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https://github.com/c64scene-ar/llvm-6502.git
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dff0009d0c
Use MVC for memcpy in cases where a single MVC is enough. Using MVC is a win for longer copies too, but I'll leave that for later. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185802 91177308-0d34-0410-b5e6-96231b3b80d8
47 lines
1.5 KiB
C++
47 lines
1.5 KiB
C++
//===-- SystemZSelectionDAGInfo.cpp - SystemZ SelectionDAG Info -----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the SystemZSelectionDAGInfo class.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "systemz-selectiondag-info"
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#include "SystemZTargetMachine.h"
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#include "llvm/CodeGen/SelectionDAG.h"
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using namespace llvm;
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SystemZSelectionDAGInfo::
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SystemZSelectionDAGInfo(const SystemZTargetMachine &TM)
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: TargetSelectionDAGInfo(TM) {
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}
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SystemZSelectionDAGInfo::~SystemZSelectionDAGInfo() {
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}
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SDValue SystemZSelectionDAGInfo::
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EmitTargetCodeForMemcpy(SelectionDAG &DAG, SDLoc DL, SDValue Chain,
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SDValue Dst, SDValue Src, SDValue Size, unsigned Align,
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bool IsVolatile, bool AlwaysInline,
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MachinePointerInfo DstPtrInfo,
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MachinePointerInfo SrcPtrInfo) const {
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if (IsVolatile)
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return SDValue();
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if (ConstantSDNode *CSize = dyn_cast<ConstantSDNode>(Size)) {
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uint64_t Bytes = CSize->getZExtValue();
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if (Bytes >= 1 && Bytes <= 0x100) {
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// A single MVC.
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return DAG.getNode(SystemZISD::MVC, DL, MVT::Other,
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Chain, Dst, Src, Size);
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}
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}
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return SDValue();
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}
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