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Simplify the ComputeLinearIndex logic and fix a few bugs.

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llvm-svn: 52516
This commit is contained in:
Dan Gohman 2008-06-20 00:53:00 +00:00
parent d61d67b75c
commit 826ad19523
1 changed files with 10 additions and 16 deletions
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26
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -100,37 +100,31 @@ static unsigned ComputeLinearIndex(const TargetLowering &TLI, const Type *Ty,
const unsigned *IndicesEnd,
unsigned CurIndex = 0) {
// Base case: We're done.
if (Indices == IndicesEnd)
if (Indices && Indices == IndicesEnd)
return CurIndex;
// Otherwise we need to recurse. A non-negative value is used to
// indicate the final result value; a negative value carries the
// complemented position to continue the search.
CurIndex = ~CurIndex;
// Given a struct type, recursively traverse the elements.
if (const StructType *STy = dyn_cast<StructType>(Ty)) {
for (StructType::element_iterator EI = STy->element_begin(),
for (StructType::element_iterator EB = STy->element_begin(),
EI = EB,
EE = STy->element_end();
EI != EE; ++EI) {
CurIndex = ComputeLinearIndex(TLI, *EI, Indices+1, IndicesEnd,
~CurIndex);
if ((int)CurIndex >= 0)
return CurIndex;
if (Indices && *Indices == unsigned(EI - EB))
return ComputeLinearIndex(TLI, *EI, Indices+1, IndicesEnd, CurIndex);
CurIndex = ComputeLinearIndex(TLI, *EI, 0, 0, CurIndex);
}
}
// Given an array type, recursively traverse the elements.
else if (const ArrayType *ATy = dyn_cast<ArrayType>(Ty)) {
const Type *EltTy = ATy->getElementType();
for (unsigned i = 0, e = ATy->getNumElements(); i != e; ++i) {
CurIndex = ComputeLinearIndex(TLI, EltTy, Indices+1, IndicesEnd,
~CurIndex);
if ((int)CurIndex >= 0)
return CurIndex;
if (Indices && *Indices == i)
return ComputeLinearIndex(TLI, EltTy, Indices+1, IndicesEnd, CurIndex);
CurIndex = ComputeLinearIndex(TLI, EltTy, 0, 0, CurIndex);
}
}
// We haven't found the type we're looking for, so keep searching.
return CurIndex;
return CurIndex + 1;
}
/// ComputeValueVTs - Given an LLVM IR type, compute a sequence of