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 SDValue 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
