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
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 Target;
32 class StringRef;
33 class raw_pwrite_stream;
34 class raw_ostream;
35
36 extern Target ThePPC32Target;
37 extern Target ThePPC64Target;
38 extern Target ThePPC64LETarget;
39
40 MCCodeEmitter *createPPCMCCodeEmitter(const MCInstrInfo &MCII,
41 const MCRegisterInfo &MRI,
42 MCContext &Ctx);
43
44 MCAsmBackend *createPPCAsmBackend(const Target &T, const MCRegisterInfo &MRI,
45 StringRef TT, StringRef CPU);
46
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,
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.
isRunOfOnes(unsigned Val,unsigned & MB,unsigned & ME)59 static 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