Added TargetPassConfig. The first little step toward configuring codegen passes.
[oota-llvm.git] / lib / Target / X86 / X86TargetMachine.cpp
1 //===-- X86TargetMachine.cpp - Define TargetMachine for the X86 -----------===//
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 // This file defines the X86 specific subclass of TargetMachine.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "X86TargetMachine.h"
15 #include "X86.h"
16 #include "llvm/PassManager.h"
17 #include "llvm/CodeGen/MachineFunction.h"
18 #include "llvm/CodeGen/Passes.h"
19 #include "llvm/Support/CommandLine.h"
20 #include "llvm/Support/FormattedStream.h"
21 #include "llvm/Target/TargetOptions.h"
22 #include "llvm/Support/TargetRegistry.h"
23 using namespace llvm;
24
25 extern "C" void LLVMInitializeX86Target() {
26   // Register the target.
27   RegisterTargetMachine<X86_32TargetMachine> X(TheX86_32Target);
28   RegisterTargetMachine<X86_64TargetMachine> Y(TheX86_64Target);
29 }
30
31 void X86_32TargetMachine::anchor() { }
32
33 X86_32TargetMachine::X86_32TargetMachine(const Target &T, StringRef TT,
34                                          StringRef CPU, StringRef FS,
35                                          const TargetOptions &Options,
36                                          Reloc::Model RM, CodeModel::Model CM,
37                                          CodeGenOpt::Level OL)
38   : X86TargetMachine(T, TT, CPU, FS, Options, RM, CM, OL, false),
39     DataLayout(getSubtargetImpl()->isTargetDarwin() ?
40                "e-p:32:32-f64:32:64-i64:32:64-f80:128:128-f128:128:128-"
41                "n8:16:32-S128" :
42                (getSubtargetImpl()->isTargetCygMing() ||
43                 getSubtargetImpl()->isTargetWindows()) ?
44                "e-p:32:32-f64:64:64-i64:64:64-f80:32:32-f128:128:128-"
45                "n8:16:32-S32" :
46                "e-p:32:32-f64:32:64-i64:32:64-f80:32:32-f128:128:128-"
47                "n8:16:32-S128"),
48     InstrInfo(*this),
49     TSInfo(*this),
50     TLInfo(*this),
51     JITInfo(*this) {
52 }
53
54 void X86_64TargetMachine::anchor() { }
55
56 X86_64TargetMachine::X86_64TargetMachine(const Target &T, StringRef TT,
57                                          StringRef CPU, StringRef FS,
58                                          const TargetOptions &Options,
59                                          Reloc::Model RM, CodeModel::Model CM,
60                                          CodeGenOpt::Level OL)
61   : X86TargetMachine(T, TT, CPU, FS, Options, RM, CM, OL, true),
62     DataLayout("e-p:64:64-s:64-f64:64:64-i64:64:64-f80:128:128-f128:128:128-"
63                "n8:16:32:64-S128"),
64     InstrInfo(*this),
65     TSInfo(*this),
66     TLInfo(*this),
67     JITInfo(*this) {
68 }
69
70 /// X86TargetMachine ctor - Create an X86 target.
71 ///
72 X86TargetMachine::X86TargetMachine(const Target &T, StringRef TT,
73                                    StringRef CPU, StringRef FS,
74                                    const TargetOptions &Options,
75                                    Reloc::Model RM, CodeModel::Model CM,
76                                    CodeGenOpt::Level OL,
77                                    bool is64Bit)
78   : LLVMTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL),
79     Subtarget(TT, CPU, FS, Options.StackAlignmentOverride, is64Bit),
80     FrameLowering(*this, Subtarget),
81     ELFWriterInfo(is64Bit, true),
82     InstrItins(Subtarget.getInstrItineraryData()){
83   // Determine the PICStyle based on the target selected.
84   if (getRelocationModel() == Reloc::Static) {
85     // Unless we're in PIC or DynamicNoPIC mode, set the PIC style to None.
86     Subtarget.setPICStyle(PICStyles::None);
87   } else if (Subtarget.is64Bit()) {
88     // PIC in 64 bit mode is always rip-rel.
89     Subtarget.setPICStyle(PICStyles::RIPRel);
90   } else if (Subtarget.isTargetCygMing()) {
91     Subtarget.setPICStyle(PICStyles::None);
92   } else if (Subtarget.isTargetDarwin()) {
93     if (getRelocationModel() == Reloc::PIC_)
94       Subtarget.setPICStyle(PICStyles::StubPIC);
95     else {
96       assert(getRelocationModel() == Reloc::DynamicNoPIC);
97       Subtarget.setPICStyle(PICStyles::StubDynamicNoPIC);
98     }
99   } else if (Subtarget.isTargetELF()) {
100     Subtarget.setPICStyle(PICStyles::GOT);
101   }
102
103   // default to hard float ABI
104   if (Options.FloatABIType == FloatABI::Default)
105     this->Options.FloatABIType = FloatABI::Hard;
106 }
107
108 //===----------------------------------------------------------------------===//
109 // Command line options for x86
110 //===----------------------------------------------------------------------===//
111 static cl::opt<bool>
112 UseVZeroUpper("x86-use-vzeroupper",
113   cl::desc("Minimize AVX to SSE transition penalty"),
114   cl::init(true));
115
116 //===----------------------------------------------------------------------===//
117 // Pass Pipeline Configuration
118 //===----------------------------------------------------------------------===//
119
120 namespace {
121 /// X86 Code Generator Pass Configuration Options.
122 class X86PassConfig : public TargetPassConfig {
123 public:
124   X86PassConfig(X86TargetMachine *TM, PassManagerBase &PM,
125                 bool DisableVerifyFlag)
126     : TargetPassConfig(TM, PM, DisableVerifyFlag) {}
127
128   X86TargetMachine &getX86TargetMachine() const {
129     return getTM<X86TargetMachine>();
130   }
131
132   const X86Subtarget &getX86Subtarget() const {
133     return *getX86TargetMachine().getSubtargetImpl();
134   }
135
136   virtual bool addInstSelector();
137   virtual bool addPreRegAlloc();
138   virtual bool addPostRegAlloc();
139   virtual bool addPreEmitPass();
140 };
141 } // namespace
142
143 TargetPassConfig *X86TargetMachine::createPassConfig(PassManagerBase &PM,
144                                                      bool DisableVerify) {
145   return new X86PassConfig(this, PM, DisableVerify);
146 }
147
148 bool X86PassConfig::addInstSelector() {
149   // Install an instruction selector.
150   PM.add(createX86ISelDag(getX86TargetMachine(), getOptLevel()));
151
152   // For 32-bit, prepend instructions to set the "global base reg" for PIC.
153   if (!getX86Subtarget().is64Bit())
154     PM.add(createGlobalBaseRegPass());
155
156   return false;
157 }
158
159 bool X86PassConfig::addPreRegAlloc() {
160   PM.add(createX86MaxStackAlignmentHeuristicPass());
161   return false;  // -print-machineinstr shouldn't print after this.
162 }
163
164 bool X86PassConfig::addPostRegAlloc() {
165   PM.add(createX86FloatingPointStackifierPass());
166   return true;  // -print-machineinstr should print after this.
167 }
168
169 bool X86PassConfig::addPreEmitPass() {
170   bool ShouldPrint = false;
171   if (getOptLevel() != CodeGenOpt::None && getX86Subtarget().hasSSE2()) {
172     PM.add(createExecutionDependencyFixPass(&X86::VR128RegClass));
173     ShouldPrint = true;
174   }
175
176   if (getX86Subtarget().hasAVX() && UseVZeroUpper) {
177     PM.add(createX86IssueVZeroUpperPass());
178     ShouldPrint = true;
179   }
180
181   return ShouldPrint;
182 }
183
184 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
185                                       JITCodeEmitter &JCE) {
186   PM.add(createX86JITCodeEmitterPass(*this, JCE));
187
188   return false;
189 }