diff options
Diffstat (limited to 'contrib/llvm/lib/Target/Hexagon/HexagonSelectionDAGInfo.cpp')
-rw-r--r-- | contrib/llvm/lib/Target/Hexagon/HexagonSelectionDAGInfo.cpp | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Target/Hexagon/HexagonSelectionDAGInfo.cpp b/contrib/llvm/lib/Target/Hexagon/HexagonSelectionDAGInfo.cpp new file mode 100644 index 000000000000..002e87fb32ce --- /dev/null +++ b/contrib/llvm/lib/Target/Hexagon/HexagonSelectionDAGInfo.cpp @@ -0,0 +1,64 @@ +//===-- HexagonSelectionDAGInfo.cpp - Hexagon SelectionDAG Info -----------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements the HexagonSelectionDAGInfo class. +// +//===----------------------------------------------------------------------===// + +#include "HexagonTargetMachine.h" +#include "llvm/CodeGen/SelectionDAG.h" +using namespace llvm; + +#define DEBUG_TYPE "hexagon-selectiondag-info" + +SDValue HexagonSelectionDAGInfo::EmitTargetCodeForMemcpy( + SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Dst, SDValue Src, + SDValue Size, unsigned Align, bool isVolatile, bool AlwaysInline, + MachinePointerInfo DstPtrInfo, MachinePointerInfo SrcPtrInfo) const { + ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size); + if (AlwaysInline || (Align & 0x3) != 0 || !ConstantSize) + return SDValue(); + + uint64_t SizeVal = ConstantSize->getZExtValue(); + if (SizeVal < 32 || (SizeVal % 8) != 0) + return SDValue(); + + // Special case aligned memcpys with size >= 32 bytes and a multiple of 8. + // + const TargetLowering &TLI = *DAG.getSubtarget().getTargetLowering(); + TargetLowering::ArgListTy Args; + TargetLowering::ArgListEntry Entry; + Entry.Ty = DAG.getDataLayout().getIntPtrType(*DAG.getContext()); + Entry.Node = Dst; + Args.push_back(Entry); + Entry.Node = Src; + Args.push_back(Entry); + Entry.Node = Size; + Args.push_back(Entry); + + const char *SpecialMemcpyName = + "__hexagon_memcpy_likely_aligned_min32bytes_mult8bytes"; + const MachineFunction &MF = DAG.getMachineFunction(); + bool LongCalls = MF.getSubtarget<HexagonSubtarget>().useLongCalls(); + unsigned Flags = LongCalls ? HexagonII::HMOTF_ConstExtended : 0; + + TargetLowering::CallLoweringInfo CLI(DAG); + CLI.setDebugLoc(dl) + .setChain(Chain) + .setLibCallee( + TLI.getLibcallCallingConv(RTLIB::MEMCPY), + Type::getVoidTy(*DAG.getContext()), + DAG.getTargetExternalSymbol( + SpecialMemcpyName, TLI.getPointerTy(DAG.getDataLayout()), Flags), + std::move(Args)) + .setDiscardResult(); + + std::pair<SDValue, SDValue> CallResult = TLI.LowerCallTo(CLI); + return CallResult.second; +} |