53406427cd
Reland D139447, D139471 With flang actually working - FunctionOpInterface: make get/setFunctionType interface methods This patch removes the concept of a `function_type`-named type attribute as a requirement for implementors of FunctionOpInterface. Instead, this type should be provided through two interface methods, `getFunctionType` and `setFunctionTypeAttr` (*Attr because functions may use different concrete function types), which should be automatically implemented by ODS for ops that define a `$function_type` attribute. This also allows FunctionOpInterface to materialize function types if they don't carry them in an attribute, for example. Importantly, all the function "helper" still accept an attribute name to use in parsing and printing functions, for example. - FunctionOpInterface: arg and result attrs dispatch to interface This patch removes the `arg_attrs` and `res_attrs` named attributes as a requirement for FunctionOpInterface and replaces them with interface methods for the getters, setters, and removers of the relevent attributes. This allows operations to use their own storage for the argument and result attributes. Reviewed By: jpienaar Differential Revision: https://reviews.llvm.org/D139736
453 lines
18 KiB
C++
453 lines
18 KiB
C++
//===- GPUToSPIRV.cpp - GPU to SPIR-V Patterns ----------------------------===//
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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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//
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// This file implements patterns to convert GPU dialect to SPIR-V dialect.
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//
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//===----------------------------------------------------------------------===//
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#include "mlir/Conversion/GPUToSPIRV/GPUToSPIRV.h"
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#include "mlir/Dialect/GPU/IR/GPUDialect.h"
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#include "mlir/Dialect/SPIRV/IR/SPIRVAttributes.h"
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#include "mlir/Dialect/SPIRV/IR/SPIRVDialect.h"
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#include "mlir/Dialect/SPIRV/IR/SPIRVEnums.h"
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#include "mlir/Dialect/SPIRV/IR/SPIRVOps.h"
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#include "mlir/Dialect/SPIRV/IR/TargetAndABI.h"
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#include "mlir/Dialect/SPIRV/Transforms/SPIRVConversion.h"
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#include "mlir/IR/BuiltinOps.h"
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#include "mlir/IR/Matchers.h"
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#include "mlir/Transforms/DialectConversion.h"
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using namespace mlir;
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static constexpr const char kSPIRVModule[] = "__spv__";
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namespace {
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/// Pattern lowering GPU block/thread size/id to loading SPIR-V invocation
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/// builtin variables.
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template <typename SourceOp, spirv::BuiltIn builtin>
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class LaunchConfigConversion : public OpConversionPattern<SourceOp> {
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public:
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using OpConversionPattern<SourceOp>::OpConversionPattern;
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LogicalResult
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matchAndRewrite(SourceOp op, typename SourceOp::Adaptor adaptor,
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ConversionPatternRewriter &rewriter) const override;
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};
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/// Pattern lowering subgroup size/id to loading SPIR-V invocation
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/// builtin variables.
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template <typename SourceOp, spirv::BuiltIn builtin>
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class SingleDimLaunchConfigConversion : public OpConversionPattern<SourceOp> {
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public:
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using OpConversionPattern<SourceOp>::OpConversionPattern;
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LogicalResult
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matchAndRewrite(SourceOp op, typename SourceOp::Adaptor adaptor,
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ConversionPatternRewriter &rewriter) const override;
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};
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/// This is separate because in Vulkan workgroup size is exposed to shaders via
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/// a constant with WorkgroupSize decoration. So here we cannot generate a
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/// builtin variable; instead the information in the `spirv.entry_point_abi`
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/// attribute on the surrounding FuncOp is used to replace the gpu::BlockDimOp.
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class WorkGroupSizeConversion : public OpConversionPattern<gpu::BlockDimOp> {
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public:
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WorkGroupSizeConversion(TypeConverter &typeConverter, MLIRContext *context)
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: OpConversionPattern(typeConverter, context, /*benefit*/ 10) {}
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LogicalResult
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matchAndRewrite(gpu::BlockDimOp op, OpAdaptor adaptor,
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ConversionPatternRewriter &rewriter) const override;
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};
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/// Pattern to convert a kernel function in GPU dialect within a spirv.module.
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class GPUFuncOpConversion final : public OpConversionPattern<gpu::GPUFuncOp> {
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public:
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using OpConversionPattern<gpu::GPUFuncOp>::OpConversionPattern;
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LogicalResult
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matchAndRewrite(gpu::GPUFuncOp funcOp, OpAdaptor adaptor,
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ConversionPatternRewriter &rewriter) const override;
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private:
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SmallVector<int32_t, 3> workGroupSizeAsInt32;
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};
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/// Pattern to convert a gpu.module to a spirv.module.
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class GPUModuleConversion final : public OpConversionPattern<gpu::GPUModuleOp> {
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public:
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using OpConversionPattern<gpu::GPUModuleOp>::OpConversionPattern;
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LogicalResult
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matchAndRewrite(gpu::GPUModuleOp moduleOp, OpAdaptor adaptor,
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ConversionPatternRewriter &rewriter) const override;
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};
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class GPUModuleEndConversion final
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: public OpConversionPattern<gpu::ModuleEndOp> {
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public:
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using OpConversionPattern::OpConversionPattern;
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LogicalResult
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matchAndRewrite(gpu::ModuleEndOp endOp, OpAdaptor adaptor,
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ConversionPatternRewriter &rewriter) const override {
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rewriter.eraseOp(endOp);
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return success();
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}
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};
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/// Pattern to convert a gpu.return into a SPIR-V return.
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// TODO: This can go to DRR when GPU return has operands.
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class GPUReturnOpConversion final : public OpConversionPattern<gpu::ReturnOp> {
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public:
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using OpConversionPattern<gpu::ReturnOp>::OpConversionPattern;
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LogicalResult
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matchAndRewrite(gpu::ReturnOp returnOp, OpAdaptor adaptor,
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ConversionPatternRewriter &rewriter) const override;
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};
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/// Pattern to convert a gpu.barrier op into a spirv.ControlBarrier op.
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class GPUBarrierConversion final : public OpConversionPattern<gpu::BarrierOp> {
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public:
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using OpConversionPattern::OpConversionPattern;
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LogicalResult
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matchAndRewrite(gpu::BarrierOp barrierOp, OpAdaptor adaptor,
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ConversionPatternRewriter &rewriter) const override;
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};
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/// Pattern to convert a gpu.shuffle op into a spirv.GroupNonUniformShuffle op.
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class GPUShuffleConversion final : public OpConversionPattern<gpu::ShuffleOp> {
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public:
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using OpConversionPattern::OpConversionPattern;
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LogicalResult
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matchAndRewrite(gpu::ShuffleOp shuffleOp, OpAdaptor adaptor,
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ConversionPatternRewriter &rewriter) const override;
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};
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} // namespace
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//===----------------------------------------------------------------------===//
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// Builtins.
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//===----------------------------------------------------------------------===//
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template <typename SourceOp, spirv::BuiltIn builtin>
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LogicalResult LaunchConfigConversion<SourceOp, builtin>::matchAndRewrite(
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SourceOp op, typename SourceOp::Adaptor adaptor,
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ConversionPatternRewriter &rewriter) const {
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auto *typeConverter = this->template getTypeConverter<SPIRVTypeConverter>();
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auto indexType = typeConverter->getIndexType();
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// SPIR-V invocation builtin variables are a vector of type <3xi32>
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auto spirvBuiltin =
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spirv::getBuiltinVariableValue(op, builtin, indexType, rewriter);
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rewriter.replaceOpWithNewOp<spirv::CompositeExtractOp>(
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op, indexType, spirvBuiltin,
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rewriter.getI32ArrayAttr({static_cast<int32_t>(op.getDimension())}));
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return success();
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}
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template <typename SourceOp, spirv::BuiltIn builtin>
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LogicalResult
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SingleDimLaunchConfigConversion<SourceOp, builtin>::matchAndRewrite(
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SourceOp op, typename SourceOp::Adaptor adaptor,
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ConversionPatternRewriter &rewriter) const {
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auto *typeConverter = this->template getTypeConverter<SPIRVTypeConverter>();
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auto indexType = typeConverter->getIndexType();
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auto spirvBuiltin =
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spirv::getBuiltinVariableValue(op, builtin, indexType, rewriter);
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rewriter.replaceOp(op, spirvBuiltin);
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return success();
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}
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LogicalResult WorkGroupSizeConversion::matchAndRewrite(
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gpu::BlockDimOp op, OpAdaptor adaptor,
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ConversionPatternRewriter &rewriter) const {
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DenseI32ArrayAttr workGroupSizeAttr = spirv::lookupLocalWorkGroupSize(op);
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if (!workGroupSizeAttr)
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return failure();
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int val =
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workGroupSizeAttr.asArrayRef()[static_cast<int32_t>(op.getDimension())];
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auto convertedType =
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getTypeConverter()->convertType(op.getResult().getType());
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if (!convertedType)
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return failure();
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rewriter.replaceOpWithNewOp<spirv::ConstantOp>(
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op, convertedType, IntegerAttr::get(convertedType, val));
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return success();
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}
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//===----------------------------------------------------------------------===//
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// GPUFuncOp
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//===----------------------------------------------------------------------===//
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// Legalizes a GPU function as an entry SPIR-V function.
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static spirv::FuncOp
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lowerAsEntryFunction(gpu::GPUFuncOp funcOp, TypeConverter &typeConverter,
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ConversionPatternRewriter &rewriter,
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spirv::EntryPointABIAttr entryPointInfo,
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ArrayRef<spirv::InterfaceVarABIAttr> argABIInfo) {
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auto fnType = funcOp.getFunctionType();
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if (fnType.getNumResults()) {
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funcOp.emitError("SPIR-V lowering only supports entry functions"
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"with no return values right now");
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return nullptr;
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}
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if (!argABIInfo.empty() && fnType.getNumInputs() != argABIInfo.size()) {
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funcOp.emitError(
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"lowering as entry functions requires ABI info for all arguments "
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"or none of them");
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return nullptr;
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}
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// Update the signature to valid SPIR-V types and add the ABI
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// attributes. These will be "materialized" by using the
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// LowerABIAttributesPass.
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TypeConverter::SignatureConversion signatureConverter(fnType.getNumInputs());
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{
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for (const auto &argType :
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enumerate(funcOp.getFunctionType().getInputs())) {
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auto convertedType = typeConverter.convertType(argType.value());
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if (!convertedType)
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return nullptr;
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signatureConverter.addInputs(argType.index(), convertedType);
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}
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}
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auto newFuncOp = rewriter.create<spirv::FuncOp>(
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funcOp.getLoc(), funcOp.getName(),
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rewriter.getFunctionType(signatureConverter.getConvertedTypes(),
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std::nullopt));
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for (const auto &namedAttr : funcOp->getAttrs()) {
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if (namedAttr.getName() == funcOp.getFunctionTypeAttrName() ||
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namedAttr.getName() == SymbolTable::getSymbolAttrName())
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continue;
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newFuncOp->setAttr(namedAttr.getName(), namedAttr.getValue());
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}
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rewriter.inlineRegionBefore(funcOp.getBody(), newFuncOp.getBody(),
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newFuncOp.end());
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if (failed(rewriter.convertRegionTypes(&newFuncOp.getBody(), typeConverter,
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&signatureConverter)))
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return nullptr;
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rewriter.eraseOp(funcOp);
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// Set the attributes for argument and the function.
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StringRef argABIAttrName = spirv::getInterfaceVarABIAttrName();
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for (auto argIndex : llvm::seq<unsigned>(0, argABIInfo.size())) {
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newFuncOp.setArgAttr(argIndex, argABIAttrName, argABIInfo[argIndex]);
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}
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newFuncOp->setAttr(spirv::getEntryPointABIAttrName(), entryPointInfo);
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return newFuncOp;
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}
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/// Populates `argABI` with spirv.interface_var_abi attributes for lowering
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/// gpu.func to spirv.func if no arguments have the attributes set
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/// already. Returns failure if any argument has the ABI attribute set already.
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static LogicalResult
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getDefaultABIAttrs(MLIRContext *context, gpu::GPUFuncOp funcOp,
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SmallVectorImpl<spirv::InterfaceVarABIAttr> &argABI) {
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spirv::TargetEnvAttr targetEnv = spirv::lookupTargetEnvOrDefault(funcOp);
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if (!spirv::needsInterfaceVarABIAttrs(targetEnv))
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return success();
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for (auto argIndex : llvm::seq<unsigned>(0, funcOp.getNumArguments())) {
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if (funcOp.getArgAttrOfType<spirv::InterfaceVarABIAttr>(
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argIndex, spirv::getInterfaceVarABIAttrName()))
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return failure();
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// Vulkan's interface variable requirements needs scalars to be wrapped in a
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// struct. The struct held in storage buffer.
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Optional<spirv::StorageClass> sc;
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if (funcOp.getArgument(argIndex).getType().isIntOrIndexOrFloat())
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sc = spirv::StorageClass::StorageBuffer;
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argABI.push_back(spirv::getInterfaceVarABIAttr(0, argIndex, sc, context));
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}
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return success();
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}
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LogicalResult GPUFuncOpConversion::matchAndRewrite(
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gpu::GPUFuncOp funcOp, OpAdaptor adaptor,
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ConversionPatternRewriter &rewriter) const {
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if (!gpu::GPUDialect::isKernel(funcOp))
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return failure();
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SmallVector<spirv::InterfaceVarABIAttr, 4> argABI;
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if (failed(getDefaultABIAttrs(rewriter.getContext(), funcOp, argABI))) {
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argABI.clear();
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for (auto argIndex : llvm::seq<unsigned>(0, funcOp.getNumArguments())) {
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// If the ABI is already specified, use it.
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auto abiAttr = funcOp.getArgAttrOfType<spirv::InterfaceVarABIAttr>(
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argIndex, spirv::getInterfaceVarABIAttrName());
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if (!abiAttr) {
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funcOp.emitRemark(
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"match failure: missing 'spirv.interface_var_abi' attribute at "
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"argument ")
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<< argIndex;
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return failure();
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}
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argABI.push_back(abiAttr);
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}
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}
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auto entryPointAttr = spirv::lookupEntryPointABI(funcOp);
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if (!entryPointAttr) {
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funcOp.emitRemark(
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"match failure: missing 'spirv.entry_point_abi' attribute");
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return failure();
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}
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spirv::FuncOp newFuncOp = lowerAsEntryFunction(
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funcOp, *getTypeConverter(), rewriter, entryPointAttr, argABI);
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if (!newFuncOp)
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return failure();
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newFuncOp->removeAttr(
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rewriter.getStringAttr(gpu::GPUDialect::getKernelFuncAttrName()));
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return success();
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}
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//===----------------------------------------------------------------------===//
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// ModuleOp with gpu.module.
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//===----------------------------------------------------------------------===//
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LogicalResult GPUModuleConversion::matchAndRewrite(
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gpu::GPUModuleOp moduleOp, OpAdaptor adaptor,
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ConversionPatternRewriter &rewriter) const {
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spirv::TargetEnvAttr targetEnv = spirv::lookupTargetEnvOrDefault(moduleOp);
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spirv::AddressingModel addressingModel = spirv::getAddressingModel(targetEnv);
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FailureOr<spirv::MemoryModel> memoryModel = spirv::getMemoryModel(targetEnv);
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if (failed(memoryModel))
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return moduleOp.emitRemark("match failure: could not selected memory model "
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"based on 'spirv.target_env'");
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// Add a keyword to the module name to avoid symbolic conflict.
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std::string spvModuleName = (kSPIRVModule + moduleOp.getName()).str();
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auto spvModule = rewriter.create<spirv::ModuleOp>(
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moduleOp.getLoc(), addressingModel, *memoryModel, std::nullopt,
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StringRef(spvModuleName));
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// Move the region from the module op into the SPIR-V module.
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Region &spvModuleRegion = spvModule.getRegion();
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rewriter.inlineRegionBefore(moduleOp.getBodyRegion(), spvModuleRegion,
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spvModuleRegion.begin());
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// The spirv.module build method adds a block. Remove that.
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rewriter.eraseBlock(&spvModuleRegion.back());
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// Some of the patterns call `lookupTargetEnv` during conversion and they
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// will fail if called after GPUModuleConversion and we don't preserve
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// `TargetEnv` attribute.
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// Copy TargetEnvAttr only if it is attached directly to the GPUModuleOp.
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if (auto attr = moduleOp->getAttrOfType<spirv::TargetEnvAttr>(
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spirv::getTargetEnvAttrName()))
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spvModule->setAttr(spirv::getTargetEnvAttrName(), attr);
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rewriter.eraseOp(moduleOp);
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return success();
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}
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//===----------------------------------------------------------------------===//
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// GPU return inside kernel functions to SPIR-V return.
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//===----------------------------------------------------------------------===//
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LogicalResult GPUReturnOpConversion::matchAndRewrite(
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gpu::ReturnOp returnOp, OpAdaptor adaptor,
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ConversionPatternRewriter &rewriter) const {
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if (!adaptor.getOperands().empty())
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return failure();
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rewriter.replaceOpWithNewOp<spirv::ReturnOp>(returnOp);
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return success();
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}
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//===----------------------------------------------------------------------===//
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// Barrier.
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//===----------------------------------------------------------------------===//
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LogicalResult GPUBarrierConversion::matchAndRewrite(
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gpu::BarrierOp barrierOp, OpAdaptor adaptor,
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ConversionPatternRewriter &rewriter) const {
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MLIRContext *context = getContext();
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// Both execution and memory scope should be workgroup.
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auto scope = spirv::ScopeAttr::get(context, spirv::Scope::Workgroup);
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// Require acquire and release memory semantics for workgroup memory.
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auto memorySemantics = spirv::MemorySemanticsAttr::get(
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context, spirv::MemorySemantics::WorkgroupMemory |
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spirv::MemorySemantics::AcquireRelease);
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rewriter.replaceOpWithNewOp<spirv::ControlBarrierOp>(barrierOp, scope, scope,
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memorySemantics);
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return success();
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}
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//===----------------------------------------------------------------------===//
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// Shuffle
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//===----------------------------------------------------------------------===//
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LogicalResult GPUShuffleConversion::matchAndRewrite(
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gpu::ShuffleOp shuffleOp, OpAdaptor adaptor,
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ConversionPatternRewriter &rewriter) const {
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// Require the shuffle width to be the same as the target's subgroup size,
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// given that for SPIR-V non-uniform subgroup ops, we cannot select
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// participating invocations.
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auto targetEnv = getTypeConverter<SPIRVTypeConverter>()->getTargetEnv();
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unsigned subgroupSize =
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targetEnv.getAttr().getResourceLimits().getSubgroupSize();
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IntegerAttr widthAttr;
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if (!matchPattern(shuffleOp.getWidth(), m_Constant(&widthAttr)) ||
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widthAttr.getValue().getZExtValue() != subgroupSize)
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return rewriter.notifyMatchFailure(
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shuffleOp, "shuffle width and target subgroup size mismatch");
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Location loc = shuffleOp.getLoc();
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Value trueVal = spirv::ConstantOp::getOne(rewriter.getI1Type(),
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shuffleOp.getLoc(), rewriter);
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auto scope = rewriter.getAttr<spirv::ScopeAttr>(spirv::Scope::Subgroup);
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Value result;
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switch (shuffleOp.getMode()) {
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case gpu::ShuffleMode::XOR:
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result = rewriter.create<spirv::GroupNonUniformShuffleXorOp>(
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loc, scope, adaptor.getValue(), adaptor.getOffset());
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break;
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case gpu::ShuffleMode::IDX:
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result = rewriter.create<spirv::GroupNonUniformShuffleOp>(
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loc, scope, adaptor.getValue(), adaptor.getOffset());
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break;
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default:
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return rewriter.notifyMatchFailure(shuffleOp, "unimplemented shuffle mode");
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}
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rewriter.replaceOp(shuffleOp, {result, trueVal});
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return success();
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}
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//===----------------------------------------------------------------------===//
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// GPU To SPIRV Patterns.
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//===----------------------------------------------------------------------===//
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void mlir::populateGPUToSPIRVPatterns(SPIRVTypeConverter &typeConverter,
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RewritePatternSet &patterns) {
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patterns.add<
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GPUBarrierConversion, GPUFuncOpConversion, GPUModuleConversion,
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GPUModuleEndConversion, GPUReturnOpConversion, GPUShuffleConversion,
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LaunchConfigConversion<gpu::BlockIdOp, spirv::BuiltIn::WorkgroupId>,
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LaunchConfigConversion<gpu::GridDimOp, spirv::BuiltIn::NumWorkgroups>,
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LaunchConfigConversion<gpu::BlockDimOp, spirv::BuiltIn::WorkgroupSize>,
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LaunchConfigConversion<gpu::ThreadIdOp,
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spirv::BuiltIn::LocalInvocationId>,
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LaunchConfigConversion<gpu::GlobalIdOp,
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spirv::BuiltIn::GlobalInvocationId>,
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SingleDimLaunchConfigConversion<gpu::SubgroupIdOp,
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spirv::BuiltIn::SubgroupId>,
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SingleDimLaunchConfigConversion<gpu::NumSubgroupsOp,
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spirv::BuiltIn::NumSubgroups>,
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SingleDimLaunchConfigConversion<gpu::SubgroupSizeOp,
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spirv::BuiltIn::SubgroupSize>,
|
|
WorkGroupSizeConversion>(typeConverter, patterns.getContext());
|
|
}
|