1 //===-- X86TargetMachine.cpp - Define TargetMachine for the X86 -----------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the X86 specific subclass of TargetMachine.
12 //===----------------------------------------------------------------------===//
14 #include "X86TargetMachine.h"
16 #include "llvm/Module.h"
17 #include "llvm/PassManager.h"
18 #include "llvm/CodeGen/MachineFunction.h"
19 #include "llvm/CodeGen/Passes.h"
20 #include "llvm/Target/TargetOptions.h"
21 #include "llvm/Target/TargetMachineRegistry.h"
22 #include "llvm/Transforms/Scalar.h"
23 #include "llvm/Support/CommandLine.h"
24 #include "llvm/ADT/Statistic.h"
28 /// X86TargetMachineModule - Note that this is used on hosts that cannot link
29 /// in a library unless there are references into the library. In particular,
30 /// it seems that it is not possible to get things to work on Win32 without
31 /// this. Though it is unused, do not remove it.
32 extern "C" int X86TargetMachineModule;
33 int X86TargetMachineModule = 0;
36 cl::opt<bool> DisableOutput("disable-x86-llc-output", cl::Hidden,
37 cl::desc("Disable the X86 asm printer, for use "
38 "when profiling the code generator."));
39 // Register the target.
40 RegisterTarget<X86TargetMachine> X("x86", " IA-32 (Pentium and above)");
43 unsigned X86TargetMachine::getJITMatchQuality() {
44 #if defined(i386) || defined(__i386__) || defined(__x86__) || defined(_M_IX86)
51 unsigned X86TargetMachine::getModuleMatchQuality(const Module &M) {
52 // We strongly match "i[3-9]86-*".
53 std::string TT = M.getTargetTriple();
54 if (TT.size() >= 5 && TT[0] == 'i' && TT[2] == '8' && TT[3] == '6' &&
55 TT[4] == '-' && TT[1] - '3' < 6)
58 if (M.getEndianness() == Module::LittleEndian &&
59 M.getPointerSize() == Module::Pointer32)
60 return 10; // Weak match
61 else if (M.getEndianness() != Module::AnyEndianness ||
62 M.getPointerSize() != Module::AnyPointerSize)
63 return 0; // Match for some other target
65 return getJITMatchQuality()/2;
68 /// X86TargetMachine ctor - Create an ILP32 architecture model
70 X86TargetMachine::X86TargetMachine(const Module &M, const std::string &FS)
71 : Subtarget(M, FS), DataLayout("e-p:32:32-d:32-l:32"),
72 FrameInfo(TargetFrameInfo::StackGrowsDown,
73 Subtarget.getStackAlignment(), -4),
74 InstrInfo(*this), JITInfo(*this), TLInfo(*this) {
75 if (getRelocationModel() == Reloc::Default)
76 if (Subtarget.isTargetDarwin())
77 setRelocationModel(Reloc::DynamicNoPIC);
79 setRelocationModel(Reloc::PIC_);
83 // addPassesToEmitFile - We currently use all of the same passes as the JIT
84 // does to emit statically compiled machine code.
85 bool X86TargetMachine::addPassesToEmitFile(PassManager &PM, std::ostream &Out,
86 CodeGenFileType FileType,
88 if (FileType != TargetMachine::AssemblyFile &&
89 FileType != TargetMachine::ObjectFile) return true;
91 // Run loop strength reduction before anything else.
92 if (!Fast) PM.add(createLoopStrengthReducePass(&TLInfo));
94 // FIXME: Implement efficient support for garbage collection intrinsics.
95 PM.add(createLowerGCPass());
97 // FIXME: Implement the invoke/unwind instructions!
98 PM.add(createLowerInvokePass());
100 // Make sure that no unreachable blocks are instruction selected.
101 PM.add(createUnreachableBlockEliminationPass());
103 // Install an instruction selector.
104 PM.add(createX86ISelDag(*this, Fast));
106 // Print the instruction selected machine code...
107 if (PrintMachineCode)
108 PM.add(createMachineFunctionPrinterPass(&std::cerr));
110 // Perform register allocation to convert to a concrete x86 representation
111 PM.add(createRegisterAllocator());
113 if (PrintMachineCode)
114 PM.add(createMachineFunctionPrinterPass(&std::cerr));
116 PM.add(createX86FloatingPointStackifierPass());
118 if (PrintMachineCode)
119 PM.add(createMachineFunctionPrinterPass(&std::cerr));
121 // Insert prolog/epilog code. Eliminate abstract frame index references...
122 PM.add(createPrologEpilogCodeInserter());
124 if (PrintMachineCode) // Print the register-allocated code
125 PM.add(createX86CodePrinterPass(std::cerr, *this));
130 assert(0 && "Unexpected filetype here!");
131 case TargetMachine::AssemblyFile:
132 PM.add(createX86CodePrinterPass(Out, *this));
134 case TargetMachine::ObjectFile:
135 // FIXME: We only support emission of ELF files for now, this should check
136 // the target triple and decide on the format to write (e.g. COFF on
137 // win32 or Mach-O on darwin).
138 addX86ELFObjectWriterPass(PM, Out, *this);
142 // Delete machine code for this function
143 PM.add(createMachineCodeDeleter());
145 return false; // success!
148 /// addPassesToJITCompile - Add passes to the specified pass manager to
149 /// implement a fast dynamic compiler for this target. Return true if this is
150 /// not supported for this target.
152 void X86JITInfo::addPassesToJITCompile(FunctionPassManager &PM) {
153 // The JIT should use static relocation model.
154 TM.setRelocationModel(Reloc::Static);
156 // Run loop strength reduction before anything else.
157 PM.add(createLoopStrengthReducePass(TM.getTargetLowering()));
159 // FIXME: Implement efficient support for garbage collection intrinsics.
160 PM.add(createLowerGCPass());
162 // FIXME: Implement the invoke/unwind instructions!
163 PM.add(createLowerInvokePass());
165 // Make sure that no unreachable blocks are instruction selected.
166 PM.add(createUnreachableBlockEliminationPass());
168 // Install an instruction selector.
169 PM.add(createX86ISelDag(TM, false));
171 // Print the instruction selected machine code...
172 if (PrintMachineCode)
173 PM.add(createMachineFunctionPrinterPass(&std::cerr));
175 // Perform register allocation to convert to a concrete x86 representation
176 PM.add(createRegisterAllocator());
178 if (PrintMachineCode)
179 PM.add(createMachineFunctionPrinterPass(&std::cerr));
181 PM.add(createX86FloatingPointStackifierPass());
183 if (PrintMachineCode)
184 PM.add(createMachineFunctionPrinterPass(&std::cerr));
186 // Insert prolog/epilog code. Eliminate abstract frame index references...
187 PM.add(createPrologEpilogCodeInserter());
189 if (PrintMachineCode) // Print the register-allocated code
190 PM.add(createX86CodePrinterPass(std::cerr, TM));
193 bool X86TargetMachine::addPassesToEmitMachineCode(FunctionPassManager &PM,
194 MachineCodeEmitter &MCE) {
195 PM.add(createX86CodeEmitterPass(*this, MCE));
196 // Delete machine code for this function
197 PM.add(createMachineCodeDeleter());