diff options
| -rw-r--r-- | include/llvm/Instructions.h | 5 | ||||
| -rw-r--r-- | lib/VMCore/Instructions.cpp | 16 |
2 files changed, 21 insertions, 0 deletions
diff --git a/include/llvm/Instructions.h b/include/llvm/Instructions.h index 8f3b24a1e6..2387739720 100644 --- a/include/llvm/Instructions.h +++ b/include/llvm/Instructions.h @@ -408,6 +408,11 @@ public: inline bool hasIndices() const { return getNumOperands() > 1; } + + /// hasAllZeroIndices - Return true if all of the indices of this GEP are + /// zeros. If so, the result pointer and the first operand have the same + /// value, just potentially different types. + bool hasAllZeroIndices() const; // Methods for support type inquiry through isa, cast, and dyn_cast: static inline bool classof(const GetElementPtrInst *) { return true; } diff --git a/lib/VMCore/Instructions.cpp b/lib/VMCore/Instructions.cpp index f6abd85202..bfda46d983 100644 --- a/lib/VMCore/Instructions.cpp +++ b/lib/VMCore/Instructions.cpp @@ -966,6 +966,22 @@ const Type* GetElementPtrInst::getIndexedType(const Type *Ptr, Value *Idx) { return PTy->getElementType(); } + +/// hasAllZeroIndices - Return true if all of the indices of this GEP are +/// zeros. If so, the result pointer and the first operand have the same +/// value, just potentially different types. +bool GetElementPtrInst::hasAllZeroIndices() const { + for (unsigned i = 1, e = getNumOperands(); i != e; ++i) { + if (ConstantInt *CI = dyn_cast<ConstantInt>(getOperand(i))) { + if (!CI->isZero()) return false; + } else { + return false; + } + } + return true; +} + + //===----------------------------------------------------------------------===// // ExtractElementInst Implementation //===----------------------------------------------------------------------===// |