1 //===- GPUToSPIRVPass.cpp - GPU to SPIR-V Passes --------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file implements a pass to convert a kernel function in the GPU Dialect 10 // into a spv.module operation. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "mlir/Conversion/GPUToSPIRV/GPUToSPIRVPass.h" 15 16 #include "../PassDetail.h" 17 #include "mlir/Conversion/GPUToSPIRV/GPUToSPIRV.h" 18 #include "mlir/Conversion/MemRefToSPIRV/MemRefToSPIRV.h" 19 #include "mlir/Conversion/StandardToSPIRV/StandardToSPIRV.h" 20 #include "mlir/Dialect/GPU/GPUDialect.h" 21 #include "mlir/Dialect/SPIRV/IR/SPIRVDialect.h" 22 #include "mlir/Dialect/SPIRV/IR/SPIRVOps.h" 23 #include "mlir/Dialect/SPIRV/Transforms/SPIRVConversion.h" 24 25 using namespace mlir; 26 27 namespace { 28 /// Pass to lower GPU Dialect to SPIR-V. The pass only converts the gpu.func ops 29 /// inside gpu.module ops. i.e., the function that are referenced in 30 /// gpu.launch_func ops. For each such function 31 /// 32 /// 1) Create a spirv::ModuleOp, and clone the function into spirv::ModuleOp 33 /// (the original function is still needed by the gpu::LaunchKernelOp, so cannot 34 /// replace it). 35 /// 36 /// 2) Lower the body of the spirv::ModuleOp. 37 struct GPUToSPIRVPass : public ConvertGPUToSPIRVBase<GPUToSPIRVPass> { 38 void runOnOperation() override; 39 }; 40 } // namespace 41 42 void GPUToSPIRVPass::runOnOperation() { 43 MLIRContext *context = &getContext(); 44 ModuleOp module = getOperation(); 45 46 SmallVector<Operation *, 1> kernelModules; 47 OpBuilder builder(context); 48 module.walk([&builder, &kernelModules](gpu::GPUModuleOp moduleOp) { 49 // For each kernel module (should be only 1 for now, but that is not a 50 // requirement here), clone the module for conversion because the 51 // gpu.launch function still needs the kernel module. 52 builder.setInsertionPoint(moduleOp.getOperation()); 53 kernelModules.push_back(builder.clone(*moduleOp.getOperation())); 54 }); 55 56 auto targetAttr = spirv::lookupTargetEnvOrDefault(module); 57 std::unique_ptr<ConversionTarget> target = 58 SPIRVConversionTarget::get(targetAttr); 59 60 SPIRVTypeConverter typeConverter(targetAttr); 61 RewritePatternSet patterns(context); 62 populateGPUToSPIRVPatterns(typeConverter, patterns); 63 64 // TODO: Change SPIR-V conversion to be progressive and remove the following 65 // patterns. 66 populateMemRefToSPIRVPatterns(typeConverter, patterns); 67 populateStandardToSPIRVPatterns(typeConverter, patterns); 68 69 if (failed(applyFullConversion(kernelModules, *target, std::move(patterns)))) 70 return signalPassFailure(); 71 } 72 73 std::unique_ptr<OperationPass<ModuleOp>> mlir::createConvertGPUToSPIRVPass() { 74 return std::make_unique<GPUToSPIRVPass>(); 75 } 76