table;
+  int64_t rows;
+  int64_t cols;
+  int64_t scalarFactor;
+};
+
+/// Utility function to convert constant array to arith.constant Value.
+Value create2DTransformMatrix(OpBuilder &builder, Location loc,
+                              TransformMatrix transform, Type type) {
+  ArrayRef<float> constVec(transform.table, transform.rows * transform.cols);
+
+  return builder.create<arith::ConstantOp>(
+      loc, DenseFPElementsAttr::get(
+               RankedTensorType::get(
+                   SmallVector<int64_t>{transform.rows, transform.cols}, type),
+               constVec));
+}
+
+/// Extract height x width data from 4D or 6D tensors.
+Value extract2DData(OpBuilder &builder, Location loc, Value source,
+                    Value outLoopIndex, Value inLoopIndex, int64_t outLoopIdx,
+                    int64_t inLoopIdx, int64_t heightIdx, int64_t widthIdx,
+                    int64_t srcSize) {
+  auto sourceType = cast<ShapedType>(source.getType());
+  Type elementType = sourceType.getElementType();
+  auto sourceShape = sourceType.getShape();
+  int64_t height = sourceShape[heightIdx];
+  int64_t width = sourceShape[widthIdx];
+
+  auto zeroIndex = builder.getIndexAttr(0);
+  auto oneIndex = builder.getIndexAttr(1);
+  SmallVector<OpFoldResult, 6> offsets(srcSize, zeroIndex);
+  offsets[outLoopIdx] = outLoopIndex;
+  offsets[inLoopIdx] = inLoopIndex;
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Hsiangkai wrote:

I renamed them to `loopNorFIndex` and `loopCorFIndex`.

https://github.com/llvm/llvm-project/pull/96183