6024e5c395
clang 20.0.0 (based on r547379) from build 12806354. Bug: http://b/379133546 Test: N/A Change-Id: I2eb8938af55d809de674be63cb30cf27e801862b Upstream-Commit: ad834e67b1105d15ef907f6255d4c96e8e733f57
62 lines
2.4 KiB
C++
62 lines
2.4 KiB
C++
//===- MacroFusion.h - Macro Fusion -----------------------------*- C++ -*-===//
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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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/// \file This file contains the definition of the DAG scheduling mutation to
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/// pair instructions back to back.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_MACROFUSION_H
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#define LLVM_CODEGEN_MACROFUSION_H
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#include "llvm/ADT/ArrayRef.h"
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#include <memory>
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namespace llvm {
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class MachineInstr;
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class ScheduleDAGMutation;
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class TargetInstrInfo;
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class TargetSubtargetInfo;
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class ScheduleDAGInstrs;
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class SUnit;
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/// Check if the instr pair, FirstMI and SecondMI, should be fused
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/// together. Given SecondMI, when FirstMI is unspecified, then check if
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/// SecondMI may be part of a fused pair at all.
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using MacroFusionPredTy = bool (*)(const TargetInstrInfo &TII,
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const TargetSubtargetInfo &STI,
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const MachineInstr *FirstMI,
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const MachineInstr &SecondMI);
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/// Checks if the number of cluster edges between SU and its predecessors is
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/// less than FuseLimit
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bool hasLessThanNumFused(const SUnit &SU, unsigned FuseLimit);
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/// Create an artificial edge between FirstSU and SecondSU.
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/// Make data dependencies from the FirstSU also dependent on the SecondSU to
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/// prevent them from being scheduled between the FirstSU and the SecondSU
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/// and vice-versa.
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/// Fusing more than 2 instructions is not currently supported.
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bool fuseInstructionPair(ScheduleDAGInstrs &DAG, SUnit &FirstSU,
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SUnit &SecondSU);
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/// Create a DAG scheduling mutation to pair instructions back to back
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/// for instructions that benefit according to the target-specific
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/// predicate functions. shouldScheduleAdjacent will be true if any of the
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/// provided predicates are true.
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/// If BranchOnly is true, only branch instructions with one of their
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/// predecessors will be fused.
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std::unique_ptr<ScheduleDAGMutation>
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createMacroFusionDAGMutation(ArrayRef<MacroFusionPredTy> Predicates,
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bool BranchOnly = false);
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} // end namespace llvm
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#endif // LLVM_CODEGEN_MACROFUSION_H
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