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 TARGET_X86_H 16 #define TARGET_X86_H 17 18 #include "llvm/Support/CodeGen.h" 19 20 namespace llvm { 21 22 class FunctionPass; 23 class ImmutablePass; 24 class JITCodeEmitter; 25 class X86TargetMachine; 26 27 /// createX86AtomicExpandPass - This pass expands atomic operations that cannot 28 /// be handled natively in terms of a loop using cmpxchg. 29 FunctionPass *createX86AtomicExpandPass(const X86TargetMachine *TM); 30 31 /// createX86ISelDag - This pass converts a legalized DAG into a 32 /// X86-specific DAG, ready for instruction scheduling. 33 /// 34 FunctionPass *createX86ISelDag(X86TargetMachine &TM, 35 CodeGenOpt::Level OptLevel); 36 37 /// createX86GlobalBaseRegPass - This pass initializes a global base 38 /// register for PIC on x86-32. 39 FunctionPass* createX86GlobalBaseRegPass(); 40 41 /// createCleanupLocalDynamicTLSPass() - This pass combines multiple accesses 42 /// to local-dynamic TLS variables so that the TLS base address for the module 43 /// is only fetched once per execution path through the function. 44 FunctionPass *createCleanupLocalDynamicTLSPass(); 45 46 /// createX86FloatingPointStackifierPass - This function returns a pass which 47 /// converts floating point register references and pseudo instructions into 48 /// floating point stack references and physical instructions. 49 /// 50 FunctionPass *createX86FloatingPointStackifierPass(); 51 52 /// createX86IssueVZeroUpperPass - This pass inserts AVX vzeroupper instructions 53 /// before each call to avoid transition penalty between functions encoded with 54 /// AVX and SSE. 55 FunctionPass *createX86IssueVZeroUpperPass(); 56 57 /// createX86CodeEmitterPass - Return a pass that emits the collected X86 code 58 /// to the specified MCE object. 59 FunctionPass *createX86JITCodeEmitterPass(X86TargetMachine &TM, 60 JITCodeEmitter &JCE); 61 62 /// createX86EmitCodeToMemory - Returns a pass that converts a register 63 /// allocated function into raw machine code in a dynamically 64 /// allocated chunk of memory. 65 /// 66 FunctionPass *createEmitX86CodeToMemory(); 67 68 /// \brief Creates an X86-specific Target Transformation Info pass. 69 ImmutablePass *createX86TargetTransformInfoPass(const X86TargetMachine *TM); 70 71 /// createX86PadShortFunctions - Return a pass that pads short functions 72 /// with NOOPs. This will prevent a stall when returning on the Atom. 73 FunctionPass *createX86PadShortFunctions(); 74 /// createX86FixupLEAs - Return a a pass that selectively replaces 75 /// certain instructions (like add, sub, inc, dec, some shifts, 76 /// and some multiplies) by equivalent LEA instructions, in order 77 /// to eliminate execution delays in some Atom processors. 78 FunctionPass *createX86FixupLEAs(); 79 80 } // End llvm namespace 81 82 #endif 83