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[mlir][GPU] Implement ValueBoundsOpInterface for GPU ID operations (llvm#122190)
The GPU ID operations already implement InferIntRangeInterface, which gives constant lower and upper bounds on those IDs when appropriate metadata is prentent on the operations or in the surrounding context. This commit uses that existing code to implement the ValueBoundsOpInterface, which is used when analyzing affine operations (unlike the integer range interface, which is used for arithmetic optimization). It also implements the interface for gpu.launch, where we can use it to express the constraint that block/grid sizes are equal to their value from outside the launch op and that the corresponding IDs are bounded above by that size. As a consequence, the test pass for this inference is updated to work on a FunctionOpInterface and not a func.func, creating minor churn in other tests.
1 parent 1b897f7 commit 0aa831e

16 files changed

+317
-15
lines changed

‎mlir/include/mlir/Dialect/GPU/IR/ValueBoundsOpInterfaceImpl.h

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//===- ValueBoundsOpInterfaceImpl.h - Impl. of ValueBoundsOpInterface -----===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef MLIR_DIALECT_GPU_IR_VALUEBOUNDSOPINTERFACEIMPL_H
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#define MLIR_DIALECT_GPU_IR_VALUEBOUNDSOPINTERFACEIMPL_H
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namespace mlir {
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class DialectRegistry;
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namespace gpu {
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void registerValueBoundsOpInterfaceExternalModels(DialectRegistry &registry);
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} // namespace gpu
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} // namespace mlir
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#endif // MLIR_DIALECT_GPU_IR_VALUEBOUNDSOPINTERFACEIMPL_H

‎mlir/include/mlir/InitAllDialects.h

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@@ -37,6 +37,7 @@
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#include "mlir/Dialect/EmitC/IR/EmitC.h"
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#include "mlir/Dialect/Func/IR/FuncOps.h"
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#include "mlir/Dialect/GPU/IR/GPUDialect.h"
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#include "mlir/Dialect/GPU/IR/ValueBoundsOpInterfaceImpl.h"
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#include "mlir/Dialect/GPU/Transforms/BufferDeallocationOpInterfaceImpl.h"
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#include "mlir/Dialect/IRDL/IR/IRDL.h"
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#include "mlir/Dialect/Index/IR/IndexDialect.h"
@@ -164,6 +165,7 @@ inline void registerAllDialects(DialectRegistry &registry) {
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cf::registerBufferizableOpInterfaceExternalModels(registry);
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cf::registerBufferDeallocationOpInterfaceExternalModels(registry);
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gpu::registerBufferDeallocationOpInterfaceExternalModels(registry);
168+
gpu::registerValueBoundsOpInterfaceExternalModels(registry);
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LLVM::registerInlinerInterface(registry);
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linalg::registerAllDialectInterfaceImplementations(registry);
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linalg::registerRuntimeVerifiableOpInterfaceExternalModels(registry);

‎mlir/lib/Dialect/GPU/CMakeLists.txt

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@@ -1,6 +1,7 @@
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add_mlir_dialect_library(MLIRGPUDialect
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IR/GPUDialect.cpp
33
IR/InferIntRangeInterfaceImpls.cpp
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IR/ValueBoundsOpInterfaceImpl.cpp
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56
ADDITIONAL_HEADER_DIRS
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${MLIR_MAIN_INCLUDE_DIR}/mlir/Dialect/GPU
@@ -40,7 +41,7 @@ add_mlir_dialect_library(MLIRGPUTransforms
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Transforms/ShuffleRewriter.cpp
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Transforms/SPIRVAttachTarget.cpp
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Transforms/SubgroupReduceLowering.cpp
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OBJECT
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ADDITIONAL_HEADER_DIRS

‎mlir/lib/Dialect/GPU/IR/GPUDialect.cpp

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#include "mlir/IR/TypeUtilities.h"
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#include "mlir/Interfaces/FunctionImplementation.h"
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#include "mlir/Interfaces/SideEffectInterfaces.h"
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#include "mlir/Interfaces/ValueBoundsOpInterface.h"
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#include "mlir/Transforms/InliningUtils.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/TypeSwitch.h"
@@ -217,6 +218,10 @@ void GPUDialect::initialize() {
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addInterfaces<GPUInlinerInterface>();
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declarePromisedInterface<bufferization::BufferDeallocationOpInterface,
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TerminatorOp>();
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declarePromisedInterfaces<
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ValueBoundsOpInterface, ClusterDimOp, ClusterDimBlocksOp, ClusterIdOp,
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ClusterBlockIdOp, BlockDimOp, BlockIdOp, GridDimOp, ThreadIdOp, LaneIdOp,
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SubgroupIdOp, GlobalIdOp, NumSubgroupsOp, SubgroupSizeOp, LaunchOp>();
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}
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static std::string getSparseHandleKeyword(SparseHandleKind kind) {

‎mlir/lib/Dialect/GPU/IR/ValueBoundsOpInterfaceImpl.cpp

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//===- ValueBoundsOpInterfaceImpl.cpp - Impl. of ValueBoundsOpInterface ---===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "mlir/Dialect/GPU/IR/ValueBoundsOpInterfaceImpl.h"
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#include "mlir/Dialect/GPU/IR/GPUDialect.h"
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#include "mlir/Interfaces/InferIntRangeInterface.h"
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#include "mlir/Interfaces/ValueBoundsOpInterface.h"
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using namespace mlir;
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using namespace mlir::gpu;
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namespace {
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/// Implement ValueBoundsOpInterface (which only works on index-typed values,
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/// gathers a set of constraint expressions, and is used for affine analyses)
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/// in terms of InferIntRangeInterface (which works
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/// on arbitrary integer types, creates [min, max] ranges, and is used in for
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/// arithmetic simplification).
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template <typename Op>
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struct GpuIdOpInterface
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: public ValueBoundsOpInterface::ExternalModel<GpuIdOpInterface<Op>, Op> {
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void populateBoundsForIndexValue(Operation *op, Value value,
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ValueBoundsConstraintSet &cstr) const {
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auto inferrable = cast<InferIntRangeInterface>(op);
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assert(value == op->getResult(0) &&
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"inferring for value that isn't the GPU op's result");
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auto translateConstraint = [&](Value v, const ConstantIntRanges &range) {
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assert(v == value &&
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"GPU ID op inferring values for something that's not its result");
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cstr.bound(v) >= range.smin().getSExtValue();
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cstr.bound(v) <= range.smax().getSExtValue();
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};
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assert(inferrable->getNumOperands() == 0 && "ID ops have no operands");
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inferrable.inferResultRanges({}, translateConstraint);
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}
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};
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struct GpuLaunchOpInterface
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: public ValueBoundsOpInterface::ExternalModel<GpuLaunchOpInterface,
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LaunchOp> {
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void populateBoundsForIndexValue(Operation *op, Value value,
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ValueBoundsConstraintSet &cstr) const {
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auto launchOp = cast<LaunchOp>(op);
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Value sizeArg = nullptr;
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bool isSize = false;
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KernelDim3 gridSizeArgs = launchOp.getGridSizeOperandValues();
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KernelDim3 blockSizeArgs = launchOp.getBlockSizeOperandValues();
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auto match = [&](KernelDim3 bodyArgs, KernelDim3 externalArgs,
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bool areSizeArgs) {
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if (value == bodyArgs.x) {
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sizeArg = externalArgs.x;
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isSize = areSizeArgs;
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}
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if (value == bodyArgs.y) {
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sizeArg = externalArgs.y;
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isSize = areSizeArgs;
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}
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if (value == bodyArgs.z) {
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sizeArg = externalArgs.z;
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isSize = areSizeArgs;
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}
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};
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match(launchOp.getThreadIds(), blockSizeArgs, false);
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match(launchOp.getBlockSize(), blockSizeArgs, true);
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match(launchOp.getBlockIds(), gridSizeArgs, false);
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match(launchOp.getGridSize(), gridSizeArgs, true);
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if (launchOp.hasClusterSize()) {
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KernelDim3 clusterSizeArgs = *launchOp.getClusterSizeOperandValues();
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match(*launchOp.getClusterIds(), clusterSizeArgs, false);
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match(*launchOp.getClusterSize(), clusterSizeArgs, true);
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}
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if (!sizeArg)
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return;
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if (isSize) {
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cstr.bound(value) == cstr.getExpr(sizeArg);
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cstr.bound(value) >= 1;
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} else {
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cstr.bound(value) < cstr.getExpr(sizeArg);
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cstr.bound(value) >= 0;
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}
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}
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};
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} // namespace
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void mlir::gpu::registerValueBoundsOpInterfaceExternalModels(
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DialectRegistry &registry) {
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registry.addExtension(+[](MLIRContext *ctx, GPUDialect *dialect) {
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#define REGISTER(X) X::attachInterface<GpuIdOpInterface<X>>(*ctx);
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REGISTER(ClusterDimOp)
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REGISTER(ClusterDimBlocksOp)
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REGISTER(ClusterIdOp)
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REGISTER(ClusterBlockIdOp)
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REGISTER(BlockDimOp)
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REGISTER(BlockIdOp)
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REGISTER(GridDimOp)
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REGISTER(ThreadIdOp)
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REGISTER(LaneIdOp)
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REGISTER(SubgroupIdOp)
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REGISTER(GlobalIdOp)
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REGISTER(NumSubgroupsOp)
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REGISTER(SubgroupSizeOp)
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#undef REGISTER
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LaunchOp::attachInterface<GpuLaunchOpInterface>(*ctx);
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});
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}

‎mlir/test/Dialect/Affine/value-bounds-op-interface-impl.mlir

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// RUN: mlir-opt %s -test-affine-reify-value-bounds -verify-diagnostics \
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// RUN: mlir-opt %s -pass-pipeline='builtin.module(func.func(test-affine-reify-value-bounds))' -verify-diagnostics \
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// RUN: -split-input-file | FileCheck %s
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// CHECK: #[[$map:.*]] = affine_map<()[s0, s1] -> (s0 + s1)>

‎mlir/test/Dialect/Affine/value-bounds-reification.mlir

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// RUN: mlir-opt %s -test-affine-reify-value-bounds="reify-to-func-args" \
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// RUN: mlir-opt %s -pass-pipeline='builtin.module(func.func(test-affine-reify-value-bounds{reify-to-func-args}))' \
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// RUN: -verify-diagnostics -split-input-file | FileCheck %s
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// RUN: mlir-opt %s -test-affine-reify-value-bounds="reify-to-func-args use-arith-ops" \
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// RUN: mlir-opt %s -pass-pipeline='builtin.module(func.func(test-affine-reify-value-bounds{reify-to-func-args use-arith-ops}))' \
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// RUN: -verify-diagnostics -split-input-file | FileCheck %s --check-prefix=CHECK-ARITH
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// CHECK-LABEL: func @reify_through_chain(

‎mlir/test/Dialect/Arith/value-bounds-op-interface-impl.mlir

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// RUN: mlir-opt %s -test-affine-reify-value-bounds -verify-diagnostics \
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// RUN: mlir-opt %s -pass-pipeline='builtin.module(func.func(test-affine-reify-value-bounds))' -verify-diagnostics \
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// RUN: -verify-diagnostics -split-input-file | FileCheck %s
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// RUN: mlir-opt %s -test-affine-reify-value-bounds="use-arith-ops" \
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// RUN: mlir-opt %s -pass-pipeline='builtin.module(func.func(test-affine-reify-value-bounds{use-arith-ops}))' \
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// RUN: -verify-diagnostics -split-input-file | \
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// RUN: FileCheck %s --check-prefix=CHECK-ARITH
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‎mlir/test/Dialect/GPU/value-bounds-op-interface-impl.mlir

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// RUN: mlir-opt %s -pass-pipeline='builtin.module( \
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// RUN: func.func(test-affine-reify-value-bounds), \
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// RUN: gpu.module(llvm.func(test-affine-reify-value-bounds)), \
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// RUN: gpu.module(gpu.func(test-affine-reify-value-bounds)))' \
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// RUN: -verify-diagnostics \
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// RUN: -split-input-file | FileCheck %s
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// CHECK-LABEL: func @launch_func
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func.func @launch_func(%arg0 : index) {
10+
%c0 = arith.constant 0 : index
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%c1 = arith.constant 1 : index
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%c2 = arith.constant 2 : index
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%c4 = arith.constant 4 : index
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%c64 = arith.constant 64 : index
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gpu.launch blocks(%block_id_x, %block_id_y, %block_id_z) in (%grid_dim_x = %arg0, %grid_dim_y = %c4, %grid_dim_z = %c2)
16+
threads(%thread_id_x, %thread_id_y, %thread_id_z) in (%block_dim_x = %c64, %block_dim_y = %c4, %block_dim_z = %c2) {
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// Sanity checks:
19+
// expected-error @below{{unknown}}
20+
"test.compare" (%thread_id_x, %c1) {cmp = "EQ"} : (index, index) -> ()
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// expected-remark @below{{false}}
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"test.compare" (%thread_id_x, %c64) {cmp = "GE"} : (index, index) -> ()
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// expected-remark @below{{true}}
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"test.compare" (%grid_dim_x, %c1) {cmp = "GE"} : (index, index) -> ()
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// expected-remark @below{{true}}
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"test.compare" (%grid_dim_x, %arg0) {cmp = "EQ"} : (index, index) -> ()
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// expected-remark @below{{true}}
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"test.compare" (%grid_dim_y, %c4) {cmp = "EQ"} : (index, index) -> ()
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// expected-remark @below{{true}}
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"test.compare" (%grid_dim_z, %c2) {cmp = "EQ"} : (index, index) -> ()
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// expected-remark @below{{true}}
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"test.compare"(%block_id_x, %c0) {cmp = "GE"} : (index, index) -> ()
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// expected-remark @below{{true}}
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"test.compare"(%block_id_x, %arg0) {cmp = "LT"} : (index, index) -> ()
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// expected-remark @below{{true}}
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"test.compare"(%block_id_y, %c0) {cmp = "GE"} : (index, index) -> ()
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// expected-remark @below{{true}}
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"test.compare"(%block_id_y, %c4) {cmp = "LT"} : (index, index) -> ()
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// expected-remark @below{{true}}
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"test.compare"(%block_id_z, %c0) {cmp = "GE"} : (index, index) -> ()
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// expected-remark @below{{true}}
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"test.compare"(%block_id_z, %c2) {cmp = "LT"} : (index, index) -> ()
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// expected-remark @below{{true}}
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"test.compare" (%block_dim_x, %c64) {cmp = "EQ"} : (index, index) -> ()
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// expected-remark @below{{true}}
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"test.compare" (%block_dim_y, %c4) {cmp = "EQ"} : (index, index) -> ()
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// expected-remark @below{{true}}
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"test.compare" (%block_dim_z, %c2) {cmp = "EQ"} : (index, index) -> ()
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// expected-remark @below{{true}}
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"test.compare"(%thread_id_x, %c0) {cmp = "GE"} : (index, index) -> ()
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// expected-remark @below{{true}}
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"test.compare"(%thread_id_x, %c64) {cmp = "LT"} : (index, index) -> ()
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// expected-remark @below{{true}}
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"test.compare"(%thread_id_y, %c0) {cmp = "GE"} : (index, index) -> ()
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// expected-remark @below{{true}}
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"test.compare"(%thread_id_y, %c4) {cmp = "LT"} : (index, index) -> ()
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// expected-remark @below{{true}}
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"test.compare"(%thread_id_z, %c0) {cmp = "GE"} : (index, index) -> ()
63+
// expected-remark @below{{true}}
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"test.compare"(%thread_id_z, %c2) {cmp = "LT"} : (index, index) -> ()
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66+
// expected-remark @below{{true}}
67+
"test.compare"(%thread_id_x, %block_dim_x) {cmp = "LT"} : (index, index) -> ()
68+
gpu.terminator
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}
70+
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func.return
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}
73+
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// -----
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// The tests for what the ranges are are located in int-range-interface.mlir,
77+
// so here we just make sure that the results of that interface propagate into
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// constraints.
79+
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// CHECK-LABEL: func @kernel
81+
module attributes {gpu.container_module} {
82+
gpu.module @gpu_module {
83+
llvm.func @kernel() attributes {gpu.kernel} {
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%c0 = arith.constant 0 : index
86+
%ctid_max = arith.constant 4294967295 : index
87+
%thread_id_x = gpu.thread_id x
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// expected-remark @below{{true}}
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"test.compare" (%thread_id_x, %c0) {cmp = "GE"} : (index, index) -> ()
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// expected-remark @below{{true}}
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"test.compare" (%thread_id_x, %ctid_max) {cmp = "LT"} : (index, index) -> ()
93+
llvm.return
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}
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}
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}
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// -----
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// CHECK-LABEL: func @annotated_kernel
101+
module attributes {gpu.container_module} {
102+
gpu.module @gpu_module {
103+
gpu.func @annotated_kernel() kernel
104+
attributes {known_block_size = array<i32: 8, 12, 16>,
105+
known_grid_size = array<i32: 20, 24, 28>} {
106+
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%c0 = arith.constant 0 : index
108+
%c8 = arith.constant 8 : index
109+
%thread_id_x = gpu.thread_id x
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// expected-remark @below{{true}}
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"test.compare"(%thread_id_x, %c0) {cmp = "GE"} : (index, index) -> ()
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// expected-remark @below{{true}}
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"test.compare"(%thread_id_x, %c8) {cmp = "LT"} : (index, index) -> ()
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116+
%block_dim_x = gpu.block_dim x
117+
// expected-remark @below{{true}}
118+
"test.compare"(%block_dim_x, %c8) {cmp = "EQ"} : (index, index) -> ()
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// expected-remark @below{{true}}
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"test.compare"(%thread_id_x, %block_dim_x) {cmp = "LT"} : (index, index) -> ()
122+
gpu.return
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}
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}
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}
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// -----
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// CHECK-LABEL: func @local_bounds_kernel
130+
module attributes {gpu.container_module} {
131+
gpu.module @gpu_module {
132+
gpu.func @local_bounds_kernel() kernel {
133+
134+
%c0 = arith.constant 0 : index
135+
%c1 = arith.constant 1 : index
136+
%c8 = arith.constant 8 : index
137+
138+
%block_dim_x = gpu.block_dim x upper_bound 8
139+
// expected-remark @below{{true}}
140+
"test.compare"(%block_dim_x, %c1) {cmp = "GE"} : (index, index) -> ()
141+
// expected-remark @below{{true}}
142+
"test.compare"(%block_dim_x, %c8) {cmp = "LE"} : (index, index) -> ()
143+
// expected-error @below{{unknown}}
144+
"test.compare"(%block_dim_x, %c8) {cmp = "EQ"} : (index, index) -> ()
145+
146+
%thread_id_x = gpu.thread_id x upper_bound 8
147+
// expected-remark @below{{true}}
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"test.compare"(%thread_id_x, %c0) {cmp = "GE"} : (index, index) -> ()
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// expected-remark @below{{true}}
150+
"test.compare"(%thread_id_x, %c8) {cmp = "LT"} : (index, index) -> ()
151+
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// Note: there isn't a way to express the ID <= size constraint
153+
// in this form
154+
// expected-error @below{{unknown}}
155+
"test.compare"(%thread_id_x, %block_dim_x) {cmp = "LT"} : (index, index) -> ()
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gpu.return
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}
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}
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}

‎mlir/test/Dialect/Linalg/value-bounds-op-interface-impl.mlir

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// RUN: mlir-opt %s -test-affine-reify-value-bounds -verify-diagnostics \
1+
// RUN: mlir-opt %s -pass-pipeline='builtin.module(func.func(test-affine-reify-value-bounds))' -verify-diagnostics \
22
// RUN: -split-input-file | FileCheck %s
33

44
// CHECK-LABEL: func @linalg_fill(

‎mlir/test/Dialect/MemRef/value-bounds-op-interface-impl.mlir

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// RUN: mlir-opt %s -test-affine-reify-value-bounds -verify-diagnostics \
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// RUN: mlir-opt %s -pass-pipeline='builtin.module(func.func(test-affine-reify-value-bounds))' -verify-diagnostics \
22
// RUN: -split-input-file | FileCheck %s
33

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// CHECK-LABEL: func @memref_alloc(

‎mlir/test/Dialect/SCF/value-bounds-op-interface-impl.mlir

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1-
// RUN: mlir-opt %s -test-affine-reify-value-bounds="reify-to-func-args" \
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// RUN: mlir-opt %s -pass-pipeline='builtin.module(func.func(test-affine-reify-value-bounds{reify-to-func-args}))' \
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// RUN: -verify-diagnostics -split-input-file | FileCheck %s
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// CHECK-LABEL: func @scf_for(

‎mlir/test/Dialect/Tensor/value-bounds-op-interface-impl.mlir

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@@ -1,4 +1,4 @@
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// RUN: mlir-opt %s -test-affine-reify-value-bounds -verify-diagnostics \
1+
// RUN: mlir-opt %s -pass-pipeline='builtin.module(func.func(test-affine-reify-value-bounds))' -verify-diagnostics \
22
// RUN: -split-input-file | FileCheck %s
33

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func.func @unknown_op() -> index {

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