1 //=====-- PPCSubtarget.h - Define Subtarget for the PPC -------*- 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 declares the PowerPC specific subclass of TargetSubtarget.
12 //===----------------------------------------------------------------------===//
14 #ifndef POWERPCSUBTARGET_H
15 #define POWERPCSUBTARGET_H
17 #include "llvm/Target/TargetInstrItineraries.h"
18 #include "llvm/Target/TargetSubtarget.h"
22 // GCC #defines PPC on Linux but we use it as our namespace name
28 // -m directive values.
46 class PPCSubtarget : public TargetSubtarget {
48 enum AsmWriterFlavorTy {
49 OldMnemonic, NewMnemonic, Unset
52 const TargetMachine &TM;
54 /// stackAlignment - The minimum alignment known to hold of the stack frame on
55 /// entry to the function and which must be maintained by every function.
56 unsigned StackAlignment;
58 /// Selected instruction itineraries (one entry per itinerary class.)
59 InstrItineraryData InstrItins;
61 /// Which cpu directive was used.
62 unsigned DarwinDirective;
64 /// AsmFlavor - Which PPC asm dialect to use.
65 AsmWriterFlavorTy AsmFlavor;
67 /// Used by the ISel to turn in optimizations for POWER4-derived architectures
75 bool HasLazyResolverStubs;
77 /// DarwinVers - Nonzero if this is a darwin platform. Otherwise, the numeric
78 /// version of the platform, e.g. 8 = 10.4 (Tiger), 9 = 10.5 (Leopard), etc.
79 unsigned char DarwinVers; // Is any darwin-ppc platform.
81 /// This constructor initializes the data members to match that
82 /// of the specified module.
84 PPCSubtarget(const TargetMachine &TM, const Module &M,
85 const std::string &FS, bool is64Bit);
87 /// ParseSubtargetFeatures - Parses features string setting specified
88 /// subtarget options. Definition of function is auto generated by tblgen.
89 std::string ParseSubtargetFeatures(const std::string &FS,
90 const std::string &CPU);
93 /// SetJITMode - This is called to inform the subtarget info that we are
94 /// producing code for the JIT.
97 /// getStackAlignment - Returns the minimum alignment known to hold of the
98 /// stack frame on entry to the function and which must be maintained by every
99 /// function for this subtarget.
100 unsigned getStackAlignment() const { return StackAlignment; }
102 /// getDarwinDirective - Returns the -m directive specified for the cpu.
104 unsigned getDarwinDirective() const { return DarwinDirective; }
106 /// getInstrItins - Return the instruction itineraies based on subtarget
108 const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
110 /// getTargetDataString - Return the pointer size and type alignment
111 /// properties of this subtarget.
112 const char *getTargetDataString() const {
113 // Note, the alignment values for f64 and i64 on ppc64 in Darwin
114 // documentation are wrong; these are correct (i.e. "what gcc does").
115 return isPPC64() ? "E-p:64:64-f64:64:64-i64:64:64-f128:64:128"
116 : "E-p:32:32-f64:32:64-i64:32:64-f128:64:128";
119 /// isPPC64 - Return true if we are generating code for 64-bit pointer mode.
121 bool isPPC64() const { return IsPPC64; }
123 /// has64BitSupport - Return true if the selected CPU supports 64-bit
124 /// instructions, regardless of whether we are in 32-bit or 64-bit mode.
125 bool has64BitSupport() const { return Has64BitSupport; }
127 /// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit
128 /// registers in 32-bit mode when possible. This can only true if
129 /// has64BitSupport() returns true.
130 bool use64BitRegs() const { return Use64BitRegs; }
132 /// hasLazyResolverStub - Return true if accesses to the specified global have
133 /// to go through a dyld lazy resolution stub. This means that an extra load
134 /// is required to get the address of the global.
135 bool hasLazyResolverStub(const GlobalValue *GV) const;
137 // Specific obvious features.
138 bool hasFSQRT() const { return HasFSQRT; }
139 bool hasSTFIWX() const { return HasSTFIWX; }
140 bool hasAltivec() const { return HasAltivec; }
141 bool isGigaProcessor() const { return IsGigaProcessor; }
143 /// isDarwin - True if this is any darwin platform.
144 bool isDarwin() const { return DarwinVers != 0; }
145 /// isDarwin - True if this is darwin9 (leopard, 10.5) or above.
146 bool isDarwin9() const { return DarwinVers >= 9; }
148 /// getDarwinVers - Return the darwin version number, 8 = tiger, 9 = leopard.
149 unsigned getDarwinVers() const { return DarwinVers; }
151 bool isDarwinABI() const { return isDarwin() || IsPPC64; }
152 bool isSVR4ABI() const { return !isDarwin() && !IsPPC64; }
154 unsigned getAsmFlavor() const {
155 return AsmFlavor != Unset ? unsigned(AsmFlavor) : 0;
158 } // End llvm namespace