mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-10-31 08:16:47 +00:00
c26292d4dc
Summary: If the src, dst and size of a memcpy are known to be 4 byte aligned we can call __memcpy_4() instead of memcpy(). Reviewers: robertlytton Reviewed By: robertlytton CC: llvm-commits Differential Revision: http://llvm-reviews.chandlerc.com/D2871 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202395 91177308-0d34-0410-b5e6-96231b3b80d8
57 lines
2.2 KiB
C++
57 lines
2.2 KiB
C++
//===-- XCoreSelectionDAGInfo.cpp - XCore 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 XCoreSelectionDAGInfo class.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#define DEBUG_TYPE "xcore-selectiondag-info"
|
|
#include "XCoreTargetMachine.h"
|
|
using namespace llvm;
|
|
|
|
XCoreSelectionDAGInfo::XCoreSelectionDAGInfo(const XCoreTargetMachine &TM)
|
|
: TargetSelectionDAGInfo(TM) {
|
|
}
|
|
|
|
XCoreSelectionDAGInfo::~XCoreSelectionDAGInfo() {
|
|
}
|
|
|
|
SDValue XCoreSelectionDAGInfo::
|
|
EmitTargetCodeForMemcpy(SelectionDAG &DAG, SDLoc dl, SDValue Chain,
|
|
SDValue Dst, SDValue Src, SDValue Size, unsigned Align,
|
|
bool isVolatile, bool AlwaysInline,
|
|
MachinePointerInfo DstPtrInfo,
|
|
MachinePointerInfo SrcPtrInfo) const
|
|
{
|
|
unsigned SizeBitWidth = Size.getValueType().getSizeInBits();
|
|
// Call __memcpy_4 if the src, dst and size are all 4 byte aligned.
|
|
if (!AlwaysInline && (Align & 3) == 0 &&
|
|
DAG.MaskedValueIsZero(Size, APInt(SizeBitWidth, 3))) {
|
|
const TargetLowering &TLI = *DAG.getTarget().getTargetLowering();
|
|
TargetLowering::ArgListTy Args;
|
|
TargetLowering::ArgListEntry Entry;
|
|
Entry.Ty = TLI.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);
|
|
|
|
TargetLowering::CallLoweringInfo
|
|
CLI(Chain, Type::getVoidTy(*DAG.getContext()), false, false, false, false,
|
|
0, TLI.getLibcallCallingConv(RTLIB::MEMCPY), /*isTailCall=*/false,
|
|
/*doesNotRet=*/false, /*isReturnValueUsed=*/false,
|
|
DAG.getExternalSymbol("__memcpy_4", TLI.getPointerTy()), Args, DAG, dl);
|
|
std::pair<SDValue,SDValue> CallResult =
|
|
TLI.LowerCallTo(CLI);
|
|
return CallResult.second;
|
|
}
|
|
|
|
// Otherwise have the target-independent code call memcpy.
|
|
return SDValue();
|
|
}
|