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The heuristics split around the largest loop where the current register may be allocated without interference. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122106 91177308-0d34-0410-b5e6-96231b3b80d8
113 lines
3.4 KiB
C++
113 lines
3.4 KiB
C++
//===- MachineLoopRanges.h - Ranges of machine loops -----------*- 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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//
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// This file provides the interface to the MachineLoopRanges analysis.
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//
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// Provide on-demand information about the ranges of machine instructions
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// covered by a loop.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_MACHINELOOPRANGES_H
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#define LLVM_CODEGEN_MACHINELOOPRANGES_H
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#include "llvm/ADT/IntervalMap.h"
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#include "llvm/CodeGen/SlotIndexes.h"
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namespace llvm {
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class MachineLoop;
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class MachineLoopInfo;
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class raw_ostream;
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/// MachineLoopRange - Range information for a single loop.
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class MachineLoopRange {
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friend class MachineLoopRanges;
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public:
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typedef IntervalMap<SlotIndex, unsigned, 4> Map;
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typedef Map::Allocator Allocator;
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private:
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/// The mapped loop.
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const MachineLoop *const Loop;
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/// Map intervals to a bit mask.
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/// Bit 0 = inside loop block.
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Map Intervals;
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/// Loop area as measured by SlotIndex::distance.
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unsigned Area;
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/// Create a MachineLoopRange, only accessible to MachineLoopRanges.
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MachineLoopRange(const MachineLoop*, Allocator&, SlotIndexes&);
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public:
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/// getLoop - Return the mapped machine loop.
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const MachineLoop *getLoop() const { return Loop; }
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/// overlaps - Return true if this loop overlaps the given range of machine
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/// inteructions.
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bool overlaps(SlotIndex Start, SlotIndex Stop);
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/// getNumber - Return the loop number. This is the same as the number of the
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/// header block.
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unsigned getNumber() const;
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/// getArea - Return the loop area. This number is approximately proportional
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/// to the number of instructions in the loop.
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unsigned getArea() const { return Area; }
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/// getMap - Allow public read-only access for IntervalMapOverlaps.
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const Map &getMap() { return Intervals; }
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/// print - Print loop ranges on OS.
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void print(raw_ostream&) const;
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/// byNumber - Comparator for array_pod_sort that sorts a list of
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/// MachineLoopRange pointers by number.
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static int byNumber(const void*, const void*);
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/// byAreaDesc - Comparator for array_pod_sort that sorts a list of
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/// MachineLoopRange pointers by descending area, then by number.
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static int byAreaDesc(const void*, const void*);
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};
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raw_ostream &operator<<(raw_ostream&, const MachineLoopRange&);
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/// MachineLoopRanges - Analysis pass that provides on-demand per-loop range
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/// information.
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class MachineLoopRanges : public MachineFunctionPass {
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typedef DenseMap<const MachineLoop*, MachineLoopRange*> CacheMap;
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typedef MachineLoopRange::Allocator MapAllocator;
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MapAllocator Allocator;
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SlotIndexes *Indexes;
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CacheMap Cache;
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public:
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static char ID; // Pass identification, replacement for typeid
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MachineLoopRanges() : MachineFunctionPass(ID), Indexes(0) {}
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~MachineLoopRanges() { releaseMemory(); }
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/// getLoopRange - Return the range of loop.
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MachineLoopRange *getLoopRange(const MachineLoop *Loop);
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private:
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virtual bool runOnMachineFunction(MachineFunction&);
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virtual void releaseMemory();
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virtual void getAnalysisUsage(AnalysisUsage&) const;
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};
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} // end namespace llvm
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#endif // LLVM_CODEGEN_MACHINELOOPRANGES_H
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