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add GetElementPtrInst::hasAllZeroIndices, a long-overdue helper method.

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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
This commit is contained in:
Chris Lattner 2007-04-14 00:12:57 +00:00
parent 0468ab3025
commit 6f771d4351
2 changed files with 21 additions and 0 deletions
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5
include/llvm/Instructions.h
View File

@ -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; }

16
lib/VMCore/Instructions.cpp
View File

@ -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
//===----------------------------------------------------------------------===//