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Add a new helper method to Value to strip in-bounds constant offsets of

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pointers, but accumulate the offset into an APInt in the process of
stripping it.

This is a pretty handy thing to have, such as when trying to determine
if two pointers are at some constant relative offset. I'll be committing
a patch shortly to use it for exactly that purpose.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189000 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth
2013-08-22 11:25:11 +00:00
parent 4efbeb2700
commit f73826bef0
2 changed files with 65 additions and 12 deletions
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43
include/llvm/IR/Value.h
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@@ -22,26 +22,29 @@
namespace llvm {
class Constant;
class APInt;
class Argument;
class Instruction;
class AssemblyAnnotationWriter;
class BasicBlock;
class GlobalValue;
class Constant;
class DataLayout;
class Function;
class GlobalVariable;
class GlobalAlias;
class GlobalValue;
class GlobalVariable;
class InlineAsm;
class Instruction;
class LLVMContext;
class MDNode;
class StringRef;
class Twine;
class Type;
class ValueHandleBase;
class ValueSymbolTable;
class raw_ostream;
template<typename ValueTy> class StringMapEntry;
typedef StringMapEntry<Value*> ValueName;
class raw_ostream;
class AssemblyAnnotationWriter;
class ValueHandleBase;
class LLVMContext;
class Twine;
class MDNode;
class Type;
class StringRef;
//===----------------------------------------------------------------------===//
// Value Class
@@ -287,6 +290,22 @@ public:
return const_cast<Value*>(this)->stripInBoundsConstantOffsets();
}
/// \brief Strips like \c stripInBoundsConstantOffsets but also accumulates
/// the constant offset stripped.
///
/// Stores the resulting constant offset stripped into the APInt provided.
/// The provided APInt will be extended or truncated as needed to be the
/// correct bitwidth for an offset of this pointer type.
///
/// If this is called on a non-pointer value, it returns 'this'.
Value *stripAndAccumulateInBoundsConstantOffsets(const DataLayout &DL,
APInt &Offset);
const Value *stripAndAccumulateInBoundsConstantOffsets(const DataLayout &DL,
APInt &Offset) const {
return const_cast<Value *>(this)
->stripAndAccumulateInBoundsConstantOffsets(DL, Offset);
}
/// \brief Strips off unneeded pointer casts and any in-bounds offsets from
/// the specified value, returning the original pointer value.
///