// 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_UNSCALEDCYCLECLOCK_CONFIG_H_ #define ABSL_BASE_INTERNAL_UNSCALEDCYCLECLOCK_CONFIG_H_ #if defined(__APPLE__) #include <TargetConditionals.h> #endif // 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(_M_ARM64EC)) #define ABSL_HAVE_UNSCALED_CYCLECLOCK_IMPLEMENTATION … #else #define ABSL_HAVE_UNSCALED_CYCLECLOCK_IMPLEMENTATION … #endif // The following platforms often disable access to the hardware // counter (through a sandbox) even if the underlying hardware has a // usable counter. The CycleTimer interface also requires a *scaled* // 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(__APPLE__)) || \ (defined(__ANDROID__) && defined(__aarch64__)) #define ABSL_USE_UNSCALED_CYCLECLOCK_DEFAULT … #else #define ABSL_USE_UNSCALED_CYCLECLOCK_DEFAULT … #endif // UnscaledCycleClock is an optional internal feature. // Use "#if ABSL_USE_UNSCALED_CYCLECLOCK" to test for its presence. // Can be overridden at compile-time via -DABSL_USE_UNSCALED_CYCLECLOCK=0|1 #if !defined(ABSL_USE_UNSCALED_CYCLECLOCK) #define ABSL_USE_UNSCALED_CYCLECLOCK … #endif #if ABSL_USE_UNSCALED_CYCLECLOCK // 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)) #define ABSL_INTERNAL_UNSCALED_CYCLECLOCK_FREQUENCY_IS_CPU_FREQUENCY #endif #endif #endif // ABSL_BASE_INTERNAL_UNSCALEDCYCLECLOCK_CONFIG_H_