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Add compare operators to BranchProbability and use it to determine if an edge is hot.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142751 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2011-10-23 11:19:14 +00:00
parent 3071363bcd
commit 341473c86d
4 changed files with 40 additions and 17 deletions
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18
include/llvm/Support/BranchProbability.h
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@@ -15,6 +15,7 @@
#define LLVM_SUPPORT_BRANCHPROBABILITY_H
#include "llvm/Support/DataTypes.h"
#include <cassert>
namespace llvm {
@@ -22,15 +23,21 @@ 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);
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!");
}
uint32_t getNumerator() const { return N; }
uint32_t getDenominator() const { return D; }
@@ -43,6 +50,13 @@ public:
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);