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 20namespace llvm { 21 22class FunctionPass; 23class ImmutablePass; 24class X86TargetMachine; 25 26/// This pass converts a legalized DAG into a X86-specific DAG, ready for 27/// instruction scheduling. 28FunctionPass *createX86ISelDag(X86TargetMachine &TM, 29 CodeGenOpt::Level OptLevel); 30 31/// This pass initializes a global base register for PIC on x86-32. 32FunctionPass* 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. 37FunctionPass *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. 42FunctionPass *createX86FloatingPointStackifierPass(); 43 44/// This pass inserts AVX vzeroupper instructions before each call to avoid 45/// transition penalty between functions encoded with AVX and SSE. 46FunctionPass *createX86IssueVZeroUpperPass(); 47 48/// Return a pass that pads short functions with NOOPs. 49/// This will prevent a stall when returning on the Atom. 50FunctionPass *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. 55FunctionPass *createX86FixupLEAs(); 56 57/// Return a pass that removes redundant address recalculations. 58FunctionPass *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. 62FunctionPass *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. 67FunctionPass *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. 73FunctionPass *createX86ExpandPseudoPass(); 74} // End llvm namespace 75 76#endif 77