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If a long double is in a packed struct, it may be

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that there is no padding.

llvm-svn: 43691
This commit is contained in:
Duncan Sands 2007-11-05 00:35:07 +00:00
parent 6c2e7e090b
commit 7c0f410b42
1 changed files with 7 additions and 5 deletions
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12
lib/Transforms/Scalar/ScalarReplAggregates.cpp
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@ -733,7 +733,8 @@ void SROA::RewriteBitCastUserOfAlloca(Instruction *BCInst, AllocationInst *AI,
/// HasPadding - Return true if the specified type has any structure or
/// alignment padding, false otherwise.
static bool HasPadding(const Type *Ty, const TargetData &TD) {
static bool HasPadding(const Type *Ty, const TargetData &TD,
bool inPacked = false) {
if (const StructType *STy = dyn_cast<StructType>(Ty)) {
const StructLayout *SL = TD.getStructLayout(STy);
unsigned PrevFieldBitOffset = 0;
@ -741,7 +742,7 @@ static bool HasPadding(const Type *Ty, const TargetData &TD) {
unsigned FieldBitOffset = SL->getElementOffsetInBits(i);
// Padding in sub-elements?
if (HasPadding(STy->getElementType(i), TD))
if (HasPadding(STy->getElementType(i), TD, STy->isPacked()))
return true;
// Check to see if there is any padding between this element and the
@ -765,11 +766,12 @@ static bool HasPadding(const Type *Ty, const TargetData &TD) {
}
} else if (const ArrayType *ATy = dyn_cast<ArrayType>(Ty)) {
return HasPadding(ATy->getElementType(), TD);
return HasPadding(ATy->getElementType(), TD, false);
} else if (const VectorType *VTy = dyn_cast<VectorType>(Ty)) {
return HasPadding(VTy->getElementType(), TD);
return HasPadding(VTy->getElementType(), TD, false);
}
return TD.getTypeSizeInBits(Ty) != TD.getABITypeSizeInBits(Ty);
return inPacked ?
false : TD.getTypeSizeInBits(Ty) != TD.getABITypeSizeInBits(Ty);
}
/// isSafeStructAllocaToScalarRepl - Check to see if the specified allocation of