llvm::SwitchCG Namespace Reference

Classes
struct	BitTestBlock
struct	BitTestCase
struct	CaseBits
struct	CaseBlock
	This structure is used to communicate between SelectionDAGBuilder and SDISel for the code generation of additional basic blocks needed by multi-case switch statements. More...
struct	CaseCluster
	A cluster of case labels. More...
struct	JumpTable
struct	JumpTableHeader
class	SwitchLowering
struct	SwitchWorkListItem

Typedefs
using	CaseClusterVector = std::vector< CaseCluster >
using	CaseClusterIt = CaseClusterVector::iterator
using	CaseBitsVector = std::vector< CaseBits >
using	JumpTableBlock = std::pair< JumpTableHeader, JumpTable >
using	BitTestInfo = SmallVector< BitTestCase, 3 >
using	SwitchWorkList = SmallVector< SwitchWorkListItem, 4 >

Enumerations
enum	CaseClusterKind { CC_Range , CC_JumpTable , CC_BitTests }

Functions
void	sortAndRangeify (CaseClusterVector &Clusters)
	Sort Clusters and merge adjacent cases.
uint64_t	getJumpTableRange (const CaseClusterVector &Clusters, unsigned First, unsigned Last)
	Return the range of values within a range.
uint64_t	getJumpTableNumCases (const SmallVectorImpl< unsigned > &TotalCases, unsigned First, unsigned Last)
	Return the number of cases within a range.

Typedef Documentation

BitTestInfo

using llvm::SwitchCG::BitTestInfo = typedef SmallVector<BitTestCase, 3>

Definition at line 210 of file SwitchLoweringUtils.h.

CaseBitsVector

using llvm::SwitchCG::CaseBitsVector = typedef std::vector<CaseBits>

Definition at line 104 of file SwitchLoweringUtils.h.

CaseClusterIt

using llvm::SwitchCG::CaseClusterIt = typedef CaseClusterVector::iterator

Definition at line 87 of file SwitchLoweringUtils.h.

CaseClusterVector

using llvm::SwitchCG::CaseClusterVector = typedef std::vector<CaseCluster>

Definition at line 86 of file SwitchLoweringUtils.h.

JumpTableBlock

using llvm::SwitchCG::JumpTableBlock = typedef std::pair<JumpTableHeader, JumpTable>

Definition at line 197 of file SwitchLoweringUtils.h.

SwitchWorkList

using llvm::SwitchCG::SwitchWorkList = typedef SmallVector<SwitchWorkListItem, 4>

Definition at line 251 of file SwitchLoweringUtils.h.

Enumeration Type Documentation

CaseClusterKind

enum llvm::SwitchCG::CaseClusterKind

Enumerator
CC_Range	A cluster of adjacent case labels with the same destination, or just one case.
CC_JumpTable	A cluster of cases suitable for jump table lowering.
CC_BitTests	A cluster of cases suitable for bit test lowering.

Definition at line 31 of file SwitchLoweringUtils.h.

Function Documentation

getJumpTableNumCases()

uint64_t llvm::SwitchCG::getJumpTableNumCases	(	const SmallVectorImpl< unsigned > &	TotalCases,
		unsigned	First,
		unsigned	Last
	)

Return the number of cases within a range.

Definition at line 37 of file SwitchLoweringUtils.cpp.

References assert(), llvm::First, and llvm::Last.

Referenced by llvm::SwitchCG::SwitchLowering::findJumpTables().

getJumpTableRange()

uint64_t llvm::SwitchCG::getJumpTableRange	(	const CaseClusterVector &	Clusters,
		unsigned	First,
		unsigned	Last
	)

Return the range of values within a range.

Definition at line 23 of file SwitchLoweringUtils.cpp.

References assert(), llvm::First, llvm::APInt::getBitWidth(), llvm::Last, and UINT64_MAX.

Referenced by llvm::SwitchCG::SwitchLowering::findJumpTables().

sortAndRangeify()

void llvm::SwitchCG::sortAndRangeify

(

CaseClusterVector &

Clusters

)

Sort Clusters and merge adjacent cases.

Definition at line 466 of file SwitchLoweringUtils.cpp.

References assert(), CC, llvm::ConstantInt::getValue(), llvm::SwitchCG::CaseCluster::Low, MBB, N, and llvm::sort().