59 lines
2.2 KiB
C++
59 lines
2.2 KiB
C++
//===-- XCoreSelectionDAGInfo.cpp - XCore 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 XCoreSelectionDAGInfo class.
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//
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//===----------------------------------------------------------------------===//
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#include "XCoreTargetMachine.h"
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using namespace llvm;
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#define DEBUG_TYPE "xcore-selectiondag-info"
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XCoreSelectionDAGInfo::XCoreSelectionDAGInfo(const DataLayout &DL)
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: TargetSelectionDAGInfo(&DL) {}
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XCoreSelectionDAGInfo::~XCoreSelectionDAGInfo() {
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}
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SDValue XCoreSelectionDAGInfo::
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EmitTargetCodeForMemcpy(SelectionDAG &DAG, SDLoc dl, SDValue Chain,
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SDValue Dst, SDValue Src, SDValue Size, unsigned Align,
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bool isVolatile, bool AlwaysInline,
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MachinePointerInfo DstPtrInfo,
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MachinePointerInfo SrcPtrInfo) const
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{
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unsigned SizeBitWidth = Size.getValueType().getSizeInBits();
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// Call __memcpy_4 if the src, dst and size are all 4 byte aligned.
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if (!AlwaysInline && (Align & 3) == 0 &&
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DAG.MaskedValueIsZero(Size, APInt(SizeBitWidth, 3))) {
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const TargetLowering &TLI = *DAG.getSubtarget().getTargetLowering();
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TargetLowering::ArgListTy Args;
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TargetLowering::ArgListEntry Entry;
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Entry.Ty = TLI.getDataLayout()->getIntPtrType(*DAG.getContext());
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Entry.Node = Dst; Args.push_back(Entry);
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Entry.Node = Src; Args.push_back(Entry);
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Entry.Node = Size; Args.push_back(Entry);
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TargetLowering::CallLoweringInfo CLI(DAG);
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CLI.setDebugLoc(dl).setChain(Chain)
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.setCallee(TLI.getLibcallCallingConv(RTLIB::MEMCPY),
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Type::getVoidTy(*DAG.getContext()),
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DAG.getExternalSymbol("__memcpy_4", TLI.getPointerTy()),
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std::move(Args), 0)
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.setDiscardResult();
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std::pair<SDValue,SDValue> CallResult = TLI.LowerCallTo(CLI);
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return CallResult.second;
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}
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// Otherwise have the target-independent code call memcpy.
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return SDValue();
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}
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