Add expand_shape to GPU encoding pipeline

Signed-off-by: Alan Li <[email protected]>

compiler/src/iree/compiler/Codegen/Common/EncodingUtils.h

@@ -20,6 +20,9 @@ struct MaterializeEncodingInfo {
   SmallVector<int64_t> innerTileSizes;
   SmallVector<int64_t> outerDimsPerm;
   unsigned srcRank = 0;
+  // Metadata for a generalized expand_shape + transpose
+  SmallVector<int64_t> innerTileShapes;
+  SmallVector<int64_t> permutation;
 };
 
 using MaterializeEncodingFn =

compiler/src/iree/compiler/Codegen/Common/GPU/BUILD.bazel

@@ -59,8 +59,8 @@ iree_compiler_cc_library(
         "GPUDistributionPatterns.cpp",
         "GPUGeneralizeNamedOps.cpp",
         "GPULowerToUKernels.cpp",
-        "GPUMultiBuffering.cpp",
         "GPUMaterializeEncoding.cpp",
+        "GPUMultiBuffering.cpp",
         "GPUNestedLayoutDistributionPatterns.cpp",
         "GPUPatterns.cpp",
         "GPUPipelining.cpp",

compiler/src/iree/compiler/Codegen/Common/GPU/GPUMaterializeEncoding.cpp

@@ -10,9 +10,13 @@
 #include "mlir/Dialect/MemRef/Transforms/Transforms.h"
 #include "mlir/Dialect/Tensor/IR/Tensor.h"
 #include "mlir/Dialect/Tensor/Transforms/Transforms.h"
+#include "mlir/Dialect/Utils/IndexingUtils.h"
+#include "mlir/Dialect/Utils/ReshapeOpsUtils.h"
 #include "mlir/IR/BuiltinTypes.h"
 #include "mlir/Transforms/GreedyPatternRewriteDriver.h"
 
+#include "mlir/IR/Operation.h"
+
 #define DEBUG_TYPE "iree-codegen-gpu-materialize-encoding"
 
 namespace mlir::iree_compiler {
@@ -33,18 +37,48 @@ static std::optional<TileMxNxK> getIntrinsicSize(TypeRange elementTypes) {
 
 // TODO: Query the value from GPU attributes.
 // TODO: Define a struct with meaningful name for the pair.
-std::optional<std::pair<int64_t, int64_t>>
-getIntrinsicVectorSize(TypeRange elementTypes, int64_t roleIdx) {
+SmallVector<int64_t> getIntrinsicVectorSize(TypeRange elementTypes,
+                                            int64_t roleIdx) {
   Type lhs = elementTypes[0];
   Type rhs = elementTypes[1];
   Type out = elementTypes[2];
   if (lhs.isF32() && rhs.isF32() && out.isF32()) {
-    if (roleIdx == 0 || roleIdx == 1)
-      return std::make_pair(1, 1);
-    if (roleIdx == 2)
-      return std::make_pair(4, 1);
+    if (roleIdx == 0 || roleIdx == 1) {
+      return {1, 1};
+    }
+    if (roleIdx == 2) {
+      return {4, 1};
+    }
+  }
+  return {};
+}
+
+// Given encoding's role index and element types, return the transpose
+// permutation used in GPU materialization.
+SmallVector<int64_t> getTransposePermutation(int64_t roleIdx,
+                                             TypeRange elementTypes) {
+  // For now, check that all types are f32:
+  Type lhs = elementTypes[0];
+  Type rhs = elementTypes[1];
+  Type out = elementTypes[2];
+  if (!lhs.isF32() || !rhs.isF32() || !out.isF32()) {
+    return {};
+  }
+
+  switch (roleIdx) {
+  case 0: // A
+  case 1: // B
+    // OuterTileX x InnerTileX x OuterTileY x InnerTileY
+    // -> OuterTileY x OuterTileX x InnerTileY x InnerTileX
+    return {2, 0, 3, 1};
+  case 2: // C
+    // ACC:
+    // OuterTileX x InnerTileX x OuterTileY x InnerTileY
+    // -> OuterTileX x OuterTileY x InnerTileX x InnerTileY
+    return {0, 2, 1, 3};
+  default:
+    return {};
   }
-  return std::nullopt;
 }
 
 // TODO(hanchung): Pass an ExecutableTargetAttr attribute for the target
@@ -93,7 +127,17 @@ materializeEncodingForTarget(RankedTensorType tensorType) {
   // Map the matmul TileMxNxK to an actual tile shape for the tensor at hand,
   // based on its operand index in the matmul.
   auto rank = tensorType.getRank();
-  return getEncodingInfoForMatmul(encoding, rank, enumeratedTileMxNxK[0]);
+
+  auto encodingInfo =
+      getEncodingInfoForMatmul(encoding, rank, enumeratedTileMxNxK[0]);
+
+  // insert inner tile shapes and permutation info
+  auto roleIdx = encoding.getOperandIndex().getInt();
+  auto intrinsicVectorSizes = getIntrinsicVectorSize(elementTypes, roleIdx);
+  auto permutation = getTransposePermutation(roleIdx, elementTypes);
+  encodingInfo.innerTileShapes = intrinsicVectorSizes;
+  encodingInfo.permutation = permutation;
+  return encodingInfo;
 }
 
 namespace {
@@ -119,6 +163,7 @@ struct GPUSetEncodingOpLoweringConversion
         getTypeConverter());
     MaterializeEncodingFn materializeEncodingFn =
         converter->getMaterializeEncodingFn();
+
     auto packOp = lowerSetEncodingOpToPackOp(
         rewriter, encodingOp, adaptor.getSource(), materializeEncodingFn,
         this->materializeEncodingValueFn);
@@ -141,6 +186,8 @@ struct GPUSetEncodingOpLoweringConversion
                                          "unhandled result encoding");
     }
     SmallVector<int64_t> innerTiles = maybeEncodingInfo->innerTileSizes;
+    SmallVector<int64_t> intrinsicVectorShape =
+        maybeEncodingInfo->innerTileShapes;
 
     // TODO(hanchung): Add a util to the encoding attribute, so we don't need
     // the map_to_vector method here.
@@ -150,10 +197,9 @@ struct GPUSetEncodingOpLoweringConversion
         encoding.getElementTypes().getValue(),
         [](Attribute a) { return cast<TypeAttr>(a).getValue(); });
     auto loc = encodingOp.getLoc();
+
     std::optional<TileMxNxK> intrinsicShape = getIntrinsicSize(elemTypes);
-    std::optional<std::pair<int64_t, int64_t>> intrinsicVectorShape =
-        getIntrinsicVectorSize(elemTypes, roleIdx);
-    if (!intrinsicShape || !intrinsicVectorShape) {
+    if (!intrinsicShape || intrinsicVectorShape.empty()) {
       return failure();
     }
 
@@ -181,50 +227,74 @@ struct GPUSetEncodingOpLoweringConversion
       assert(packedShape == targetShape);
     }
 
-    // Check that the dimensions of the matrix can be divided by the tile shape,
-    // if not then bail out.
-    auto sourceType = encodingOp.getSourceType().getShape();
-    assert(sourceType.size() == 2);
-    if (sourceType[0] % innerTiles[0] == 0 ||
-        sourceType[1] % innerTiles[1] == 0) {
-      return failure();
+    // Create expand_shape op to tile the innermost two dimensions.
+    auto sourceShape = packOp->getDestType().getShape();
+    assert(intrinsicVectorShape.size() == 2); // TODO: relax this
+    auto iT1 = intrinsicVectorShape[0];
+    auto iT2 = intrinsicVectorShape[1];
+    auto oT1 = sourceShape[2] / iT1;
+    auto oT2 = sourceShape[3] / iT2;
+    SmallVector<int64_t> expandShapeShape = {
+        sourceShape[0], sourceShape[1], oT1, iT1, oT2, iT2};
+    assert(expandShapeShape.size() == 6);
+    auto expandShapeType = RankedTensorType::get(
+        expandShapeShape, encodingOp.getSourceType().getElementType());
+
+    std::optional<SmallVector<ReassociationIndices>> reassociationMap =
+        getReassociationIndicesForReshape(packOp->getDestType(),
+                                          expandShapeType);
+    assert(reassociationMap.has_value());
+    auto expandShapeOp = rewriter.create<tensor::ExpandShapeOp>(
+        loc, expandShapeType, packOp->getResult(), *reassociationMap);
+
+    // create linalg.transpose on expandShapeShape
+    size_t origRank = origRank = encodingOp.getSourceType().getRank();
+
+    SmallVector<int64_t> transposePerm;
+    transposePerm.push_back(0);
+    transposePerm.push_back(1);
+    for (auto perm : maybeEncodingInfo->permutation) {
+      transposePerm.push_back(origRank + perm);
     }
+    SmallVector<int64_t> transposeResultDims = expandShapeShape;
+    applyPermutationToVector(transposeResultDims, transposePerm);
 
-    // Create expand_shape
-    llvm::SmallVector<int64_t> expandShapeShape;
-    auto [iM, iK] = *intrinsicVectorShape;
-    auto oM = sourceType[0] / iM;
-    auto oK = sourceType[1] / iK;
-    expandShapeShape = {oM, iM, oK, iK};
-    assert(expandShapeShape.size() == 4);
-    RankedTensorType expandShapeType =
-        RankedTensorType::Builder(encodingOp.getSourceType())
-            .setShape(expandShapeShape);
-    Value expandShapeOp = rewriter.create<tensor::ExpandShapeOp>(
-        loc, expandShapeType, packOp->getResult());
-
-    // create linalg.transpose
-    // LHS: 16x1x4x1 -> 4x16x1x1 (perm = [2, 0, 3, 1])
-    // ACC: 4x4x16x1 -> 4x16x4x1 (perm = [0, 2, 1, 3])
-    auto permutation = roleIdx == 2 ? ArrayRef<int64_t>{0, 2, 1, 3}
-                                    : ArrayRef<int64_t>{2, 0, 3, 1};
     auto emptyTensor = rewriter.create<tensor::EmptyOp>(
-        loc, expandShapeShape, encodingOp.getSourceType());
-    [[maybe_unused]] auto transposeOp = rewriter.create<linalg::TransposeOp>(
-        loc, expandShapeOp, emptyTensor, permutation);
-
-    // TODO(hanchung): We want to make the shape consistent, so we need to
-    // collpase and expand the shape. This is the shape we materialize for Flow
-    // and HAL ops.
-    // 1. Create tensor.collapse_shape.
-    //    LHS: 4x16x1x1 -> 64
-    //    ACC: 4x16x4x1 -> 256
-    // 2. Create tensor.expand_shape to recover the shape (i.e., innerTiles).
-    //    LHS: 64 -> 16x4 (innerTiles[0]xinnerTiles[1])
-    //    ACC: 256 -> 16x16 (innerTiles[0]xinnerTiles[1])
-
-    // TODO(lialan): Replace the op with the tensor.expand_shape op.
-    rewriter.replaceOp(encodingOp, packOp->getResult());
+        loc, transposeResultDims, encodingOp.getSourceType().getElementType());
+    auto transposeOp = rewriter.create<linalg::TransposeOp>(
+        loc, expandShapeOp, emptyTensor, transposePerm);
+
+    // We want to make the shape consistent, so we need to append it with a
+    // `collapse_shape` and a `expand_shape`, just to be conformant with how we
+    // materialize for Flow and HAL op.
+
+    // 1. collapse tiled dimensions into one dim
+    SmallVector<int64_t> collapsedShape = {sourceShape[0], sourceShape[1],
+                                           sourceShape[2] * sourceShape[3]};
+    auto revertShapeType = RankedTensorType::get(
+        collapsedShape, encodingOp.getSourceType().getElementType());
+
+    std::optional<SmallVector<ReassociationIndices>> collapseReassoc =
+        getReassociationIndicesForReshape(emptyTensor.getType(),
+                                          revertShapeType);
+    assert(collapseReassoc.has_value());
+
+    auto collapseShapeOp = rewriter.create<tensor::CollapseShapeOp>(
+        loc, revertShapeType, transposeOp->getResult(0), *collapseReassoc);
+
+    // 2. expand the collapsed shape to the shape intended by the encoding
+    assert(innerTiles.size() == 2); // TODO: relax this
+    auto expandTileShapeType = RankedTensorType::get(
+        {sourceShape[0], sourceShape[1], innerTiles[0], innerTiles[1]},
+        encodingOp.getSourceType().getElementType());
+    std::optional<SmallVector<ReassociationIndices>> tileAssoc =
+        getReassociationIndicesForReshape(collapseShapeOp.getType(),
+                                          expandTileShapeType);
+    assert(tileAssoc.has_value());
+    auto expandTileShapeOp = rewriter.create<tensor::ExpandShapeOp>(
+        loc, expandTileShapeType, collapseShapeOp, *tileAssoc);
+
+    rewriter.replaceOp(encodingOp, expandTileShapeOp);
     return success();
   }
 };

compiler/src/iree/compiler/Codegen/LLVMGPU/test/BUILD.bazel

@@ -37,6 +37,7 @@ iree_lit_test_suite(
             "config_winograd.mlir",
             "extract_address_computation_gpu.mlir",
             "gpu_set_num_workgroups.mlir",
+            "gpu_materialize_encoding.mlir",
             "gpu_pipeline_generalize_named_ops.mlir",
             "nvvm_extract_address_computation.mlir",
             "nvvm_pipeline_test.mlir",

compiler/src/iree/compiler/Codegen/LLVMGPU/test/CMakeLists.txt

@@ -33,6 +33,7 @@ iree_lit_test_suite(
     "distribute_to_thread.mlir"
     "elementwise_pipeline.mlir"
     "extract_address_computation_gpu.mlir"
+    "gpu_materialize_encoding.mlir"
     "gpu_pipeline_generalize_named_ops.mlir"
     "gpu_set_num_workgroups.mlir"
     "illegal_configuration.mlir"

compiler/src/iree/compiler/Codegen/LLVMGPU/test/gpu_materialize_encoding.mlir

@@ -0,0 +1,79 @@
+// RUN: iree-opt --pass-pipeline="builtin.module(func.func(iree-codegen-gpu-materialize-device-encoding))" --split-input-file %s | FileCheck %s
+
+#encoding = #iree_encoding.encoding<operand_index = 1, op_type = matmul, element_types = [f32, f32, f32], original_type = tensor<255x513xf32>,
+                                    user_indexing_maps = [affine_map<(d0, d1, d2) -> (d0, d2)>, affine_map<(d0, d1, d2) -> (d2, d1)>, affine_map<(d0, d1, d2) -> (d0, d1)>],
+                                    round_dims_to = array<i64: 16, 16, 16>>
+
+#pipeline_layout = #hal.pipeline.layout<push_constants = 0, sets = [
+  #hal.descriptor_set.layout<0, bindings = [
+    #hal.descriptor_set.binding<0, storage_buffer>,
+    #hal.descriptor_set.binding<1, storage_buffer>
+  ]>
+]>
+func.func @set_encoding_LHS() {
+  %c0 = arith.constant 0 : index
+  %0 = hal.interface.binding.subspan layout(#pipeline_layout) set(0) binding(0) alignment(64) offset(%c0) flags(ReadOnly) : !flow.dispatch.tensor<readonly:tensor<255x513xf32>>
+  %1 = hal.interface.binding.subspan layout(#pipeline_layout) set(0) binding(1) alignment(64) offset(%c0) : !flow.dispatch.tensor<writeonly:tensor<255x513xf32, #encoding>>
+  %2 = flow.dispatch.tensor.load %0, offsets = [0, 0], sizes = [255, 513], strides = [1, 1] : !flow.dispatch.tensor<readonly:tensor<255x513xf32>> -> tensor<255x513xf32>
+  %3 = iree_encoding.set_encoding %2 : tensor<255x513xf32> -> tensor<255x513xf32, #encoding>
+  flow.dispatch.tensor.store %3, %1, offsets = [0, 0], sizes = [255, 513], strides = [1, 1] : tensor<255x513xf32, #encoding> -> !flow.dispatch.tensor<writeonly:tensor<255x513xf32,  #encoding>>
+  return
+}
+
+// CHECK-LABEL: func.func @set_encoding_LHS
+// CHECK: %[[EMPTY:.*]] = tensor.empty() : tensor<33x64x16x4xf32>
+// CHECK: %[[PACK:.*]] = tensor.pack %2 padding_value(%cst : f32) outer_dims_perm = [1, 0] inner_dims_pos = [1, 0] inner_tiles = [16, 4] into %[[EMPTY]] : tensor<255x513xf32> -> tensor<33x64x16x4xf32>
+// CHECK: %[[EXPAND_LHS:.*]] = tensor.expand_shape %[[PACK]]
+// CHECK-SAME: output_shape [33, 64, 16, 1, 4, 1] : tensor<33x64x16x4xf32> into tensor<33x64x16x1x4x1xf32>
+// CHECK: %[[TRANSPOSE:.*]] = linalg.transpose ins(%[[EXPAND_LHS]]
+
+// CHECK: %[[COLLAPSE:.*]] = tensor.collapse_shape %[[TRANSPOSE]]
+// CHECK: %[[EXPAND_LHS_2:.*]] = tensor.expand_shape %[[COLLAPSE]]
+// CHECK: flow.dispatch.tensor.store %[[EXPAND_LHS_2]]
+
+//---------
+
+func.func @set_encoding_RHS() {
+  %c0 = arith.constant 0 : index
+  %0 = hal.interface.binding.subspan layout(#pipeline_layout) set(0) binding(0) alignment(64) offset(%c0) flags(ReadOnly) : !flow.dispatch.tensor<readonly:tensor<255x513xf32>>
+  %1 = hal.interface.binding.subspan layout(#pipeline_layout) set(0) binding(1) alignment(64) offset(%c0) : !flow.dispatch.tensor<writeonly:tensor<255x513xf32, #encoding>>
+  %2 = flow.dispatch.tensor.load %0, offsets = [0, 0], sizes = [255, 513], strides = [1, 1] : !flow.dispatch.tensor<readonly:tensor<255x513xf32>> -> tensor<255x513xf32>
+  %3 = iree_encoding.set_encoding %2 : tensor<255x513xf32> -> tensor<255x513xf32, #encoding>
+  flow.dispatch.tensor.store %3, %1, offsets = [0, 0], sizes = [255, 513], strides = [1, 1] : tensor<255x513xf32, #encoding> -> !flow.dispatch.tensor<writeonly:tensor<255x513xf32,  #encoding>>
+  return
+}
+
+// CHECK-LABEL: func.func @set_encoding_RHS
+// CHECK: %[[EMPTY_RHS:.*]] = tensor.empty() : tensor<33x64x16x4xf32>
+// CHECK: %[[PACK_RHS:.*]] = tensor.pack %2 padding_value(%cst : f32) outer_dims_perm = [1, 0] inner_dims_pos = [1, 0] inner_tiles = [16, 4] into %3 : tensor<255x513xf32> -> tensor<33x64x16x4xf32>
+// CHECK: %[[EXPAND_RHS:.*]] = tensor.expand_shape %[[PACK_RHS]]
+// CHECK-SAME: output_shape [33, 64, 16, 1, 4, 1] : tensor<33x64x16x4xf32> into tensor<33x64x16x1x4x1xf32>
+// CHECK: %[[EMPTY_RHS2:.*]] = tensor.empty() : tensor<33x64x4x16x1x1xf32>
+// CHECK: %[[TRANSPOSE_RHS:.*]] = linalg.transpose ins(%[[EXPAND_RHS]]
+
+// CHECK: %[[COLLAPSE_RHS:.*]] = tensor.collapse_shape %[[TRANSPOSE_RHS]]
+// CHECK: %[[EXPAND_RHS_2:.*]] = tensor.expand_shape %[[COLLAPSE_RHS]]
+// CHECK: flow.dispatch.tensor.store %[[EXPAND_RHS_2]]
+
+//---------
+
+func.func @set_encoding_ACC() {
+  %c0 = arith.constant 0 : index
+  %0 = hal.interface.binding.subspan layout(#pipeline_layout) set(0) binding(0) alignment(64) offset(%c0) flags(ReadOnly) : !flow.dispatch.tensor<readonly:tensor<255x513xf32>>
+  %1 = hal.interface.binding.subspan layout(#pipeline_layout) set(0) binding(1) alignment(64) offset(%c0) : !flow.dispatch.tensor<writeonly:tensor<255x513xf32, #encoding>>
+  %2 = flow.dispatch.tensor.load %0, offsets = [0, 0], sizes = [255, 513], strides = [1, 1] : !flow.dispatch.tensor<readonly:tensor<255x513xf32>> -> tensor<255x513xf32>
+  %3 = iree_encoding.set_encoding %2 : tensor<255x513xf32> -> tensor<255x513xf32, #encoding>
+  flow.dispatch.tensor.store %3, %1, offsets = [0, 0], sizes = [255, 513], strides = [1, 1] : tensor<255x513xf32, #encoding> -> !flow.dispatch.tensor<writeonly:tensor<255x513xf32,  #encoding>>
+  return
+}
+
+// CHECK-LABEL: func.func @set_encoding_ACC
+// CHECK: %[[EMPTY_ACC:.*]] = tensor.empty() : tensor<33x64x16x4xf32>
+// CHECK: %[[PACK_ACC:.*]] = tensor.pack %2 padding_value(%cst : f32) outer_dims_perm = [1, 0] inner_dims_pos = [1, 0] inner_tiles = [16, 4] into %[[EMPTY_ACC]] : tensor<255x513xf32> -> tensor<33x64x16x4xf32>
+// CHECK: %[[EXPAND_ACC:.*]] = tensor.expand_shape %[[PACK_ACC]]
+// CHECK: %[[EMPTY_ACC2:.*]] = tensor.empty() : tensor<33x64x4x16x1x1xf32>
+// CHECK: %[[TRANSPOSE_ACC:.*]] = linalg.transpose ins(%[[EXPAND_ACC]] : tensor<33x64x16x1x4x1xf32>) outs(%[[EMPTY_ACC2]] : tensor<33x64x4x16x1x1xf32>) permutation = [0, 1, 4, 2, 5, 3] 
+
+// CHECK: %[[COLLAPSE_RHS:.*]] = tensor.collapse_shape %[[TRANSPOSE_ACC]]
+// CHECK: %[[EXPAND_ACC_2:.*]] = tensor.expand_shape %[[COLLAPSE_RHS]]
+// CHECK: flow.dispatch.tensor.store %[[EXPAND_ACC_2]]