#include "CGCXXABI.h"
#include "CGObjCRuntime.h"
#include "CodeGenFunction.h"
#include "CodeGenModule.h"
#include "ConstantEmitter.h"
#include "TargetInfo.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/Attr.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/StmtVisitor.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Intrinsics.h"

Enumerations
enum	CompareKind { CK_Less , CK_Greater , CK_Equal }

Functions
static bool	isTrivialFiller (Expr *E)
	Determine if E is a trivial array filler, that is, one that is equivalent to zero-initialization.

static Expr *	findPeephole (Expr *op, CastKind kind, const ASTContext &ctx)
	Attempt to look through various unimportant expressions to find a cast of the given kind.

static llvm::Value *	EmitCompare (CGBuilderTy &Builder, CodeGenFunction &CGF, const BinaryOperator E, llvm::Value LHS, llvm::Value RHS, CompareKind Kind, const char NameSuffix="")

static bool	isBlockVarRef (const Expr *E)
	Is the value of the given expression possibly a reference to or into a __block variable?

static bool	castPreservesZero (const CastExpr *CE)
	Determine whether the given cast kind is known to always convert values with all zero bits in their value representation to values with all zero bits in their value representation.

static bool	isSimpleZero (const Expr *E, CodeGenFunction &CGF)
	isSimpleZero - If emitting this value will obviously just cause a store of zero to memory, return true.

static CharUnits	GetNumNonZeroBytesInInit (const Expr *E, CodeGenFunction &CGF)
	GetNumNonZeroBytesInInit - Get an approximate count of the number of non-zero bytes that will be stored when outputting the initializer for the specified initializer expression.

static void	CheckAggExprForMemSetUse (AggValueSlot &Slot, const Expr *E, CodeGenFunction &CGF)
	CheckAggExprForMemSetUse - If the initializer is large and has a lot of zeros in it, emit a memset and avoid storing the individual zeros.

Enumeration Type Documentation

◆ CompareKind

enum CompareKind

Enumerator
CK_Less
CK_Greater
CK_Equal

Definition at line 974 of file CGExprAgg.cpp.

Function Documentation

◆ castPreservesZero()

static bool castPreservesZero ( const CastExpr * CE )

static

Determine whether the given cast kind is known to always convert values with all zero bits in their value representation to values with all zero bits in their value representation.

Definition at line 1423 of file CGExprAgg.cpp.

References clang::CastExpr::getCastKind().

Referenced by isSimpleZero().

◆ CheckAggExprForMemSetUse()

static void CheckAggExprForMemSetUse	(	AggValueSlot &	Slot,
		const Expr *	E,
		CodeGenFunction &	CGF
	)

static

CheckAggExprForMemSetUse - If the initializer is large and has a lot of zeros in it, emit a memset and avoid storing the individual zeros.

Definition at line 1997 of file CGExprAgg.cpp.

References clang::CodeGen::CodeGenFunction::Builder, clang::CodeGen::CGBuilderTy::CreateElementBitCast(), clang::CodeGen::CGBuilderTy::CreateMemSet(), clang::CharUnits::fromQuantity(), clang::CodeGen::AggValueSlot::getAddress(), clang::Type::getAs(), clang::ASTContext::getBaseElementType(), clang::CodeGen::CodeGenFunction::getContext(), clang::CodeGen::CodeGenFunction::getLangOpts(), GetNumNonZeroBytesInInit(), clang::CodeGen::AggValueSlot::getPreferredSize(), clang::Expr::getType(), clang::CXXRecordDecl::hasUserDeclaredConstructor(), clang::CodeGen::CodeGenTypeCache::Int8Ty, clang::CodeGen::Address::isValid(), clang::CodeGen::AggValueSlot::isVolatile(), clang::CodeGen::AggValueSlot::isZeroed(), and clang::CodeGen::AggValueSlot::setZeroed().

◆ EmitCompare()

static llvm::Value * EmitCompare	(	CGBuilderTy &	Builder,
		CodeGenFunction &	CGF,
		const BinaryOperator *	E,
		llvm::Value *	LHS,
		llvm::Value *	RHS,
		CompareKind	Kind,
		const char *	NameSuffix = `""`
	)

static

Definition at line 980 of file CGExprAgg.cpp.

References clang::CodeGen::CodeGenFunction::CGM, CK_Equal, CK_Greater, CK_Less, clang::CodeGen::CGCXXABI::EmitMemberPointerComparison(), clang::Type::getAs(), clang::CodeGen::CodeGenModule::getCXXABI(), clang::BinaryOperator::getLHS(), clang::Expr::getType(), clang::Type::hasFloatingRepresentation(), clang::Type::hasSignedIntegerRepresentation(), clang::Type::isIntegralOrEnumerationType(), and clang::Type::isPointerType().

◆ findPeephole()

static Expr * findPeephole	(	Expr *	op,
		CastKind	kind,
		const ASTContext &	ctx
	)

static

Attempt to look through various unimportant expressions to find a cast of the given kind.

Definition at line 715 of file CGExprAgg.cpp.

References clang::Expr::IgnoreParenNoopCasts().

◆ GetNumNonZeroBytesInInit()

static CharUnits GetNumNonZeroBytesInInit	(	const Expr *	E,
		CodeGenFunction &	CGF
	)

static

GetNumNonZeroBytesInInit - Get an approximate count of the number of non-zero bytes that will be stored when outputting the initializer for the specified initializer expression.

Definition at line 1935 of file CGExprAgg.cpp.

References clang::RecordDecl::fields(), clang::Type::getAs(), clang::CodeGen::CodeGenFunction::getContext(), clang::InitListExpr::getInit(), clang::InitListExpr::getNumInits(), GetNumNonZeroBytesInInit(), clang::TargetInfo::getPointerWidth(), clang::CodeGen::CodeGenFunction::getTarget(), clang::Expr::getType(), clang::CodeGen::CodeGenFunction::getTypes(), clang::ASTContext::getTypeSizeInChars(), clang::Expr::IgnoreParenNoopCasts(), isSimpleZero(), clang::InitListExpr::isTransparent(), clang::CodeGen::CodeGenTypes::isZeroInitializable(), clang::ASTContext::toCharUnitsFromBits(), and clang::CharUnits::Zero().