//===-- HexagonSelectionDAGInfo.cpp - Hexagon SelectionDAG Info -----------===// // // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. // See https://llvm.org/LICENSE.txt for license information. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // //===----------------------------------------------------------------------===// // // This file implements the HexagonSelectionDAGInfo class. // //===----------------------------------------------------------------------===// #include "HexagonTargetMachine.h" #include "llvm/CodeGen/SelectionDAG.h" using namespace llvm; #define DEBUG_TYPE "hexagon-selectiondag-info" SDValue HexagonSelectionDAGInfo::EmitTargetCodeForMemcpy( SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Dst, SDValue Src, SDValue Size, Align Alignment, bool isVolatile, bool AlwaysInline, MachinePointerInfo DstPtrInfo, MachinePointerInfo SrcPtrInfo) const { ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size); if (AlwaysInline || Alignment < Align(4) || !ConstantSize) return SDValue(); uint64_t SizeVal = ConstantSize->getZExtValue(); if (SizeVal < 32 || (SizeVal % 8) != 0) return SDValue(); // Special case aligned memcpys with size >= 32 bytes and a multiple of 8. // const TargetLowering &TLI = *DAG.getSubtarget().getTargetLowering(); TargetLowering::ArgListTy Args; TargetLowering::ArgListEntry Entry; Entry.Ty = DAG.getDataLayout().getIntPtrType(*DAG.getContext()); Entry.Node = Dst; Args.push_back(Entry); Entry.Node = Src; Args.push_back(Entry); Entry.Node = Size; Args.push_back(Entry); const char *SpecialMemcpyName = "__hexagon_memcpy_likely_aligned_min32bytes_mult8bytes"; const MachineFunction &MF = DAG.getMachineFunction(); bool LongCalls = MF.getSubtarget<HexagonSubtarget>().useLongCalls(); unsigned Flags = LongCalls ? HexagonII::HMOTF_ConstExtended : 0; TargetLowering::CallLoweringInfo CLI(DAG); CLI.setDebugLoc(dl) .setChain(Chain) .setLibCallee( TLI.getLibcallCallingConv(RTLIB::MEMCPY), Type::getVoidTy(*DAG.getContext()), DAG.getTargetExternalSymbol( SpecialMemcpyName, TLI.getPointerTy(DAG.getDataLayout()), Flags), std::move(Args)) .setDiscardResult(); std::pair<SDValue, SDValue> CallResult = TLI.LowerCallTo(CLI); return CallResult.second; } |