Abseil Common Libraries (C++) (grcp 依赖)
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63 lines
2.5 KiB
63 lines
2.5 KiB
2 years ago
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// Copyright 2022 The Abseil Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef ABSL_BASE_INTERNAL_UNSCALEDCYCLECLOCK_CONFIG_H_
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#define ABSL_BASE_INTERNAL_UNSCALEDCYCLECLOCK_CONFIG_H_
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#if defined(__APPLE__)
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#include <TargetConditionals.h>
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#endif
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// The following platforms have an implementation of a hardware counter.
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#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__) || \
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defined(__powerpc__) || defined(__ppc__) || defined(__riscv) || \
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defined(_M_IX86) || (defined(_M_X64) && !defined(_M_ARM64EC))
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#define ABSL_HAVE_UNSCALED_CYCLECLOCK_IMPLEMENTATION 1
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#else
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#define ABSL_HAVE_UNSCALED_CYCLECLOCK_IMPLEMENTATION 0
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#endif
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// The following platforms often disable access to the hardware
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// counter (through a sandbox) even if the underlying hardware has a
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// usable counter. The CycleTimer interface also requires a *scaled*
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// CycleClock that runs at atleast 1 MHz. We've found some Android
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// ARM64 devices where this is not the case, so we disable it by
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// default on Android ARM64.
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#if defined(__native_client__) || (defined(__APPLE__)) || \
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(defined(__ANDROID__) && defined(__aarch64__))
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#define ABSL_USE_UNSCALED_CYCLECLOCK_DEFAULT 0
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#else
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#define ABSL_USE_UNSCALED_CYCLECLOCK_DEFAULT 1
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#endif
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// UnscaledCycleClock is an optional internal feature.
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// Use "#if ABSL_USE_UNSCALED_CYCLECLOCK" to test for its presence.
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// Can be overridden at compile-time via -DABSL_USE_UNSCALED_CYCLECLOCK=0|1
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#if !defined(ABSL_USE_UNSCALED_CYCLECLOCK)
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#define ABSL_USE_UNSCALED_CYCLECLOCK \
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(ABSL_HAVE_UNSCALED_CYCLECLOCK_IMPLEMENTATION && \
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ABSL_USE_UNSCALED_CYCLECLOCK_DEFAULT)
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#endif
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#if ABSL_USE_UNSCALED_CYCLECLOCK
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// This macro can be used to test if UnscaledCycleClock::Frequency()
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// is NominalCPUFrequency() on a particular platform.
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#if (defined(__i386__) || defined(__x86_64__) || defined(__riscv) || \
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defined(_M_IX86) || defined(_M_X64))
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#define ABSL_INTERNAL_UNSCALED_CYCLECLOCK_FREQUENCY_IS_CPU_FREQUENCY
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#endif
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#endif
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#endif // ABSL_BASE_INTERNAL_UNSCALEDCYCLECLOCK_CONFIG_H_
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