1 //===-- X86.h - Top-level interface for X86 representation ------*- 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 contains the entry points for global functions defined in the x86 10 // target library, as used by the LLVM JIT. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_LIB_TARGET_X86_X86_H 15 #define LLVM_LIB_TARGET_X86_X86_H 16 17 #include "llvm/Support/CodeGen.h" 18 19 namespace llvm { 20 21 class FunctionPass; 22 class InstructionSelector; 23 class PassRegistry; 24 class X86RegisterBankInfo; 25 class X86Subtarget; 26 class X86TargetMachine; 27 28 /// This pass converts a legalized DAG into a X86-specific DAG, ready for 29 /// instruction scheduling. 30 FunctionPass *createX86ISelDag(X86TargetMachine &TM, 31 CodeGenOpt::Level OptLevel); 32 33 /// This pass initializes a global base register for PIC on x86-32. 34 FunctionPass *createX86GlobalBaseRegPass(); 35 36 /// This pass combines multiple accesses to local-dynamic TLS variables so that 37 /// the TLS base address for the module is only fetched once per execution path 38 /// through the function. 39 FunctionPass *createCleanupLocalDynamicTLSPass(); 40 41 /// This function returns a pass which converts floating-point register 42 /// references and pseudo instructions into floating-point stack references and 43 /// physical instructions. 44 FunctionPass *createX86FloatingPointStackifierPass(); 45 46 /// This pass inserts AVX vzeroupper instructions before each call to avoid 47 /// transition penalty between functions encoded with AVX and SSE. 48 FunctionPass *createX86IssueVZeroUpperPass(); 49 50 /// This pass inserts ENDBR instructions before indirect jump/call 51 /// destinations as part of CET IBT mechanism. 52 FunctionPass *createX86IndirectBranchTrackingPass(); 53 54 /// Return a pass that pads short functions with NOOPs. 55 /// This will prevent a stall when returning on the Atom. 56 FunctionPass *createX86PadShortFunctions(); 57 58 /// Return a pass that selectively replaces certain instructions (like add, 59 /// sub, inc, dec, some shifts, and some multiplies) by equivalent LEA 60 /// instructions, in order to eliminate execution delays in some processors. 61 FunctionPass *createX86FixupLEAs(); 62 63 /// Return a pass that removes redundant LEA instructions and redundant address 64 /// recalculations. 65 FunctionPass *createX86OptimizeLEAs(); 66 67 /// Return a pass that transforms setcc + movzx pairs into xor + setcc. 68 FunctionPass *createX86FixupSetCC(); 69 70 /// Return a pass that avoids creating store forward block issues in the hardware. 71 FunctionPass *createX86AvoidStoreForwardingBlocks(); 72 73 /// Return a pass that lowers EFLAGS copy pseudo instructions. 74 FunctionPass *createX86FlagsCopyLoweringPass(); 75 76 /// Return a pass that expands WinAlloca pseudo-instructions. 77 FunctionPass *createX86WinAllocaExpander(); 78 79 /// Return a pass that inserts int3 at the end of the function if it ends with a 80 /// CALL instruction. The pass does the same for each funclet as well. This 81 /// ensures that the open interval of function start and end PCs contains all 82 /// return addresses for the benefit of the Windows x64 unwinder. 83 FunctionPass *createX86AvoidTrailingCallPass(); 84 85 /// Return a pass that optimizes the code-size of x86 call sequences. This is 86 /// done by replacing esp-relative movs with pushes. 87 FunctionPass *createX86CallFrameOptimization(); 88 89 /// Return an IR pass that inserts EH registration stack objects and explicit 90 /// EH state updates. This pass must run after EH preparation, which does 91 /// Windows-specific but architecture-neutral preparation. 92 FunctionPass *createX86WinEHStatePass(); 93 94 /// Return a Machine IR pass that expands X86-specific pseudo 95 /// instructions into a sequence of actual instructions. This pass 96 /// must run after prologue/epilogue insertion and before lowering 97 /// the MachineInstr to MC. 98 FunctionPass *createX86ExpandPseudoPass(); 99 100 /// This pass converts X86 cmov instructions into branch when profitable. 101 FunctionPass *createX86CmovConverterPass(); 102 103 /// Return a Machine IR pass that selectively replaces 104 /// certain byte and word instructions by equivalent 32 bit instructions, 105 /// in order to eliminate partial register usage, false dependences on 106 /// the upper portions of registers, and to save code size. 107 FunctionPass *createX86FixupBWInsts(); 108 109 /// Return a Machine IR pass that reassigns instruction chains from one domain 110 /// to another, when profitable. 111 FunctionPass *createX86DomainReassignmentPass(); 112 113 /// This pass replaces EVEX encoded of AVX-512 instructiosn by VEX 114 /// encoding when possible in order to reduce code size. 115 FunctionPass *createX86EvexToVexInsts(); 116 117 /// This pass creates the thunks for the retpoline feature. 118 FunctionPass *createX86IndirectThunksPass(); 119 120 /// This pass ensures instructions featuring a memory operand 121 /// have distinctive <LineNumber, Discriminator> (with respect to eachother) 122 FunctionPass *createX86DiscriminateMemOpsPass(); 123 124 /// This pass applies profiling information to insert cache prefetches. 125 FunctionPass *createX86InsertPrefetchPass(); 126 127 /// This pass insert wait instruction after X87 instructions which could raise 128 /// fp exceptions when strict-fp enabled. 129 FunctionPass *createX86InsertX87waitPass(); 130 131 /// This pass optimizes arithmetic based on knowledge that is only used by 132 /// a reduction sequence and is therefore safe to reassociate in interesting 133 /// ways. 134 FunctionPass *createX86PartialReductionPass(); 135 136 InstructionSelector *createX86InstructionSelector(const X86TargetMachine &TM, 137 X86Subtarget &, 138 X86RegisterBankInfo &); 139 140 FunctionPass *createX86LoadValueInjectionLoadHardeningPass(); 141 FunctionPass *createX86LoadValueInjectionRetHardeningPass(); 142 FunctionPass *createX86SpeculativeLoadHardeningPass(); 143 FunctionPass *createX86SpeculativeExecutionSideEffectSuppression(); 144 145 void initializeEvexToVexInstPassPass(PassRegistry &); 146 void initializeFixupBWInstPassPass(PassRegistry &); 147 void initializeFixupLEAPassPass(PassRegistry &); 148 void initializeFPSPass(PassRegistry &); 149 void initializeWinEHStatePassPass(PassRegistry &); 150 void initializeX86AvoidSFBPassPass(PassRegistry &); 151 void initializeX86AvoidTrailingCallPassPass(PassRegistry &); 152 void initializeX86CallFrameOptimizationPass(PassRegistry &); 153 void initializeX86CmovConverterPassPass(PassRegistry &); 154 void initializeX86DomainReassignmentPass(PassRegistry &); 155 void initializeX86ExecutionDomainFixPass(PassRegistry &); 156 void initializeX86ExpandPseudoPass(PassRegistry &); 157 void initializeX86FixupSetCCPassPass(PassRegistry &); 158 void initializeX86FlagsCopyLoweringPassPass(PassRegistry &); 159 void initializeX86LoadValueInjectionLoadHardeningPassPass(PassRegistry &); 160 void initializeX86LoadValueInjectionRetHardeningPassPass(PassRegistry &); 161 void initializeX86OptimizeLEAPassPass(PassRegistry &); 162 void initializeX86PartialReductionPass(PassRegistry &); 163 void initializeX86SpeculativeLoadHardeningPassPass(PassRegistry &); 164 void initializeX86SpeculativeExecutionSideEffectSuppressionPass(PassRegistry &); 165 166 namespace X86AS { 167 enum : unsigned { 168 GS = 256, 169 FS = 257, 170 SS = 258, 171 PTR32_SPTR = 270, 172 PTR32_UPTR = 271, 173 PTR64 = 272 174 }; 175 } // End X86AS namespace 176 177 } // End llvm namespace 178 179 #endif 180