1//===-- XCoreSelectionDAGInfo.cpp - XCore SelectionDAG Info ---------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements the XCoreSelectionDAGInfo class.
10//
11//===----------------------------------------------------------------------===//
12
13#include "XCoreTargetMachine.h"
14using namespace llvm;
15
16#define DEBUG_TYPE "xcore-selectiondag-info"
17
18SDValue XCoreSelectionDAGInfo::EmitTargetCodeForMemcpy(
19    SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Dst, SDValue Src,
20    SDValue Size, unsigned Align, bool isVolatile, bool AlwaysInline,
21    MachinePointerInfo DstPtrInfo, MachinePointerInfo SrcPtrInfo) const {
22  unsigned SizeBitWidth = Size.getValueSizeInBits();
23  // Call __memcpy_4 if the src, dst and size are all 4 byte aligned.
24  if (!AlwaysInline && (Align & 3) == 0 &&
25      DAG.MaskedValueIsZero(Size, APInt(SizeBitWidth, 3))) {
26    const TargetLowering &TLI = *DAG.getSubtarget().getTargetLowering();
27    TargetLowering::ArgListTy Args;
28    TargetLowering::ArgListEntry Entry;
29    Entry.Ty = DAG.getDataLayout().getIntPtrType(*DAG.getContext());
30    Entry.Node = Dst; Args.push_back(Entry);
31    Entry.Node = Src; Args.push_back(Entry);
32    Entry.Node = Size; Args.push_back(Entry);
33
34    TargetLowering::CallLoweringInfo CLI(DAG);
35    CLI.setDebugLoc(dl)
36        .setChain(Chain)
37        .setLibCallee(TLI.getLibcallCallingConv(RTLIB::MEMCPY),
38                      Type::getVoidTy(*DAG.getContext()),
39                      DAG.getExternalSymbol(
40                          "__memcpy_4", TLI.getPointerTy(DAG.getDataLayout())),
41                      std::move(Args))
42        .setDiscardResult();
43
44    std::pair<SDValue,SDValue> CallResult = TLI.LowerCallTo(CLI);
45    return CallResult.second;
46  }
47
48  // Otherwise have the target-independent code call memcpy.
49  return SDValue();
50}
51