1//===-- PPCMCTargetDesc.h - PowerPC Target Descriptions ---------*- 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 provides PowerPC specific target descriptions. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_LIB_TARGET_POWERPC_MCTARGETDESC_PPCMCTARGETDESC_H 15#define LLVM_LIB_TARGET_POWERPC_MCTARGETDESC_PPCMCTARGETDESC_H 16 17// GCC #defines PPC on Linux but we use it as our namespace name 18#undef PPC 19 20#include "llvm/Support/DataTypes.h" 21#include "llvm/Support/MathExtras.h" 22 23namespace llvm { 24class MCAsmBackend; 25class MCCodeEmitter; 26class MCContext; 27class MCInstrInfo; 28class MCObjectWriter; 29class MCRegisterInfo; 30class MCSubtargetInfo; 31class Target; 32class StringRef; 33class raw_pwrite_stream; 34class raw_ostream; 35 36extern Target ThePPC32Target; 37extern Target ThePPC64Target; 38extern Target ThePPC64LETarget; 39 40MCCodeEmitter *createPPCMCCodeEmitter(const MCInstrInfo &MCII, 41 const MCRegisterInfo &MRI, 42 MCContext &Ctx); 43 44MCAsmBackend *createPPCAsmBackend(const Target &T, const MCRegisterInfo &MRI, 45 StringRef TT, StringRef CPU); 46 47/// Construct an PPC ELF object writer. 48MCObjectWriter *createPPCELFObjectWriter(raw_pwrite_stream &OS, bool Is64Bit, 49 bool IsLittleEndian, uint8_t OSABI); 50/// Construct a PPC Mach-O object writer. 51MCObjectWriter *createPPCMachObjectWriter(raw_pwrite_stream &OS, bool Is64Bit, 52 uint32_t CPUType, 53 uint32_t CPUSubtype); 54 55/// Returns true iff Val consists of one contiguous run of 1s with any number of 56/// 0s on either side. The 1s are allowed to wrap from LSB to MSB, so 57/// 0x000FFF0, 0x0000FFFF, and 0xFF0000FF are all runs. 0x0F0F0000 is not, 58/// since all 1s are not contiguous. 59static inline bool isRunOfOnes(unsigned Val, unsigned &MB, unsigned &ME) { 60 if (!Val) 61 return false; 62 63 if (isShiftedMask_32(Val)) { 64 // look for the first non-zero bit 65 MB = countLeadingZeros(Val); 66 // look for the first zero bit after the run of ones 67 ME = countLeadingZeros((Val - 1) ^ Val); 68 return true; 69 } else { 70 Val = ~Val; // invert mask 71 if (isShiftedMask_32(Val)) { 72 // effectively look for the first zero bit 73 ME = countLeadingZeros(Val) - 1; 74 // effectively look for the first one bit after the run of zeros 75 MB = countLeadingZeros((Val - 1) ^ Val) + 1; 76 return true; 77 } 78 } 79 // no run present 80 return false; 81} 82 83} // End llvm namespace 84 85// Generated files will use "namespace PPC". To avoid symbol clash, 86// undefine PPC here. PPC may be predefined on some hosts. 87#undef PPC 88 89// Defines symbolic names for PowerPC registers. This defines a mapping from 90// register name to register number. 91// 92#define GET_REGINFO_ENUM 93#include "PPCGenRegisterInfo.inc" 94 95// Defines symbolic names for the PowerPC instructions. 96// 97#define GET_INSTRINFO_ENUM 98#include "PPCGenInstrInfo.inc" 99 100#define GET_SUBTARGETINFO_ENUM 101#include "PPCGenSubtargetInfo.inc" 102 103#endif 104