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:: 20 EmitTargetCodeForMemcpy(SelectionDAG &DAG, SDLoc dl, SDValue Chain, 21 SDValue Dst, SDValue Src, SDValue Size, unsigned Align, 22 bool isVolatile, bool AlwaysInline, 23 MachinePointerInfo DstPtrInfo, 24 MachinePointerInfo SrcPtrInfo) const 25 { 26 unsigned SizeBitWidth = Size.getValueType().getSizeInBits(); 27 // Call __memcpy_4 if the src, dst and size are all 4 byte aligned. 28 if (!AlwaysInline && (Align & 3) == 0 && 29 DAG.MaskedValueIsZero(Size, APInt(SizeBitWidth, 3))) { 30 const TargetLowering &TLI = *DAG.getSubtarget().getTargetLowering(); 31 TargetLowering::ArgListTy Args; 32 TargetLowering::ArgListEntry Entry; 33 Entry.Ty = DAG.getDataLayout().getIntPtrType(*DAG.getContext()); 34 Entry.Node = Dst; Args.push_back(Entry); 35 Entry.Node = Src; Args.push_back(Entry); 36 Entry.Node = Size; Args.push_back(Entry); 37 38 TargetLowering::CallLoweringInfo CLI(DAG); 39 CLI.setDebugLoc(dl) 40 .setChain(Chain) 41 .setCallee(TLI.getLibcallCallingConv(RTLIB::MEMCPY), 42 Type::getVoidTy(*DAG.getContext()), 43 DAG.getExternalSymbol("__memcpy_4", 44 TLI.getPointerTy(DAG.getDataLayout())), 45 std::move(Args), 0) 46 .setDiscardResult(); 47 48 std::pair<SDValue,SDValue> CallResult = TLI.LowerCallTo(CLI); 49 return CallResult.second; 50 } 51 52 // Otherwise have the target-independent code call memcpy. 53 return SDValue(); 54 } 55