1 //===-- PPCMCTargetDesc.h - PowerPC Target Descriptions ---------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file provides PowerPC specific target descriptions.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_LIB_TARGET_POWERPC_MCTARGETDESC_PPCMCTARGETDESC_H
15 #define LLVM_LIB_TARGET_POWERPC_MCTARGETDESC_PPCMCTARGETDESC_H
17 // GCC #defines PPC on Linux but we use it as our namespace name
20 #include "llvm/Support/DataTypes.h"
21 #include "llvm/Support/MathExtras.h"
30 class MCSubtargetInfo;
33 class raw_pwrite_stream;
36 extern Target ThePPC32Target;
37 extern Target ThePPC64Target;
38 extern Target ThePPC64LETarget;
40 MCCodeEmitter *createPPCMCCodeEmitter(const MCInstrInfo &MCII,
41 const MCRegisterInfo &MRI,
44 MCAsmBackend *createPPCAsmBackend(const Target &T, const MCRegisterInfo &MRI,
45 StringRef TT, StringRef CPU);
47 /// Construct an PPC ELF object writer.
48 MCObjectWriter *createPPCELFObjectWriter(raw_pwrite_stream &OS, bool Is64Bit,
49 bool IsLittleEndian, uint8_t OSABI);
50 /// Construct a PPC Mach-O object writer.
51 MCObjectWriter *createPPCMachObjectWriter(raw_pwrite_stream &OS, bool Is64Bit,
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.
59 static inline bool isRunOfOnes(unsigned Val, unsigned &MB, unsigned &ME) {
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);
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;
83 } // End llvm namespace
85 // Generated files will use "namespace PPC". To avoid symbol clash,
86 // undefine PPC here. PPC may be predefined on some hosts.
89 // Defines symbolic names for PowerPC registers. This defines a mapping from
90 // register name to register number.
92 #define GET_REGINFO_ENUM
93 #include "PPCGenRegisterInfo.inc"
95 // Defines symbolic names for the PowerPC instructions.
97 #define GET_INSTRINFO_ENUM
98 #include "PPCGenInstrInfo.inc"
100 #define GET_SUBTARGETINFO_ENUM
101 #include "PPCGenSubtargetInfo.inc"