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add GetElementPtrInst::hasAllZeroIndices, a long-overdue helper method.
Writing it twice in the same day was too much for me. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35978 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -408,6 +408,11 @@ public:
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inline bool hasIndices() const {
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return getNumOperands() > 1;
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}
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/// hasAllZeroIndices - Return true if all of the indices of this GEP are
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/// zeros. If so, the result pointer and the first operand have the same
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/// value, just potentially different types.
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bool hasAllZeroIndices() const;
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// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const GetElementPtrInst *) { return true; }
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@ -966,6 +966,22 @@ const Type* GetElementPtrInst::getIndexedType(const Type *Ptr, Value *Idx) {
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return PTy->getElementType();
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}
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/// hasAllZeroIndices - Return true if all of the indices of this GEP are
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/// zeros. If so, the result pointer and the first operand have the same
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/// value, just potentially different types.
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bool GetElementPtrInst::hasAllZeroIndices() const {
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for (unsigned i = 1, e = getNumOperands(); i != e; ++i) {
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if (ConstantInt *CI = dyn_cast<ConstantInt>(getOperand(i))) {
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if (!CI->isZero()) return false;
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} else {
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return false;
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}
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}
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return true;
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}
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//===----------------------------------------------------------------------===//
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// ExtractElementInst Implementation
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//===----------------------------------------------------------------------===//
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