mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-31 10:29:25 +00:00
a17768f582
splitting or spillling, and to help with rematerialization. Use LiveRangeEdit in InlineSpiller and SplitKit. This will eventually make it possible to share remat code between InlineSpiller and SplitKit. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116543 91177308-0d34-0410-b5e6-96231b3b80d8
71 lines
2.5 KiB
C++
71 lines
2.5 KiB
C++
//===---- LiveRangeEdit.h - Basic tools for split and spill -----*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// The LiveRangeEdit class represents changes done to a virtual register when it
|
|
// is spilled or split.
|
|
//
|
|
// The parent register is never changed. Instead, a number of new virtual
|
|
// registers are created and added to the newRegs vector.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_CODEGEN_LIVERANGEEDIT_H
|
|
#define LLVM_CODEGEN_LIVERANGEEDIT_H
|
|
|
|
#include "llvm/CodeGen/LiveInterval.h"
|
|
|
|
namespace llvm {
|
|
|
|
class LiveIntervals;
|
|
class MachineRegisterInfo;
|
|
class VirtRegMap;
|
|
|
|
class LiveRangeEdit {
|
|
LiveInterval &parent_;
|
|
SmallVectorImpl<LiveInterval*> &newRegs_;
|
|
const SmallVectorImpl<LiveInterval*> &uselessRegs_;
|
|
|
|
/// firstNew_ - Index of the first register added to newRegs_.
|
|
const unsigned firstNew_;
|
|
|
|
public:
|
|
/// Create a LiveRangeEdit for breaking down parent into smaller pieces.
|
|
/// @param parent The register being spilled or split.
|
|
/// @param newRegs List to receive any new registers created. This needn't be
|
|
/// empty initially, any existing registers are ignored.
|
|
/// @param uselessRegs List of registers that can't be used when
|
|
/// rematerializing values because they are about to be removed.
|
|
LiveRangeEdit(LiveInterval &parent,
|
|
SmallVectorImpl<LiveInterval*> &newRegs,
|
|
const SmallVectorImpl<LiveInterval*> &uselessRegs)
|
|
: parent_(parent), newRegs_(newRegs), uselessRegs_(uselessRegs),
|
|
firstNew_(newRegs.size()) {}
|
|
|
|
LiveInterval &getParent() const { return parent_; }
|
|
unsigned getReg() const { return parent_.reg; }
|
|
|
|
/// Iterator for accessing the new registers added by this edit.
|
|
typedef SmallVectorImpl<LiveInterval*>::const_iterator iterator;
|
|
iterator begin() const { return newRegs_.begin()+firstNew_; }
|
|
iterator end() const { return newRegs_.end(); }
|
|
|
|
/// create - Create a new register with the same class as parentReg_.
|
|
LiveInterval &create(MachineRegisterInfo&, LiveIntervals&, VirtRegMap&);
|
|
|
|
/// allUsesAvailableAt - Return true if all registers used by OrigMI at
|
|
/// OrigIdx are also available with the same value at UseIdx.
|
|
bool allUsesAvailableAt(const MachineInstr *OrigMI, SlotIndex OrigIdx,
|
|
SlotIndex UseIdx, LiveIntervals &lis);
|
|
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|