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When a call is placed to spill an interval this spiller will first try to break the interval up into its component values. Single value intervals and intervals which have already been split (or are the result of previous splits) are spilled by the default spiller. Splitting intervals as described above may improve the performance of generated code in some circumstances. This work is experimental however, and it still miscompiles many benchmarks. It's not recommended for general use yet. llvm-svn: 90951
50 lines
1.4 KiB
C++
50 lines
1.4 KiB
C++
//===-- llvm/CodeGen/Spiller.h - Spiller -*- C++ -*------------------------===//
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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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#ifndef LLVM_CODEGEN_SPILLER_H
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#define LLVM_CODEGEN_SPILLER_H
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#include "llvm/ADT/SmallVector.h"
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#include <vector>
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namespace llvm {
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class LiveInterval;
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class LiveIntervals;
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class LiveStacks;
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class MachineFunction;
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class MachineInstr;
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class MachineLoopInfo;
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class SlotIndex;
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class VirtRegMap;
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class VNInfo;
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/// Spiller interface.
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///
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/// Implementations are utility classes which insert spill or remat code on
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/// demand.
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class Spiller {
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public:
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virtual ~Spiller() = 0;
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/// Spill the given live range. The method used will depend on the Spiller
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/// implementation selected.
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virtual std::vector<LiveInterval*> spill(LiveInterval *li,
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SmallVectorImpl<LiveInterval*> &spillIs,
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SlotIndex *earliestIndex = 0) = 0;
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};
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/// Create and return a spiller object, as specified on the command line.
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Spiller* createSpiller(MachineFunction *mf, LiveIntervals *li,
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const MachineLoopInfo *loopInfo, VirtRegMap *vrm);
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}
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#endif
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