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" 14 using namespace llvm; 15 16 #define DEBUG_TYPE "xcore-selectiondag-info" 17 18 SDValue 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