[llvm] [mlir] [mlir] Implement Mesh's ShardingInterface for Linalg ops (PR #82284)
via llvm-commits
llvm-commits at lists.llvm.org
Mon Feb 19 14:35:58 PST 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-mlir-linalg
Author: Boian Petkantchin (sogartar)
<details>
<summary>Changes</summary>
Allows linalg structured operations to be handled during spmdization and sharding propagation.
There is only support for projected permutation indexing maps.
---
Patch is 41.14 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/82284.diff
16 Files Affected:
- (added) mlir/include/mlir/Dialect/Linalg/Transforms/AllInterfaces.h (+26)
- (added) mlir/include/mlir/Dialect/Linalg/Transforms/MeshShardingInterfaceImpl.h (+20)
- (modified) mlir/include/mlir/Dialect/Mesh/IR/MeshBase.td (+6)
- (modified) mlir/include/mlir/Dialect/Mesh/IR/MeshOps.td (+4)
- (modified) mlir/include/mlir/Dialect/Mesh/Interfaces/ShardingInterfaceImpl.h (+18)
- (modified) mlir/include/mlir/Dialect/Mesh/Transforms/Transforms.h (+6)
- (modified) mlir/include/mlir/InitAllDialects.h (+2-8)
- (added) mlir/lib/Dialect/Linalg/Transforms/AllInterfaces.cpp (+24)
- (modified) mlir/lib/Dialect/Linalg/Transforms/CMakeLists.txt (+5)
- (added) mlir/lib/Dialect/Linalg/Transforms/MeshShardingInterfaceImpl.cpp (+336)
- (modified) mlir/lib/Dialect/Linalg/Transforms/TilingInterfaceImpl.cpp (-8)
- (modified) mlir/lib/Dialect/Mesh/IR/MeshOps.cpp (+7)
- (modified) mlir/lib/Dialect/Mesh/Interfaces/ShardingInterface.cpp (+79)
- (modified) mlir/lib/Dialect/Mesh/Transforms/Transforms.cpp (+13)
- (added) mlir/test/Dialect/Linalg/mesh-spmdization.mlir (+165)
- (modified) utils/bazel/llvm-project-overlay/mlir/BUILD.bazel (+3)
``````````diff
diff --git a/mlir/include/mlir/Dialect/Linalg/Transforms/AllInterfaces.h b/mlir/include/mlir/Dialect/Linalg/Transforms/AllInterfaces.h
new file mode 100644
index 00000000000000..a69751e072b797
--- /dev/null
+++ b/mlir/include/mlir/Dialect/Linalg/Transforms/AllInterfaces.h
@@ -0,0 +1,26 @@
+//===- AllInterfaces.h - ----------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines a common entry point for registering all external
+// interface implementations to the linalg dialect.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef MLIR_DIALECT_LINALG_TRANSFORMS_ALLINTERFACES_H
+#define MLIR_DIALECT_LINALG_TRANSFORMS_ALLINTERFACES_H
+
+namespace mlir {
+class DialectRegistry;
+
+namespace linalg {
+void registerAllDialectInterfaceImplementations(DialectRegistry ®istry);
+} // namespace linalg
+
+} // namespace mlir
+
+#endif // MLIR_DIALECT_LINALG_TRANSFORMS_ALLINTERFACES_H
diff --git a/mlir/include/mlir/Dialect/Linalg/Transforms/MeshShardingInterfaceImpl.h b/mlir/include/mlir/Dialect/Linalg/Transforms/MeshShardingInterfaceImpl.h
new file mode 100644
index 00000000000000..c57501ea86b7ed
--- /dev/null
+++ b/mlir/include/mlir/Dialect/Linalg/Transforms/MeshShardingInterfaceImpl.h
@@ -0,0 +1,20 @@
+//===- MeshShardingInterfaceImpl.h ----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef MLIR_DIALECT_LINALG_MESHSHARDINGINTERFACEIMPL_H
+#define MLIR_DIALECT_LINALG_MESHSHARDINGINTERFACEIMPL_H
+
+namespace mlir {
+class DialectRegistry;
+
+namespace linalg {
+void registerMeshShardingInterfaceExternalModels(DialectRegistry ®istry);
+} // namespace linalg
+} // namespace mlir
+
+#endif // MLIR_DIALECT_LINALG_MESHSHARDINGINTERFACEIMPL_H
diff --git a/mlir/include/mlir/Dialect/Mesh/IR/MeshBase.td b/mlir/include/mlir/Dialect/Mesh/IR/MeshBase.td
index fc2acc70381ef7..9d9b5892e1a51f 100644
--- a/mlir/include/mlir/Dialect/Mesh/IR/MeshBase.td
+++ b/mlir/include/mlir/Dialect/Mesh/IR/MeshBase.td
@@ -46,6 +46,12 @@ def Mesh_ReductionKind : I32EnumAttr<"ReductionKind",
I32EnumAttrCase<"Sum", 1, "sum">,
I32EnumAttrCase<"Max", 2, "max">,
I32EnumAttrCase<"Min", 3, "min">,
+ I32EnumAttrCase<"Product", 4, "product">,
+ // Arithmetic mean.
+ I32EnumAttrCase<"Average", 5, "average">,
+ I32EnumAttrCase<"BitwiseAnd", 6, "bitwise_and">,
+ I32EnumAttrCase<"BitwiseOr", 7, "bitwise_or">,
+ I32EnumAttrCase<"BitwiseXor", 8, "bitwise_xor">,
I32EnumAttrCase<"Generic", 100, "generic">
]> {
let genSpecializedAttr = 0;
diff --git a/mlir/include/mlir/Dialect/Mesh/IR/MeshOps.td b/mlir/include/mlir/Dialect/Mesh/IR/MeshOps.td
index 8ba7c111aea6bb..19020c29459821 100644
--- a/mlir/include/mlir/Dialect/Mesh/IR/MeshOps.td
+++ b/mlir/include/mlir/Dialect/Mesh/IR/MeshOps.td
@@ -340,6 +340,10 @@ def Mesh_AllReduceOp : Mesh_CollectiveCommunicationOpBase<"all_reduce", [
attr-dict `:` type($input) `->` type($result)
}];
let hasCanonicalizer = 1;
+ let builders = [
+ OpBuilder<(ins "Value":$input, "StringRef":$mesh,
+ "ArrayRef<MeshAxis>":$meshAxes, "ReductionKind":$reduction)>
+ ];
}
def Mesh_AllSliceOp : Mesh_CollectiveCommunicationOpBase<"all_slice", [
diff --git a/mlir/include/mlir/Dialect/Mesh/Interfaces/ShardingInterfaceImpl.h b/mlir/include/mlir/Dialect/Mesh/Interfaces/ShardingInterfaceImpl.h
index ffc9b6fb18be53..ab4df2ab028d43 100644
--- a/mlir/include/mlir/Dialect/Mesh/Interfaces/ShardingInterfaceImpl.h
+++ b/mlir/include/mlir/Dialect/Mesh/Interfaces/ShardingInterfaceImpl.h
@@ -22,6 +22,24 @@ class SymbolTableCollection;
namespace mesh {
+// Retrieve the mesh axes corresponding to each operation loop iterator based
+// on the provided shardings for the op's operands and results.
+// Assumes that the indexingMaps are projected permutations.
+ShardingArray getMeshAxisAssignmentForLoopIterators(
+ ArrayRef<MeshShardingAttr> operandShardings,
+ ArrayRef<MeshShardingAttr> resultShardings,
+ ArrayRef<utils::IteratorType> loopIteratorTypes,
+ ArrayRef<AffineMap> indexingMaps);
+
+bool isAtLeastOneReductionIteratorSharded(
+ ArrayRef<utils::IteratorType> loopIteratorTypes,
+ ArrayRef<SmallVector<MeshAxis>> meshAxisAssignmentForLoopIterators);
+
+// Get the set of mesh axes that correspond to reduction loop iterators.
+SmallVector<MeshAxis> getReductionMeshAxes(
+ ArrayRef<utils::IteratorType> loopIteratorTypes,
+ ArrayRef<SmallVector<MeshAxis>> meshAxisAssignmentForLoopIterators);
+
// Inserts a clone of the operation that has all ranked tensor
// arguments/results sharded.
void spmdizeTriviallyShardableOperation(
diff --git a/mlir/include/mlir/Dialect/Mesh/Transforms/Transforms.h b/mlir/include/mlir/Dialect/Mesh/Transforms/Transforms.h
index aeab28961a4e1e..be82e2af399dc8 100644
--- a/mlir/include/mlir/Dialect/Mesh/Transforms/Transforms.h
+++ b/mlir/include/mlir/Dialect/Mesh/Transforms/Transforms.h
@@ -13,6 +13,7 @@
#include "mlir/IR/BuiltinTypes.h"
#include "mlir/IR/Value.h"
#include "mlir/Support/LLVM.h"
+#include "llvm/ADT/ArrayRef.h"
namespace mlir {
class RewritePatternSet;
@@ -37,6 +38,11 @@ TypedValue<IndexType>
createCollectiveProcessGroupSize(MeshOp mesh, ArrayRef<MeshAxis> axes,
ImplicitLocOpBuilder &builder);
+// Get process linear index along the given mesh axes.
+TypedValue<IndexType> createProcessLinearIndex(StringRef mesh,
+ ArrayRef<MeshAxis> meshAxes,
+ ImplicitLocOpBuilder &builder);
+
} // namespace mesh
} // namespace mlir
diff --git a/mlir/include/mlir/InitAllDialects.h b/mlir/include/mlir/InitAllDialects.h
index e508d51205f347..04fc0f906a8fc4 100644
--- a/mlir/include/mlir/InitAllDialects.h
+++ b/mlir/include/mlir/InitAllDialects.h
@@ -43,10 +43,7 @@
#include "mlir/Dialect/LLVMIR/NVVMDialect.h"
#include "mlir/Dialect/LLVMIR/ROCDLDialect.h"
#include "mlir/Dialect/Linalg/IR/Linalg.h"
-#include "mlir/Dialect/Linalg/IR/ValueBoundsOpInterfaceImpl.h"
-#include "mlir/Dialect/Linalg/Transforms/BufferizableOpInterfaceImpl.h"
-#include "mlir/Dialect/Linalg/Transforms/SubsetInsertionOpInterfaceImpl.h"
-#include "mlir/Dialect/Linalg/Transforms/TilingInterfaceImpl.h"
+#include "mlir/Dialect/Linalg/Transforms/AllInterfaces.h"
#include "mlir/Dialect/MLProgram/IR/MLProgram.h"
#include "mlir/Dialect/MLProgram/Transforms/BufferizableOpInterfaceImpl.h"
#include "mlir/Dialect/MPI/IR/MPI.h"
@@ -155,10 +152,7 @@ inline void registerAllDialects(DialectRegistry ®istry) {
cf::registerBufferizableOpInterfaceExternalModels(registry);
cf::registerBufferDeallocationOpInterfaceExternalModels(registry);
gpu::registerBufferDeallocationOpInterfaceExternalModels(registry);
- linalg::registerBufferizableOpInterfaceExternalModels(registry);
- linalg::registerSubsetOpInterfaceExternalModels(registry);
- linalg::registerTilingInterfaceExternalModels(registry);
- linalg::registerValueBoundsOpInterfaceExternalModels(registry);
+ linalg::registerAllDialectInterfaceImplementations(registry);
memref::registerAllocationOpInterfaceExternalModels(registry);
memref::registerRuntimeVerifiableOpInterfaceExternalModels(registry);
memref::registerValueBoundsOpInterfaceExternalModels(registry);
diff --git a/mlir/lib/Dialect/Linalg/Transforms/AllInterfaces.cpp b/mlir/lib/Dialect/Linalg/Transforms/AllInterfaces.cpp
new file mode 100644
index 00000000000000..cc9f8d23231ee1
--- /dev/null
+++ b/mlir/lib/Dialect/Linalg/Transforms/AllInterfaces.cpp
@@ -0,0 +1,24 @@
+//===- AllInterfaces.cpp - --------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "mlir/Dialect/Linalg/Transforms/AllInterfaces.h"
+
+#include "mlir/Dialect/Linalg/IR/ValueBoundsOpInterfaceImpl.h"
+#include "mlir/Dialect/Linalg/Transforms/BufferizableOpInterfaceImpl.h"
+#include "mlir/Dialect/Linalg/Transforms/MeshShardingInterfaceImpl.h"
+#include "mlir/Dialect/Linalg/Transforms/SubsetInsertionOpInterfaceImpl.h"
+#include "mlir/Dialect/Linalg/Transforms/TilingInterfaceImpl.h"
+
+void mlir::linalg::registerAllDialectInterfaceImplementations(
+ DialectRegistry ®istry) {
+ registerBufferizableOpInterfaceExternalModels(registry);
+ registerMeshShardingInterfaceExternalModels(registry);
+ registerSubsetOpInterfaceExternalModels(registry);
+ registerTilingInterfaceExternalModels(registry);
+ registerValueBoundsOpInterfaceExternalModels(registry);
+}
diff --git a/mlir/lib/Dialect/Linalg/Transforms/CMakeLists.txt b/mlir/lib/Dialect/Linalg/Transforms/CMakeLists.txt
index 4f47e3b8718454..513c54de5d7bfc 100644
--- a/mlir/lib/Dialect/Linalg/Transforms/CMakeLists.txt
+++ b/mlir/lib/Dialect/Linalg/Transforms/CMakeLists.txt
@@ -1,4 +1,5 @@
add_mlir_dialect_library(MLIRLinalgTransforms
+ AllInterfaces.cpp
BubbleUpExtractSlice.cpp
BufferizableOpInterfaceImpl.cpp
Bufferize.cpp
@@ -21,6 +22,7 @@ add_mlir_dialect_library(MLIRLinalgTransforms
InlineScalarOperands.cpp
Interchange.cpp
Loops.cpp
+ MeshShardingInterfaceImpl.cpp
NamedOpConversions.cpp
Padding.cpp
Promotion.cpp
@@ -61,12 +63,15 @@ add_mlir_dialect_library(MLIRLinalgTransforms
MLIRIR
MLIRMemRefDialect
MLIRMemRefTransforms
+ MLIRMeshDialect
+ MLIRMeshTransforms
MLIRLinalgDialect
MLIRLinalgUtils
MLIRSCFDialect
MLIRSCFTransforms
MLIRSCFUtils
MLIRPass
+ MLIRShardingInterface
MLIRSubsetOpInterface
MLIRSparseTensorDialect
MLIRTensorDialect
diff --git a/mlir/lib/Dialect/Linalg/Transforms/MeshShardingInterfaceImpl.cpp b/mlir/lib/Dialect/Linalg/Transforms/MeshShardingInterfaceImpl.cpp
new file mode 100644
index 00000000000000..621885974b2ef3
--- /dev/null
+++ b/mlir/lib/Dialect/Linalg/Transforms/MeshShardingInterfaceImpl.cpp
@@ -0,0 +1,336 @@
+//===- MeshShardingInterfaceImpl.cpp --------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "mlir/Dialect/Linalg/Transforms/MeshShardingInterfaceImpl.h"
+
+#include "mlir/Analysis/SliceAnalysis.h"
+#include "mlir/Dialect/Affine/IR/AffineOps.h"
+#include "mlir/Dialect/Arith/IR/Arith.h"
+#include "mlir/Dialect/Linalg/IR/Linalg.h"
+#include "mlir/Dialect/Linalg/IR/LinalgInterfaces.h"
+#include "mlir/Dialect/Mesh/IR/MeshOps.h"
+#include "mlir/Dialect/Mesh/Interfaces/ShardingInterface.h"
+#include "mlir/Dialect/Mesh/Interfaces/ShardingInterfaceImpl.h"
+#include "mlir/Dialect/Mesh/Transforms/Transforms.h"
+#include "mlir/Dialect/SCF/IR/SCF.h"
+#include "mlir/Dialect/Tensor/IR/Tensor.h"
+#include "mlir/Dialect/Utils/StructuredOpsUtils.h"
+#include "mlir/IR/AffineExpr.h"
+#include "mlir/IR/DialectRegistry.h"
+#include "mlir/IR/IRMapping.h"
+#include "mlir/IR/ImplicitLocOpBuilder.h"
+#include "mlir/IR/MLIRContext.h"
+#include "mlir/IR/OpDefinition.h"
+#include "mlir/IR/Operation.h"
+#include "mlir/IR/SymbolTable.h"
+#include "mlir/IR/Value.h"
+#include "mlir/Interfaces/TilingInterface.h"
+#include "mlir/Support/LogicalResult.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/TypeSwitch.h"
+#include <iterator>
+#include <optional>
+#include <utility>
+
+namespace mlir::linalg {
+
+using MeshAxis = mesh::MeshAxis;
+using ReductionKind = mesh::ReductionKind;
+using MeshShardingAttr = mesh::MeshShardingAttr;
+using ShardingArray = mesh::ShardingArray;
+using MeshOp = mesh::MeshOp;
+
+static ReductionKind getReductionKind(Operation *op) {
+ return llvm::TypeSwitch<Operation *, ReductionKind>(op)
+ // Floating-point operations.
+ .Case([](arith::AddFOp op) { return ReductionKind::Sum; })
+ .Case([](arith::MulFOp op) { return ReductionKind::Product; })
+ .Case([](arith::MaximumFOp op) { return ReductionKind::Max; })
+ .Case([](arith::MinimumFOp op) { return ReductionKind::Min; })
+ // Integer operations.
+ .Case([](arith::AddIOp op) { return ReductionKind::Sum; })
+ .Case([](arith::OrIOp op) { return ReductionKind::BitwiseOr; })
+ .Case([](arith::XOrIOp op) { return ReductionKind::BitwiseXor; })
+ .Case([](arith::AndIOp op) { return ReductionKind::Sum; })
+ .Case([](arith::MaxUIOp op) { return ReductionKind::Max; })
+ .Case([](arith::MinUIOp op) { return ReductionKind::Min; })
+ .Case([](arith::MaxSIOp op) { return ReductionKind::Max; })
+ .Case([](arith::MinSIOp op) { return ReductionKind::Min; })
+ .Case([](arith::MulIOp op) { return ReductionKind::Product; })
+ .Default([](Operation *op) { return ReductionKind::Generic; });
+}
+
+static std::optional<Operation *> getReductionOp(LinalgOp op) {
+ SmallVector<Operation *> combinerOps;
+ Value reducedValue = matchReduction(op.getRegionOutputArgs(), 0, combinerOps);
+ if (!reducedValue || combinerOps.size() != 1) {
+ return std::nullopt;
+ }
+
+ return combinerOps[0];
+}
+
+static ReductionKind getReductionKindOfLinalgOp(LinalgOp op) {
+ std::optional<Operation *> reductionOp = getReductionOp(op);
+ if (!reductionOp) {
+ return ReductionKind::Generic;
+ }
+ return getReductionKind(reductionOp.value());
+}
+
+static MeshOp getMesh(Operation *op,
+ ArrayRef<MeshShardingAttr> operandShardings,
+ ArrayRef<MeshShardingAttr> resultShardings,
+ SymbolTableCollection &symbolTable) {
+ for (MeshShardingAttr sharding : operandShardings) {
+ if (sharding) {
+ return mesh::getMesh(op, sharding.getMesh(), symbolTable);
+ }
+ }
+
+ for (MeshShardingAttr sharding : resultShardings) {
+ if (sharding) {
+ return mesh::getMesh(op, sharding.getMesh(), symbolTable);
+ }
+ }
+
+ assert(false);
+}
+
+// Choose the operand based on the current process index along the reduction
+// mesh axes.
+// We need to use the initial value only once to avoid including it in the
+// reduction multiple times.
+// In each process group only the leading process with linear index 0 would use
+// the original operand.
+// The other processes would use the reduction operation neutral tensor.
+static Value createDestinationPassingStyleInitOperand(
+ LinalgOp op, Value spmdizedOperand, ArrayRef<MeshAxis> reductionMeshAxes,
+ MeshOp meshOp, ImplicitLocOpBuilder &builder) {
+ Value processLinearIndexInReductionGroup = mesh::createProcessLinearIndex(
+ meshOp.getSymName(), reductionMeshAxes, builder);
+ Value zero = builder.create<arith::ConstantIndexOp>(0);
+ Value isLeadProcess = builder.create<arith::CmpIOp>(
+ builder.getI1Type(), arith::CmpIPredicate::eq,
+ processLinearIndexInReductionGroup, zero);
+ scf::IfOp ifOp = builder.create<scf::IfOp>(spmdizedOperand.getType(),
+ isLeadProcess, true, true);
+ // Then block.
+ {
+ OpBuilder::InsertionGuard insertionGuard(builder);
+ builder.setInsertionPointToEnd(&ifOp.getThenRegion().front());
+ builder.create<scf::YieldOp>(spmdizedOperand);
+ }
+
+ // Else block.
+ {
+ OpBuilder::InsertionGuard insertionGuard(builder);
+ builder.setInsertionPointToEnd(&ifOp.getElseRegion().front());
+ SmallVector<OpFoldResult> shape =
+ tensor::getMixedSizes(builder, builder.getLoc(), spmdizedOperand);
+ PartialReductionOpInterface partialReductionIface =
+ llvm::cast<PartialReductionOpInterface>(op.getOperation());
+ FailureOr<Operation *> reductionNeutralTensorOp =
+ partialReductionIface.generateInitialTensorForPartialReduction(
+ builder, builder.getLoc(), shape, {});
+ assert(succeeded(reductionNeutralTensorOp));
+ builder.create<scf::YieldOp>(
+ reductionNeutralTensorOp.value()->getResult(0));
+ }
+ return ifOp.getResult(0);
+}
+
+// Create the DPS init operands for the spmdized Linalg op.
+// Return all the new spmdized operands.
+static SmallVector<Value> createDestinationPassingStyleInitOperands(
+ LinalgOp op, MeshOp meshOp, ArrayRef<Value> spmdizedOperands,
+ ArrayRef<MeshAxis> reductionMeshAxes, IRMapping &spmdizationMap,
+ ImplicitLocOpBuilder &builder) {
+ // TODO: add support for multiple destination passing style initial value
+ // operands.
+ // PartialReductionOpInterface::generateInitialTensorForPartialReduction
+ // needs to also support multiple DPS initial operands.
+ SmallVector<Value> newOperands = llvm::to_vector(spmdizedOperands);
+ auto operandIdx = op.getDpsInitOperand(0)->getOperandNumber();
+ Value spmdizedInitOperand =
+ spmdizationMap.lookup(op->getOperands()[operandIdx]);
+ newOperands[operandIdx] = createDestinationPassingStyleInitOperand(
+ op, spmdizedInitOperand, reductionMeshAxes, meshOp, builder);
+ return newOperands;
+}
+
+static void createAllReduceForResultWithoutPartialSharding(
+ Value unshardedLinalgOpResult, ArrayRef<MeshAxis> opReductionMeshAxes,
+ MeshShardingAttr resultSharding, ReductionKind reductionKind,
+ IRMapping &spmdizationMap, ImplicitLocOpBuilder &builder) {
+ SmallVector<MeshAxis> allReduceMeshAxes;
+ llvm::copy_if(opReductionMeshAxes, std::back_inserter(allReduceMeshAxes),
+ [&resultSharding](MeshAxis axis) {
+ return !llvm::is_contained(resultSharding.getPartialAxes(),
+ axis);
+ });
+ if (allReduceMeshAxes.empty()) {
+ return;
+ }
+
+ Value spmdizedLinalgOpResult = spmdizationMap.lookup(unshardedLinalgOpResult);
+ Value reducedValue = builder.create<mesh::AllReduceOp>(
+ spmdizedLinalgOpResult, resultSharding.getMesh().getValue(),
+ allReduceMeshAxes, reductionKind);
+ spmdizationMap.map(unshardedLinalgOpResult, reducedValue);
+}
+
+static void createAllReduceForResultsWithoutPartialShardings(
+ LinalgOp unshardedOp, ArrayRef<MeshAxis> opReductionMeshAxes,
+ ArrayRef<MeshShardingAttr> resultShardings, IRMapping &spmdizationMap,
+ ImplicitLocOpBuilder &builder) {
+ ReductionKind reductionKind = getReductionKindOfLinalgOp(unshardedOp);
+ for (auto [unshardedLinalgOpResult, resultSharding] :
+ llvm::zip(unshardedOp->getResults(), resultShardings)) {
+ createAllReduceForResultWithoutPartialSharding(
+ unshardedLinalgOpResult, opReductionMeshAxes, resultSharding,
+ reductionKind, spmdizationMap, builder);
+ }
+}
+
+static void spmdizeLinalgOpWithShardedReduction(
+ LinalgOp op, ArrayRef<Value> spmdizedOperands,
+ ArrayRef<MeshShardingAttr> operandShardings,
+ ArrayRef<MeshShardingAttr> resultShardings,
+ ArrayRef<utils::IteratorType> loopIteratorTypes,
+ ArrayRef<SmallVector<MeshAxis>> meshAxisAssignmentForLoopIterators,
+ IRMapping &spmdizationMap, SymbolTableCollection &symbolTable,
+ ImplicitLocOpBuilder &builder) {
+ MeshOp mesh = getMesh(op, operandShardings, resultShardings, symbolTable);
+ SmallVector<MeshAxis> reductionMeshAxes = mesh::getReductionMeshAxes(
+ loopIteratorTypes, meshAxisAssignmentForLoopIterators);
+ SmallVector<Value> spmdizedLinalgOpOperands =
+ createDestinationPassingStyleInitOperands(op, mesh, spmdizedOperands,
+ reductionMeshAxes,
+ spmdizationMap, builder);
+ // We must not change the operand mappings of the original spmdizationMap as
+ // they are the mappings for the whole spmdization blob and may be used by
+ // others.
+ IRMapping internalSpmdizationMap;
+ for (auto...
[truncated]
``````````
</details>
https://github.com/llvm/llvm-project/pull/82284
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