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 19 XCoreSelectionDAGInfo::XCoreSelectionDAGInfo(const DataLayout &DL) 20 : TargetSelectionDAGInfo(&DL) {} 21 22 XCoreSelectionDAGInfo::~XCoreSelectionDAGInfo() { 23 } 24 25 SDValue XCoreSelectionDAGInfo:: 26 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.getTarget().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
