cycleclock_config.h

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// Copyright 2022 The Abseil Authors

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//     https://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

#ifndef ABSL_BASE_INTERNAL_CYCLECLOCK_CONFIG_H_

#define ABSL_BASE_INTERNAL_CYCLECLOCK_CONFIG_H_

#include <cstdint>

#include "absl/base/config.h"

#include "absl/base/internal/inline_variable.h"

#include "absl/base/internal/unscaledcycleclock_config.h"

namespace absl {

ABSL_NAMESPACE_BEGIN

namespace base_internal {

#if ABSL_USE_UNSCALED_CYCLECLOCK

#ifdef NDEBUG

#ifdef ABSL_INTERNAL_UNSCALED_CYCLECLOCK_FREQUENCY_IS_CPU_FREQUENCY

// Not debug mode and the UnscaledCycleClock frequency is the CPU

// frequency.  Scale the CycleClock to prevent overflow if someone

// tries to represent the time as cycles since the Unix epoch.

ABSL_INTERNAL_INLINE_CONSTEXPR(int32_t, kCycleClockShift, 1);

#else

// Not debug mode and the UnscaledCycleClock isn't operating at the

// raw CPU frequency. There is no need to do any scaling, so don't

// needlessly sacrifice precision.

ABSL_INTERNAL_INLINE_CONSTEXPR(int32_t, kCycleClockShift, 0);

#endif

#else   // NDEBUG

// In debug mode use a different shift to discourage depending on a

// particular shift value.

ABSL_INTERNAL_INLINE_CONSTEXPR(int32_t, kCycleClockShift, 2);

#endif  // NDEBUG

ABSL_INTERNAL_INLINE_CONSTEXPR(double, kCycleClockFrequencyScale,

                               1.0 / (1 << kCycleClockShift));

#endif  //  ABSL_USE_UNSCALED_CYCLECLOC

}  // namespace base_internal

ABSL_NAMESPACE_END

}  // namespace absl

#endif  // ABSL_BASE_INTERNAL_CYCLECLOCK_CONFIG_H_