| 1 | //===-- HexagonSelectionDAGInfo.cpp - Hexagon SelectionDAG Info -----------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file implements the HexagonSelectionDAGInfo class. |
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| 10 | // |
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| 11 | //===----------------------------------------------------------------------===// |
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| 12 | |
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| 13 | #include "HexagonTargetMachine.h" |
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| 14 | #include "llvm/CodeGen/SelectionDAG.h" |
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| 15 | using namespace llvm; |
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| 16 | |
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| 17 | #define DEBUG_TYPE "hexagon-selectiondag-info" |
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| 18 | |
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| 19 | SDValue HexagonSelectionDAGInfo::EmitTargetCodeForMemcpy( |
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| 20 | SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Dst, SDValue Src, |
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| 21 | SDValue Size, Align Alignment, bool isVolatile, bool AlwaysInline, |
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| 22 | MachinePointerInfo DstPtrInfo, MachinePointerInfo SrcPtrInfo) const { |
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| 23 | ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Val&: Size); |
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| 24 | if (AlwaysInline || Alignment < Align(4) || !ConstantSize) |
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| 25 | return SDValue(); |
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| 26 | |
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| 27 | uint64_t SizeVal = ConstantSize->getZExtValue(); |
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| 28 | if (SizeVal < 32 || (SizeVal % 8) != 0) |
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| 29 | return SDValue(); |
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| 30 | |
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| 31 | // Special case aligned memcpys with size >= 32 bytes and a multiple of 8. |
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| 32 | // |
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| 33 | const TargetLowering &TLI = *DAG.getSubtarget().getTargetLowering(); |
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| 34 | TargetLowering::ArgListTy Args; |
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| 35 | TargetLowering::ArgListEntry Entry; |
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| 36 | Entry.Ty = DAG.getDataLayout().getIntPtrType(C&: *DAG.getContext()); |
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| 37 | Entry.Node = Dst; |
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| 38 | Args.push_back(x: Entry); |
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| 39 | Entry.Node = Src; |
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| 40 | Args.push_back(x: Entry); |
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| 41 | Entry.Node = Size; |
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| 42 | Args.push_back(x: Entry); |
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| 43 | |
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| 44 | const char *SpecialMemcpyName = |
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| 45 | "__hexagon_memcpy_likely_aligned_min32bytes_mult8bytes" ; |
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| 46 | const MachineFunction &MF = DAG.getMachineFunction(); |
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| 47 | bool LongCalls = MF.getSubtarget<HexagonSubtarget>().useLongCalls(); |
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| 48 | unsigned Flags = LongCalls ? HexagonII::HMOTF_ConstExtended : 0; |
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| 49 | |
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| 50 | TargetLowering::CallLoweringInfo CLI(DAG); |
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| 51 | CLI.setDebugLoc(dl) |
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| 52 | .setChain(Chain) |
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| 53 | .setLibCallee( |
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| 54 | CC: TLI.getLibcallCallingConv(Call: RTLIB::MEMCPY), |
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| 55 | ResultType: Type::getVoidTy(C&: *DAG.getContext()), |
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| 56 | Target: DAG.getTargetExternalSymbol( |
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| 57 | Sym: SpecialMemcpyName, VT: TLI.getPointerTy(DL: DAG.getDataLayout()), TargetFlags: Flags), |
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| 58 | ArgsList: std::move(Args)) |
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| 59 | .setDiscardResult(); |
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| 60 | |
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| 61 | std::pair<SDValue, SDValue> CallResult = TLI.LowerCallTo(CLI); |
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| 62 | return CallResult.second; |
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| 63 | } |
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| 64 | |
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