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//========-------- BlockFrequencyInfo.h - Block Frequency Analysis -------========//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Loops should be simplified before this analysis.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ANALYSIS_BLOCKFREQUENCYINFO_H
#define LLVM_ANALYSIS_BLOCKFREQUENCYINFO_H
#include "llvm/Pass.h"
#include "llvm/Support/BlockFrequency.h"
#include <climits>
namespace llvm {
class BranchProbabilityInfo;
template<class BlockT, class FunctionT, class BranchProbInfoT>
class BlockFrequencyImpl;
/// BlockFrequencyInfo pass uses BlockFrequencyImpl implementation to estimate
/// IR basic block frequencies.
class BlockFrequencyInfo : public FunctionPass {
BlockFrequencyImpl<BasicBlock, Function, BranchProbabilityInfo> *BFI;
public:
static char ID;
BlockFrequencyInfo();
~BlockFrequencyInfo();
void getAnalysisUsage(AnalysisUsage &AU) const;
bool runOnFunction(Function &F);
void print(raw_ostream &O, const Module *M) const;
/// getblockFreq - Return block frequency. Return 0 if we don't have the
/// information. Please note that initial frequency is equal to 1024. It means
/// that we should not rely on the value itself, but only on the comparison to
/// the other block frequencies. We do this to avoid using of floating points.
///
BlockFrequency getBlockFreq(BasicBlock *BB) const;
};
}
#endif
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