| 1 | //===- TestLowerToLLVM.cpp - Test lowering to LLVM as a sink pass ---------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file implements a pass for testing the lowering to LLVM as a generally |
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| 10 | // usable sink pass. |
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| 11 | // |
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| 12 | //===----------------------------------------------------------------------===// |
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| 13 | |
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| 14 | #include "mlir/Conversion/AffineToStandard/AffineToStandard.h" |
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| 15 | #include "mlir/Conversion/FuncToLLVM/ConvertFuncToLLVMPass.h" |
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| 16 | #include "mlir/Conversion/IndexToLLVM/IndexToLLVM.h" |
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| 17 | #include "mlir/Conversion/MathToLLVM/MathToLLVM.h" |
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| 18 | #include "mlir/Conversion/MemRefToLLVM/MemRefToLLVM.h" |
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| 19 | #include "mlir/Conversion/ReconcileUnrealizedCasts/ReconcileUnrealizedCasts.h" |
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| 20 | #include "mlir/Conversion/SCFToControlFlow/SCFToControlFlow.h" |
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| 21 | #include "mlir/Conversion/VectorToLLVM/ConvertVectorToLLVMPass.h" |
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| 22 | #include "mlir/Conversion/VectorToSCF/VectorToSCF.h" |
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| 23 | #include "mlir/Dialect/Func/IR/FuncOps.h" |
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| 24 | #include "mlir/Dialect/LLVMIR/LLVMDialect.h" |
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| 25 | #include "mlir/Dialect/Linalg/Passes.h" |
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| 26 | #include "mlir/Dialect/MemRef/Transforms/Passes.h" |
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| 27 | #include "mlir/IR/DialectRegistry.h" |
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| 28 | #include "mlir/Pass/Pass.h" |
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| 29 | #include "mlir/Pass/PassManager.h" |
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| 30 | #include "mlir/Pass/PassOptions.h" |
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| 31 | #include "mlir/Transforms/Passes.h" |
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| 32 | |
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| 33 | using namespace mlir; |
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| 34 | |
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| 35 | namespace { |
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| 36 | struct TestLowerToLLVMOptions |
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| 37 | : public PassPipelineOptions<TestLowerToLLVMOptions> { |
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| 38 | PassOptions::Option<bool> reassociateFPReductions{ |
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| 39 | *this, "reassociate-fp-reductions" , |
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| 40 | llvm::cl::desc("Allow reassociation og FP reductions" ), |
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| 41 | llvm::cl::init(Val: false)}; |
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| 42 | }; |
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| 43 | |
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| 44 | void buildTestLowerToLLVM(OpPassManager &pm, |
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| 45 | const TestLowerToLLVMOptions &options) { |
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| 46 | |
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| 47 | // TODO: it is feasible to scope lowering at arbitrary level and introduce |
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| 48 | // unrealized casts, but there needs to be the final module-wise cleanup in |
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| 49 | // the end. Keep module-level for now. |
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| 50 | |
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| 51 | // Blanket-convert any remaining high-level vector ops to loops if any remain. |
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| 52 | pm.addNestedPass<func::FuncOp>(createConvertVectorToSCFPass()); |
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| 53 | // Blanket-convert any remaining linalg ops to loops if any remain. |
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| 54 | pm.addNestedPass<func::FuncOp>(createConvertLinalgToLoopsPass()); |
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| 55 | // Blanket-convert any remaining affine ops if any remain. |
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| 56 | pm.addPass(pass: createLowerAffinePass()); |
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| 57 | // Convert SCF to CF (always needed). |
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| 58 | pm.addPass(pass: createConvertSCFToCFPass()); |
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| 59 | // Sprinkle some cleanups. |
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| 60 | pm.addPass(pass: createCanonicalizerPass()); |
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| 61 | pm.addPass(pass: createCSEPass()); |
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| 62 | // Convert vector to LLVM (always needed). |
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| 63 | pm.addPass(createConvertVectorToLLVMPass( |
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| 64 | // TODO: add more options on a per-need basis. |
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| 65 | ConvertVectorToLLVMPassOptions{options.reassociateFPReductions})); |
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| 66 | // Convert Math to LLVM (always needed). |
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| 67 | pm.addNestedPass<func::FuncOp>(createConvertMathToLLVMPass()); |
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| 68 | // Expand complicated MemRef operations before lowering them. |
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| 69 | pm.addPass(memref::pass: createExpandStridedMetadataPass()); |
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| 70 | // The expansion may create affine expressions. Get rid of them. |
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| 71 | pm.addPass(pass: createLowerAffinePass()); |
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| 72 | // Convert MemRef to LLVM (always needed). |
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| 73 | pm.addPass(pass: createFinalizeMemRefToLLVMConversionPass()); |
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| 74 | // Convert Func to LLVM (always needed). |
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| 75 | pm.addPass(pass: createConvertFuncToLLVMPass()); |
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| 76 | // Convert Index to LLVM (always needed). |
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| 77 | pm.addPass(pass: createConvertIndexToLLVMPass()); |
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| 78 | // Convert remaining unrealized_casts (always needed). |
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| 79 | pm.addPass(pass: createReconcileUnrealizedCastsPass()); |
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| 80 | } |
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| 81 | } // namespace |
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| 82 | |
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| 83 | namespace mlir { |
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| 84 | namespace test { |
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| 85 | void registerTestLowerToLLVM() { |
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| 86 | PassPipelineRegistration<TestLowerToLLVMOptions>( |
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| 87 | "test-lower-to-llvm" , |
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| 88 | "An example of pipeline to lower the main dialects (arith, linalg, " |
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| 89 | "memref, scf, vector) down to LLVM." , |
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| 90 | buildTestLowerToLLVM); |
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| 91 | } |
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| 92 | } // namespace test |
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| 93 | } // namespace mlir |
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| 94 | |
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