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Allow isAllOnesValue testing on packed constants

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33146 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Laskey 2007-01-12 22:39:14 +00:00
parent 9f7f49caa4
commit fa30182eb8
2 changed files with 22 additions and 0 deletions
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6
include/llvm/Constants.h
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@ -358,6 +358,12 @@ public:
/// created as ConstantAggregateZero objects.
virtual bool isNullValue() const { return false; }
/// This function will return true iff every element in this packed constant
/// is set to all ones.
/// @returns true iff this constant's emements are all set to all ones.
/// @brief Determine if the value is all ones.
virtual bool isAllOnesValue() const;
virtual void destroyConstant();
virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);

16
lib/VMCore/Constants.cpp
View File

@ -1166,6 +1166,22 @@ void ConstantPacked::destroyConstant() {
destroyConstantImpl();
}
/// This function will return true iff every element in this packed constant
/// is set to all ones.
/// @returns true iff this constant's emements are all set to all ones.
/// @brief Determine if the value is all ones.
bool ConstantPacked::isAllOnesValue() const {
// Check out first element.
const Constant *Elt = getOperand(0);
const ConstantInt *CI = dyn_cast<ConstantInt>(Elt);
if (!CI || !CI->isAllOnesValue()) return false;
// Then make sure all remaining elements point to the same value.
for (unsigned I = 1, E = getNumOperands(); I < E; ++I) {
if (getOperand(I) != Elt) return false;
}
return true;
}
//---- ConstantPointerNull::get() implementation...
//