| 1 | //===-- XCoreSelectionDAGInfo.cpp - XCore 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 XCoreSelectionDAGInfo class. |
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| 10 | // |
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| 11 | //===----------------------------------------------------------------------===// |
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| 12 | |
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| 13 | #include "XCoreTargetMachine.h" |
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| 14 | using namespace llvm; |
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| 15 | |
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| 16 | #define DEBUG_TYPE "xcore-selectiondag-info" |
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| 17 | |
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| 18 | SDValue XCoreSelectionDAGInfo::EmitTargetCodeForMemcpy( |
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| 19 | SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Dst, SDValue Src, |
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| 20 | SDValue Size, Align Alignment, bool isVolatile, bool AlwaysInline, |
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| 21 | MachinePointerInfo DstPtrInfo, MachinePointerInfo SrcPtrInfo) const { |
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| 22 | unsigned SizeBitWidth = Size.getValueSizeInBits(); |
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| 23 | // Call __memcpy_4 if the src, dst and size are all 4 byte aligned. |
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| 24 | if (!AlwaysInline && Alignment >= Align(4) && |
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| 25 | DAG.MaskedValueIsZero(Op: Size, Mask: APInt(SizeBitWidth, 3))) { |
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| 26 | const TargetLowering &TLI = *DAG.getSubtarget().getTargetLowering(); |
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| 27 | TargetLowering::ArgListTy Args; |
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| 28 | TargetLowering::ArgListEntry Entry; |
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| 29 | Entry.Ty = DAG.getDataLayout().getIntPtrType(C&: *DAG.getContext()); |
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| 30 | Entry.Node = Dst; Args.push_back(x: Entry); |
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| 31 | Entry.Node = Src; Args.push_back(x: Entry); |
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| 32 | Entry.Node = Size; Args.push_back(x: Entry); |
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| 33 | |
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| 34 | TargetLowering::CallLoweringInfo CLI(DAG); |
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| 35 | CLI.setDebugLoc(dl) |
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| 36 | .setChain(Chain) |
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| 37 | .setLibCallee(CC: TLI.getLibcallCallingConv(Call: RTLIB::MEMCPY), |
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| 38 | ResultType: Type::getVoidTy(C&: *DAG.getContext()), |
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| 39 | Target: DAG.getExternalSymbol( |
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| 40 | Sym: "__memcpy_4" , VT: TLI.getPointerTy(DL: DAG.getDataLayout())), |
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| 41 | ArgsList: std::move(Args)) |
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| 42 | .setDiscardResult(); |
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| 43 | |
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| 44 | std::pair<SDValue,SDValue> CallResult = TLI.LowerCallTo(CLI); |
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| 45 | return CallResult.second; |
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| 46 | } |
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| 47 | |
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| 48 | // Otherwise have the target-independent code call memcpy. |
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| 49 | return SDValue(); |
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| 50 | } |
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| 51 | |
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