diff options
| author | Benjamin Barenblat <bbaren@google.com> | 2023-05-08 12:51:08 -0400 |
|---|---|---|
| committer | Benjamin Barenblat <bbaren@google.com> | 2023-05-08 12:51:08 -0400 |
| commit | c15cec707b1c7d847e59d2db4d0b82b711a7ee6d (patch) | |
| tree | 79f448d5bbc8cf52917b0b091f0e1ab60a419c85 /absl/base/internal/cycleclock.h | |
| parent | f4f2c1da90c4e6a0683c4e66c0268baa1b79cdf3 (diff) | |
| parent | c2435f8342c2d0ed8101cb43adfd605fdc52dca2 (diff) | |
| download | abseil-c15cec707b1c7d847e59d2db4d0b82b711a7ee6d.tar.gz abseil-c15cec707b1c7d847e59d2db4d0b82b711a7ee6d.tar.bz2 abseil-c15cec707b1c7d847e59d2db4d0b82b711a7ee6d.zip | |
Merge new upstream LTS 20230125.3
Diffstat (limited to 'absl/base/internal/cycleclock.h')
| -rw-r--r-- | absl/base/internal/cycleclock.h | 21 |
1 files changed, 3 insertions, 18 deletions
diff --git a/absl/base/internal/cycleclock.h b/absl/base/internal/cycleclock.h index 9704e388..cbfdf579 100644 --- a/absl/base/internal/cycleclock.h +++ b/absl/base/internal/cycleclock.h @@ -47,6 +47,7 @@ #include "absl/base/attributes.h" #include "absl/base/config.h" +#include "absl/base/internal/cycleclock_config.h" #include "absl/base/internal/unscaledcycleclock.h" namespace absl { @@ -76,25 +77,9 @@ class CycleClock { #if ABSL_USE_UNSCALED_CYCLECLOCK static CycleClockSourceFunc LoadCycleClockSource(); -#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. - static constexpr int32_t kShift = 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. - static constexpr int32_t kShift = 0; -#endif -#else // NDEBUG - // In debug mode use a different shift to discourage depending on a - // particular shift value. - static constexpr int32_t kShift = 2; -#endif // NDEBUG + static constexpr int32_t kShift = kCycleClockShift; + static constexpr double kFrequencyScale = kCycleClockFrequencyScale; - static constexpr double kFrequencyScale = 1.0 / (1 << kShift); ABSL_CONST_INIT static std::atomic<CycleClockSourceFunc> cycle_clock_source_; #endif // ABSL_USE_UNSCALED_CYCLECLOC |