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1 //===-- X86.h - Top-level interface for X86 representation ------*- C++ -*-===//
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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 the entry points for global functions defined in the x86
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10 // target library, as used by the LLVM JIT.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #ifndef LLVM_LIB_TARGET_X86_X86_H
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15 #define LLVM_LIB_TARGET_X86_X86_H
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16
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17 #include "llvm/Support/CodeGen.h"
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18
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19 namespace llvm {
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20
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21 class FunctionPass;
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22 class ImmutablePass;
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23 class InstructionSelector;
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24 class ModulePass;
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25 class PassRegistry;
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26 class X86RegisterBankInfo;
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27 class X86Subtarget;
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28 class X86TargetMachine;
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29
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30 /// This pass converts a legalized DAG into a X86-specific DAG, ready for
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31 /// instruction scheduling.
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32 FunctionPass *createX86ISelDag(X86TargetMachine &TM,
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33 CodeGenOpt::Level OptLevel);
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34
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35 /// This pass initializes a global base register for PIC on x86-32.
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36 FunctionPass *createX86GlobalBaseRegPass();
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37
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38 /// This pass combines multiple accesses to local-dynamic TLS variables so that
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39 /// the TLS base address for the module is only fetched once per execution path
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40 /// through the function.
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41 FunctionPass *createCleanupLocalDynamicTLSPass();
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42
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43 /// This function returns a pass which converts floating-point register
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44 /// references and pseudo instructions into floating-point stack references and
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45 /// physical instructions.
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46 FunctionPass *createX86FloatingPointStackifierPass();
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47
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48 /// This pass inserts AVX vzeroupper instructions before each call to avoid
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49 /// transition penalty between functions encoded with AVX and SSE.
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50 FunctionPass *createX86IssueVZeroUpperPass();
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51
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52 /// This pass inserts ENDBR instructions before indirect jump/call
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53 /// destinations as part of CET IBT mechanism.
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54 FunctionPass *createX86IndirectBranchTrackingPass();
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55
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56 /// Return a pass that pads short functions with NOOPs.
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57 /// This will prevent a stall when returning on the Atom.
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58 FunctionPass *createX86PadShortFunctions();
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59
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60 /// Return a pass that selectively replaces certain instructions (like add,
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61 /// sub, inc, dec, some shifts, and some multiplies) by equivalent LEA
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62 /// instructions, in order to eliminate execution delays in some processors.
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63 FunctionPass *createX86FixupLEAs();
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64
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65 /// Return a pass that removes redundant LEA instructions and redundant address
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66 /// recalculations.
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67 FunctionPass *createX86OptimizeLEAs();
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68
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69 /// Return a pass that transforms setcc + movzx pairs into xor + setcc.
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70 FunctionPass *createX86FixupSetCC();
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71
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72 /// Return a pass that folds conditional branch jumps.
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73 FunctionPass *createX86CondBrFolding();
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74
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75 /// Return a pass that avoids creating store forward block issues in the hardware.
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76 FunctionPass *createX86AvoidStoreForwardingBlocks();
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77
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78 /// Return a pass that lowers EFLAGS copy pseudo instructions.
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79 FunctionPass *createX86FlagsCopyLoweringPass();
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80
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81 /// Return a pass that expands WinAlloca pseudo-instructions.
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82 FunctionPass *createX86WinAllocaExpander();
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83
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84 /// Return a pass that optimizes the code-size of x86 call sequences. This is
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85 /// done by replacing esp-relative movs with pushes.
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83
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86 FunctionPass *createX86CallFrameOptimization();
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87
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88 /// Return an IR pass that inserts EH registration stack objects and explicit
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89 /// EH state updates. This pass must run after EH preparation, which does
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90 /// Windows-specific but architecture-neutral preparation.
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91 FunctionPass *createX86WinEHStatePass();
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92
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93 /// Return a Machine IR pass that expands X86-specific pseudo
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94 /// instructions into a sequence of actual instructions. This pass
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95 /// must run after prologue/epilogue insertion and before lowering
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96 /// the MachineInstr to MC.
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97 FunctionPass *createX86ExpandPseudoPass();
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98
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99 /// This pass converts X86 cmov instructions into branch when profitable.
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100 FunctionPass *createX86CmovConverterPass();
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101
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102 /// Return a Machine IR pass that selectively replaces
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103 /// certain byte and word instructions by equivalent 32 bit instructions,
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104 /// in order to eliminate partial register usage, false dependences on
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105 /// the upper portions of registers, and to save code size.
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106 FunctionPass *createX86FixupBWInsts();
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107
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108 /// Return a Machine IR pass that reassigns instruction chains from one domain
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109 /// to another, when profitable.
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110 FunctionPass *createX86DomainReassignmentPass();
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111
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112 /// This pass replaces EVEX encoded of AVX-512 instructiosn by VEX
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113 /// encoding when possible in order to reduce code size.
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114 FunctionPass *createX86EvexToVexInsts();
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115
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116 /// This pass creates the thunks for the retpoline feature.
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117 FunctionPass *createX86RetpolineThunksPass();
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118
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119 /// This pass ensures instructions featuring a memory operand
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120 /// have distinctive <LineNumber, Discriminator> (with respect to eachother)
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121 FunctionPass *createX86DiscriminateMemOpsPass();
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122
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123 /// This pass applies profiling information to insert cache prefetches.
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124 FunctionPass *createX86InsertPrefetchPass();
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125
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126 InstructionSelector *createX86InstructionSelector(const X86TargetMachine &TM,
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127 X86Subtarget &,
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128 X86RegisterBankInfo &);
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129
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130 FunctionPass *createX86SpeculativeLoadHardeningPass();
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131
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132 void initializeEvexToVexInstPassPass(PassRegistry &);
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133 void initializeFixupBWInstPassPass(PassRegistry &);
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134 void initializeFixupLEAPassPass(PassRegistry &);
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135 void initializeFPSPass(PassRegistry &);
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136 void initializeWinEHStatePassPass(PassRegistry &);
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137 void initializeX86AvoidSFBPassPass(PassRegistry &);
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138 void initializeX86CallFrameOptimizationPass(PassRegistry &);
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139 void initializeX86CmovConverterPassPass(PassRegistry &);
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140 void initializeX86ExpandPseudoPass(PassRegistry&);
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141 void initializeX86CondBrFoldingPassPass(PassRegistry &);
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142 void initializeX86DomainReassignmentPass(PassRegistry &);
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143 void initializeX86ExecutionDomainFixPass(PassRegistry &);
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144 void initializeX86FlagsCopyLoweringPassPass(PassRegistry &);
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145 void initializeX86SpeculativeLoadHardeningPassPass(PassRegistry &);
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147 } // End llvm namespace
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149 #endif
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