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/IntrinsicLowering.h"
19 #include "llvm/CodeGen/MachineFunction.h"
20 #include "llvm/CodeGen/Passes.h"
21 #include "llvm/Target/TargetOptions.h"
22 #include "llvm/Target/TargetMachineRegistry.h"
23 #include "llvm/Transforms/Scalar.h"
24 #include "llvm/Support/CommandLine.h"
25 #include "llvm/ADT/Statistic.h"
29 /// X86TargetMachineModule - Note that this is used on hosts that cannot link
30 /// in a library unless there are references into the library. In particular,
31 /// it seems that it is not possible to get things to work on Win32 without
32 /// this. Though it is unused, do not remove it.
33 extern "C" int X86TargetMachineModule;
34 int X86TargetMachineModule = 0;
37 cl::opt<bool> DisableOutput("disable-x86-llc-output", cl::Hidden,
38 cl::desc("Disable the X86 asm printer, for use "
39 "when profiling the code generator."));
40 // Register the target.
41 RegisterTarget<X86TargetMachine> X("x86", " IA-32 (Pentium and above)");
44 unsigned X86TargetMachine::getJITMatchQuality() {
45 #if defined(i386) || defined(__i386__) || defined(__x86__) || defined(_M_IX86)
52 unsigned X86TargetMachine::getModuleMatchQuality(const Module &M) {
53 // We strongly match "i[3-9]86-*".
54 std::string TT = M.getTargetTriple();
55 if (TT.size() >= 5 && TT[0] == 'i' && TT[2] == '8' && TT[3] == '6' &&
56 TT[4] == '-' && TT[1] - '3' < 6)
59 if (M.getEndianness() == Module::LittleEndian &&
60 M.getPointerSize() == Module::Pointer32)
61 return 10; // Weak match
62 else if (M.getEndianness() != Module::AnyEndianness ||
63 M.getPointerSize() != Module::AnyPointerSize)
64 return 0; // Match for some other target
66 return getJITMatchQuality()/2;
69 /// X86TargetMachine ctor - Create an ILP32 architecture model
71 X86TargetMachine::X86TargetMachine(const Module &M,
72 IntrinsicLowering *IL,
73 const std::string &FS)
74 : TargetMachine("X86", IL, true, 4, 4, 4, 4, 4),
76 FrameInfo(TargetFrameInfo::StackGrowsDown,
77 Subtarget.getStackAlignment(), -4),
82 // addPassesToEmitFile - We currently use all of the same passes as the JIT
83 // does to emit statically compiled machine code.
84 bool X86TargetMachine::addPassesToEmitFile(PassManager &PM, std::ostream &Out,
85 CodeGenFileType FileType,
87 if (FileType != TargetMachine::AssemblyFile &&
88 FileType != TargetMachine::ObjectFile) return true;
90 // FIXME: Implement efficient support for garbage collection intrinsics.
91 PM.add(createLowerGCPass());
93 // FIXME: Implement the invoke/unwind instructions!
94 PM.add(createLowerInvokePass());
96 // FIXME: Implement the switch instruction in the instruction selector!
97 PM.add(createLowerSwitchPass());
99 // Make sure that no unreachable blocks are instruction selected.
100 PM.add(createUnreachableBlockEliminationPass());
102 // Install an instruction selector.
103 PM.add(createX86ISelDag(*this));
105 // Print the instruction selected machine code...
106 if (PrintMachineCode)
107 PM.add(createMachineFunctionPrinterPass(&std::cerr));
109 // Perform register allocation to convert to a concrete x86 representation
110 PM.add(createRegisterAllocator());
112 if (PrintMachineCode)
113 PM.add(createMachineFunctionPrinterPass(&std::cerr));
115 PM.add(createX86FloatingPointStackifierPass());
117 if (PrintMachineCode)
118 PM.add(createMachineFunctionPrinterPass(&std::cerr));
120 // Insert prolog/epilog code. Eliminate abstract frame index references...
121 PM.add(createPrologEpilogCodeInserter());
123 if (PrintMachineCode) // Print the register-allocated code
124 PM.add(createX86CodePrinterPass(std::cerr, *this));
129 assert(0 && "Unexpected filetype here!");
130 case TargetMachine::AssemblyFile:
131 PM.add(createX86CodePrinterPass(Out, *this));
133 case TargetMachine::ObjectFile:
134 // FIXME: We only support emission of ELF files for now, this should check
135 // the target triple and decide on the format to write (e.g. COFF on
137 addX86ELFObjectWriterPass(PM, Out, *this);
141 // Delete machine code for this function
142 PM.add(createMachineCodeDeleter());
144 return false; // success!
147 /// addPassesToJITCompile - Add passes to the specified pass manager to
148 /// implement a fast dynamic compiler for this target. Return true if this is
149 /// not supported for this target.
151 void X86JITInfo::addPassesToJITCompile(FunctionPassManager &PM) {
152 // The JIT does not support or need PIC.
155 // FIXME: Implement efficient support for garbage collection intrinsics.
156 PM.add(createLowerGCPass());
158 // FIXME: Implement the invoke/unwind instructions!
159 PM.add(createLowerInvokePass());
161 // FIXME: Implement the switch instruction in the instruction selector!
162 PM.add(createLowerSwitchPass());
164 // Make sure that no unreachable blocks are instruction selected.
165 PM.add(createUnreachableBlockEliminationPass());
167 // Install an instruction selector.
168 PM.add(createX86ISelDag(TM));
170 // Print the instruction selected machine code...
171 if (PrintMachineCode)
172 PM.add(createMachineFunctionPrinterPass(&std::cerr));
174 // Perform register allocation to convert to a concrete x86 representation
175 PM.add(createRegisterAllocator());
177 if (PrintMachineCode)
178 PM.add(createMachineFunctionPrinterPass(&std::cerr));
180 PM.add(createX86FloatingPointStackifierPass());
182 if (PrintMachineCode)
183 PM.add(createMachineFunctionPrinterPass(&std::cerr));
185 // Insert prolog/epilog code. Eliminate abstract frame index references...
186 PM.add(createPrologEpilogCodeInserter());
188 if (PrintMachineCode) // Print the register-allocated code
189 PM.add(createX86CodePrinterPass(std::cerr, TM));
192 bool X86TargetMachine::addPassesToEmitMachineCode(FunctionPassManager &PM,
193 MachineCodeEmitter &MCE) {
194 PM.add(createX86CodeEmitterPass(MCE));
195 // Delete machine code for this function
196 PM.add(createMachineCodeDeleter());