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* Implement fully general merging of array subscripts on demand! This

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does not handle the initial pointer index case yet though.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4012 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2002-10-02 06:24:36 +00:00
parent 27236ac089
commit e03f32bcc2
1 changed files with 27 additions and 3 deletions
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30
lib/Analysis/DataStructure/Local.cpp
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@ -283,10 +283,34 @@ void GraphBuilder::visitGetElementPtrInst(GetElementPtrInst &GEP) {
for (unsigned i = 1, e = GEP.getNumOperands(); i != e; ++i)
if (GEP.getOperand(i)->getType() == Type::LongTy) {
if (GEP.getOperand(i) != Constant::getNullValue(Type::LongTy)) {
std::cerr << "Array indexing not handled yet!\n";
// Get the type indexing into...
const SequentialType *STy = cast<SequentialType>(CurTy);
CurTy = STy->getElementType();
if (ConstantSInt *CS = dyn_cast<ConstantSInt>(GEP.getOperand(i))) {
if (isa<PointerType>(STy))
std::cerr << "Pointer indexing not handled yet!\n";
else
Offset += CS->getValue()*TD.getTypeSize(CurTy);
} else {
// Variable index into a node. We must merge all of the elements of the
// sequential type here.
if (isa<PointerType>(STy))
std::cerr << "Pointer indexing not handled yet!\n";
else {
const ArrayType *ATy = cast<ArrayType>(STy);
unsigned ElSize = TD.getTypeSize(CurTy);
DSNode *N = Value.getNode();
assert(N && "Value must have a node!");
unsigned RawOffset = Offset+Value.getOffset();
// Loop over all of the elements of the array, merging them into the
// zero'th element.
for (unsigned i = 1, e = ATy->getNumElements(); i != e; ++i)
// Merge all of the byte components of this array element
for (unsigned j = 0; j != ElSize; ++j)
N->mergeIndexes(RawOffset+j, RawOffset+i*ElSize+j);
}
}
CurTy = cast<SequentialType>(CurTy)->getElementType();
} else if (GEP.getOperand(i)->getType() == Type::UByteTy) {
unsigned FieldNo = cast<ConstantUInt>(GEP.getOperand(i))->getValue();
const StructType *STy = cast<StructType>(CurTy);