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//========-------- BlockFrequency.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_BLOCKFREQUENCY_H
#define LLVM_ANALYSIS_BLOCKFREQUENCY_H
#include "llvm/Pass.h"
#include <climits>
namespace llvm {
class BranchProbabilityInfo;
template<class BlockT, class FunctionT, class BranchProbInfoT>
class BlockFrequencyImpl;
/// BlockFrequency pass uses BlockFrequencyImpl implementation to estimate
/// IR basic block frequencies.
class BlockFrequency : public FunctionPass {
BlockFrequencyImpl<BasicBlock, Function, BranchProbabilityInfo> *BFI;
public:
static char ID;
BlockFrequency();
~BlockFrequency();
void getAnalysisUsage(AnalysisUsage &AU) const;
bool runOnFunction(Function &F);
/// getblockFreq - Return block frequency. Never return 0, value must be
/// positive. 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 the floating
/// points.
uint32_t getBlockFreq(BasicBlock *BB);
};
}
#endif
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