Tim Northover | 3b0846e | 2014-05-24 12:50:23 +0000 | [diff] [blame] | 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 | |
Tim Northover | 3b0846e | 2014-05-24 12:50:23 +0000 | [diff] [blame] | 19 | SDValue AArch64SelectionDAGInfo::EmitTargetCodeForMemset( |
Benjamin Kramer | bdc4956 | 2016-06-12 15:39:02 +0000 | [diff] [blame] | 20 | SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Dst, SDValue Src, |
Tim Northover | 3b0846e | 2014-05-24 12:50:23 +0000 | [diff] [blame] | 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); |
Eric Christopher | 3ee30d0 | 2015-02-20 08:39:06 +0000 | [diff] [blame] | 26 | const AArch64Subtarget &STI = |
| 27 | DAG.getMachineFunction().getSubtarget<AArch64Subtarget>(); |
Matthias Braun | a92cecf | 2017-12-18 23:14:28 +0000 | [diff] [blame] | 28 | const char *bzeroName = (V && V->isNullValue()) |
| 29 | ? DAG.getTargetLoweringInfo().getLibcallName(RTLIB::BZERO) : nullptr; |
Tim Northover | 3b0846e | 2014-05-24 12:50:23 +0000 | [diff] [blame] | 30 | // For small size (< 256), it is not beneficial to use bzero |
| 31 | // instead of memset. |
Matthias Braun | a92cecf | 2017-12-18 23:14:28 +0000 | [diff] [blame] | 32 | if (bzeroName && (!SizeValue || SizeValue->getZExtValue() > 256)) { |
Eric Christopher | 3ee30d0 | 2015-02-20 08:39:06 +0000 | [diff] [blame] | 33 | const AArch64TargetLowering &TLI = *STI.getTargetLowering(); |
Tim Northover | 3b0846e | 2014-05-24 12:50:23 +0000 | [diff] [blame] | 34 | |
Mehdi Amini | 44ede33 | 2015-07-09 02:09:04 +0000 | [diff] [blame] | 35 | EVT IntPtr = TLI.getPointerTy(DAG.getDataLayout()); |
| 36 | Type *IntPtrTy = DAG.getDataLayout().getIntPtrType(*DAG.getContext()); |
Tim Northover | 3b0846e | 2014-05-24 12:50:23 +0000 | [diff] [blame] | 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); |
Nirav Dave | 6de2c77 | 2017-03-18 00:43:57 +0000 | [diff] [blame] | 45 | CLI.setDebugLoc(dl) |
| 46 | .setChain(Chain) |
Nirav Dave | ac6081c | 2017-03-18 00:44:07 +0000 | [diff] [blame] | 47 | .setLibCallee(CallingConv::C, Type::getVoidTy(*DAG.getContext()), |
Matthias Braun | a92cecf | 2017-12-18 23:14:28 +0000 | [diff] [blame] | 48 | DAG.getExternalSymbol(bzeroName, IntPtr), |
Nirav Dave | ac6081c | 2017-03-18 00:44:07 +0000 | [diff] [blame] | 49 | std::move(Args)) |
Nirav Dave | 6de2c77 | 2017-03-18 00:43:57 +0000 | [diff] [blame] | 50 | .setDiscardResult(); |
Tim Northover | 3b0846e | 2014-05-24 12:50:23 +0000 | [diff] [blame] | 51 | std::pair<SDValue, SDValue> CallResult = TLI.LowerCallTo(CLI); |
| 52 | return CallResult.second; |
| 53 | } |
| 54 | return SDValue(); |
| 55 | } |
Gerolf Hoflehner | 5042619 | 2016-04-27 17:27:16 +0000 | [diff] [blame] | 56 | bool AArch64SelectionDAGInfo::generateFMAsInMachineCombiner( |
Gerolf Hoflehner | 01b3a618 | 2016-04-24 05:14:01 +0000 | [diff] [blame] | 57 | CodeGenOpt::Level OptLevel) const { |
Davide Italiano | 0145e75 | 2017-03-22 23:37:58 +0000 | [diff] [blame] | 58 | return OptLevel >= CodeGenOpt::Aggressive; |
Gerolf Hoflehner | 01b3a618 | 2016-04-24 05:14:01 +0000 | [diff] [blame] | 59 | } |