64 lines
2.4 KiB
C++
64 lines
2.4 KiB
C++
|
//===-- 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;
|
||
|
|
}
|