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 PassRegistry; 25class X86TargetMachine; 26 27/// This pass converts a legalized DAG into a X86-specific DAG, ready for 28/// instruction scheduling. 29FunctionPass *createX86ISelDag(X86TargetMachine &TM, 30 CodeGenOpt::Level OptLevel); 31 32/// This pass initializes a global base register for PIC on x86-32. 33FunctionPass *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. 38FunctionPass *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. 43FunctionPass *createX86FloatingPointStackifierPass(); 44 45/// This pass inserts AVX vzeroupper instructions before each call to avoid 46/// transition penalty between functions encoded with AVX and SSE. 47FunctionPass *createX86IssueVZeroUpperPass(); 48 49/// Return a pass that pads short functions with NOOPs. 50/// This will prevent a stall when returning on the Atom. 51FunctionPass *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. 56FunctionPass *createX86FixupLEAs(); 57 58/// Return a pass that removes redundant LEA instructions and redundant address 59/// recalculations. 60FunctionPass *createX86OptimizeLEAs(); 61 62/// Return a pass that transforms setcc + movzx pairs into xor + setcc. 63FunctionPass *createX86FixupSetCC(); 64 65/// Return a pass that expands WinAlloca pseudo-instructions. 66FunctionPass *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. 70FunctionPass *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. 75FunctionPass *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. 81FunctionPass *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. 87FunctionPass *createX86FixupBWInsts(); 88 89void initializeFixupBWInstPassPass(PassRegistry &); 90} // End llvm namespace 91 92#endif 93