diff options
Diffstat (limited to 'absl/base/internal/unscaledcycleclock.h')
| -rw-r--r-- | absl/base/internal/unscaledcycleclock.h | 27 |
1 files changed, 18 insertions, 9 deletions
diff --git a/absl/base/internal/unscaledcycleclock.h b/absl/base/internal/unscaledcycleclock.h index cdce9bf8..2cbeae31 100644 --- a/absl/base/internal/unscaledcycleclock.h +++ b/absl/base/internal/unscaledcycleclock.h @@ -15,8 +15,8 @@ // UnscaledCycleClock // An UnscaledCycleClock yields the value and frequency of a cycle counter // that increments at a rate that is approximately constant. -// This class is for internal / whitelisted use only, you should consider -// using CycleClock instead. +// This class is for internal use only, you should consider using CycleClock +// instead. // // Notes: // The cycle counter frequency is not necessarily the core clock frequency. @@ -46,8 +46,8 @@ // The following platforms have an implementation of a hardware counter. #if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__) || \ - defined(__powerpc__) || defined(__ppc__) || \ - defined(_M_IX86) || defined(_M_X64) + defined(__powerpc__) || defined(__ppc__) || defined(__riscv) || \ + defined(_M_IX86) || (defined(_M_X64) && !defined(_M_ARM64EC)) #define ABSL_HAVE_UNSCALED_CYCLECLOCK_IMPLEMENTATION 1 #else #define ABSL_HAVE_UNSCALED_CYCLECLOCK_IMPLEMENTATION 0 @@ -59,8 +59,7 @@ // CycleClock that runs at atleast 1 MHz. We've found some Android // ARM64 devices where this is not the case, so we disable it by // default on Android ARM64. -#if defined(__native_client__) || \ - (defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE) || \ +#if defined(__native_client__) || (defined(__APPLE__)) || \ (defined(__ANDROID__) && defined(__aarch64__)) #define ABSL_USE_UNSCALED_CYCLECLOCK_DEFAULT 0 #else @@ -80,8 +79,8 @@ // This macro can be used to test if UnscaledCycleClock::Frequency() // is NominalCPUFrequency() on a particular platform. -#if (defined(__i386__) || defined(__x86_64__) || \ - defined(_M_IX86) || defined(_M_X64)) +#if (defined(__i386__) || defined(__x86_64__) || defined(__riscv) || \ + defined(_M_IX86) || defined(_M_X64)) #define ABSL_INTERNAL_UNSCALED_CYCLECLOCK_FREQUENCY_IS_CPU_FREQUENCY #endif @@ -109,12 +108,22 @@ class UnscaledCycleClock { // value. static double Frequency(); - // Whitelisted friends. + // Allowed users friend class base_internal::CycleClock; friend class time_internal::UnscaledCycleClockWrapperForGetCurrentTime; friend class base_internal::UnscaledCycleClockWrapperForInitializeFrequency; }; +#if defined(__x86_64__) + +inline int64_t UnscaledCycleClock::Now() { + uint64_t low, high; + __asm__ volatile("rdtsc" : "=a"(low), "=d"(high)); + return (high << 32) | low; +} + +#endif + } // namespace base_internal ABSL_NAMESPACE_END } // namespace absl |