1//===-- XCoreSelectionDAGInfo.cpp - XCore SelectionDAG Info ---------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file implements the XCoreSelectionDAGInfo class.
11//
12//===----------------------------------------------------------------------===//
13
14#include "XCoreTargetMachine.h"
15using namespace llvm;
16
17#define DEBUG_TYPE "xcore-selectiondag-info"
18
19SDValue XCoreSelectionDAGInfo::EmitTargetCodeForMemcpy(
20    SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Dst, SDValue Src,
21    SDValue Size, unsigned Align, bool isVolatile, bool AlwaysInline,
22    MachinePointerInfo DstPtrInfo, MachinePointerInfo SrcPtrInfo) const {
23  unsigned SizeBitWidth = Size.getValueType().getSizeInBits();
24  // Call __memcpy_4 if the src, dst and size are all 4 byte aligned.
25  if (!AlwaysInline && (Align & 3) == 0 &&
26      DAG.MaskedValueIsZero(Size, APInt(SizeBitWidth, 3))) {
27    const TargetLowering &TLI = *DAG.getSubtarget().getTargetLowering();
28    TargetLowering::ArgListTy Args;
29    TargetLowering::ArgListEntry Entry;
30    Entry.Ty = DAG.getDataLayout().getIntPtrType(*DAG.getContext());
31    Entry.Node = Dst; Args.push_back(Entry);
32    Entry.Node = Src; Args.push_back(Entry);
33    Entry.Node = Size; Args.push_back(Entry);
34
35    TargetLowering::CallLoweringInfo CLI(DAG);
36    CLI.setDebugLoc(dl)
37        .setChain(Chain)
38        .setCallee(TLI.getLibcallCallingConv(RTLIB::MEMCPY),
39                   Type::getVoidTy(*DAG.getContext()),
40                   DAG.getExternalSymbol("__memcpy_4",
41                                         TLI.getPointerTy(DAG.getDataLayout())),
42                   std::move(Args))
43        .setDiscardResult();
44
45    std::pair<SDValue,SDValue> CallResult = TLI.LowerCallTo(CLI);
46    return CallResult.second;
47  }
48
49  // Otherwise have the target-independent code call memcpy.
50  return SDValue();
51}
52