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Analyze the live range's behavior entering and leaving basic blocks. Compute an interference pattern for each allocation candidate, and use SpillPlacement to find an optimal region where that register can be live. This code is still not enabled. llvm-svn: 123774
109 lines
4.2 KiB
C++
109 lines
4.2 KiB
C++
//===-- SpillPlacement.h - Optimal Spill Code Placement --------*- 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 analysis computes the optimal spill code placement between basic blocks.
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//
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// The runOnMachineFunction() method only precomputes some profiling information
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// about the CFG. The real work is done by placeSpills() which is called by the
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// register allocator.
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//
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// Given a variable that is live across multiple basic blocks, and given
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// constraints on the basic blocks where the variable is live, determine which
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// edge bundles should have the variable in a register and which edge bundles
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// should have the variable in a stack slot.
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//
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// The returned bit vector can be used to place optimal spill code at basic
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// block entries and exits. Spill code placement inside a basic block is not
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// considered.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_SPILLPLACEMENT_H
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#define LLVM_CODEGEN_SPILLPLACEMENT_H
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#include "llvm/CodeGen/MachineFunctionPass.h"
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namespace llvm {
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class BitVector;
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class EdgeBundles;
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class MachineBasicBlock;
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class MachineLoopInfo;
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template <typename> class SmallVectorImpl;
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class SpillPlacement : public MachineFunctionPass {
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struct Node;
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const MachineFunction *MF;
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const EdgeBundles *bundles;
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const MachineLoopInfo *loops;
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Node *nodes;
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// Nodes that are active in the current computation. Owned by the placeSpills
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// caller.
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BitVector *ActiveNodes;
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public:
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static char ID; // Pass identification, replacement for typeid.
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SpillPlacement() : MachineFunctionPass(ID), nodes(0) {}
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~SpillPlacement() { releaseMemory(); }
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/// BorderConstraint - A basic block has separate constraints for entry and
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/// exit.
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enum BorderConstraint {
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DontCare, ///< Block doesn't care / variable not live.
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PrefReg, ///< Block entry/exit prefers a register.
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PrefSpill, ///< Block entry/exit prefers a stack slot.
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MustSpill ///< A register is impossible, variable must be spilled.
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};
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/// BlockConstraint - Entry and exit constraints for a basic block.
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struct BlockConstraint {
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unsigned Number; ///< Basic block number (from MBB::getNumber()).
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BorderConstraint Entry : 8; ///< Constraint on block entry.
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BorderConstraint Exit : 8; ///< Constraint on block exit.
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};
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/// placeSpills - Compute the optimal spill code placement given the
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/// constraints. No MustSpill constraints will be violated, and the smallest
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/// possible number of PrefX constraints will be violated, weighted by
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/// expected execution frequencies.
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/// @param LiveBlocks Constraints for blocks that have the variable live in or
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/// live out. DontCare/DontCare means the variable is live
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/// through the block. DontCare/X means the variable is live
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/// out, but not live in.
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/// @param RegBundles Bit vector to receive the edge bundles where the
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/// variable should be kept in a register. Each bit
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/// corresponds to an edge bundle, a set bit means the
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/// variable should be kept in a register through the
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/// bundle. A clear bit means the variable should be
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/// spilled.
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/// @return True if a perfect solution was found, allowing the variable to be
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/// in a register through all relevant bundles.
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bool placeSpills(const SmallVectorImpl<BlockConstraint> &LiveBlocks,
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BitVector &RegBundles);
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/// getBlockFrequency - Return the estimated block execution frequency per
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/// function invocation.
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float getBlockFrequency(const MachineBasicBlock*);
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private:
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virtual bool runOnMachineFunction(MachineFunction&);
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virtual void getAnalysisUsage(AnalysisUsage&) const;
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virtual void releaseMemory();
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void activate(unsigned);
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void prepareNodes(const SmallVectorImpl<BlockConstraint>&);
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void iterate(const SmallVectorImpl<unsigned>&);
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};
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} // end namespace llvm
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#endif
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