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f980fa1767
Arm specific codegen prepare is implemented to perform type promotion
on icmp operands, which can enable the removal of uxtb and uxth
(unsigned extend) instructions. This is possible because performing
type promotion before ISel alleviates this duty from the DAG builder
which has to perform legalisation, but has a limited view on data
ranges.
The pass visits any instruction operand of an icmp and creates a
worklist to traverse the use-def tree to determine whether the values
can simply be promoted. Our concern is values in the registers
overflowing the narrow (i8, i16) data range, so instructions marked
with nuw can be promoted easily. For add and sub instructions, we are
able to use the parallel dsp instructions to operate on scalar data
types and avoid overflowing bits. Underflowing adds and subs are also
permitted when the result is only used by an unsigned icmp.
Differential Revision: https://reviews.llvm.org/D48832
llvm-svn: 337687
76 lines
2.5 KiB
C++
76 lines
2.5 KiB
C++
//===-- ARM.h - Top-level interface for ARM representation ------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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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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 *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 computeBlockSize(MachineFunction *MF, MachineBasicBlock *MBB,
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BasicBlockInfo &BBI);
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std::vector<BasicBlockInfo> computeAllBlockSizes(MachineFunction *MF);
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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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} // end namespace llvm
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#endif // LLVM_LIB_TARGET_ARM_ARM_H
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