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626fb671c8
Implement the X86 Subtarget. This consolidates the checks for target triple, and setting options based on target triple into one place. This allows us to convert the asm printer and isel over from being littered with "forDarwin", "forCygwin", etc. into just having the appropriate flags for each subtarget feature controlling the code for that feature. This patch also implements indirect external and weak references in the X86 pattern isel, for darwin. Next up is to convert over the asm printers to use this new interface. llvm-svn: 22389
237 lines
8.3 KiB
C++
237 lines
8.3 KiB
C++
//===-- X86TargetMachine.cpp - Define TargetMachine for the X86 -----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the X86 specific subclass of TargetMachine.
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//
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//===----------------------------------------------------------------------===//
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#include "X86TargetMachine.h"
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#include "X86.h"
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#include "llvm/Module.h"
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#include "llvm/PassManager.h"
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#include "llvm/CodeGen/IntrinsicLowering.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/Target/TargetMachineRegistry.h"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/ADT/Statistic.h"
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using namespace llvm;
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X86VectorEnum llvm::X86Vector = NoSSE;
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bool llvm::X86ScalarSSE = false;
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/// X86TargetMachineModule - Note that this is used on hosts that cannot link
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/// in a library unless there are references into the library. In particular,
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/// it seems that it is not possible to get things to work on Win32 without
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/// this. Though it is unused, do not remove it.
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extern "C" int X86TargetMachineModule;
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int X86TargetMachineModule = 0;
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namespace {
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cl::opt<bool> NoSSAPeephole("disable-ssa-peephole", cl::init(true),
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cl::desc("Disable the ssa-based peephole optimizer "
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"(defaults to disabled)"));
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cl::opt<bool> DisableOutput("disable-x86-llc-output", cl::Hidden,
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cl::desc("Disable the X86 asm printer, for use "
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"when profiling the code generator."));
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cl::opt<bool, true> EnableSSEFP("enable-sse-scalar-fp",
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cl::desc("Perform FP math in SSE regs instead of the FP stack"),
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cl::location(X86ScalarSSE),
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cl::init(false));
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// FIXME: This should eventually be handled with target triples and
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// subtarget support!
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cl::opt<X86VectorEnum, true>
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SSEArg(
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cl::desc("Enable SSE support in the X86 target:"),
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cl::values(
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clEnumValN(SSE, "sse", " Enable SSE support"),
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clEnumValN(SSE2, "sse2", " Enable SSE and SSE2 support"),
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clEnumValN(SSE3, "sse3", " Enable SSE, SSE2, and SSE3 support"),
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clEnumValEnd),
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cl::location(X86Vector), cl::init(NoSSE));
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// Register the target.
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RegisterTarget<X86TargetMachine> X("x86", " IA-32 (Pentium and above)");
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}
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unsigned X86TargetMachine::getJITMatchQuality() {
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#if defined(i386) || defined(__i386__) || defined(__x86__) || defined(_M_IX86)
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return 10;
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#else
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return 0;
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#endif
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}
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unsigned X86TargetMachine::getModuleMatchQuality(const Module &M) {
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// We strongly match "i[3-9]86-*".
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std::string TT = M.getTargetTriple();
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if (TT.size() >= 5 && TT[0] == 'i' && TT[2] == '8' && TT[3] == '6' &&
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TT[4] == '-' && TT[1] - '3' < 6)
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return 20;
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if (M.getEndianness() == Module::LittleEndian &&
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M.getPointerSize() == Module::Pointer32)
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return 10; // Weak match
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else if (M.getEndianness() != Module::AnyEndianness ||
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M.getPointerSize() != Module::AnyPointerSize)
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return 0; // Match for some other target
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return getJITMatchQuality()/2;
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}
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/// X86TargetMachine ctor - Create an ILP32 architecture model
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///
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X86TargetMachine::X86TargetMachine(const Module &M, IntrinsicLowering *IL)
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: TargetMachine("X86", IL, true, 4, 4, 4, 4, 4),
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Subtarget(M),
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FrameInfo(TargetFrameInfo::StackGrowsDown,
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Subtarget.getStackAlignment(), -4),
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JITInfo(*this) {
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// Scalar SSE FP requires at least SSE2
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X86ScalarSSE &= X86Vector >= SSE2;
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}
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// addPassesToEmitFile - We currently use all of the same passes as the JIT
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// does to emit statically compiled machine code.
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bool X86TargetMachine::addPassesToEmitFile(PassManager &PM, std::ostream &Out,
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CodeGenFileType FileType) {
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if (FileType != TargetMachine::AssemblyFile &&
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FileType != TargetMachine::ObjectFile) return true;
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// FIXME: Implement efficient support for garbage collection intrinsics.
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PM.add(createLowerGCPass());
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// FIXME: Implement the invoke/unwind instructions!
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PM.add(createLowerInvokePass());
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// FIXME: Implement the switch instruction in the instruction selector!
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PM.add(createLowerSwitchPass());
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// Make sure that no unreachable blocks are instruction selected.
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PM.add(createUnreachableBlockEliminationPass());
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// Default to pattern ISel
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if (PatternISelTriState == 0)
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PM.add(createX86SimpleInstructionSelector(*this));
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else
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PM.add(createX86PatternInstructionSelector(*this));
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// Run optional SSA-based machine code optimizations next...
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if (!NoSSAPeephole)
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PM.add(createX86SSAPeepholeOptimizerPass());
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// Print the instruction selected machine code...
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if (PrintMachineCode)
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PM.add(createMachineFunctionPrinterPass(&std::cerr));
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// Perform register allocation to convert to a concrete x86 representation
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PM.add(createRegisterAllocator());
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if (PrintMachineCode)
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PM.add(createMachineFunctionPrinterPass(&std::cerr));
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PM.add(createX86FloatingPointStackifierPass());
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if (PrintMachineCode)
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PM.add(createMachineFunctionPrinterPass(&std::cerr));
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// Insert prolog/epilog code. Eliminate abstract frame index references...
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PM.add(createPrologEpilogCodeInserter());
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PM.add(createX86PeepholeOptimizerPass());
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if (PrintMachineCode) // Print the register-allocated code
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PM.add(createX86CodePrinterPass(std::cerr, *this));
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if (!DisableOutput)
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switch (FileType) {
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default:
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assert(0 && "Unexpected filetype here!");
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case TargetMachine::AssemblyFile:
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PM.add(createX86CodePrinterPass(Out, *this));
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break;
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case TargetMachine::ObjectFile:
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// FIXME: We only support emission of ELF files for now, this should check
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// the target triple and decide on the format to write (e.g. COFF on
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// win32).
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addX86ELFObjectWriterPass(PM, Out, *this);
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break;
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}
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// Delete machine code for this function
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PM.add(createMachineCodeDeleter());
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return false; // success!
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}
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/// addPassesToJITCompile - Add passes to the specified pass manager to
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/// implement a fast dynamic compiler for this target. Return true if this is
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/// not supported for this target.
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///
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void X86JITInfo::addPassesToJITCompile(FunctionPassManager &PM) {
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// FIXME: Implement efficient support for garbage collection intrinsics.
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PM.add(createLowerGCPass());
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// FIXME: Implement the invoke/unwind instructions!
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PM.add(createLowerInvokePass());
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// FIXME: Implement the switch instruction in the instruction selector!
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PM.add(createLowerSwitchPass());
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// Make sure that no unreachable blocks are instruction selected.
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PM.add(createUnreachableBlockEliminationPass());
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// Default to pattern ISel
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if (PatternISelTriState == 0)
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PM.add(createX86SimpleInstructionSelector(TM));
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else
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PM.add(createX86PatternInstructionSelector(TM));
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// Run optional SSA-based machine code optimizations next...
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if (!NoSSAPeephole)
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PM.add(createX86SSAPeepholeOptimizerPass());
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// FIXME: Add SSA based peephole optimizer here.
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// Print the instruction selected machine code...
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if (PrintMachineCode)
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PM.add(createMachineFunctionPrinterPass(&std::cerr));
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// Perform register allocation to convert to a concrete x86 representation
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PM.add(createRegisterAllocator());
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if (PrintMachineCode)
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PM.add(createMachineFunctionPrinterPass(&std::cerr));
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PM.add(createX86FloatingPointStackifierPass());
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if (PrintMachineCode)
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PM.add(createMachineFunctionPrinterPass(&std::cerr));
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// Insert prolog/epilog code. Eliminate abstract frame index references...
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PM.add(createPrologEpilogCodeInserter());
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PM.add(createX86PeepholeOptimizerPass());
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if (PrintMachineCode) // Print the register-allocated code
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PM.add(createX86CodePrinterPass(std::cerr, TM));
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}
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bool X86TargetMachine::addPassesToEmitMachineCode(FunctionPassManager &PM,
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MachineCodeEmitter &MCE) {
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PM.add(createX86CodeEmitterPass(MCE));
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// Delete machine code for this function
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PM.add(createMachineCodeDeleter());
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return false;
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}
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