llvm::SimplifyCFGPass Class Reference

A pass to simplify and canonicalize the CFG of a function. More...

#include "llvm/Transforms/Scalar/SimplifyCFG.h"

Inheritance diagram for llvm::SimplifyCFGPass:

Public Member Functions
	SimplifyCFGPass ()
	The default constructor sets the pass options to create canonical IR, rather than optimal IR.
	SimplifyCFGPass (const SimplifyCFGOptions &PassOptions)
	Construct a pass with optional optimizations.
PreservedAnalyses	run (Function &F, FunctionAnalysisManager &AM)
	Run the pass over the function.
void	printPipeline (raw_ostream &OS, function_ref< StringRef(StringRef)> MapClassName2PassName)
Public Member Functions inherited from llvm::PassInfoMixin< SimplifyCFGPass >
void	printPipeline (raw_ostream &OS, function_ref< StringRef(StringRef)> MapClassName2PassName)

Additional Inherited Members
Static Public Member Functions inherited from llvm::PassInfoMixin< SimplifyCFGPass >
static StringRef	name ()
	Gets the name of the pass we are mixed into.

Detailed Description

A pass to simplify and canonicalize the CFG of a function.

This pass iteratively simplifies the entire CFG of a function. It may change or remove control flow to put the CFG into a canonical form expected by other passes of the mid-level optimizer. Depending on the specified options, it may further optimize control-flow to create non-canonical forms.

Definition at line 29 of file SimplifyCFG.h.

Constructor & Destructor Documentation

SimplifyCFGPass() [1/2]

SimplifyCFGPass::SimplifyCFGPass

(

)

The default constructor sets the pass options to create canonical IR, rather than optimal IR.

That is, by default we bypass transformations that are likely to improve performance but make analysis for other passes more difficult.

Definition at line 342 of file SimplifyCFGPass.cpp.

References applyCommandLineOverridesToOptions().

SimplifyCFGPass() [2/2]

SimplifyCFGPass::SimplifyCFGPass

(

const SimplifyCFGOptions &

PassOptions

)

Construct a pass with optional optimizations.

Definition at line 346 of file SimplifyCFGPass.cpp.

References applyCommandLineOverridesToOptions().

Member Function Documentation

printPipeline()

void SimplifyCFGPass::printPipeline	(	raw_ostream &	OS,
		function_ref< StringRef(StringRef)>	MapClassName2PassName
	)

Definition at line 351 of file SimplifyCFGPass.cpp.

References llvm::SimplifyCFGOptions::BonusInstThreshold, llvm::SimplifyCFGOptions::ConvertSwitchRangeToICmp, llvm::SimplifyCFGOptions::ConvertSwitchToLookupTable, llvm::SimplifyCFGOptions::ForwardSwitchCondToPhi, llvm::SimplifyCFGOptions::HoistCommonInsts, llvm::SimplifyCFGOptions::HoistLoadsStoresWithCondFaulting, llvm::SimplifyCFGOptions::NeedCanonicalLoop, OS, printPipeline(), llvm::SimplifyCFGOptions::SimplifyCondBranch, llvm::SimplifyCFGOptions::SinkCommonInsts, llvm::SimplifyCFGOptions::SpeculateBlocks, and llvm::SimplifyCFGOptions::SpeculateUnpredictables.

Referenced by printPipeline().

run()

PreservedAnalyses SimplifyCFGPass::run	(	Function &	F,
		FunctionAnalysisManager &	AM
	)

Run the pass over the function.

Definition at line 374 of file SimplifyCFGPass.cpp.

References llvm::SimplifyCFGOptions::AC, llvm::PreservedAnalyses::all(), F, llvm::AnalysisManager< IRUnitT, ExtraArgTs >::getResult(), llvm::PreservedAnalyses::preserve(), llvm::RequireAndPreserveDomTree, and simplifyFunctionCFG().

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The documentation for this class was generated from the following files:

• include/llvm/Transforms/Scalar/SimplifyCFG.h
• lib/Transforms/Scalar/SimplifyCFGPass.cpp