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[CodeGen] Refactor CreateStackTemporary 

I've created a new variant of CreateStackTemporary that takes
TypeSize and Align arguments, and made the older instances of
CreateStackTemporary call this new function. This refactoring is
in preparation for more patches in this area related to scalable
vectors and improving the alignment calculations.

Differential Revision: https://reviews.llvm.org/D79933
This commit is contained in:
David Sherwood 2020-05-14 11:18:31 +01:00
parent 4042ada1c1
commit 8ce4a8f6df
2 changed files with 16 additions and 15 deletions
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3
llvm/include/llvm/CodeGen/SelectionDAG.h
View File

@ -1595,6 +1595,9 @@ public:
void dump() const;
/// Create a stack temporary based on the size in bytes and the alignment
SDValue CreateStackTemporary(TypeSize Bytes, Align Alignment);
/// Create a stack temporary, suitable for holding the specified value type.
/// If minAlign is specified, the slot size will have at least that alignment.
SDValue CreateStackTemporary(EVT VT, unsigned minAlign = 1);

28
llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
View File

@ -1995,28 +1995,26 @@ SDValue SelectionDAG::expandVACopy(SDNode *Node) {
MachinePointerInfo(VD));
}
SDValue SelectionDAG::CreateStackTemporary(EVT VT, unsigned minAlign) {
MachineFrameInfo &MFI = getMachineFunction().getFrameInfo();
unsigned ByteSize = VT.getStoreSize();
Type *Ty = VT.getTypeForEVT(*getContext());
unsigned StackAlign =
std::max((unsigned)getDataLayout().getPrefTypeAlignment(Ty), minAlign);
int FrameIdx = MFI.CreateStackObject(ByteSize, StackAlign, false);
SDValue SelectionDAG::CreateStackTemporary(TypeSize Bytes, Align Alignment) {
MachineFrameInfo &MFI = MF->getFrameInfo();
int FrameIdx = MFI.CreateStackObject(Bytes, Alignment, false);
return getFrameIndex(FrameIdx, TLI->getFrameIndexTy(getDataLayout()));
}
SDValue SelectionDAG::CreateStackTemporary(EVT VT, unsigned minAlign) {
Type *Ty = VT.getTypeForEVT(*getContext());
Align StackAlign =
std::max(getDataLayout().getPrefTypeAlign(Ty), Align(minAlign));
return CreateStackTemporary(VT.getStoreSize(), StackAlign);
}
SDValue SelectionDAG::CreateStackTemporary(EVT VT1, EVT VT2) {
unsigned Bytes = std::max(VT1.getStoreSize(), VT2.getStoreSize());
TypeSize Bytes = std::max(VT1.getStoreSize(), VT2.getStoreSize());
Type *Ty1 = VT1.getTypeForEVT(*getContext());
Type *Ty2 = VT2.getTypeForEVT(*getContext());
const DataLayout &DL = getDataLayout();
unsigned Align =
std::max(DL.getPrefTypeAlignment(Ty1), DL.getPrefTypeAlignment(Ty2));
MachineFrameInfo &MFI = getMachineFunction().getFrameInfo();
int FrameIdx = MFI.CreateStackObject(Bytes, Align, false);
return getFrameIndex(FrameIdx, TLI->getFrameIndexTy(getDataLayout()));
Align Align = std::max(DL.getPrefTypeAlign(Ty1), DL.getPrefTypeAlign(Ty2));
return CreateStackTemporary(Bytes, Align);
}
SDValue SelectionDAG::FoldSetCC(EVT VT, SDValue N1, SDValue N2,