52 lines
2.0 KiB
C++
52 lines
2.0 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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SDValue XCoreSelectionDAGInfo::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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unsigned SizeBitWidth = Size.getValueSizeInBits();
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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 = DAG.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)
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.setChain(Chain)
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.setLibCallee(TLI.getLibcallCallingConv(RTLIB::MEMCPY),
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Type::getVoidTy(*DAG.getContext()),
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DAG.getExternalSymbol(
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"__memcpy_4", TLI.getPointerTy(DAG.getDataLayout())),
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std::move(Args))
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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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