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47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
//===------------ ProfileCounter.h - PGO Propfile counter -------*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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/// \file Declares ProfileCounter, a convenient type for PGO
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_BASIC_PROFILECOUNTER_H
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#define SWIFT_BASIC_PROFILECOUNTER_H
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#include <cassert>
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#include <cstdint>
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namespace swift {
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/// A class designed to be smaller than using Optional<uint64_t> for PGO
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class ProfileCounter {
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private:
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uint64_t count;
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public:
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explicit ProfileCounter() : count(UINT64_MAX) {}
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ProfileCounter(uint64_t Count) : count(Count) {
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if (Count == UINT64_MAX) {
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count = UINT64_MAX - 1;
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}
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}
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bool hasValue() const { return count != UINT64_MAX; }
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uint64_t getValue() const {
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assert(hasValue());
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return count;
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}
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explicit operator bool() const { return hasValue(); }
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};
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} // end namespace swift
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#endif // SWIFT_BASIC_PROFILECOUNTER_H
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