Line data Source code
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"
15 : using namespace llvm;
16 :
17 : #define DEBUG_TYPE "aarch64-selectiondag-info"
18 :
19 20 : SDValue 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 20 : DAG.getMachineFunction().getSubtarget<AArch64Subtarget>();
28 38 : const char *bzeroName = (V && V->isNullValue())
29 33 : ? DAG.getTargetLoweringInfo().getLibcallName(RTLIB::BZERO) : nullptr;
30 : // For small size (< 256), it is not beneficial to use bzero
31 : // instead of memset.
32 17 : if (bzeroName && (!SizeValue || SizeValue->getZExtValue() > 256)) {
33 : const AArch64TargetLowering &TLI = *STI.getTargetLowering();
34 :
35 : EVT IntPtr = TLI.getPointerTy(DAG.getDataLayout());
36 5 : Type *IntPtrTy = DAG.getDataLayout().getIntPtrType(*DAG.getContext());
37 : TargetLowering::ArgListTy Args;
38 : TargetLowering::ArgListEntry Entry;
39 5 : Entry.Node = Dst;
40 5 : Entry.Ty = IntPtrTy;
41 5 : Args.push_back(Entry);
42 5 : Entry.Node = Size;
43 5 : Args.push_back(Entry);
44 5 : TargetLowering::CallLoweringInfo CLI(DAG);
45 : CLI.setDebugLoc(dl)
46 5 : .setChain(Chain)
47 5 : .setLibCallee(CallingConv::C, Type::getVoidTy(*DAG.getContext()),
48 : DAG.getExternalSymbol(bzeroName, IntPtr),
49 5 : std::move(Args))
50 : .setDiscardResult();
51 5 : std::pair<SDValue, SDValue> CallResult = TLI.LowerCallTo(CLI);
52 5 : return CallResult.second;
53 : }
54 15 : return SDValue();
55 : }
56 607 : bool AArch64SelectionDAGInfo::generateFMAsInMachineCombiner(
57 : CodeGenOpt::Level OptLevel) const {
58 607 : return OptLevel >= CodeGenOpt::Aggressive;
59 : }
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