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//===-- XCoreSelectionDAGInfo.cpp - XCore 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 XCoreSelectionDAGInfo class.
//
//===----------------------------------------------------------------------===//
#include "XCoreTargetMachine.h"
using namespace llvm;
#define DEBUG_TYPE "xcore-selectiondag-info"
SDValue XCoreSelectionDAGInfo::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 {
unsigned SizeBitWidth = Size.getValueSizeInBits();
// Call __memcpy_4 if the src, dst and size are all 4 byte aligned.
if (!AlwaysInline && Alignment >= Align(4) &&
DAG.MaskedValueIsZero(Size, APInt(SizeBitWidth, 3))) {
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);
TargetLowering::CallLoweringInfo CLI(DAG);
CLI.setDebugLoc(dl)
.setChain(Chain)
.setLibCallee(TLI.getLibcallCallingConv(RTLIB::MEMCPY),
Type::getVoidTy(*DAG.getContext()),
DAG.getExternalSymbol(
"__memcpy_4", TLI.getPointerTy(DAG.getDataLayout())),
std::move(Args))
.setDiscardResult();
std::pair<SDValue,SDValue> CallResult = TLI.LowerCallTo(CLI);
return CallResult.second;
}
// Otherwise have the target-independent code call memcpy.
return SDValue();
}
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