44 lines
1.6 KiB
C++
44 lines
1.6 KiB
C++
//===-- BPFSelectionDAGInfo.cpp - BPF SelectionDAG Info -------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the BPFSelectionDAGInfo class.
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//
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//===----------------------------------------------------------------------===//
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#include "BPFTargetMachine.h"
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#include "llvm/CodeGen/SelectionDAG.h"
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#include "llvm/IR/DerivedTypes.h"
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using namespace llvm;
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#define DEBUG_TYPE "bpf-selectiondag-info"
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SDValue BPFSelectionDAGInfo::EmitTargetCodeForMemcpy(
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SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Dst, SDValue Src,
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SDValue Size, unsigned Align, bool isVolatile, bool AlwaysInline,
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MachinePointerInfo DstPtrInfo, MachinePointerInfo SrcPtrInfo) const {
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// Requires the copy size to be a constant.
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ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
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if (!ConstantSize)
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return SDValue();
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unsigned CopyLen = ConstantSize->getZExtValue();
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unsigned StoresNumEstimate = alignTo(CopyLen, Align) >> Log2_32(Align);
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// Impose the same copy length limit as MaxStoresPerMemcpy.
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if (StoresNumEstimate > getCommonMaxStoresPerMemFunc())
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return SDValue();
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SDVTList VTs = DAG.getVTList(MVT::Other, MVT::Glue);
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Dst = DAG.getNode(BPFISD::MEMCPY, dl, VTs, Chain, Dst, Src,
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DAG.getConstant(CopyLen, dl, MVT::i64),
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DAG.getConstant(Align, dl, MVT::i64));
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return Dst.getValue(0);
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}
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