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Have functions return structures smaller than 128-bit in registers if ABI 

is either N32 or N64. 

llvm-svn: 147520
This commit is contained in:
Akira Hatanaka 2012-01-04 03:34:42 +00:00
parent 3b775b8cc3
commit f093f5be3e
1 changed files with 54 additions and 3 deletions
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57
clang/lib/CodeGen/TargetInfo.cpp
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@ -3041,6 +3041,7 @@ class MipsABIInfo : public ABIInfo {
bool IsO32;
unsigned MinABIStackAlignInBytes;
llvm::Type* HandleStructTy(QualType Ty) const;
llvm::Type* returnAggregateInRegs(QualType RetTy, uint64_t Size) const;
public:
MipsABIInfo(CodeGenTypes &CGT, bool _IsO32) :
ABIInfo(CGT), IsO32(_IsO32), MinABIStackAlignInBytes(IsO32 ? 4 : 8) {}
@ -3157,14 +3158,64 @@ ABIArgInfo MipsABIInfo::classifyArgumentType(QualType Ty) const {
ABIArgInfo::getExtend() : ABIArgInfo::getDirect());
}
llvm::Type*
MipsABIInfo::returnAggregateInRegs(QualType RetTy, uint64_t Size) const {
const RecordType *RT = RetTy->getAsStructureType();
SmallVector<llvm::Type*, 2> RTList;
if (RT) {
const RecordDecl *RD = RT->getDecl();
RecordDecl::field_iterator b = RD->field_begin(), e = RD->field_end(), i;
for (i = b; (i != e) && (std::distance(b, i) < 2); ++i) {
const BuiltinType *BT = (*i)->getType()->getAs<BuiltinType>();
if (!BT || !BT->isFloatingPoint())
break;
switch (BT->getKind()) {
case BuiltinType::Float:
RTList.push_back(llvm::Type::getFloatTy(getVMContext()));
break;
case BuiltinType::Double:
RTList.push_back(llvm::Type::getDoubleTy(getVMContext()));
break;
case BuiltinType::LongDouble:
RTList.push_back(llvm::Type::getFP128Ty(getVMContext()));
break;
default:
assert(false && "Unexpexted floating point type.");
}
}
if (i == e)
return llvm::StructType::get(getVMContext(), RTList,
RD->hasAttr<PackedAttr>());
RTList.clear();
}
RTList.push_back(llvm::IntegerType::get(getVMContext(),
std::min(Size, (uint64_t)64)));
if (Size > 64)
RTList.push_back(llvm::IntegerType::get(getVMContext(), Size - 64));
return llvm::StructType::get(getVMContext(), RTList);
}
ABIArgInfo MipsABIInfo::classifyReturnType(QualType RetTy) const {
if (RetTy->isVoidType())
return ABIArgInfo::getIgnore();
if (isAggregateTypeForABI(RetTy)) {
if ((IsO32 && RetTy->isAnyComplexType()) ||
(!IsO32 && (getContext().getTypeSize(RetTy) <= 128)))
return ABIArgInfo::getDirect();
uint64_t Size = getContext().getTypeSize(RetTy);
if (Size <= 128) {
if (RetTy->isAnyComplexType())
return ABIArgInfo::getDirect();
if (!IsO32)
return ABIArgInfo::getDirect(returnAggregateInRegs(RetTy, Size));
}
return ABIArgInfo::getIndirect(0);
}