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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
59 lines
2.3 KiB
C++
59 lines
2.3 KiB
C++
//===-- AArch64SelectionDAGInfo.cpp - AArch64 SelectionDAG Info -----------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the AArch64SelectionDAGInfo class.
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//
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//===----------------------------------------------------------------------===//
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#include "AArch64TargetMachine.h"
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using namespace llvm;
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#define DEBUG_TYPE "aarch64-selectiondag-info"
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SDValue AArch64SelectionDAGInfo::EmitTargetCodeForMemset(
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SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Dst, SDValue Src,
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SDValue Size, unsigned Align, bool isVolatile,
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MachinePointerInfo DstPtrInfo) const {
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// Check to see if there is a specialized entry-point for memory zeroing.
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ConstantSDNode *V = dyn_cast<ConstantSDNode>(Src);
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ConstantSDNode *SizeValue = dyn_cast<ConstantSDNode>(Size);
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const AArch64Subtarget &STI =
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DAG.getMachineFunction().getSubtarget<AArch64Subtarget>();
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const char *bzeroName = (V && V->isNullValue())
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? DAG.getTargetLoweringInfo().getLibcallName(RTLIB::BZERO) : nullptr;
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// For small size (< 256), it is not beneficial to use bzero
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// instead of memset.
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if (bzeroName && (!SizeValue || SizeValue->getZExtValue() > 256)) {
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const AArch64TargetLowering &TLI = *STI.getTargetLowering();
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EVT IntPtr = TLI.getPointerTy(DAG.getDataLayout());
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Type *IntPtrTy = DAG.getDataLayout().getIntPtrType(*DAG.getContext());
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TargetLowering::ArgListTy Args;
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TargetLowering::ArgListEntry Entry;
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Entry.Node = Dst;
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Entry.Ty = IntPtrTy;
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Args.push_back(Entry);
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Entry.Node = Size;
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Args.push_back(Entry);
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TargetLowering::CallLoweringInfo CLI(DAG);
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CLI.setDebugLoc(dl)
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.setChain(Chain)
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.setLibCallee(CallingConv::C, Type::getVoidTy(*DAG.getContext()),
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DAG.getExternalSymbol(bzeroName, IntPtr),
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std::move(Args))
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.setDiscardResult();
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std::pair<SDValue, SDValue> CallResult = TLI.LowerCallTo(CLI);
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return CallResult.second;
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}
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return SDValue();
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}
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bool AArch64SelectionDAGInfo::generateFMAsInMachineCombiner(
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CodeGenOpt::Level OptLevel) const {
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return OptLevel >= CodeGenOpt::Aggressive;
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}
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