1 //===-- X86.h - Top-level interface for X86 representation ------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file contains the entry points for global functions defined in the x86 11 // target library, as used by the LLVM JIT. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #ifndef LLVM_LIB_TARGET_X86_X86_H 16 #define LLVM_LIB_TARGET_X86_X86_H 17 18 #include "llvm/Support/CodeGen.h" 19 20 namespace llvm { 21 22 class FunctionPass; 23 class ImmutablePass; 24 class PassRegistry; 25 class X86TargetMachine; 26 27 /// This pass converts a legalized DAG into a X86-specific DAG, ready for 28 /// instruction scheduling. 29 FunctionPass *createX86ISelDag(X86TargetMachine &TM, 30 CodeGenOpt::Level OptLevel); 31 32 /// This pass initializes a global base register for PIC on x86-32. 33 FunctionPass *createX86GlobalBaseRegPass(); 34 35 /// This pass combines multiple accesses to local-dynamic TLS variables so that 36 /// the TLS base address for the module is only fetched once per execution path 37 /// through the function. 38 FunctionPass *createCleanupLocalDynamicTLSPass(); 39 40 /// This function returns a pass which converts floating-point register 41 /// references and pseudo instructions into floating-point stack references and 42 /// physical instructions. 43 FunctionPass *createX86FloatingPointStackifierPass(); 44 45 /// This pass inserts AVX vzeroupper instructions before each call to avoid 46 /// transition penalty between functions encoded with AVX and SSE. 47 FunctionPass *createX86IssueVZeroUpperPass(); 48 49 /// Return a pass that pads short functions with NOOPs. 50 /// This will prevent a stall when returning on the Atom. 51 FunctionPass *createX86PadShortFunctions(); 52 53 /// Return a pass that selectively replaces certain instructions (like add, 54 /// sub, inc, dec, some shifts, and some multiplies) by equivalent LEA 55 /// instructions, in order to eliminate execution delays in some processors. 56 FunctionPass *createX86FixupLEAs(); 57 58 /// Return a pass that removes redundant LEA instructions and redundant address 59 /// recalculations. 60 FunctionPass *createX86OptimizeLEAs(); 61 62 /// Return a pass that transforms setcc + movzx pairs into xor + setcc. 63 FunctionPass *createX86FixupSetCC(); 64 65 /// Return a pass that expands WinAlloca pseudo-instructions. 66 FunctionPass *createX86WinAllocaExpander(); 67 68 /// Return a pass that optimizes the code-size of x86 call sequences. This is 69 /// done by replacing esp-relative movs with pushes. 70 FunctionPass *createX86CallFrameOptimization(); 71 72 /// Return an IR pass that inserts EH registration stack objects and explicit 73 /// EH state updates. This pass must run after EH preparation, which does 74 /// Windows-specific but architecture-neutral preparation. 75 FunctionPass *createX86WinEHStatePass(); 76 77 /// Return a Machine IR pass that expands X86-specific pseudo 78 /// instructions into a sequence of actual instructions. This pass 79 /// must run after prologue/epilogue insertion and before lowering 80 /// the MachineInstr to MC. 81 FunctionPass *createX86ExpandPseudoPass(); 82 83 /// Return a Machine IR pass that selectively replaces 84 /// certain byte and word instructions by equivalent 32 bit instructions, 85 /// in order to eliminate partial register usage, false dependences on 86 /// the upper portions of registers, and to save code size. 87 FunctionPass *createX86FixupBWInsts(); 88 89 void initializeFixupBWInstPassPass(PassRegistry &); 90 } // End llvm namespace 91 92 #endif 93
