2011-12-13 05:14:40 +08:00
|
|
|
//===-- 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"
|
2015-12-17 01:29:37 +08:00
|
|
|
#include "llvm/CodeGen/SelectionDAG.h"
|
2011-12-13 05:14:40 +08:00
|
|
|
using namespace llvm;
|
|
|
|
|
2014-04-22 10:41:26 +08:00
|
|
|
#define DEBUG_TYPE "hexagon-selectiondag-info"
|
|
|
|
|
2011-12-13 05:14:40 +08:00
|
|
|
SDValue
|
|
|
|
HexagonSelectionDAGInfo::
|
2013-05-25 10:42:55 +08:00
|
|
|
EmitTargetCodeForMemcpy(SelectionDAG &DAG, SDLoc dl, SDValue Chain,
|
2011-12-13 05:14:40 +08:00
|
|
|
SDValue Dst, SDValue Src, SDValue Size, unsigned Align,
|
|
|
|
bool isVolatile, bool AlwaysInline,
|
|
|
|
MachinePointerInfo DstPtrInfo,
|
|
|
|
MachinePointerInfo SrcPtrInfo) const {
|
2015-12-17 01:29:37 +08:00
|
|
|
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";
|
|
|
|
|
|
|
|
TargetLowering::CallLoweringInfo CLI(DAG);
|
|
|
|
CLI.setDebugLoc(dl)
|
|
|
|
.setChain(Chain)
|
|
|
|
.setCallee(TLI.getLibcallCallingConv(RTLIB::MEMCPY),
|
|
|
|
Type::getVoidTy(*DAG.getContext()),
|
|
|
|
DAG.getTargetExternalSymbol(
|
|
|
|
SpecialMemcpyName, TLI.getPointerTy(DAG.getDataLayout())),
|
|
|
|
std::move(Args), 0)
|
|
|
|
.setDiscardResult();
|
|
|
|
|
|
|
|
std::pair<SDValue, SDValue> CallResult = TLI.LowerCallTo(CLI);
|
|
|
|
return CallResult.second;
|
2011-12-13 05:14:40 +08:00
|
|
|
}
|