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Tim Northover3b0846e2014-05-24 12:50:23 +00001//===-- 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
Tim Northover3b0846e2014-05-24 12:50:23 +000019SDValue AArch64SelectionDAGInfo::EmitTargetCodeForMemset(
Benjamin Kramerbdc49562016-06-12 15:39:02 +000020 SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Dst, SDValue Src,
Tim Northover3b0846e2014-05-24 12:50:23 +000021 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);
Eric Christopher3ee30d02015-02-20 08:39:06 +000026 const AArch64Subtarget &STI =
27 DAG.getMachineFunction().getSubtarget<AArch64Subtarget>();
Matthias Brauna92cecf2017-12-18 23:14:28 +000028 const char *bzeroName = (V && V->isNullValue())
29 ? DAG.getTargetLoweringInfo().getLibcallName(RTLIB::BZERO) : nullptr;
Tim Northover3b0846e2014-05-24 12:50:23 +000030 // For small size (< 256), it is not beneficial to use bzero
31 // instead of memset.
Matthias Brauna92cecf2017-12-18 23:14:28 +000032 if (bzeroName && (!SizeValue || SizeValue->getZExtValue() > 256)) {
Eric Christopher3ee30d02015-02-20 08:39:06 +000033 const AArch64TargetLowering &TLI = *STI.getTargetLowering();
Tim Northover3b0846e2014-05-24 12:50:23 +000034
Mehdi Amini44ede332015-07-09 02:09:04 +000035 EVT IntPtr = TLI.getPointerTy(DAG.getDataLayout());
36 Type *IntPtrTy = DAG.getDataLayout().getIntPtrType(*DAG.getContext());
Tim Northover3b0846e2014-05-24 12:50:23 +000037 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);
Nirav Dave6de2c772017-03-18 00:43:57 +000045 CLI.setDebugLoc(dl)
46 .setChain(Chain)
Nirav Daveac6081c2017-03-18 00:44:07 +000047 .setLibCallee(CallingConv::C, Type::getVoidTy(*DAG.getContext()),
Matthias Brauna92cecf2017-12-18 23:14:28 +000048 DAG.getExternalSymbol(bzeroName, IntPtr),
Nirav Daveac6081c2017-03-18 00:44:07 +000049 std::move(Args))
Nirav Dave6de2c772017-03-18 00:43:57 +000050 .setDiscardResult();
Tim Northover3b0846e2014-05-24 12:50:23 +000051 std::pair<SDValue, SDValue> CallResult = TLI.LowerCallTo(CLI);
52 return CallResult.second;
53 }
54 return SDValue();
55}
Gerolf Hoflehner50426192016-04-27 17:27:16 +000056bool AArch64SelectionDAGInfo::generateFMAsInMachineCombiner(
Gerolf Hoflehner01b3a6182016-04-24 05:14:01 +000057 CodeGenOpt::Level OptLevel) const {
Davide Italiano0145e752017-03-22 23:37:58 +000058 return OptLevel >= CodeGenOpt::Aggressive;
Gerolf Hoflehner01b3a6182016-04-24 05:14:01 +000059}