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/ADT/Triple.h"
18 #include "llvm/Target/TargetInstrItineraries.h"
19 #include "llvm/Target/TargetSubtarget.h"
23 // GCC #defines PPC on Linux but we use it as our namespace name
29 // -m directive values.
46 class PPCSubtarget : public TargetSubtarget {
48 /// stackAlignment - The minimum alignment known to hold of the stack frame on
49 /// entry to the function and which must be maintained by every function.
50 unsigned StackAlignment;
52 /// Selected instruction itineraries (one entry per itinerary class.)
53 InstrItineraryData InstrItins;
55 /// Which cpu directive was used.
56 unsigned DarwinDirective;
58 /// Used by the ISel to turn in optimizations for POWER4-derived architectures
66 bool HasLazyResolverStubs;
69 /// TargetTriple - What processor and OS we're targeting.
73 /// This constructor initializes the data members to match that
74 /// of the specified triple.
76 PPCSubtarget(const std::string &TT, const std::string &FS, bool is64Bit);
78 /// ParseSubtargetFeatures - Parses features string setting specified
79 /// subtarget options. Definition of function is auto generated by tblgen.
80 std::string ParseSubtargetFeatures(const std::string &FS,
81 const std::string &CPU);
84 /// SetJITMode - This is called to inform the subtarget info that we are
85 /// producing code for the JIT.
88 /// getStackAlignment - Returns the minimum alignment known to hold of the
89 /// stack frame on entry to the function and which must be maintained by every
90 /// function for this subtarget.
91 unsigned getStackAlignment() const { return StackAlignment; }
93 /// getDarwinDirective - Returns the -m directive specified for the cpu.
95 unsigned getDarwinDirective() const { return DarwinDirective; }
97 /// getInstrItins - Return the instruction itineraies based on subtarget
99 const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
101 /// getTargetDataString - Return the pointer size and type alignment
102 /// properties of this subtarget.
103 const char *getTargetDataString() const {
104 // Note, the alignment values for f64 and i64 on ppc64 in Darwin
105 // documentation are wrong; these are correct (i.e. "what gcc does").
106 return isPPC64() ? "E-p:64:64-f64:64:64-i64:64:64-f128:64:128-n32:64"
107 : "E-p:32:32-f64:32:64-i64:32:64-f128:64:128-n32";
110 /// isPPC64 - Return true if we are generating code for 64-bit pointer mode.
112 bool isPPC64() const { return IsPPC64; }
114 /// has64BitSupport - Return true if the selected CPU supports 64-bit
115 /// instructions, regardless of whether we are in 32-bit or 64-bit mode.
116 bool has64BitSupport() const { return Has64BitSupport; }
118 /// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit
119 /// registers in 32-bit mode when possible. This can only true if
120 /// has64BitSupport() returns true.
121 bool use64BitRegs() const { return Use64BitRegs; }
123 /// hasLazyResolverStub - Return true if accesses to the specified global have
124 /// to go through a dyld lazy resolution stub. This means that an extra load
125 /// is required to get the address of the global.
126 bool hasLazyResolverStub(const GlobalValue *GV,
127 const TargetMachine &TM) const;
129 // isJITCodeModel - True if we're generating code for the JIT
130 bool isJITCodeModel() const { return IsJITCodeModel; }
132 // Specific obvious features.
133 bool hasFSQRT() const { return HasFSQRT; }
134 bool hasSTFIWX() const { return HasSTFIWX; }
135 bool hasAltivec() const { return HasAltivec; }
136 bool isGigaProcessor() const { return IsGigaProcessor; }
138 const Triple &getTargetTriple() const { return TargetTriple; }
140 /// isDarwin - True if this is any darwin platform.
141 bool isDarwin() const { return TargetTriple.isOSX(); }
143 bool isDarwinABI() const { return isDarwin(); }
144 bool isSVR4ABI() const { return !isDarwin(); }
147 } // End llvm namespace