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VMCore support for the insertelement operation.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25408 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Robert Bocchino
2006-01-17 20:07:22 +00:00
parent 956fd7254f
commit c152f9cd26
7 changed files with 150 additions and 9 deletions
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57
lib/VMCore/ConstantFold.cpp
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@@ -734,6 +734,63 @@ Constant *llvm::ConstantFoldExtractElementInstruction(const Constant *Val,
return 0;
}
Constant *llvm::ConstantFoldInsertElementInstruction(const Constant *Val,
const Constant *Elt,
const Constant *Idx) {
const ConstantUInt *CIdx = dyn_cast<ConstantUInt>(Idx);
if (!CIdx) return 0;
unsigned idxVal = CIdx->getValue();
if (const UndefValue *UVal = dyn_cast<UndefValue>(Val)) {
// Insertion of scalar constant into packed undef
// Optimize away insertion of undef
if (isa<UndefValue>(Elt))
return const_cast<Constant*>(Val);
// Otherwise break the aggregate undef into multiple undefs and do
// the insertion
unsigned numOps =
cast<PackedType>(Val->getType())->getNumElements();
std::vector<Constant*> Ops;
Ops.reserve(numOps);
for (unsigned i = 0; i < numOps; ++i) {
const Constant *Op =
(i == idxVal) ? Elt : UndefValue::get(Elt->getType());
Ops.push_back(const_cast<Constant*>(Op));
}
return ConstantPacked::get(Ops);
}
if (const ConstantAggregateZero *CVal =
dyn_cast<ConstantAggregateZero>(Val)) {
// Insertion of scalar constant into packed aggregate zero
// Optimize away insertion of zero
if (Elt->isNullValue())
return const_cast<Constant*>(Val);
// Otherwise break the aggregate zero into multiple zeros and do
// the insertion
unsigned numOps =
cast<PackedType>(Val->getType())->getNumElements();
std::vector<Constant*> Ops;
Ops.reserve(numOps);
for (unsigned i = 0; i < numOps; ++i) {
const Constant *Op =
(i == idxVal) ? Elt : Constant::getNullValue(Elt->getType());
Ops.push_back(const_cast<Constant*>(Op));
}
return ConstantPacked::get(Ops);
}
if (const ConstantPacked *CVal = dyn_cast<ConstantPacked>(Val)) {
// Insertion of scalar constant into packed constant
std::vector<Constant*> Ops;
Ops.reserve(CVal->getNumOperands());
for (unsigned i = 0; i < CVal->getNumOperands(); ++i) {
const Constant *Op =
(i == idxVal) ? Elt : cast<Constant>(CVal->getOperand(i));
Ops.push_back(const_cast<Constant*>(Op));
}
return ConstantPacked::get(Ops);
}
return 0;
}
/// isZeroSizedType - This type is zero sized if its an array or structure of
/// zero sized types. The only leaf zero sized type is an empty structure.
static bool isMaybeZeroSizedType(const Type *Ty) {