1 //===-- ARMTargetMachine.cpp - Define TargetMachine for ARM ---------------===//
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 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "ARMTargetMachine.h"
14 #include "ARMMCAsmInfo.h"
15 #include "ARMFrameInfo.h"
16 #include "ARM.h"
17 #include "llvm/PassManager.h"
18 #include "llvm/CodeGen/Passes.h"
19 #include "llvm/Support/FormattedStream.h"
20 #include "llvm/Target/TargetOptions.h"
21 #include "llvm/Target/TargetRegistry.h"
22 using namespace llvm;
23 
24 static MCAsmInfo *createMCAsmInfo(const Target &T, StringRef TT) {
25   Triple TheTriple(TT);
26   switch (TheTriple.getOS()) {
27   case Triple::Darwin:
28     return new ARMMCAsmInfoDarwin();
29   default:
30     return new ARMELFMCAsmInfo();
31   }
32 }
33 
34 
35 extern "C" void LLVMInitializeARMTarget() {
36   // Register the target.
37   RegisterTargetMachine<ARMTargetMachine> X(TheARMTarget);
38   RegisterTargetMachine<ThumbTargetMachine> Y(TheThumbTarget);
39 
40   // Register the target asm info.
41   RegisterAsmInfoFn A(TheARMTarget, createMCAsmInfo);
42   RegisterAsmInfoFn B(TheThumbTarget, createMCAsmInfo);
43 }
44 
45 /// TargetMachine ctor - Create an ARM architecture model.
46 ///
47 ARMBaseTargetMachine::ARMBaseTargetMachine(const Target &T,
48                                            const std::string &TT,
49                                            const std::string &FS,
50                                            bool isThumb)
51   : LLVMTargetMachine(T, TT),
52     Subtarget(TT, FS, isThumb),
53     FrameInfo(Subtarget),
54     JITInfo(),
55     InstrItins(Subtarget.getInstrItineraryData()) {
56   DefRelocModel = getRelocationModel();
57 }
58 
59 ARMTargetMachine::ARMTargetMachine(const Target &T, const std::string &TT,
60                                    const std::string &FS)
61   : ARMBaseTargetMachine(T, TT, FS, false), InstrInfo(Subtarget),
62     DataLayout(Subtarget.isAPCS_ABI() ?
63                std::string("e-p:32:32-f64:32:32-i64:32:32-n32") :
64                std::string("e-p:32:32-f64:64:64-i64:64:64-n32")),
65     TLInfo(*this) {
66 }
67 
68 ThumbTargetMachine::ThumbTargetMachine(const Target &T, const std::string &TT,
69                                        const std::string &FS)
70   : ARMBaseTargetMachine(T, TT, FS, true),
71     InstrInfo(Subtarget.hasThumb2()
72               ? ((ARMBaseInstrInfo*)new Thumb2InstrInfo(Subtarget))
73               : ((ARMBaseInstrInfo*)new Thumb1InstrInfo(Subtarget))),
74     DataLayout(Subtarget.isAPCS_ABI() ?
75                std::string("e-p:32:32-f64:32:32-i64:32:32-"
76                            "i16:16:32-i8:8:32-i1:8:32-a:0:32-n32") :
77                std::string("e-p:32:32-f64:64:64-i64:64:64-"
78                            "i16:16:32-i8:8:32-i1:8:32-a:0:32-n32")),
79     TLInfo(*this) {
80 }
81 
82 
83 
84 // Pass Pipeline Configuration
85 bool ARMBaseTargetMachine::addInstSelector(PassManagerBase &PM,
86                                            CodeGenOpt::Level OptLevel) {
87   PM.add(createARMISelDag(*this, OptLevel));
88   return false;
89 }
90 
91 bool ARMBaseTargetMachine::addPreRegAlloc(PassManagerBase &PM,
92                                           CodeGenOpt::Level OptLevel) {
93   if (Subtarget.hasNEON())
94     PM.add(createNEONPreAllocPass());
95 
96   // FIXME: temporarily disabling load / store optimization pass for Thumb1.
97   if (OptLevel != CodeGenOpt::None && !Subtarget.isThumb1Only())
98     PM.add(createARMLoadStoreOptimizationPass(true));
99   return true;
100 }
101 
102 bool ARMBaseTargetMachine::addPreSched2(PassManagerBase &PM,
103                                         CodeGenOpt::Level OptLevel) {
104   // FIXME: temporarily disabling load / store optimization pass for Thumb1.
105   if (OptLevel != CodeGenOpt::None) {
106     if (!Subtarget.isThumb1Only())
107       PM.add(createARMLoadStoreOptimizationPass());
108     if (Subtarget.hasNEON())
109       PM.add(createNEONMoveFixPass());
110   }
111 
112   // Expand some pseudo instructions into multiple instructions to allow
113   // proper scheduling.
114   PM.add(createARMExpandPseudoPass());
115 
116   return true;
117 }
118 
119 bool ARMBaseTargetMachine::addPreEmitPass(PassManagerBase &PM,
120                                           CodeGenOpt::Level OptLevel) {
121   // FIXME: temporarily disabling load / store optimization pass for Thumb1.
122   if (OptLevel != CodeGenOpt::None) {
123     if (!Subtarget.isThumb1Only())
124       PM.add(createIfConverterPass());
125   }
126 
127   if (Subtarget.isThumb2()) {
128     PM.add(createThumb2ITBlockPass());
129     PM.add(createThumb2SizeReductionPass());
130   }
131 
132   PM.add(createARMConstantIslandPass());
133   return true;
134 }
135 
136 bool ARMBaseTargetMachine::addCodeEmitter(PassManagerBase &PM,
137                                           CodeGenOpt::Level OptLevel,
138                                           JITCodeEmitter &JCE) {
139   // FIXME: Move this to TargetJITInfo!
140   if (DefRelocModel == Reloc::Default)
141     setRelocationModel(Reloc::Static);
142 
143   // Machine code emitter pass for ARM.
144   PM.add(createARMJITCodeEmitterPass(*this, JCE));
145   return false;
146 }
147