LLVM: llvm::CombinerInfo Struct Reference (original) (raw)

#include "[llvm/CodeGen/GlobalISel/CombinerInfo.h](CombinerInfo%5F8h%5Fsource.html)"

Public Types
enum class	ObserverLevel { Basic, DCE, SinglePass }

Public Attributes
bool	IllegalOpsAllowed
	If IllegalOpsAllowed is false, the CombinerHelper will make use of the legalizerInfo to check for legality before each transformation.
bool	LegalizeIllegalOps
	If LegalizeIllegalOps is true, the Combiner will also legalize the illegal ops that are created.
const LegalizerInfo *	LInfo
bool	EnableOpt
	Whether optimizations should be enabled.
bool	EnableOptSize
	Whether we're optimizing for size.
bool	EnableMinSize
	Whether we're optimizing for minsize (-Oz).
unsigned	MaxIterations = 0
	The maximum number of times the Combiner will iterate over the MachineFunction.
ObserverLevel	ObserverLvl = ObserverLevel::Basic
	Select how the Combiner acts on MIR changes.
bool	EnableFullDCE = true
	Whether dead code elimination is performed before each Combiner iteration.

Definition at line 24 of file CombinerInfo.h.

◆ ObserverLevel

Enumerator
Basic	Only retry combining created/changed instructions. This replicates the legacy default Observer behavior for use with fixed-point iteration.
DCE	Enables Observer-based detection of dead instructions. This can save some compile-time if full disabling of fixed-point iteration is not desired. If the input IR doesn't contain dead instructions, consider disabling EnableFullDCE.
SinglePass	Enables Observer-based DCE and additional heuristics that retry combining defined and used instructions of modified instructions. This provides a good balance between compile-time and completeness of combining without needing fixed-point iteration.

Definition at line 57 of file CombinerInfo.h.

virtual llvm::CombinerInfo::~CombinerInfo ( )	virtualdefault

bool llvm::CombinerInfo::EnableFullDCE = true

Whether dead code elimination is performed before each Combiner iteration.

If Observer-based DCE is enabled, this controls if a full DCE pass is performed before the first Combiner iteration.

Definition at line 80 of file CombinerInfo.h.

bool llvm::CombinerInfo::EnableMinSize

bool llvm::CombinerInfo::EnableOpt

Whether optimizations should be enabled.

This is to distinguish between uses of the combiner unconditionally and only when optimizations are specifically enabled/

Definition at line 47 of file CombinerInfo.h.

Referenced by CombinerInfo().

bool llvm::CombinerInfo::EnableOptSize

bool llvm::CombinerInfo::IllegalOpsAllowed

bool llvm::CombinerInfo::LegalizeIllegalOps

unsigned llvm::CombinerInfo::MaxIterations = 0

ObserverLevel llvm::CombinerInfo::ObserverLvl = ObserverLevel::Basic

The documentation for this struct was generated from the following file: