Pirama Arumuga Nainar | d285ad0 | 2022-02-08 09:26:56 -0800 | [diff] [blame] | 1 | //===- llvm/CodeGen/PBQPRAConstraint.h --------------------------*- C++ -*-===// |
| 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 defines the PBQPBuilder interface, for classes which build PBQP |
| 10 | // instances to represent register allocation problems, and the RegAllocPBQP |
| 11 | // interface. |
| 12 | // |
| 13 | //===----------------------------------------------------------------------===// |
| 14 | |
| 15 | #ifndef LLVM_CODEGEN_PBQPRACONSTRAINT_H |
| 16 | #define LLVM_CODEGEN_PBQPRACONSTRAINT_H |
| 17 | |
| 18 | #include <algorithm> |
| 19 | #include <memory> |
| 20 | #include <vector> |
| 21 | |
| 22 | namespace llvm { |
| 23 | |
| 24 | namespace PBQP { |
| 25 | namespace RegAlloc { |
| 26 | |
| 27 | // Forward declare PBQP graph class. |
| 28 | class PBQPRAGraph; |
| 29 | |
| 30 | } // end namespace RegAlloc |
| 31 | } // end namespace PBQP |
| 32 | |
| 33 | using PBQPRAGraph = PBQP::RegAlloc::PBQPRAGraph; |
| 34 | |
| 35 | /// Abstract base for classes implementing PBQP register allocation |
| 36 | /// constraints (e.g. Spill-costs, interference, coalescing). |
| 37 | class PBQPRAConstraint { |
| 38 | public: |
| 39 | virtual ~PBQPRAConstraint() = 0; |
| 40 | virtual void apply(PBQPRAGraph &G) = 0; |
| 41 | |
| 42 | private: |
| 43 | virtual void anchor(); |
| 44 | }; |
| 45 | |
| 46 | /// PBQP register allocation constraint composer. |
| 47 | /// |
| 48 | /// Constraints added to this list will be applied, in the order that they are |
| 49 | /// added, to the PBQP graph. |
| 50 | class PBQPRAConstraintList : public PBQPRAConstraint { |
| 51 | public: |
| 52 | void apply(PBQPRAGraph &G) override { |
| 53 | for (auto &C : Constraints) |
| 54 | C->apply(G); |
| 55 | } |
| 56 | |
| 57 | void addConstraint(std::unique_ptr<PBQPRAConstraint> C) { |
| 58 | if (C) |
| 59 | Constraints.push_back(std::move(C)); |
| 60 | } |
| 61 | |
| 62 | private: |
| 63 | std::vector<std::unique_ptr<PBQPRAConstraint>> Constraints; |
| 64 | |
| 65 | void anchor() override; |
| 66 | }; |
| 67 | |
| 68 | } // end namespace llvm |
| 69 | |
| 70 | #endif // LLVM_CODEGEN_PBQPRACONSTRAINT_H |