struct RegisterBankInfo::ValueMapping

Declaration

struct RegisterBankInfo::ValueMapping { /* full declaration omitted */ };

Description

Helper struct that represents how a value is mapped through different register banks. E.g., Let say we have a 32-bit add and a < 2 x 32-bit> vadd. We can expand the < 2 x 32-bit> add into 2 x 32-bit add. Currently the TableGen-like file would look like: With the array of pointer, we would have: Given that a PartialMapping is actually small, the code size impact is actually a degradation. Moreover the compile time will be hit by the additional indirection. If PartialMapping gets bigger we may reconsider.

Declared at: llvm/include/llvm/CodeGen/RegisterBankInfo.h:145

Member Variables

public const llvm::RegisterBankInfo::PartialMapping* BreakDown

How the value is broken down between the different register banks.

public unsigned int NumBreakDowns

Number of partial mapping to break down this value.

Method Overview

• public ValueMapping()
• public ValueMapping(const llvm::RegisterBankInfo::PartialMapping * BreakDown, unsigned int NumBreakDowns)
• public const llvm::RegisterBankInfo::PartialMapping * begin() const
• public void dump() const
• public const llvm::RegisterBankInfo::PartialMapping * end() const
• public bool isValid() const
• public bool partsAllUniform() const
• public void print(llvm::raw_ostream & OS) const
• public bool verify(unsigned int MeaningfulBitWidth) const

Methods

¶ValueMapping()

Description

The default constructor creates an invalid (isValid() == false) instance.

Declared at: llvm/include/llvm/CodeGen/RegisterBankInfo.h:154

¶ValueMapping(
    const llvm::RegisterBankInfo::PartialMapping*
        BreakDown,
    unsigned int NumBreakDowns)

Description

Initialize a ValueMapping with the given parameter.\p BreakDown needs to have a life time at least as long as this instance.

Declared at: llvm/include/llvm/CodeGen/RegisterBankInfo.h:159

Parameters

const llvm::RegisterBankInfo::PartialMapping* BreakDown

unsigned int NumBreakDowns

¶const llvm::RegisterBankInfo::PartialMapping*
begin() const

Description

Iterators through the PartialMappings.

Declared at: llvm/include/llvm/CodeGen/RegisterBankInfo.h:163

¶void dump() const

Description

Print this on dbgs() stream.

Declared at: llvm/include/llvm/CodeGen/RegisterBankInfo.h:181

¶const llvm::RegisterBankInfo::PartialMapping*
end() const

Declared at: llvm/include/llvm/CodeGen/RegisterBankInfo.h:164

¶bool isValid() const

Description

Check if this ValueMapping is valid.

Declared at: llvm/include/llvm/CodeGen/RegisterBankInfo.h:171

¶bool partsAllUniform() const

Declared at: llvm/include/llvm/CodeGen/RegisterBankInfo.h:168

Returns

true if all partial mappings are the same size and register bank.

¶void print(llvm::raw_ostream& OS) const

Description

Print this on \p OS;

Declared at: llvm/include/llvm/CodeGen/RegisterBankInfo.h:184

Parameters

llvm::raw_ostream& OS

¶bool verify(unsigned int MeaningfulBitWidth) const

Description

Verify that this mapping makes sense for a value of\p MeaningfulBitWidth.

Declared at: llvm/include/llvm/CodeGen/RegisterBankInfo.h:178

Parameters

unsigned int MeaningfulBitWidth

Returns

True is the check was successful.