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//===- BranchProbability.h - Branch Probability Wrapper ---------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Definition of BranchProbability shared by IR and Machine Instructions.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_BRANCHPROBABILITY_H
#define LLVM_SUPPORT_BRANCHPROBABILITY_H
#include "llvm/Support/DataTypes.h"
#include <cassert>
namespace llvm {
class raw_ostream;
// This class represents Branch Probability as a non-negative fraction.
class BranchProbability {
// Numerator
uint32_t N;
// Denominator
uint32_t D;
int64_t compare(BranchProbability RHS) const {
return (uint64_t)N * RHS.D - (uint64_t)D * RHS.N;
}
public:
BranchProbability(uint32_t n, uint32_t d) : N(n), D(d) {
assert(d > 0 && "Denomiator cannot be 0!");
assert(n <= d && "Probability cannot be bigger than 1!");
}
static BranchProbability getZero() { return BranchProbability(0, 1); }
static BranchProbability getOne() { return BranchProbability(1, 1); }
uint32_t getNumerator() const { return N; }
uint32_t getDenominator() const { return D; }
// Return (1 - Probability).
BranchProbability getCompl() {
return BranchProbability(D - N, D);
}
void print(raw_ostream &OS) const;
void dump() const;
bool operator==(BranchProbability RHS) const { return compare(RHS) == 0; }
bool operator!=(BranchProbability RHS) const { return compare(RHS) != 0; }
bool operator< (BranchProbability RHS) const { return compare(RHS) < 0; }
bool operator> (BranchProbability RHS) const { return compare(RHS) > 0; }
bool operator<=(BranchProbability RHS) const { return compare(RHS) <= 0; }
bool operator>=(BranchProbability RHS) const { return compare(RHS) >= 0; }
};
raw_ostream &operator<<(raw_ostream &OS, const BranchProbability &Prob);
}
#endif
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