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| Rev | Author | Line No. | Line |
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| 14 | pmbaty | 1 | //===- Utils.h - Utility functions for code generation ----------*- C++ -*-===// |
| 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 contains utility functions for the code generation. |
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| 10 | //===----------------------------------------------------------------------===// |
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| 11 | |||
| 12 | #ifndef POLLY_CODEGEN_UTILS_H |
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| 13 | #define POLLY_CODEGEN_UTILS_H |
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| 14 | |||
| 15 | #include <utility> |
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| 16 | |||
| 17 | namespace llvm { |
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| 18 | class Pass; |
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| 19 | class Value; |
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| 20 | class BasicBlock; |
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| 21 | class DominatorTree; |
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| 22 | class RegionInfo; |
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| 23 | class LoopInfo; |
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| 24 | class BranchInst; |
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| 25 | } // namespace llvm |
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| 26 | |||
| 27 | namespace polly { |
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| 28 | |||
| 29 | class Scop; |
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| 30 | |||
| 31 | using BBPair = std::pair<llvm::BasicBlock *, llvm::BasicBlock *>; |
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| 32 | /// Execute a Scop conditionally wrt @p RTC. |
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| 33 | /// |
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| 34 | /// In the CFG the optimized code of the Scop is generated next to the |
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| 35 | /// original code. Both the new and the original version of the code remain |
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| 36 | /// in the CFG. A branch statement decides which version is executed based on |
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| 37 | /// the runtime value of @p RTC. |
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| 38 | /// |
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| 39 | /// Before transformation: |
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| 40 | /// |
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| 41 | /// bb0 |
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| 42 | /// | |
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| 43 | /// orig_scop |
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| 44 | /// | |
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| 45 | /// bb1 |
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| 46 | /// |
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| 47 | /// After transformation: |
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| 48 | /// bb0 |
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| 49 | /// | |
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| 50 | /// polly.splitBlock |
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| 51 | /// / \. |
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| 52 | /// | startBlock |
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| 53 | /// | | |
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| 54 | /// orig_scop new_scop |
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| 55 | /// \ / |
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| 56 | /// \ / |
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| 57 | /// bb1 (joinBlock) |
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| 58 | /// |
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| 59 | /// @param S The Scop to execute conditionally. |
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| 60 | /// @param P A reference to the pass calling this function. |
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| 61 | /// @param RTC The runtime condition checked before executing the new SCoP. |
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| 62 | /// |
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| 63 | /// @return An std::pair: |
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| 64 | /// - The first element is a BBPair of (StartBlock, EndBlock). |
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| 65 | /// - The second element is the BranchInst which conditionally |
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| 66 | /// branches to the SCoP based on the RTC. |
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| 67 | /// |
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| 68 | std::pair<BBPair, llvm::BranchInst *> |
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| 69 | executeScopConditionally(Scop &S, llvm::Value *RTC, llvm::DominatorTree &DT, |
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| 70 | llvm::RegionInfo &RI, llvm::LoopInfo &LI); |
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| 71 | } // namespace polly |
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| 72 | #endif |