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 const TargetMachine &TM;
53 /// stackAlignment - The minimum alignment known to hold of the stack frame on
54 /// entry to the function and which must be maintained by every function.
55 unsigned StackAlignment;
57 /// Selected instruction itineraries (one entry per itinerary class.)
58 InstrItineraryData InstrItins;
60 /// Which cpu directive was used.
61 unsigned DarwinDirective;
63 /// AsmFlavor - Which PPC asm dialect to use.
64 AsmWriterFlavorTy AsmFlavor;
66 /// Used by the ISel to turn in optimizations for POWER4-derived architectures
75 bool HasLazyResolverStubs;
77 /// This constructor initializes the data members to match that
78 /// of the specified module.
80 PPCSubtarget(const TargetMachine &TM, const Module &M,
81 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 void ParseSubtargetFeatures(const std::string &FS, const std::string &CPU);
87 /// SetJITMode - This is called to inform the subtarget info that we are
88 /// producing code for the JIT.
91 /// getStackAlignment - Returns the minimum alignment known to hold of the
92 /// stack frame on entry to the function and which must be maintained by every
93 /// function for this subtarget.
94 unsigned getStackAlignment() const { return StackAlignment; }
96 /// getDarwinDirective - Returns the -m directive specified for the cpu.
98 unsigned getDarwinDirective() const { return DarwinDirective; }
100 /// getInstrItins - Return the instruction itineraies based on subtarget
102 const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
104 /// getTargetDataString - Return the pointer size and type alignment
105 /// properties of this subtarget.
106 const char *getTargetDataString() const {
107 return isPPC64() ? "E-p:64:64-f64:32:64-i64:32:64-f128:64:128"
108 : "E-p:32:32-f64:32:64-i64:32:64-f128:64:128";
111 /// isPPC64 - Return true if we are generating code for 64-bit pointer mode.
113 bool isPPC64() const { return IsPPC64; }
115 /// has64BitSupport - Return true if the selected CPU supports 64-bit
116 /// instructions, regardless of whether we are in 32-bit or 64-bit mode.
117 bool has64BitSupport() const { return Has64BitSupport; }
119 /// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit
120 /// registers in 32-bit mode when possible. This can only true if
121 /// has64BitSupport() returns true.
122 bool use64BitRegs() const { return Use64BitRegs; }
124 /// hasLazyResolverStub - Return true if accesses to the specified global have
125 /// to go through a dyld lazy resolution stub. This means that an extra load
126 /// is required to get the address of the global.
127 bool hasLazyResolverStub(const GlobalValue *GV) const;
129 // Specific obvious features.
130 bool hasFSQRT() const { return HasFSQRT; }
131 bool hasSTFIWX() const { return HasSTFIWX; }
132 bool hasAltivec() const { return HasAltivec; }
133 bool isGigaProcessor() const { return IsGigaProcessor; }
135 bool isDarwin() const { return IsDarwin; }
137 bool isMachoABI() const { return IsDarwin || IsPPC64; }
138 bool isELF32_ABI() const { return !IsDarwin && !IsPPC64; }
140 unsigned getAsmFlavor() const {
141 return AsmFlavor != Unset ? unsigned(AsmFlavor) : 0;
144 } // End llvm namespace