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 X86TargetMachine; 25 26 /// This pass converts a legalized DAG into a X86-specific DAG, ready for 27 /// instruction scheduling. 28 FunctionPass *createX86ISelDag(X86TargetMachine &TM, 29 CodeGenOpt::Level OptLevel); 30 31 /// This pass initializes a global base register for PIC on x86-32. 32 FunctionPass* createX86GlobalBaseRegPass(); 33 34 /// This pass combines multiple accesses to local-dynamic TLS variables so that 35 /// the TLS base address for the module is only fetched once per execution path 36 /// through the function. 37 FunctionPass *createCleanupLocalDynamicTLSPass(); 38 39 /// This function returns a pass which converts floating-point register 40 /// references and pseudo instructions into floating-point stack references and 41 /// physical instructions. 42 FunctionPass *createX86FloatingPointStackifierPass(); 43 44 /// This pass inserts AVX vzeroupper instructions before each call to avoid 45 /// transition penalty between functions encoded with AVX and SSE. 46 FunctionPass *createX86IssueVZeroUpperPass(); 47 48 /// Return a pass that pads short functions with NOOPs. 49 /// This will prevent a stall when returning on the Atom. 50 FunctionPass *createX86PadShortFunctions(); 51 52 /// Return a a pass that selectively replaces certain instructions (like add, 53 /// sub, inc, dec, some shifts, and some multiplies) by equivalent LEA 54 /// instructions, in order to eliminate execution delays in some processors. 55 FunctionPass *createX86FixupLEAs(); 56 57 /// Return a pass that removes redundant address recalculations. 58 FunctionPass *createX86OptimizeLEAs(); 59 60 /// Return a pass that optimizes the code-size of x86 call sequences. This is 61 /// done by replacing esp-relative movs with pushes. 62 FunctionPass *createX86CallFrameOptimization(); 63 64 /// Return an IR pass that inserts EH registration stack objects and explicit 65 /// EH state updates. This pass must run after EH preparation, which does 66 /// Windows-specific but architecture-neutral preparation. 67 FunctionPass *createX86WinEHStatePass(); 68 69 /// Return a Machine IR pass that expands X86-specific pseudo 70 /// instructions into a sequence of actual instructions. This pass 71 /// must run after prologue/epilogue insertion and before lowering 72 /// the MachineInstr to MC. 73 FunctionPass *createX86ExpandPseudoPass(); 74 } // End llvm namespace 75 76 #endif 77