mirror of
https://github.com/abseil/abseil-cpp.git
synced 2026-06-04 12:07:05 +08:00
1a259163cc
Imported from GitHub PR https://github.com/abseil/abseil-cpp/pull/1961 We maintain the V8 Js Compiler on IBM platforms which uses abseil as a dependency. We have recently switched to using Clang and need to create this patch to fix two warnings: ``` warning: implicit conversion changes signedness: 'uint64_t' (aka 'unsigned long') to 'int64_t' (aka 'long') [-Wsign-conversion] warning: implicit conversion loses integer precision: 'uintptr_t' (aka 'unsigned long') to 'int' [-Wshorten-64-to-32] ``` Merge2e972b5c72intod71fcd13f6Merging this change closes #1961 COPYBARA_INTEGRATE_REVIEW=https://github.com/abseil/abseil-cpp/pull/1961 from miladfarca:ppc-fix-clang-warn2e972b5c72PiperOrigin-RevId: 823581713 Change-Id: Icff10b99b3808f51866fb97576af405826742088
135 lines
3.4 KiB
C++
135 lines
3.4 KiB
C++
// Copyright 2017 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.
|
|
|
|
#include "absl/base/internal/unscaledcycleclock.h"
|
|
|
|
#if ABSL_USE_UNSCALED_CYCLECLOCK
|
|
|
|
#if defined(_WIN32)
|
|
#include <intrin.h>
|
|
#endif
|
|
|
|
#if defined(__powerpc__) || defined(__ppc__)
|
|
#ifdef __GLIBC__
|
|
#include <sys/platform/ppc.h>
|
|
#elif defined(__FreeBSD__)
|
|
// clang-format off
|
|
// This order does actually matter =(.
|
|
#include <sys/types.h>
|
|
#include <sys/sysctl.h>
|
|
// clang-format on
|
|
|
|
#include "absl/base/call_once.h"
|
|
#endif
|
|
#endif
|
|
|
|
#include "absl/base/internal/sysinfo.h"
|
|
|
|
namespace absl {
|
|
ABSL_NAMESPACE_BEGIN
|
|
namespace base_internal {
|
|
|
|
#if defined(__i386__)
|
|
|
|
int64_t UnscaledCycleClock::Now() {
|
|
int64_t ret;
|
|
__asm__ volatile("rdtsc" : "=A"(ret));
|
|
return ret;
|
|
}
|
|
|
|
double UnscaledCycleClock::Frequency() {
|
|
return base_internal::NominalCPUFrequency();
|
|
}
|
|
|
|
#elif defined(__x86_64__)
|
|
|
|
double UnscaledCycleClock::Frequency() {
|
|
return base_internal::NominalCPUFrequency();
|
|
}
|
|
|
|
#elif defined(__powerpc__) || defined(__ppc__)
|
|
|
|
int64_t UnscaledCycleClock::Now() {
|
|
#ifdef __GLIBC__
|
|
return static_cast<int64_t>(__ppc_get_timebase());
|
|
#else
|
|
#ifdef __powerpc64__
|
|
int64_t tbr;
|
|
asm volatile("mfspr %0, 268" : "=r"(tbr));
|
|
return tbr;
|
|
#else
|
|
int32_t tbu, tbl, tmp;
|
|
asm volatile(
|
|
"mftbu %[hi32]\n"
|
|
"mftb %[lo32]\n"
|
|
"mftbu %[tmp]\n"
|
|
"cmpw %[tmp],%[hi32]\n"
|
|
"bne $-16\n" // Retry on failure.
|
|
: [hi32] "=r"(tbu), [lo32] "=r"(tbl), [tmp] "=r"(tmp));
|
|
return (static_cast<int64_t>(tbu) << 32) | tbl;
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
double UnscaledCycleClock::Frequency() {
|
|
#ifdef __GLIBC__
|
|
return __ppc_get_timebase_freq();
|
|
#elif defined(__linux__)
|
|
// Fallback for musl + ppc64le: use constant timebase frequency (512 MHz)
|
|
// Must come after __GLIBC__.
|
|
return static_cast<double>(512000000);
|
|
#elif defined(_AIX)
|
|
// This is the same constant value as returned by
|
|
// __ppc_get_timebase_freq().
|
|
return static_cast<double>(512000000);
|
|
#elif defined(__FreeBSD__)
|
|
static once_flag init_timebase_frequency_once;
|
|
static double timebase_frequency = 0.0;
|
|
base_internal::LowLevelCallOnce(&init_timebase_frequency_once, [&]() {
|
|
size_t length = sizeof(timebase_frequency);
|
|
sysctlbyname("kern.timecounter.tc.timebase.frequency", &timebase_frequency,
|
|
&length, nullptr, 0);
|
|
});
|
|
return timebase_frequency;
|
|
#else
|
|
#error Must implement UnscaledCycleClock::Frequency()
|
|
#endif
|
|
}
|
|
|
|
#elif defined(__aarch64__)
|
|
|
|
double UnscaledCycleClock::Frequency() {
|
|
uint64_t aarch64_timer_frequency;
|
|
asm volatile("mrs %0, cntfrq_el0" : "=r"(aarch64_timer_frequency));
|
|
return aarch64_timer_frequency;
|
|
}
|
|
|
|
#elif defined(_M_IX86) || defined(_M_X64)
|
|
|
|
#pragma intrinsic(__rdtsc)
|
|
|
|
int64_t UnscaledCycleClock::Now() { return __rdtsc(); }
|
|
|
|
double UnscaledCycleClock::Frequency() {
|
|
return base_internal::NominalCPUFrequency();
|
|
}
|
|
|
|
#endif
|
|
|
|
} // namespace base_internal
|
|
ABSL_NAMESPACE_END
|
|
} // namespace absl
|
|
|
|
#endif // ABSL_USE_UNSCALED_CYCLECLOCK
|