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Add a SubclassOptionalData field to Value. See the doxygen comment for

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details.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76189 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-07-17 17:16:59 +00:00
parent 445c89a83c
commit 9491c16e14
2 changed files with 8 additions and 1 deletions
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6
include/llvm/Value.h
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@ -62,6 +62,12 @@ class Value {
const unsigned char SubclassID; // Subclass identifier (for isa/dyn_cast) const unsigned char SubclassID; // Subclass identifier (for isa/dyn_cast)
unsigned char HasValueHandle : 1; // Has a ValueHandle pointing to this? unsigned char HasValueHandle : 1; // Has a ValueHandle pointing to this?
protected: protected:
/// SubclassOptionalData - This member is similar to SubclassData, however it
/// is for holding information which may be used to aid optimization, but
/// which may be cleared to zero without affecting conservative
/// interpretation.
unsigned char SubclassOptionalData : 7;
/// SubclassData - This member is defined by this class, but is not used for /// SubclassData - This member is defined by this class, but is not used for
/// anything. Subclasses can use it to hold whatever state they find useful. /// anything. Subclasses can use it to hold whatever state they find useful.
/// This field is initialized to zero by the ctor. /// This field is initialized to zero by the ctor.

3
lib/VMCore/Value.cpp
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@ -40,7 +40,8 @@ static inline const Type *checkType(const Type *Ty) {
} }
Value::Value(const Type *ty, unsigned scid) Value::Value(const Type *ty, unsigned scid)
: SubclassID(scid), HasValueHandle(0), SubclassData(0), VTy(checkType(ty)), : SubclassID(scid), HasValueHandle(0), SubclassOptionalData(0),
SubclassData(0), VTy(checkType(ty)),
UseList(0), Name(0) { UseList(0), Name(0) {
if (isa<CallInst>(this) || isa<InvokeInst>(this)) if (isa<CallInst>(this) || isa<InvokeInst>(this))
assert((VTy->isFirstClassType() || VTy == Type::VoidTy || assert((VTy->isFirstClassType() || VTy == Type::VoidTy ||