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23e36625a2
LoopDepth.cpp: new file that calculates the depth of a loop, using IntervalPartitions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71 91177308-0d34-0410-b5e6-96231b3b80d8
47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
//===- LoopDepth.cpp - Loop Dpeth Calculation --------------------*- C++ -*--=//
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//
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// This file provides a simple class to calculate the loop depth of a
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// BasicBlock.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/LoopDepth.h"
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#include "llvm/Analysis/IntervalPartition.h"
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#include "llvm/Tools/STLExtras.h"
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#include <algorithm>
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inline void LoopDepthCalculator::AddBB(const BasicBlock *BB) {
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++LoopDepth[BB]; // Increment the loop depth count for the specified BB
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}
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inline void LoopDepthCalculator::ProcessInterval(cfg::Interval *I) {
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if (!I->isLoop()) return; // Ignore nonlooping intervals...
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for_each(I->Nodes.begin(), I->Nodes.end(),
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bind_obj(this, &LoopDepthCalculator::AddBB));
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}
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LoopDepthCalculator::LoopDepthCalculator(Method *M) {
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//map<const BasicBlock*, unsigned> LoopDepth;
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cfg::IntervalPartition *IP = new cfg::IntervalPartition(M);
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while (!IP->isDegeneratePartition()) {
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for_each(IP->begin(), IP->end(),
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bind_obj(this, &LoopDepthCalculator::ProcessInterval));
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// Calculate the reduced version of this graph until we get to an
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// irreducible graph or a degenerate graph...
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//
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cfg::IntervalPartition *NewIP = new cfg::IntervalPartition(*IP, true);
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if (NewIP->size() == IP->size()) {
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cerr << "IRREDUCIBLE GRAPH FOUND!!!\n";
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// TODO: fix irreducible graph
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return;
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}
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delete IP;
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IP = NewIP;
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}
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delete IP;
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}
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