2006-09-04 12:16:09 +08:00
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//===-- LLVMTargetMachine.cpp - Implement the LLVMTargetMachine class -----===//
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//
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// The LLVM Compiler Infrastructure
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//
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2007-12-30 04:36:04 +08:00
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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2006-09-04 12:16:09 +08:00
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the LLVMTargetMachine class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/PassManager.h"
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#include "llvm/Pass.h"
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2007-03-31 08:24:43 +08:00
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#include "llvm/Assembly/PrintModulePass.h"
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2007-03-07 05:14:09 +08:00
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#include "llvm/Analysis/LoopPass.h"
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2006-09-04 12:16:09 +08:00
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#include "llvm/CodeGen/Passes.h"
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2008-08-17 20:56:54 +08:00
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#include "llvm/CodeGen/GCStrategy.h"
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2006-09-04 12:16:09 +08:00
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#include "llvm/Target/TargetOptions.h"
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2008-04-02 08:25:04 +08:00
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#include "llvm/Target/TargetAsmInfo.h"
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2006-09-04 12:16:09 +08:00
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#include "llvm/Transforms/Scalar.h"
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2007-03-31 08:24:43 +08:00
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#include "llvm/Support/CommandLine.h"
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2008-08-21 08:14:44 +08:00
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#include "llvm/Support/raw_ostream.h"
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2006-09-04 12:16:09 +08:00
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using namespace llvm;
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2008-09-25 09:14:49 +08:00
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namespace llvm {
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bool EnableFastISel;
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}
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2007-06-19 13:47:49 +08:00
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static cl::opt<bool> PrintLSR("print-lsr-output", cl::Hidden,
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cl::desc("Print LLVM IR produced by the loop-reduce pass"));
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static cl::opt<bool> PrintISelInput("print-isel-input", cl::Hidden,
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cl::desc("Print LLVM IR input to isel pass"));
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2007-07-21 05:56:13 +08:00
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static cl::opt<bool> PrintEmittedAsm("print-emitted-asm", cl::Hidden,
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cl::desc("Dump emitter generated instructions as assembly"));
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2008-01-07 09:33:09 +08:00
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static cl::opt<bool> PrintGCInfo("print-gc", cl::Hidden,
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cl::desc("Dump garbage collector data"));
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2009-05-16 08:33:53 +08:00
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static cl::opt<bool> VerifyMachineCode("verify-machineinstrs", cl::Hidden,
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cl::desc("Verify generated machine code"),
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cl::init(getenv("LLVM_VERIFY_MACHINEINSTRS")!=NULL));
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2007-06-19 13:47:49 +08:00
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2008-01-15 03:00:06 +08:00
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// When this works it will be on by default.
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static cl::opt<bool>
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DisablePostRAScheduler("disable-post-RA-scheduler",
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cl::desc("Disable scheduling after register allocation"),
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cl::init(true));
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2008-10-02 04:39:19 +08:00
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// Enable or disable FastISel. Both options are needed, because
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// FastISel is enabled by default with -fast, and we wish to be
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// able to enable or disable fast-isel independently from -fast.
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2008-10-08 07:00:56 +08:00
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static cl::opt<cl::boolOrDefault>
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2008-10-02 04:39:19 +08:00
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EnableFastISelOption("fast-isel", cl::Hidden,
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cl::desc("Enable the experimental \"fast\" instruction selector"));
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2008-09-25 09:14:49 +08:00
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2007-02-08 09:36:53 +08:00
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FileModel::Model
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2008-03-12 06:29:46 +08:00
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LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
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2008-08-21 08:14:44 +08:00
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raw_ostream &Out,
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2007-02-08 09:36:53 +08:00
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CodeGenFileType FileType,
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2009-04-30 07:29:43 +08:00
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CodeGenOpt::Level OptLevel) {
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2008-09-25 08:37:07 +08:00
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// Add common CodeGen passes.
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2009-04-29 08:15:41 +08:00
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if (addCommonCodeGenPasses(PM, OptLevel))
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2007-02-08 09:36:53 +08:00
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return FileModel::Error;
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2006-11-08 03:33:46 +08:00
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// Fold redundant debug labels.
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PM.add(createDebugLabelFoldingPass());
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2008-09-25 08:37:07 +08:00
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if (PrintMachineCode)
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2007-02-08 09:36:53 +08:00
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PM.add(createMachineFunctionPrinterPass(cerr));
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2009-04-29 08:15:41 +08:00
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if (addPreEmitPass(PM, OptLevel) && PrintMachineCode)
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2007-02-08 09:36:53 +08:00
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PM.add(createMachineFunctionPrinterPass(cerr));
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2009-04-30 07:29:43 +08:00
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if (OptLevel != CodeGenOpt::None)
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2009-05-07 13:42:24 +08:00
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PM.add(createCodePlacementOptPass());
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2008-02-29 07:29:57 +08:00
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2006-09-04 12:16:09 +08:00
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switch (FileType) {
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2007-02-08 09:36:53 +08:00
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default:
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break;
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case TargetMachine::AssemblyFile:
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2009-04-29 08:15:41 +08:00
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if (addAssemblyEmitter(PM, OptLevel, getAsmVerbosityDefault(), Out))
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2007-02-08 09:36:53 +08:00
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return FileModel::Error;
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return FileModel::AsmFile;
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case TargetMachine::ObjectFile:
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if (getMachOWriterInfo())
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return FileModel::MachOFile;
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else if (getELFWriterInfo())
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return FileModel::ElfFile;
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2006-09-04 12:16:09 +08:00
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}
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2007-02-08 09:36:53 +08:00
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return FileModel::Error;
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}
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2008-09-25 08:37:07 +08:00
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2007-02-08 09:36:53 +08:00
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/// addPassesToEmitFileFinish - If the passes to emit the specified file had to
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/// be split up (e.g., to add an object writer pass), this method can be used to
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/// finish up adding passes to emit the file, if necessary.
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2008-03-12 06:29:46 +08:00
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bool LLVMTargetMachine::addPassesToEmitFileFinish(PassManagerBase &PM,
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2007-02-08 09:36:53 +08:00
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MachineCodeEmitter *MCE,
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2009-04-30 07:29:43 +08:00
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CodeGenOpt::Level OptLevel) {
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2007-02-08 09:36:53 +08:00
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if (MCE)
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2009-04-29 08:15:41 +08:00
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addSimpleCodeEmitter(PM, OptLevel, PrintEmittedAsm, *MCE);
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2008-09-25 08:37:07 +08:00
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2008-08-18 02:44:35 +08:00
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PM.add(createGCInfoDeleter());
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2007-02-08 09:36:53 +08:00
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2006-09-04 12:16:09 +08:00
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// Delete machine code for this function
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PM.add(createMachineCodeDeleter());
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2007-02-08 09:36:53 +08:00
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2006-09-04 12:16:09 +08:00
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return false; // success!
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}
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2009-05-31 04:51:52 +08:00
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/// addPassesToEmitFileFinish - If the passes to emit the specified file had to
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/// be split up (e.g., to add an object writer pass), this method can be used to
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/// finish up adding passes to emit the file, if necessary.
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bool LLVMTargetMachine::addPassesToEmitFileFinish(PassManagerBase &PM,
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JITCodeEmitter *JCE,
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CodeGenOpt::Level OptLevel) {
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if (JCE)
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addSimpleCodeEmitter(PM, OptLevel, PrintEmittedAsm, *JCE);
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PM.add(createGCInfoDeleter());
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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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2009-07-06 13:09:34 +08:00
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/// addPassesToEmitFileFinish - If the passes to emit the specified file had to
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/// be split up (e.g., to add an object writer pass), this method can be used to
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/// finish up adding passes to emit the file, if necessary.
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bool LLVMTargetMachine::addPassesToEmitFileFinish(PassManagerBase &PM,
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ObjectCodeEmitter *OCE,
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CodeGenOpt::Level OptLevel) {
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if (OCE)
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addSimpleCodeEmitter(PM, OptLevel, PrintEmittedAsm, *OCE);
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PM.add(createGCInfoDeleter());
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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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2006-09-04 12:16:09 +08:00
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/// addPassesToEmitMachineCode - Add passes to the specified pass manager to
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/// get machine code emitted. This uses a MachineCodeEmitter object to handle
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/// actually outputting the machine code and resolving things like the address
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/// of functions. This method should returns true if machine code emission is
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/// not supported.
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///
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2008-03-12 06:29:46 +08:00
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bool LLVMTargetMachine::addPassesToEmitMachineCode(PassManagerBase &PM,
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2006-09-04 12:16:09 +08:00
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MachineCodeEmitter &MCE,
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2009-04-30 07:29:43 +08:00
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CodeGenOpt::Level OptLevel) {
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2008-09-25 08:37:07 +08:00
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// Add common CodeGen passes.
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2009-04-29 08:15:41 +08:00
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if (addCommonCodeGenPasses(PM, OptLevel))
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2008-09-25 08:37:07 +08:00
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return true;
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2009-04-29 08:15:41 +08:00
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if (addPreEmitPass(PM, OptLevel) && PrintMachineCode)
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2008-09-25 08:37:07 +08:00
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PM.add(createMachineFunctionPrinterPass(cerr));
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2009-04-29 08:15:41 +08:00
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addCodeEmitter(PM, OptLevel, PrintEmittedAsm, MCE);
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2008-09-25 08:37:07 +08:00
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PM.add(createGCInfoDeleter());
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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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2009-05-31 04:51:52 +08:00
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/// addPassesToEmitMachineCode - Add passes to the specified pass manager to
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/// get machine code emitted. This uses a MachineCodeEmitter object to handle
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/// actually outputting the machine code and resolving things like the address
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/// of functions. This method should returns true if machine code emission is
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/// not supported.
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///
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bool LLVMTargetMachine::addPassesToEmitMachineCode(PassManagerBase &PM,
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JITCodeEmitter &JCE,
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CodeGenOpt::Level OptLevel) {
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// Add common CodeGen passes.
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if (addCommonCodeGenPasses(PM, OptLevel))
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return true;
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if (addPreEmitPass(PM, OptLevel) && PrintMachineCode)
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PM.add(createMachineFunctionPrinterPass(cerr));
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addCodeEmitter(PM, OptLevel, PrintEmittedAsm, JCE);
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PM.add(createGCInfoDeleter());
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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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2009-05-16 08:33:53 +08:00
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static void printAndVerify(PassManagerBase &PM,
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bool allowDoubleDefs = false) {
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if (PrintMachineCode)
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PM.add(createMachineFunctionPrinterPass(cerr));
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if (VerifyMachineCode)
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PM.add(createMachineVerifierPass(allowDoubleDefs));
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}
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2009-04-30 07:29:43 +08:00
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/// addCommonCodeGenPasses - Add standard LLVM codegen passes used for both
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/// emitting to assembly files or machine code output.
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2008-09-25 08:37:07 +08:00
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///
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2009-04-29 08:15:41 +08:00
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bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM,
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2009-04-30 07:29:43 +08:00
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CodeGenOpt::Level OptLevel) {
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2006-09-04 12:16:09 +08:00
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// Standard LLVM-Level Passes.
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2008-09-25 08:37:07 +08:00
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2006-09-04 12:16:09 +08:00
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// Run loop strength reduction before anything else.
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2009-04-30 07:29:43 +08:00
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if (OptLevel != CodeGenOpt::None) {
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2007-03-31 12:18:03 +08:00
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PM.add(createLoopStrengthReducePass(getTargetLowering()));
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if (PrintLSR)
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2008-10-22 11:25:22 +08:00
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PM.add(createPrintFunctionPass("\n\n*** Code after LSR ***\n", &errs()));
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2007-03-31 12:18:03 +08:00
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}
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2008-09-25 08:37:07 +08:00
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2009-05-23 04:36:31 +08:00
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// Turn exception handling constructs into something the code generators can
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// handle.
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2008-04-02 08:25:04 +08:00
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if (!getTargetAsmInfo()->doesSupportExceptionHandling())
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2008-04-02 04:00:57 +08:00
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PM.add(createLowerInvokePass(getTargetLowering()));
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2009-05-23 04:36:31 +08:00
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else
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PM.add(createDwarfEHPass(getTargetLowering(), OptLevel==CodeGenOpt::None));
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PM.add(createGCLoweringPass());
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2008-09-25 08:37:07 +08:00
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2006-09-04 12:16:09 +08:00
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// Make sure that no unreachable blocks are instruction selected.
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PM.add(createUnreachableBlockEliminationPass());
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2007-02-08 09:36:53 +08:00
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2009-04-30 07:29:43 +08:00
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if (OptLevel != CodeGenOpt::None)
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2007-03-31 12:18:03 +08:00
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PM.add(createCodeGenPreparePass(getTargetLowering()));
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2008-11-13 09:02:14 +08:00
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PM.add(createStackProtectorPass(getTargetLowering()));
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2008-11-04 10:10:20 +08:00
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2007-03-31 12:18:03 +08:00
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if (PrintISelInput)
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2008-10-22 07:33:38 +08:00
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PM.add(createPrintFunctionPass("\n\n"
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"*** Final LLVM Code input to ISel ***\n",
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2008-10-22 11:25:22 +08:00
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&errs()));
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2007-03-31 12:18:03 +08:00
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2008-09-25 08:37:07 +08:00
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// Standard Lower-Level Passes.
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2008-10-02 04:39:19 +08:00
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// Enable FastISel with -fast, but allow that to be overridden.
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2008-10-08 07:00:56 +08:00
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if (EnableFastISelOption == cl::BOU_TRUE ||
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2009-04-30 07:29:43 +08:00
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(OptLevel == CodeGenOpt::None && EnableFastISelOption != cl::BOU_FALSE))
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2008-10-02 04:39:19 +08:00
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EnableFastISel = true;
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2006-09-04 12:16:09 +08:00
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// Ask the target for an isel.
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2009-04-29 08:15:41 +08:00
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if (addInstSelector(PM, OptLevel))
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2006-09-04 12:16:09 +08:00
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return true;
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2007-02-08 09:36:53 +08:00
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2006-09-04 12:16:09 +08:00
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// Print the instruction selected machine code...
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2009-05-16 08:33:53 +08:00
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printAndVerify(PM, /* allowDoubleDefs= */ true);
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Initial commit of the machine code LICM pass. It successfully hoists this:
_foo:
li r2, 0
LBB1_1: ; bb
li r5, 0
stw r5, 0(r3)
addi r2, r2, 1
addi r3, r3, 4
cmplw cr0, r2, r4
bne cr0, LBB1_1 ; bb
LBB1_2: ; return
blr
to:
_foo:
li r2, 0
li r5, 0
LBB1_1: ; bb
stw r5, 0(r3)
addi r2, r2, 1
addi r3, r3, 4
cmplw cr0, r2, r4
bne cr0, LBB1_1 ; bb
LBB1_2: ; return
blr
ZOMG!! :-)
Moar to come...
llvm-svn: 44687
2007-12-08 05:42:31 +08:00
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2009-04-30 07:29:43 +08:00
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if (OptLevel != CodeGenOpt::None) {
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2008-01-04 16:11:03 +08:00
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PM.add(createMachineLICMPass());
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2008-01-05 14:14:16 +08:00
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PM.add(createMachineSinkingPass());
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2009-07-14 07:44:01 +08:00
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printAndVerify(PM, /* allowDoubleDefs= */ true);
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2009-02-09 16:45:39 +08:00
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}
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Initial commit of the machine code LICM pass. It successfully hoists this:
_foo:
li r2, 0
LBB1_1: ; bb
li r5, 0
stw r5, 0(r3)
addi r2, r2, 1
addi r3, r3, 4
cmplw cr0, r2, r4
bne cr0, LBB1_1 ; bb
LBB1_2: ; return
blr
to:
_foo:
li r2, 0
li r5, 0
LBB1_1: ; bb
stw r5, 0(r3)
addi r2, r2, 1
addi r3, r3, 4
cmplw cr0, r2, r4
bne cr0, LBB1_1 ; bb
LBB1_2: ; return
blr
ZOMG!! :-)
Moar to come...
llvm-svn: 44687
2007-12-08 05:42:31 +08:00
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2008-04-24 02:26:03 +08:00
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// Run pre-ra passes.
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2009-05-16 08:33:53 +08:00
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|
if (addPreRegAlloc(PM, OptLevel))
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printAndVerify(PM);
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2008-04-24 02:26:03 +08:00
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2008-06-04 17:18:41 +08:00
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// Perform register allocation.
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2006-09-04 12:16:09 +08:00
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PM.add(createRegisterAllocator());
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2008-06-04 17:18:41 +08:00
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|
// Perform stack slot coloring.
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2009-04-30 07:29:43 +08:00
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|
if (OptLevel != CodeGenOpt::None)
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2009-05-13 02:31:57 +08:00
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|
PM.add(createStackSlotColoringPass(OptLevel >= CodeGenOpt::Aggressive));
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2008-06-04 17:18:41 +08:00
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2009-05-16 08:33:53 +08:00
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printAndVerify(PM); // Print the register-allocated code
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2008-09-25 08:37:07 +08:00
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2008-06-04 17:18:41 +08:00
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|
// Run post-ra passes.
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2009-05-16 08:33:53 +08:00
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|
if (addPostRegAlloc(PM, OptLevel))
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|
printAndVerify(PM);
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2008-09-25 08:37:07 +08:00
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2007-07-27 15:36:14 +08:00
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|
PM.add(createLowerSubregsPass());
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2009-05-16 08:33:53 +08:00
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|
printAndVerify(PM);
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2007-02-08 09:36:53 +08:00
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|
2006-09-04 12:16:09 +08:00
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|
// Insert prolog/epilog code. Eliminate abstract frame index references...
|
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|
PM.add(createPrologEpilogCodeInserter());
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2009-05-16 08:33:53 +08:00
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|
|
printAndVerify(PM);
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2008-09-25 08:37:07 +08:00
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|
2007-07-14 01:13:54 +08:00
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|
|
// Second pass scheduler.
|
2009-04-30 07:29:43 +08:00
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|
|
if (OptLevel != CodeGenOpt::None && !DisablePostRAScheduler) {
|
2007-07-14 01:31:29 +08:00
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|
|
PM.add(createPostRAScheduler());
|
2009-05-16 08:33:53 +08:00
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|
|
printAndVerify(PM);
|
2008-11-21 03:54:21 +08:00
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|
}
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|
2008-12-18 09:36:42 +08:00
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|
|
// Branch folding must be run after regalloc and prolog/epilog insertion.
|
2009-05-16 08:33:53 +08:00
|
|
|
if (OptLevel != CodeGenOpt::None) {
|
2008-12-18 09:36:42 +08:00
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|
|
PM.add(createBranchFoldingPass(getEnableTailMergeDefault()));
|
2009-05-16 08:33:53 +08:00
|
|
|
printAndVerify(PM);
|
|
|
|
}
|
2008-12-18 09:36:42 +08:00
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|
|
|
2008-01-07 09:33:09 +08:00
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|
|
PM.add(createGCMachineCodeAnalysisPass());
|
2009-05-16 08:33:53 +08:00
|
|
|
printAndVerify(PM);
|
2008-09-25 08:37:07 +08:00
|
|
|
|
2008-01-07 09:33:09 +08:00
|
|
|
if (PrintGCInfo)
|
2008-08-18 02:44:35 +08:00
|
|
|
PM.add(createGCInfoPrinter(*cerr));
|
2007-02-08 09:36:53 +08:00
|
|
|
|
2008-09-25 08:37:07 +08:00
|
|
|
return false;
|
2006-09-04 12:16:09 +08:00
|
|
|
}
|