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"
15 using namespace llvm;
16
17 #define DEBUG_TYPE "xcore-selectiondag-info"
18
XCoreSelectionDAGInfo(const DataLayout & DL)19 XCoreSelectionDAGInfo::XCoreSelectionDAGInfo(const DataLayout &DL)
20 : TargetSelectionDAGInfo(&DL) {}
21
~XCoreSelectionDAGInfo()22 XCoreSelectionDAGInfo::~XCoreSelectionDAGInfo() {
23 }
24
25 SDValue XCoreSelectionDAGInfo::
EmitTargetCodeForMemcpy(SelectionDAG & DAG,SDLoc dl,SDValue Chain,SDValue Dst,SDValue Src,SDValue Size,unsigned Align,bool isVolatile,bool AlwaysInline,MachinePointerInfo DstPtrInfo,MachinePointerInfo SrcPtrInfo) const26 EmitTargetCodeForMemcpy(SelectionDAG &DAG, SDLoc dl, SDValue Chain,
27 SDValue Dst, SDValue Src, SDValue Size, unsigned Align,
28 bool isVolatile, bool AlwaysInline,
29 MachinePointerInfo DstPtrInfo,
30 MachinePointerInfo SrcPtrInfo) const
31 {
32 unsigned SizeBitWidth = Size.getValueType().getSizeInBits();
33 // Call __memcpy_4 if the src, dst and size are all 4 byte aligned.
34 if (!AlwaysInline && (Align & 3) == 0 &&
35 DAG.MaskedValueIsZero(Size, APInt(SizeBitWidth, 3))) {
36 const TargetLowering &TLI = *DAG.getSubtarget().getTargetLowering();
37 TargetLowering::ArgListTy Args;
38 TargetLowering::ArgListEntry Entry;
39 Entry.Ty = TLI.getDataLayout()->getIntPtrType(*DAG.getContext());
40 Entry.Node = Dst; Args.push_back(Entry);
41 Entry.Node = Src; Args.push_back(Entry);
42 Entry.Node = Size; Args.push_back(Entry);
43
44 TargetLowering::CallLoweringInfo CLI(DAG);
45 CLI.setDebugLoc(dl).setChain(Chain)
46 .setCallee(TLI.getLibcallCallingConv(RTLIB::MEMCPY),
47 Type::getVoidTy(*DAG.getContext()),
48 DAG.getExternalSymbol("__memcpy_4", TLI.getPointerTy()),
49 std::move(Args), 0)
50 .setDiscardResult();
51
52 std::pair<SDValue,SDValue> CallResult = TLI.LowerCallTo(CLI);
53 return CallResult.second;
54 }
55
56 // Otherwise have the target-independent code call memcpy.
57 return SDValue();
58 }
59