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Implement: Assembler/2004-01-11-getelementptrfolding.llx

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10759 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-01-11 23:56:33 +00:00
parent c9f75b5700
commit 952454dbff
1 changed files with 8 additions and 6 deletions
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14
lib/VMCore/ConstantFold.cpp
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@ -171,7 +171,7 @@ Constant *llvm::ConstantFoldGetElementPtr(const Constant *C,
I != E; ++I)
LastTy = *I;
if (LastTy && isa<ArrayType>(LastTy)) {
if ((LastTy && isa<ArrayType>(LastTy)) || IdxList[0]->isNullValue()) {
std::vector<Constant*> NewIndices;
NewIndices.reserve(IdxList.size() + CE->getNumOperands());
for (unsigned i = 1, e = CE->getNumOperands()-1; i != e; ++i)
@ -179,11 +179,13 @@ Constant *llvm::ConstantFoldGetElementPtr(const Constant *C,
// Add the last index of the source with the first index of the new GEP.
// Make sure to handle the case when they are actually different types.
Constant *Combined =
ConstantExpr::get(Instruction::Add,
ConstantExpr::getCast(IdxList[0], Type::LongTy),
ConstantExpr::getCast(CE->getOperand(CE->getNumOperands()-1), Type::LongTy));
Constant *Combined = CE->getOperand(CE->getNumOperands()-1);
if (!IdxList[0]->isNullValue()) // Otherwise it must be an array
Combined =
ConstantExpr::get(Instruction::Add,
ConstantExpr::getCast(IdxList[0], Type::LongTy),
ConstantExpr::getCast(Combined, Type::LongTy));
NewIndices.push_back(Combined);
NewIndices.insert(NewIndices.end(), IdxList.begin()+1, IdxList.end());
return ConstantExpr::getGetElementPtr(CE->getOperand(0), NewIndices);