01bc742185
This ensures that the required fields are set, and also makes the construction more convenient.
61 lines
2.3 KiB
C++
61 lines
2.3 KiB
C++
//===-- XCoreSelectionDAGInfo.cpp - XCore SelectionDAG Info ---------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the XCoreSelectionDAGInfo class.
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//
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//===----------------------------------------------------------------------===//
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#include "XCoreSelectionDAGInfo.h"
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#include "XCoreTargetMachine.h"
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#define GET_SDNODE_DESC
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#include "XCoreGenSDNodeInfo.inc"
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using namespace llvm;
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#define DEBUG_TYPE "xcore-selectiondag-info"
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XCoreSelectionDAGInfo::XCoreSelectionDAGInfo()
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: SelectionDAGGenTargetInfo(XCoreGenSDNodeInfo) {}
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SDValue XCoreSelectionDAGInfo::EmitTargetCodeForMemcpy(
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SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Dst, SDValue Src,
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SDValue Size, Align Alignment, bool isVolatile, bool AlwaysInline,
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MachinePointerInfo DstPtrInfo, MachinePointerInfo SrcPtrInfo) const {
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unsigned SizeBitWidth = Size.getValueSizeInBits();
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// Call __memcpy_4 if the src, dst and size are all 4 byte aligned.
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if (!AlwaysInline && Alignment >= Align(4) &&
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DAG.MaskedValueIsZero(Size, APInt(SizeBitWidth, 3))) {
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const TargetLowering &TLI = *DAG.getSubtarget().getTargetLowering();
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TargetLowering::ArgListTy Args;
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Type *ArgTy = DAG.getDataLayout().getIntPtrType(*DAG.getContext());
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Args.emplace_back(Dst, ArgTy);
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Args.emplace_back(Src, ArgTy);
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Args.emplace_back(Size, ArgTy);
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const char *MemcpyAlign4Name = TLI.getLibcallName(RTLIB::MEMCPY_ALIGN_4);
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CallingConv::ID CC = TLI.getLibcallCallingConv(RTLIB::MEMCPY_ALIGN_4);
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TargetLowering::CallLoweringInfo CLI(DAG);
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CLI.setDebugLoc(dl)
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.setChain(Chain)
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.setLibCallee(
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CC, Type::getVoidTy(*DAG.getContext()),
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DAG.getExternalSymbol(MemcpyAlign4Name,
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TLI.getPointerTy(DAG.getDataLayout())),
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std::move(Args))
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.setDiscardResult();
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std::pair<SDValue,SDValue> CallResult = TLI.LowerCallTo(CLI);
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return CallResult.second;
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}
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// Otherwise have the target-independent code call memcpy.
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return SDValue();
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}
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