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Hoist the GEP constant address offset computation to a common home on

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the GEP instruction class.

This is part of the continued refactoring and cleaning of the
infrastructure used by SROA. This particular operation is also done in
a few other places which I'll try to refactor to share this
implementation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169852 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth
2012-12-11 10:29:10 +00:00
parent 05749cff9b
commit 4ced4ee94b
4 changed files with 46 additions and 25 deletions
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13
include/llvm/Instructions.h
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@@ -29,9 +29,10 @@
namespace llvm {
class APInt;
class ConstantInt;
class ConstantRange;
class APInt;
class DataLayout;
class LLVMContext;
enum AtomicOrdering {
@@ -850,6 +851,16 @@ public:
/// isInBounds - Determine whether the GEP has the inbounds flag.
bool isInBounds() const;
/// \brief Accumulate the constant address offset of this GEP if possible.
///
/// This routine accepts an APInt into which it will accumulate the constant
/// offset of this GEP if the GEP is in fact constant. If the GEP is not
/// all-constant, it returns false and the value of the offset APInt is
/// undefined (it is *not* preserved!). The APInt passed into this routine
/// must be at least as wide as the IntPtr type for the address space of
/// the base GEP pointer.
bool accumulateConstantOffset(const DataLayout &DL, APInt &Offset) const;
// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const Instruction *I) {
return (I->getOpcode() == Instruction::GetElementPtr);