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//===-- SystemZSelectionDAGInfo.cpp - SystemZ 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 SystemZSelectionDAGInfo class.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "systemz-selectiondag-info"
#include "SystemZTargetMachine.h"
#include "llvm/CodeGen/SelectionDAG.h"
using namespace llvm;
SystemZSelectionDAGInfo::
SystemZSelectionDAGInfo(const SystemZTargetMachine &TM)
: TargetSelectionDAGInfo(TM) {
}
SystemZSelectionDAGInfo::~SystemZSelectionDAGInfo() {
}
SDValue SystemZSelectionDAGInfo::
EmitTargetCodeForMemcpy(SelectionDAG &DAG, SDLoc DL, SDValue Chain,
SDValue Dst, SDValue Src, SDValue Size, unsigned Align,
bool IsVolatile, bool AlwaysInline,
MachinePointerInfo DstPtrInfo,
MachinePointerInfo SrcPtrInfo) const {
if (IsVolatile)
return SDValue();
if (ConstantSDNode *CSize = dyn_cast<ConstantSDNode>(Size)) {
uint64_t Bytes = CSize->getZExtValue();
if (Bytes >= 1 && Bytes <= 0x100) {
// A single MVC.
return DAG.getNode(SystemZISD::MVC, DL, MVT::Other,
Chain, Dst, Src, Size);
}
}
return SDValue();
}
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