示例#1
0
static void AddStandardCompilePasses(PassManager &PM) {
  PM.add(createVerifierPass());                  // Verify that input is correct

#if LLVM_VERSION_CODE < LLVM_VERSION(3, 0)
  addPass(PM, createLowerSetJmpPass());          // Lower llvm.setjmp/.longjmp
#endif

  // If the -strip-debug command line option was specified, do it.
  if (StripDebug)
    addPass(PM, createStripSymbolsPass(true));

  if (DisableOptimizations) return;

  addPass(PM, createCFGSimplificationPass());    // Clean up disgusting code
  addPass(PM, createPromoteMemoryToRegisterPass());// Kill useless allocas
  addPass(PM, createGlobalOptimizerPass());      // Optimize out global vars
  addPass(PM, createGlobalDCEPass());            // Remove unused fns and globs
  addPass(PM, createIPConstantPropagationPass());// IP Constant Propagation
  addPass(PM, createDeadArgEliminationPass());   // Dead argument elimination
  addPass(PM, createInstructionCombiningPass()); // Clean up after IPCP & DAE
  addPass(PM, createCFGSimplificationPass());    // Clean up after IPCP & DAE

  addPass(PM, createPruneEHPass());              // Remove dead EH info
  addPass(PM, createFunctionAttrsPass());        // Deduce function attrs

  if (!DisableInline)
    addPass(PM, createFunctionInliningPass());   // Inline small functions
  addPass(PM, createArgumentPromotionPass());    // Scalarize uninlined fn args

#if LLVM_VERSION_CODE < LLVM_VERSION(3, 4)
  addPass(PM, createSimplifyLibCallsPass());     // Library Call Optimizations
#endif
  addPass(PM, createInstructionCombiningPass()); // Cleanup for scalarrepl.
  addPass(PM, createJumpThreadingPass());        // Thread jumps.
  addPass(PM, createCFGSimplificationPass());    // Merge & remove BBs
  addPass(PM, createScalarReplAggregatesPass()); // Break up aggregate allocas
  addPass(PM, createInstructionCombiningPass()); // Combine silly seq's

  addPass(PM, createTailCallEliminationPass());  // Eliminate tail calls
  addPass(PM, createCFGSimplificationPass());    // Merge & remove BBs
  addPass(PM, createReassociatePass());          // Reassociate expressions
  addPass(PM, createLoopRotatePass());
  addPass(PM, createLICMPass());                 // Hoist loop invariants
  addPass(PM, createLoopUnswitchPass());         // Unswitch loops.
  // FIXME : Removing instcombine causes nestedloop regression.
  addPass(PM, createInstructionCombiningPass());
  addPass(PM, createIndVarSimplifyPass());       // Canonicalize indvars
  addPass(PM, createLoopDeletionPass());         // Delete dead loops
  addPass(PM, createLoopUnrollPass());           // Unroll small loops
  addPass(PM, createInstructionCombiningPass()); // Clean up after the unroller
  addPass(PM, createGVNPass());                  // Remove redundancies
  addPass(PM, createMemCpyOptPass());            // Remove memcpy / form memset
  addPass(PM, createSCCPPass());                 // Constant prop with SCCP

  // Run instcombine after redundancy elimination to exploit opportunities
  // opened up by them.
  addPass(PM, createInstructionCombiningPass());

  addPass(PM, createDeadStoreEliminationPass()); // Delete dead stores
  addPass(PM, createAggressiveDCEPass());        // Delete dead instructions
  addPass(PM, createCFGSimplificationPass());    // Merge & remove BBs
  addPass(PM, createStripDeadPrototypesPass());  // Get rid of dead prototypes
#if LLVM_VERSION_CODE < LLVM_VERSION(3, 0)
  addPass(PM, createDeadTypeEliminationPass());  // Eliminate dead types
#endif
  addPass(PM, createConstantMergePass());        // Merge dup global constants
}
static void createOptimizationPasses() {
  // Create and set up the per-function pass manager.
  // FIXME: Move the code generator to be function-at-a-time.
  PerFunctionPasses =
    new FunctionPassManager(new ExistingModuleProvider(TheModule));
  PerFunctionPasses->add(new TargetData(*TheTarget->getTargetData()));

  // In -O0 if checking is disabled, we don't even have per-function passes.
  bool HasPerFunctionPasses = false;
#ifdef ENABLE_CHECKING
  PerFunctionPasses->add(createVerifierPass());
  HasPerFunctionPasses = true;
#endif

  if (optimize > 0 && !DisableLLVMOptimizations) {
    HasPerFunctionPasses = true;
    PerFunctionPasses->add(createCFGSimplificationPass());
    if (optimize == 1)
      PerFunctionPasses->add(createPromoteMemoryToRegisterPass());
    else
      PerFunctionPasses->add(createScalarReplAggregatesPass());
    PerFunctionPasses->add(createInstructionCombiningPass());
    //    PerFunctionPasses->add(createCFGSimplificationPass());
  }

  // FIXME: AT -O0/O1, we should stream out functions at a time.
  PerModulePasses = new PassManager();
  PerModulePasses->add(new TargetData(*TheTarget->getTargetData()));
  bool HasPerModulePasses = false;

  if (optimize > 0 && !DisableLLVMOptimizations) {
    HasPerModulePasses = true;
    PassManager *PM = PerModulePasses;
    if (flag_unit_at_a_time)
      PM->add(createRaiseAllocationsPass());      // call %malloc -> malloc inst
    PM->add(createCFGSimplificationPass());       // Clean up disgusting code
    PM->add(createPromoteMemoryToRegisterPass()); // Kill useless allocas
    if (flag_unit_at_a_time) {
      PM->add(createGlobalOptimizerPass());       // Optimize out global vars
      PM->add(createGlobalDCEPass());             // Remove unused fns and globs
      PM->add(createIPConstantPropagationPass()); // IP Constant Propagation
      PM->add(createDeadArgEliminationPass());    // Dead argument elimination
    }
    PM->add(createInstructionCombiningPass());    // Clean up after IPCP & DAE
    // DISABLE PREDSIMPLIFY UNTIL PR967 is fixed.
    //PM->add(createPredicateSimplifierPass());   // Canonicalize registers
    PM->add(createCFGSimplificationPass());       // Clean up after IPCP & DAE
    if (flag_unit_at_a_time)
      PM->add(createPruneEHPass());               // Remove dead EH info

    if (optimize > 1) {
      if (flag_inline_trees > 1)                // respect -fno-inline-functions
        PM->add(createFunctionInliningPass());  // Inline small functions
      if (flag_unit_at_a_time && !lang_hooks.flag_no_builtin())
        PM->add(createSimplifyLibCallsPass());  // Library Call Optimizations

      if (optimize > 2)
    	PM->add(createArgumentPromotionPass()); // Scalarize uninlined fn args
    }
    
    PM->add(createTailDuplicationPass());       // Simplify cfg by copying code
    PM->add(createInstructionCombiningPass());  // Cleanup for scalarrepl.
    PM->add(createCFGSimplificationPass());     // Merge & remove BBs
    PM->add(createScalarReplAggregatesPass());  // Break up aggregate allocas
    PM->add(createInstructionCombiningPass());  // Combine silly seq's
    PM->add(createCondPropagationPass());       // Propagate conditionals
    PM->add(createTailCallEliminationPass());   // Eliminate tail calls
    PM->add(createCFGSimplificationPass());     // Merge & remove BBs
    PM->add(createReassociatePass());           // Reassociate expressions
    PM->add(createLoopRotatePass());            // Rotate Loop
    PM->add(createLICMPass());                  // Hoist loop invariants
    PM->add(createLoopUnswitchPass(optimize_size ? true : false));
    PM->add(createInstructionCombiningPass());  // Clean up after LICM/reassoc
    PM->add(createIndVarSimplifyPass());        // Canonicalize indvars
    if (flag_unroll_loops)
      PM->add(createLoopUnrollPass());          // Unroll small loops
    PM->add(createInstructionCombiningPass());  // Clean up after the unroller
    PM->add(createLoadValueNumberingPass());    // GVN for load instructions
    PM->add(createGCSEPass());                  // Remove common subexprs
    PM->add(createSCCPPass());                  // Constant prop with SCCP
    
    // Run instcombine after redundancy elimination to exploit opportunities
    // opened up by them.
    PM->add(createInstructionCombiningPass());
    PM->add(createCondPropagationPass());       // Propagate conditionals
    PM->add(createDeadStoreEliminationPass());  // Delete dead stores
    PM->add(createAggressiveDCEPass());         // SSA based 'Aggressive DCE'
    PM->add(createCFGSimplificationPass());     // Merge & remove BBs
    
    if (optimize > 1 && flag_unit_at_a_time)
      PM->add(createConstantMergePass());       // Merge dup global constants 
    PM->add(createStripDeadPrototypesPass());   // Get rid of dead prototypes
  }
  
  if (emit_llvm_bc) {
    // Emit an LLVM .bc file to the output.  This is used when passed
    // -emit-llvm -c to the GCC driver.
    PerModulePasses->add(CreateBitcodeWriterPass(*AsmOutStream));

    // Disable emission of .ident into the output file... which is completely
    // wrong for llvm/.bc emission cases.
    flag_no_ident = 1;
    HasPerModulePasses = true;
  } else if (emit_llvm) {
    // Emit an LLVM .ll file to the output.  This is used when passed 
    // -emit-llvm -S to the GCC driver.
    PerModulePasses->add(new PrintModulePass(AsmOutFile));
    
    // Disable emission of .ident into the output file... which is completely
    // wrong for llvm/.bc emission cases.
    flag_no_ident = 1;
    HasPerModulePasses = true;
  } else {
    FunctionPassManager *PM;
    
    // If there are passes we have to run on the entire module, we do codegen
    // as a separate "pass" after that happens.
    // FIXME: This is disabled right now until bugs can be worked out.  Reenable
    // this for fast -O0 compiles!
    if (HasPerModulePasses || 1) {
      CodeGenPasses = PM =
        new FunctionPassManager(new ExistingModuleProvider(TheModule));
      PM->add(new TargetData(*TheTarget->getTargetData()));
    } else {
      // If there are no module-level passes that have to be run, we codegen as
      // each function is parsed.
      PM = PerFunctionPasses;
      HasPerFunctionPasses = true;
    }

    // Normal mode, emit a .s file by running the code generator.
    switch (TheTarget->addPassesToEmitFile(*PM, *AsmOutStream,
                                           TargetMachine::AssemblyFile,
                                           /*FAST*/optimize == 0)) {
    default:
    case FileModel::Error:
      cerr << "Error interfacing to target machine!\n";
      exit(1);
    case FileModel::AsmFile:
      break;
    }

    if (TheTarget->addPassesToEmitFileFinish(*PM, 0, /*Fast*/optimize == 0)) {
      cerr << "Error interfacing to target machine!\n";
      exit(1);
    }
  }
  
  if (HasPerFunctionPasses) {
    PerFunctionPasses->doInitialization();
  } else {
    delete PerFunctionPasses;
    PerFunctionPasses = 0;
  }
  if (!HasPerModulePasses) {
    delete PerModulePasses;
    PerModulePasses = 0;
  }
}