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SImplify ConstantVector::get a bit and make it turn a vector

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of all undefs into a single undef value.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53384 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-07-10 00:44:03 +00:00
parent fea85c46c0
commit 7cc9a4b990
1 changed files with 18 additions and 8 deletions
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26
lib/VMCore/Constants.cpp
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@ -1498,16 +1498,26 @@ static ManagedStatic<ValueMap<std::vector<Constant*>, VectorType,
Constant *ConstantVector::get(const VectorType *Ty,
const std::vector<Constant*> &V) {
// If this is an all-zero vector, return a ConstantAggregateZero object
if (!V.empty()) {
Constant *C = V[0];
if (!C->isNullValue())
return VectorConstants->getOrCreate(Ty, V);
assert(!V.empty() && "Vectors can't be empty");
// If this is an all-undef or alll-zero vector, return a
// ConstantAggregateZero or UndefValue.
Constant *C = V[0];
bool isZero = C->isNullValue();
bool isUndef = isa<UndefValue>(C);
if (isZero || isUndef) {
for (unsigned i = 1, e = V.size(); i != e; ++i)
if (V[i] != C)
return VectorConstants->getOrCreate(Ty, V);
if (V[i] != C) {
isZero = isUndef = false;
break;
}
}
return ConstantAggregateZero::get(Ty);
if (isZero)
return ConstantAggregateZero::get(Ty);
if (isUndef)
return UndefValue::get(Ty);
return VectorConstants->getOrCreate(Ty, V);
}
Constant *ConstantVector::get(const std::vector<Constant*> &V) {