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2f44405590
Introduce three pseudo instructions to be used during DAG ISel to represent v8.1-m low-overhead loops. One maps to set_loop_iterations while loop_decrement_reg is lowered to two, so that we can separate the decrement and branching operations. The pseudo instructions are expanded pre-emission, where we can still decide whether we actually want to generate a low-overhead loop, in a new pass: ARMLowOverheadLoops. The pass currently bails, reverting to an sub, icmp and br, in the cases where a call or stack spill/restore happens between the decrement and branching instructions, or if the loop is too large. Differential Revision: https://reviews.llvm.org/D63476 llvm-svn: 364288
74 lines
2.6 KiB
C++
74 lines
2.6 KiB
C++
//===-- ARM.h - Top-level interface for ARM representation ------*- 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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// This file contains the entry points for global functions defined in the LLVM
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// ARM back-end.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_ARM_ARM_H
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#define LLVM_LIB_TARGET_ARM_ARM_H
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#include "llvm/IR/LegacyPassManager.h"
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#include "llvm/Support/CodeGen.h"
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#include <functional>
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#include <vector>
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namespace llvm {
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class ARMAsmPrinter;
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class ARMBaseTargetMachine;
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class ARMRegisterBankInfo;
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class ARMSubtarget;
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struct BasicBlockInfo;
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class Function;
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class FunctionPass;
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class InstructionSelector;
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class MachineBasicBlock;
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class MachineFunction;
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class MachineInstr;
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class MCInst;
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class PassRegistry;
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FunctionPass *createARMLowOverheadLoopsPass();
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Pass *createARMParallelDSPPass();
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FunctionPass *createARMISelDag(ARMBaseTargetMachine &TM,
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CodeGenOpt::Level OptLevel);
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FunctionPass *createA15SDOptimizerPass();
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FunctionPass *createARMLoadStoreOptimizationPass(bool PreAlloc = false);
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FunctionPass *createARMExpandPseudoPass();
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FunctionPass *createARMCodeGenPreparePass();
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FunctionPass *createARMConstantIslandPass();
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FunctionPass *createMLxExpansionPass();
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FunctionPass *createThumb2ITBlockPass();
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FunctionPass *createMVEVPTBlockPass();
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FunctionPass *createARMOptimizeBarriersPass();
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FunctionPass *createThumb2SizeReductionPass(
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std::function<bool(const Function &)> Ftor = nullptr);
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InstructionSelector *
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createARMInstructionSelector(const ARMBaseTargetMachine &TM, const ARMSubtarget &STI,
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const ARMRegisterBankInfo &RBI);
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void LowerARMMachineInstrToMCInst(const MachineInstr *MI, MCInst &OutMI,
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ARMAsmPrinter &AP);
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void initializeARMParallelDSPPass(PassRegistry &);
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void initializeARMLoadStoreOptPass(PassRegistry &);
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void initializeARMPreAllocLoadStoreOptPass(PassRegistry &);
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void initializeARMCodeGenPreparePass(PassRegistry &);
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void initializeARMConstantIslandsPass(PassRegistry &);
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void initializeARMExpandPseudoPass(PassRegistry &);
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void initializeThumb2SizeReducePass(PassRegistry &);
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void initializeThumb2ITBlockPass(PassRegistry &);
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void initializeMVEVPTBlockPass(PassRegistry &);
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void initializeARMLowOverheadLoopsPass(PassRegistry &);
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} // end namespace llvm
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#endif // LLVM_LIB_TARGET_ARM_ARM_H
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