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.
45 class PPCSubtarget : public TargetSubtarget {
47 enum AsmWriterFlavorTy {
48 OldMnemonic, NewMnemonic, Unset
51 /// stackAlignment - The minimum alignment known to hold of the stack frame on
52 /// entry to the function and which must be maintained by every function.
53 unsigned StackAlignment;
55 /// Selected instruction itineraries (one entry per itinerary class.)
56 InstrItineraryData InstrItins;
58 /// Which cpu directive was used.
59 unsigned DarwinDirective;
61 /// AsmFlavor - Which PPC asm dialect to use.
62 AsmWriterFlavorTy AsmFlavor;
64 /// Used by the ISel to turn in optimizations for POWER4-derived architectures
72 bool HasLazyResolverStubs;
74 /// DarwinVers - Nonzero if this is a darwin platform. Otherwise, the numeric
75 /// version of the platform, e.g. 8 = 10.4 (Tiger), 9 = 10.5 (Leopard), etc.
76 unsigned char DarwinVers; // Is any darwin-ppc platform.
78 /// This constructor initializes the data members to match that
79 /// of the specified triple.
81 PPCSubtarget(const std::string &TT, const std::string &FS, bool is64Bit);
83 /// ParseSubtargetFeatures - Parses features string setting specified
84 /// subtarget options. Definition of function is auto generated by tblgen.
85 std::string ParseSubtargetFeatures(const std::string &FS,
86 const std::string &CPU);
89 /// SetJITMode - This is called to inform the subtarget info that we are
90 /// producing code for the JIT.
93 /// getStackAlignment - Returns the minimum alignment known to hold of the
94 /// stack frame on entry to the function and which must be maintained by every
95 /// function for this subtarget.
96 unsigned getStackAlignment() const { return StackAlignment; }
98 /// getDarwinDirective - Returns the -m directive specified for the cpu.
100 unsigned getDarwinDirective() const { return DarwinDirective; }
102 /// getInstrItins - Return the instruction itineraies based on subtarget
104 const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
106 /// getTargetDataString - Return the pointer size and type alignment
107 /// properties of this subtarget.
108 const char *getTargetDataString() const {
109 // Note, the alignment values for f64 and i64 on ppc64 in Darwin
110 // documentation are wrong; these are correct (i.e. "what gcc does").
111 return isPPC64() ? "E-p:64:64-f64:64:64-i64:64:64-f128:64:128"
112 : "E-p:32:32-f64:32:64-i64:32:64-f128:64:128";
115 /// isPPC64 - Return true if we are generating code for 64-bit pointer mode.
117 bool isPPC64() const { return IsPPC64; }
119 /// has64BitSupport - Return true if the selected CPU supports 64-bit
120 /// instructions, regardless of whether we are in 32-bit or 64-bit mode.
121 bool has64BitSupport() const { return Has64BitSupport; }
123 /// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit
124 /// registers in 32-bit mode when possible. This can only true if
125 /// has64BitSupport() returns true.
126 bool use64BitRegs() const { return Use64BitRegs; }
128 /// hasLazyResolverStub - Return true if accesses to the specified global have
129 /// to go through a dyld lazy resolution stub. This means that an extra load
130 /// is required to get the address of the global.
131 bool hasLazyResolverStub(const GlobalValue *GV,
132 const TargetMachine &TM) const;
134 // Specific obvious features.
135 bool hasFSQRT() const { return HasFSQRT; }
136 bool hasSTFIWX() const { return HasSTFIWX; }
137 bool hasAltivec() const { return HasAltivec; }
138 bool isGigaProcessor() const { return IsGigaProcessor; }
140 /// isDarwin - True if this is any darwin platform.
141 bool isDarwin() const { return DarwinVers != 0; }
142 /// isDarwin - True if this is darwin9 (leopard, 10.5) or above.
143 bool isDarwin9() const { return DarwinVers >= 9; }
145 /// getDarwinVers - Return the darwin version number, 8 = tiger, 9 = leopard.
146 unsigned getDarwinVers() const { return DarwinVers; }
148 bool isDarwinABI() const { return isDarwin() || IsPPC64; }
149 bool isSVR4ABI() const { return !isDarwin() && !IsPPC64; }
151 unsigned getAsmFlavor() const {
152 return AsmFlavor != Unset ? unsigned(AsmFlavor) : 0;
155 } // End llvm namespace