diff options
Diffstat (limited to 'absl/base/internal/unscaledcycleclock.h')
| -rw-r--r-- | absl/base/internal/unscaledcycleclock.h | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/absl/base/internal/unscaledcycleclock.h b/absl/base/internal/unscaledcycleclock.h index 681ff8f9..2cbeae31 100644 --- a/absl/base/internal/unscaledcycleclock.h +++ b/absl/base/internal/unscaledcycleclock.h @@ -47,7 +47,7 @@ // The following platforms have an implementation of a hardware counter. #if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__) || \ defined(__powerpc__) || defined(__ppc__) || defined(__riscv) || \ - defined(_M_IX86) || defined(_M_X64) + 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 @@ -115,6 +114,16 @@ class UnscaledCycleClock { 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 |