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When checking for sret-demotion, it needs to use legal types. When using the return value of an sret-demoted call, it needs to use possibly illegal types that match the declared Type of the callee.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93667 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kenneth Uildriks 2010-01-16 23:37:33 +00:00
parent dbc130f592
commit 93ae407ec3
2 changed files with 53 additions and 11 deletions
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52
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
View File

@ -800,18 +800,19 @@ SDValue SelectionDAGBuilder::getValue(const Value *V) {
SDNodeOrder, Chain, NULL);
}
/// Get the EVTs and ArgFlags collections that represent the return type
/// of the given function. This does not require a DAG or a return value, and
/// is suitable for use before any DAGs for the function are constructed.
/// Get the EVTs and ArgFlags collections that represent the legalized return
/// type of the given function. This does not require a DAG or a return value,
/// and is suitable for use before any DAGs for the function are constructed.
static void getReturnInfo(const Type* ReturnType,
Attributes attr, SmallVectorImpl<EVT> &OutVTs,
SmallVectorImpl<ISD::ArgFlagsTy> &OutFlags,
TargetLowering &TLI,
SmallVectorImpl<uint64_t> *Offsets = 0) {
SmallVector<EVT, 4> ValueVTs;
ComputeValueVTs(TLI, ReturnType, ValueVTs, Offsets);
ComputeValueVTs(TLI, ReturnType, ValueVTs);
unsigned NumValues = ValueVTs.size();
if ( NumValues == 0 ) return;
if (NumValues == 0) return;
unsigned Offset = 0;
for (unsigned j = 0, f = NumValues; j != f; ++j) {
EVT VT = ValueVTs[j];
@ -834,6 +835,9 @@ static void getReturnInfo(const Type* ReturnType,
unsigned NumParts = TLI.getNumRegisters(ReturnType->getContext(), VT);
EVT PartVT = TLI.getRegisterType(ReturnType->getContext(), VT);
unsigned PartSize = TLI.getTargetData()->getTypeAllocSize(
PartVT.getTypeForEVT(ReturnType->getContext()));
// 'inreg' on function refers to return value
ISD::ArgFlagsTy Flags = ISD::ArgFlagsTy();
if (attr & Attribute::InReg)
@ -848,6 +852,11 @@ static void getReturnInfo(const Type* ReturnType,
for (unsigned i = 0; i < NumParts; ++i) {
OutVTs.push_back(PartVT);
OutFlags.push_back(Flags);
if (Offsets)
{
Offsets->push_back(Offset);
Offset += PartSize;
}
}
}
}
@ -5098,16 +5107,37 @@ void SelectionDAGBuilder::LowerCallTo(CallSite CS, SDValue Callee,
SDValue Chain = DAG.getNode(ISD::TokenFactor, getCurDebugLoc(),
MVT::Other, &Chains[0], NumValues);
PendingLoads.push_back(Chain);
// Collect the legal value parts into potentially illegal values
// that correspond to the original function's return values.
SmallVector<EVT, 4> RetTys;
RetTy = FTy->getReturnType();
ComputeValueVTs(TLI, RetTy, RetTys);
ISD::NodeType AssertOp = ISD::DELETED_NODE;
SmallVector<SDValue, 4> ReturnValues;
unsigned CurReg = 0;
for (unsigned I = 0, E = RetTys.size(); I != E; ++I) {
EVT VT = RetTys[I];
EVT RegisterVT = TLI.getRegisterType(RetTy->getContext(), VT);
unsigned NumRegs = TLI.getNumRegisters(RetTy->getContext(), VT);
SDValue ReturnValue =
getCopyFromParts(DAG, getCurDebugLoc(), SDNodeOrder, &Values[CurReg], NumRegs,
RegisterVT, VT, AssertOp);
ReturnValues.push_back(ReturnValue);
if (DisableScheduling)
DAG.AssignOrdering(ReturnValue.getNode(), SDNodeOrder);
CurReg += NumRegs;
}
SDValue Res = DAG.getNode(ISD::MERGE_VALUES, getCurDebugLoc(),
DAG.getVTList(&RetTys[0], RetTys.size()),
&ReturnValues[0], ReturnValues.size());
SDValue MV = DAG.getNode(ISD::MERGE_VALUES,
getCurDebugLoc(),
DAG.getVTList(&OutVTs[0], NumValues),
&Values[0], NumValues);
setValue(CS.getInstruction(), MV);
setValue(CS.getInstruction(), Res);
if (DisableScheduling) {
DAG.AssignOrdering(Chain.getNode(), SDNodeOrder);
DAG.AssignOrdering(MV.getNode(), SDNodeOrder);
DAG.AssignOrdering(Res.getNode(), SDNodeOrder);
}
}

12
test/CodeGen/X86/bigstructret2.ll Normal file
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@ -0,0 +1,12 @@
; RUN: llc < %s -march=x86 -o %t
%0 = type { i64, i64 }
declare fastcc %0 @ReturnBigStruct() nounwind readnone
define void @test(%0* %p) {
%1 = call fastcc %0 @ReturnBigStruct()
store %0 %1, %0* %p
ret void
}