1//===-- AArch64SelectionDAGInfo.cpp - AArch64 SelectionDAG Info -----------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file implements the AArch64SelectionDAGInfo class.
11//
12//===----------------------------------------------------------------------===//
13
14#include "AArch64TargetMachine.h"
15using namespace llvm;
16
17#define DEBUG_TYPE "aarch64-selectiondag-info"
18
19SDValue AArch64SelectionDAGInfo::EmitTargetCodeForMemset(
20    SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Dst, SDValue Src,
21    SDValue Size, unsigned Align, bool isVolatile,
22    MachinePointerInfo DstPtrInfo) const {
23  // Check to see if there is a specialized entry-point for memory zeroing.
24  ConstantSDNode *V = dyn_cast<ConstantSDNode>(Src);
25  ConstantSDNode *SizeValue = dyn_cast<ConstantSDNode>(Size);
26  const AArch64Subtarget &STI =
27      DAG.getMachineFunction().getSubtarget<AArch64Subtarget>();
28  const char *bzeroEntry =
29      (V && V->isNullValue()) ? STI.getBZeroEntry() : nullptr;
30  // For small size (< 256), it is not beneficial to use bzero
31  // instead of memset.
32  if (bzeroEntry && (!SizeValue || SizeValue->getZExtValue() > 256)) {
33    const AArch64TargetLowering &TLI = *STI.getTargetLowering();
34
35    EVT IntPtr = TLI.getPointerTy(DAG.getDataLayout());
36    Type *IntPtrTy = DAG.getDataLayout().getIntPtrType(*DAG.getContext());
37    TargetLowering::ArgListTy Args;
38    TargetLowering::ArgListEntry Entry;
39    Entry.Node = Dst;
40    Entry.Ty = IntPtrTy;
41    Args.push_back(Entry);
42    Entry.Node = Size;
43    Args.push_back(Entry);
44    TargetLowering::CallLoweringInfo CLI(DAG);
45    CLI.setDebugLoc(dl).setChain(Chain)
46      .setCallee(CallingConv::C, Type::getVoidTy(*DAG.getContext()),
47                 DAG.getExternalSymbol(bzeroEntry, IntPtr), std::move(Args))
48      .setDiscardResult();
49    std::pair<SDValue, SDValue> CallResult = TLI.LowerCallTo(CLI);
50    return CallResult.second;
51  }
52  return SDValue();
53}
54bool AArch64SelectionDAGInfo::generateFMAsInMachineCombiner(
55    CodeGenOpt::Level OptLevel) const {
56  if (OptLevel >= CodeGenOpt::Aggressive)
57    return true;
58  return false;
59}
60