LLVM  4.0.0
PPCMCTargetDesc.h
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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"
22 
23 namespace llvm {
24 class MCAsmBackend;
25 class MCCodeEmitter;
26 class MCContext;
27 class MCInstrInfo;
28 class MCObjectWriter;
29 class MCRegisterInfo;
30 class MCSubtargetInfo;
31 class MCTargetOptions;
32 class Target;
33 class Triple;
34 class StringRef;
35 class raw_pwrite_stream;
36 class raw_ostream;
37 
41 
42 MCCodeEmitter *createPPCMCCodeEmitter(const MCInstrInfo &MCII,
43  const MCRegisterInfo &MRI,
44  MCContext &Ctx);
45 
46 MCAsmBackend *createPPCAsmBackend(const Target &T, const MCRegisterInfo &MRI,
47  const Triple &TT, StringRef CPU,
48  const MCTargetOptions &Options);
49 
50 /// Construct an PPC ELF object writer.
51 MCObjectWriter *createPPCELFObjectWriter(raw_pwrite_stream &OS, bool Is64Bit,
52  bool IsLittleEndian, uint8_t OSABI);
53 /// Construct a PPC Mach-O object writer.
54 MCObjectWriter *createPPCMachObjectWriter(raw_pwrite_stream &OS, bool Is64Bit,
56  uint32_t CPUSubtype);
57 
58 /// Returns true iff Val consists of one contiguous run of 1s with any number of
59 /// 0s on either side. The 1s are allowed to wrap from LSB to MSB, so
60 /// 0x000FFF0, 0x0000FFFF, and 0xFF0000FF are all runs. 0x0F0F0000 is not,
61 /// since all 1s are not contiguous.
62 static inline bool isRunOfOnes(unsigned Val, unsigned &MB, unsigned &ME) {
63  if (!Val)
64  return false;
65 
66  if (isShiftedMask_32(Val)) {
67  // look for the first non-zero bit
68  MB = countLeadingZeros(Val);
69  // look for the first zero bit after the run of ones
70  ME = countLeadingZeros((Val - 1) ^ Val);
71  return true;
72  } else {
73  Val = ~Val; // invert mask
74  if (isShiftedMask_32(Val)) {
75  // effectively look for the first zero bit
76  ME = countLeadingZeros(Val) - 1;
77  // effectively look for the first one bit after the run of zeros
78  MB = countLeadingZeros((Val - 1) ^ Val) + 1;
79  return true;
80  }
81  }
82  // no run present
83  return false;
84 }
85 
86 } // End llvm namespace
87 
88 // Generated files will use "namespace PPC". To avoid symbol clash,
89 // undefine PPC here. PPC may be predefined on some hosts.
90 #undef PPC
91 
92 // Defines symbolic names for PowerPC registers. This defines a mapping from
93 // register name to register number.
94 //
95 #define GET_REGINFO_ENUM
96 #include "PPCGenRegisterInfo.inc"
97 
98 // Defines symbolic names for the PowerPC instructions.
99 //
100 #define GET_INSTRINFO_ENUM
101 #include "PPCGenInstrInfo.inc"
102 
103 #define GET_SUBTARGETINFO_ENUM
104 #include "PPCGenSubtargetInfo.inc"
105 
106 #endif
MCAsmBackend * createPPCAsmBackend(const Target &T, const MCRegisterInfo &MRI, const Triple &TT, StringRef CPU, const MCTargetOptions &Options)
Target & getThePPC32Target()
std::size_t countLeadingZeros(T Val, ZeroBehavior ZB=ZB_Width)
Count number of 0's from the most significant bit to the least stopping at the first 1...
Definition: MathExtras.h:180
MCObjectWriter * createPPCELFObjectWriter(raw_pwrite_stream &OS, bool Is64Bit, bool IsLittleEndian, uint8_t OSABI)
Construct an PPC ELF object writer.
Target & getThePPC64Target()
unsigned const MachineRegisterInfo * MRI
MCObjectWriter * createPPCMachObjectWriter(raw_pwrite_stream &OS, bool Is64Bit, uint32_t CPUType, uint32_t CPUSubtype)
Construct a PPC Mach-O object writer.
CPUType
These values correspond to the CV_CPU_TYPE_e enumeration, and are documented here: https://msdn...
Definition: CodeView.h:73
static const char * Target
Target & getThePPC64LETarget()
static bool isRunOfOnes(unsigned Val, unsigned &MB, unsigned &ME)
Returns true iff Val consists of one contiguous run of 1s with any number of 0s on either side...
constexpr bool isShiftedMask_32(uint32_t Value)
isShiftedMask_32 - This function returns true if the argument contains a non-empty sequence of ones w...
Definition: MathExtras.h:387
MCCodeEmitter * createPPCMCCodeEmitter(const MCInstrInfo &MCII, const MCRegisterInfo &MRI, MCContext &Ctx)