llvm::SMEAttrs Class Reference

SMEAttrs is a utility class to parse the SME ACLE attributes on functions. More...

#include "Target/AArch64/Utils/AArch64SMEAttributes.h"

Public Types
enum	Mask {   Normal = 0 , SM_Enabled = 1 << 0 , SM_Compatible = 1 << 1 , SM_Body = 1 << 2 ,   ZA_Shared = 1 << 3 , ZA_New = 1 << 4 , ZA_Preserved = 1 << 5 , ZA_NoLazySave = 1 << 6 ,   All = ZA_Preserved - 1 }

Public Member Functions
	SMEAttrs (unsigned Mask=Normal)
	SMEAttrs (const Function &F)
	SMEAttrs (const CallBase &CB)
	SMEAttrs (const AttributeList &L)
	SMEAttrs (StringRef FuncName)
void	set (unsigned M, bool Enable=true)
bool	hasStreamingBody () const
bool	hasStreamingInterface () const
bool	hasStreamingInterfaceOrBody () const
bool	hasStreamingCompatibleInterface () const
bool	hasNonStreamingInterface () const
bool	hasNonStreamingInterfaceAndBody () const
std::optional< bool >	requiresSMChange (const SMEAttrs &Callee, bool BodyOverridesInterface=false) const
bool	hasNewZABody () const
bool	hasSharedZAInterface () const
bool	hasPrivateZAInterface () const
bool	preservesZA () const
bool	hasZAState () const
bool	requiresLazySave (const SMEAttrs &Callee) const

Detailed Description

SMEAttrs is a utility class to parse the SME ACLE attributes on functions.

It helps determine a function's requirements for PSTATE.ZA and PSTATE.SM. It has interfaces to query whether a streaming mode change or lazy-save mechanism is required when going from one function to another (e.g. through a call).

Definition at line 25 of file AArch64SMEAttributes.h.

Member Enumeration Documentation

Mask

enum llvm::SMEAttrs::Mask

Enumerator
Normal
SM_Enabled
SM_Compatible
SM_Body
ZA_Shared
ZA_New
ZA_Preserved
ZA_NoLazySave
All

Definition at line 30 of file AArch64SMEAttributes.h.

Constructor & Destructor Documentation

SMEAttrs() [1/5]

llvm::SMEAttrs::SMEAttrs ( unsigned  Mask = Normal )

inline

Definition at line 42 of file AArch64SMEAttributes.h.

References set().

SMEAttrs() [2/5]

llvm::SMEAttrs::SMEAttrs ( const Function &  F )

inline

Definition at line 43 of file AArch64SMEAttributes.h.

SMEAttrs() [3/5]

SMEAttrs::SMEAttrs

(

const CallBase &

CB

)

Definition at line 33 of file AArch64SMEAttributes.cpp.

References F, llvm::CallBase::getAttributes(), llvm::CallBase::getCalledFunction(), and set().

SMEAttrs() [4/5]

SMEAttrs::SMEAttrs

(

const AttributeList &

L

)

Definition at line 49 of file AArch64SMEAttributes.cpp.

References SM_Body, SM_Compatible, SM_Enabled, ZA_New, ZA_Preserved, and ZA_Shared.

SMEAttrs() [5/5]

SMEAttrs::SMEAttrs

(

StringRef

FuncName

)

Definition at line 40 of file AArch64SMEAttributes.cpp.

References SM_Compatible, ZA_NoLazySave, ZA_Preserved, and ZA_Shared.

Member Function Documentation

hasNewZABody()

bool llvm::SMEAttrs::hasNewZABody ( ) const

inline

Definition at line 78 of file AArch64SMEAttributes.h.

References ZA_New.

Referenced by llvm::AArch64TTIImpl::areInlineCompatible(), hasZAState(), and set().

hasNonStreamingInterface()

bool llvm::SMEAttrs::hasNonStreamingInterface ( ) const

inline

Definition at line 59 of file AArch64SMEAttributes.h.

References hasStreamingCompatibleInterface(), and hasStreamingInterface().

Referenced by hasNonStreamingInterfaceAndBody().

hasNonStreamingInterfaceAndBody()

bool llvm::SMEAttrs::hasNonStreamingInterfaceAndBody ( ) const

inline

Definition at line 62 of file AArch64SMEAttributes.h.

References hasNonStreamingInterface(), and hasStreamingBody().

Referenced by requiresSMChange().

hasPrivateZAInterface()

bool llvm::SMEAttrs::hasPrivateZAInterface ( ) const

inline

Definition at line 80 of file AArch64SMEAttributes.h.

References hasSharedZAInterface().

hasSharedZAInterface()

bool llvm::SMEAttrs::hasSharedZAInterface ( ) const

inline

Definition at line 79 of file AArch64SMEAttributes.h.

References ZA_Shared.

Referenced by hasPrivateZAInterface(), hasZAState(), and set().

hasStreamingBody()

bool llvm::SMEAttrs::hasStreamingBody ( ) const

inline

Definition at line 51 of file AArch64SMEAttributes.h.

References SM_Body.

Referenced by hasNonStreamingInterfaceAndBody(), and hasStreamingInterfaceOrBody().

hasStreamingCompatibleInterface()

bool llvm::SMEAttrs::hasStreamingCompatibleInterface ( ) const

inline

Definition at line 56 of file AArch64SMEAttributes.h.

References SM_Compatible.

Referenced by llvm::AArch64::createFastISel(), hasNonStreamingInterface(), and set().

hasStreamingInterface()

bool llvm::SMEAttrs::hasStreamingInterface ( ) const

inline

Definition at line 52 of file AArch64SMEAttributes.h.

References SM_Enabled.

Referenced by hasNonStreamingInterface(), hasStreamingInterfaceOrBody(), and set().

hasStreamingInterfaceOrBody()

bool llvm::SMEAttrs::hasStreamingInterfaceOrBody ( ) const

inline

Definition at line 53 of file AArch64SMEAttributes.h.

References hasStreamingBody(), and hasStreamingInterface().

Referenced by llvm::AArch64::createFastISel(), and requiresSMChange().

hasZAState()

bool llvm::SMEAttrs::hasZAState ( ) const

inline

Definition at line 82 of file AArch64SMEAttributes.h.

References hasNewZABody(), and hasSharedZAInterface().

Referenced by llvm::AArch64::createFastISel(), and requiresLazySave().

preservesZA()

bool llvm::SMEAttrs::preservesZA ( ) const

inline

Definition at line 81 of file AArch64SMEAttributes.h.

References ZA_Preserved.

Referenced by set().

requiresLazySave()

bool llvm::SMEAttrs::requiresLazySave ( const SMEAttrs &  Callee ) const

inline

Definition at line 85 of file AArch64SMEAttributes.h.

References hasZAState(), and ZA_NoLazySave.

Referenced by llvm::AArch64TTIImpl::areInlineCompatible().

requiresSMChange()

std::optional< bool > SMEAttrs::requiresSMChange	(	const SMEAttrs &	Callee,
		bool	BodyOverridesInterface = false
	)		const

Returns

true if a call from Caller -> Callee requires a change in streaming mode. If BodyOverridesInterface is true and Callee has a streaming body, then requiresSMChange considers a call to Callee as having a Streaming interface. This can be useful when considering e.g. inlining, where we explicitly want the body to overrule the interface (because after inlining the interface is no longer relevant).

Definition at line 66 of file AArch64SMEAttributes.cpp.

References hasNonStreamingInterfaceAndBody(), and hasStreamingInterfaceOrBody().

Referenced by llvm::AArch64TTIImpl::areInlineCompatible(), and llvm::AArch64TTIImpl::getInlineCallPenalty().

set()

void SMEAttrs::set	(	unsigned	M,
		bool	Enable = true
	)

Definition at line 15 of file AArch64SMEAttributes.cpp.

References assert(), llvm::Enable, hasNewZABody(), hasSharedZAInterface(), hasStreamingCompatibleInterface(), hasStreamingInterface(), preservesZA(), and ZA_NoLazySave.

Referenced by SMEAttrs().

---

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

• lib/Target/AArch64/Utils/AArch64SMEAttributes.h
• lib/Target/AArch64/Utils/AArch64SMEAttributes.cpp