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Make clever use of padding to shrink IntegerLiterals. 

Inheritance allows us to use padding across classes.
40 -> 32 bytes on x86_64.

llvm-svn: 151499
This commit is contained in:
Benjamin Kramer 2012-02-26 18:34:12 +00:00
parent 74f011db76
commit 441607ddcb
1 changed files with 4 additions and 7 deletions
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11
clang/include/clang/AST/Expr.h
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@ -1085,11 +1085,11 @@ public:
/// the APFloat/APInt values will never get freed. APNumericStorage uses /// the APFloat/APInt values will never get freed. APNumericStorage uses
/// ASTContext's allocator for memory allocation. /// ASTContext's allocator for memory allocation.
class APNumericStorage { class APNumericStorage {
unsigned BitWidth;
union { union {
uint64_t VAL; ///< Used to store the <= 64 bits integer value. uint64_t VAL; ///< Used to store the <= 64 bits integer value.
uint64_t *pVal; ///< Used to store the >64 bits integer value. uint64_t *pVal; ///< Used to store the >64 bits integer value.
}; };
unsigned BitWidth;
bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; }
@ -1097,7 +1097,7 @@ class APNumericStorage {
APNumericStorage& operator=(const APNumericStorage&); // do not implement APNumericStorage& operator=(const APNumericStorage&); // do not implement
protected: protected:
APNumericStorage() : BitWidth(0), VAL(0) { } APNumericStorage() : VAL(0), BitWidth(0) { }
llvm::APInt getIntValue() const { llvm::APInt getIntValue() const {
unsigned NumWords = llvm::APInt::getNumWords(BitWidth); unsigned NumWords = llvm::APInt::getNumWords(BitWidth);
@ -1109,7 +1109,7 @@ protected:
void setIntValue(ASTContext &C, const llvm::APInt &Val); void setIntValue(ASTContext &C, const llvm::APInt &Val);
}; };
class APIntStorage : public APNumericStorage { class APIntStorage : private APNumericStorage {
public: public:
llvm::APInt getValue() const { return getIntValue(); } llvm::APInt getValue() const { return getIntValue(); }
void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); } void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); }
@ -1125,8 +1125,7 @@ public:
} }
}; };
class IntegerLiteral : public Expr { class IntegerLiteral : public Expr, public APIntStorage {
APIntStorage Num;
SourceLocation Loc; SourceLocation Loc;
/// \brief Construct an empty integer literal. /// \brief Construct an empty integer literal.
@ -1156,13 +1155,11 @@ public:
/// \brief Returns a new empty integer literal. /// \brief Returns a new empty integer literal.
static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty); static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty);
llvm::APInt getValue() const { return Num.getValue(); }
SourceRange getSourceRange() const { return SourceRange(Loc); } SourceRange getSourceRange() const { return SourceRange(Loc); }
/// \brief Retrieve the location of the literal. /// \brief Retrieve the location of the literal.
SourceLocation getLocation() const { return Loc; } SourceLocation getLocation() const { return Loc; }
void setValue(ASTContext &C, const llvm::APInt &Val) { Num.setValue(C, Val); }
void setLocation(SourceLocation Location) { Loc = Location; } void setLocation(SourceLocation Location) { Loc = Location; }
static bool classof(const Stmt *T) { static bool classof(const Stmt *T) {