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	IRCE eliminates range checks of the form
  0 <= A * I + B < Length
by splitting a loop's iteration space into three segments in a way
that the check is completely redundant in the middle segment.  As an
example, IRCE will convert
  len = < known positive >
  for (i = 0; i < n; i++) {
    if (0 <= i && i < len) {
      do_something();
    } else {
      throw_out_of_bounds();
    }
  }
to
  len = < known positive >
  limit = smin(n, len)
  // no first segment
  for (i = 0; i < limit; i++) {
    if (0 <= i && i < len) { // this check is fully redundant
      do_something();
    } else {
      throw_out_of_bounds();
    }
  }
  for (i = limit; i < n; i++) {
    if (0 <= i && i < len) {
      do_something();
    } else {
      throw_out_of_bounds();
    }
  }
IRCE can deal with multiple range checks in the same loop (it takes
the intersection of the ranges that will make each of them redundant
individually).
Currently IRCE does not do any profitability analysis.  That is a
TODO.
Please note that the status of this pass is *experimental*, and it is
not part of any default pass pipeline.  Having said that, I will love
to get feedback and general input from people interested in trying
this out.
This pass was originally r226201.  It was reverted because it used C++
features not supported by MSVC 2012.
Differential Revision: http://reviews.llvm.org/D6693
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226238 91177308-0d34-0410-b5e6-96231b3b80d8
		
	
		
			
				
	
	
		
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			183 lines
		
	
	
		
			7.9 KiB
		
	
	
	
		
			C++
		
	
	
	
	
	
| //===- llvm/LinkAllPasses.h ------------ Reference All Passes ---*- C++ -*-===//
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| //
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| //                      The LLVM Compiler Infrastructure
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| //
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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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| //
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| //===----------------------------------------------------------------------===//
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| //
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| // This header file pulls in all transformation and analysis passes for tools
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| // like opt and bugpoint that need this functionality.
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| //
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| //===----------------------------------------------------------------------===//
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| 
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| #ifndef LLVM_LINKALLPASSES_H
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| #define LLVM_LINKALLPASSES_H
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| 
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| #include "llvm/Analysis/AliasSetTracker.h"
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| #include "llvm/Analysis/CallPrinter.h"
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| #include "llvm/Analysis/DomPrinter.h"
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| #include "llvm/Analysis/IntervalPartition.h"
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| #include "llvm/Analysis/Lint.h"
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| #include "llvm/Analysis/Passes.h"
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| #include "llvm/Analysis/PostDominators.h"
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| #include "llvm/Analysis/RegionPass.h"
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| #include "llvm/Analysis/RegionPrinter.h"
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| #include "llvm/Analysis/ScalarEvolution.h"
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| #include "llvm/CodeGen/Passes.h"
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| #include "llvm/IR/Function.h"
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| #include "llvm/IR/IRPrintingPasses.h"
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| #include "llvm/Transforms/IPO.h"
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| #include "llvm/Transforms/Instrumentation.h"
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| #include "llvm/Transforms/ObjCARC.h"
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| #include "llvm/Transforms/Scalar.h"
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| #include "llvm/Transforms/Utils/SymbolRewriter.h"
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| #include "llvm/Transforms/Utils/UnifyFunctionExitNodes.h"
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| #include "llvm/Transforms/Vectorize.h"
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| #include <cstdlib>
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| 
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| namespace {
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|   struct ForcePassLinking {
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|     ForcePassLinking() {
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|       // We must reference the passes in such a way that compilers will not
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|       // delete it all as dead code, even with whole program optimization,
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|       // yet is effectively a NO-OP. As the compiler isn't smart enough
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|       // to know that getenv() never returns -1, this will do the job.
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|       if (std::getenv("bar") != (char*) -1)
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|         return;
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| 
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|       (void) llvm::createAAEvalPass();
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|       (void) llvm::createAggressiveDCEPass();
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|       (void) llvm::createAliasAnalysisCounterPass();
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|       (void) llvm::createAliasDebugger();
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|       (void) llvm::createArgumentPromotionPass();
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|       (void) llvm::createAlignmentFromAssumptionsPass();
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|       (void) llvm::createBasicAliasAnalysisPass();
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|       (void) llvm::createLibCallAliasAnalysisPass(nullptr);
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|       (void) llvm::createScalarEvolutionAliasAnalysisPass();
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|       (void) llvm::createTypeBasedAliasAnalysisPass();
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|       (void) llvm::createScopedNoAliasAAPass();
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|       (void) llvm::createBoundsCheckingPass();
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|       (void) llvm::createBreakCriticalEdgesPass();
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|       (void) llvm::createCallGraphPrinterPass();
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|       (void) llvm::createCallGraphViewerPass();
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|       (void) llvm::createCFGSimplificationPass();
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|       (void) llvm::createCFLAliasAnalysisPass();
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|       (void) llvm::createStructurizeCFGPass();
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|       (void) llvm::createConstantMergePass();
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|       (void) llvm::createConstantPropagationPass();
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|       (void) llvm::createCostModelAnalysisPass();
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|       (void) llvm::createDeadArgEliminationPass();
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|       (void) llvm::createDeadCodeEliminationPass();
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|       (void) llvm::createDeadInstEliminationPass();
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|       (void) llvm::createDeadStoreEliminationPass();
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|       (void) llvm::createDependenceAnalysisPass();
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|       (void) llvm::createDomOnlyPrinterPass();
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|       (void) llvm::createDomPrinterPass();
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|       (void) llvm::createDomOnlyViewerPass();
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|       (void) llvm::createDomViewerPass();
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|       (void) llvm::createGCOVProfilerPass();
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|       (void) llvm::createInstrProfilingPass();
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|       (void) llvm::createFunctionInliningPass();
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|       (void) llvm::createAlwaysInlinerPass();
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|       (void) llvm::createGlobalDCEPass();
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|       (void) llvm::createGlobalOptimizerPass();
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|       (void) llvm::createGlobalsModRefPass();
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|       (void) llvm::createIPConstantPropagationPass();
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|       (void) llvm::createIPSCCPPass();
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|       (void) llvm::createInductiveRangeCheckEliminationPass();
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|       (void) llvm::createIndVarSimplifyPass();
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|       (void) llvm::createInstructionCombiningPass();
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|       (void) llvm::createInternalizePass();
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|       (void) llvm::createJumpInstrTableInfoPass();
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|       (void) llvm::createJumpInstrTablesPass();
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|       (void) llvm::createLCSSAPass();
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|       (void) llvm::createLICMPass();
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|       (void) llvm::createLazyValueInfoPass();
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|       (void) llvm::createLoopExtractorPass();
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|       (void) llvm::createLoopSimplifyPass();
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|       (void) llvm::createLoopStrengthReducePass();
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|       (void) llvm::createLoopRerollPass();
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|       (void) llvm::createLoopUnrollPass();
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|       (void) llvm::createLoopUnswitchPass();
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|       (void) llvm::createLoopIdiomPass();
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|       (void) llvm::createLoopRotatePass();
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|       (void) llvm::createLowerExpectIntrinsicPass();
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|       (void) llvm::createLowerInvokePass();
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|       (void) llvm::createLowerSwitchPass();
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|       (void) llvm::createNoAAPass();
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|       (void) llvm::createObjCARCAliasAnalysisPass();
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|       (void) llvm::createObjCARCAPElimPass();
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|       (void) llvm::createObjCARCExpandPass();
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|       (void) llvm::createObjCARCContractPass();
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|       (void) llvm::createObjCARCOptPass();
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|       (void) llvm::createPAEvalPass();
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|       (void) llvm::createPromoteMemoryToRegisterPass();
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|       (void) llvm::createDemoteRegisterToMemoryPass();
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|       (void) llvm::createPruneEHPass();
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|       (void) llvm::createPostDomOnlyPrinterPass();
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|       (void) llvm::createPostDomPrinterPass();
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|       (void) llvm::createPostDomOnlyViewerPass();
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|       (void) llvm::createPostDomViewerPass();
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|       (void) llvm::createReassociatePass();
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|       (void) llvm::createRegionInfoPass();
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|       (void) llvm::createRegionOnlyPrinterPass();
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|       (void) llvm::createRegionOnlyViewerPass();
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|       (void) llvm::createRegionPrinterPass();
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|       (void) llvm::createRegionViewerPass();
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|       (void) llvm::createSCCPPass();
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|       (void) llvm::createScalarReplAggregatesPass();
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|       (void) llvm::createSingleLoopExtractorPass();
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|       (void) llvm::createStripSymbolsPass();
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|       (void) llvm::createStripNonDebugSymbolsPass();
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|       (void) llvm::createStripDeadDebugInfoPass();
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|       (void) llvm::createStripDeadPrototypesPass();
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|       (void) llvm::createTailCallEliminationPass();
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|       (void) llvm::createJumpThreadingPass();
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|       (void) llvm::createUnifyFunctionExitNodesPass();
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|       (void) llvm::createInstCountPass();
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|       (void) llvm::createConstantHoistingPass();
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|       (void) llvm::createCodeGenPreparePass();
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|       (void) llvm::createEarlyCSEPass();
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|       (void) llvm::createMergedLoadStoreMotionPass();
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|       (void) llvm::createGVNPass();
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|       (void) llvm::createMemCpyOptPass();
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|       (void) llvm::createLoopDeletionPass();
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|       (void) llvm::createPostDomTree();
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|       (void) llvm::createInstructionNamerPass();
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|       (void) llvm::createMetaRenamerPass();
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|       (void) llvm::createFunctionAttrsPass();
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|       (void) llvm::createMergeFunctionsPass();
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|       (void) llvm::createPrintModulePass(*(llvm::raw_ostream*)nullptr);
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|       (void) llvm::createPrintFunctionPass(*(llvm::raw_ostream*)nullptr);
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|       (void) llvm::createPrintBasicBlockPass(*(llvm::raw_ostream*)nullptr);
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|       (void) llvm::createModuleDebugInfoPrinterPass();
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|       (void) llvm::createPartialInliningPass();
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|       (void) llvm::createLintPass();
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|       (void) llvm::createSinkingPass();
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|       (void) llvm::createLowerAtomicPass();
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|       (void) llvm::createCorrelatedValuePropagationPass();
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|       (void) llvm::createMemDepPrinter();
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|       (void) llvm::createInstructionSimplifierPass();
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|       (void) llvm::createLoopVectorizePass();
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|       (void) llvm::createSLPVectorizerPass();
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|       (void) llvm::createBBVectorizePass();
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|       (void) llvm::createPartiallyInlineLibCallsPass();
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|       (void) llvm::createScalarizerPass();
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|       (void) llvm::createSeparateConstOffsetFromGEPPass();
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|       (void) llvm::createRewriteSymbolsPass();
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| 
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|       (void)new llvm::IntervalPartition();
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|       (void)new llvm::ScalarEvolution();
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|       ((llvm::Function*)nullptr)->viewCFGOnly();
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|       llvm::RGPassManager RGM;
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|       ((llvm::RegionPass*)nullptr)->runOnRegion((llvm::Region*)nullptr, RGM);
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|       llvm::AliasSetTracker X(*(llvm::AliasAnalysis*)nullptr);
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|       X.add(nullptr, 0, llvm::AAMDNodes()); // for -print-alias-sets
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|     }
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|   } ForcePassLinking; // Force link by creating a global definition.
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| }
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| 
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| #endif
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