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Diffstat (limited to 'third-party/benchmark/src/cycleclock.h')
| -rw-r--r-- | third-party/benchmark/src/cycleclock.h | 225 |
1 files changed, 0 insertions, 225 deletions
diff --git a/third-party/benchmark/src/cycleclock.h b/third-party/benchmark/src/cycleclock.h deleted file mode 100644 index f22ca9f7d299..000000000000 --- a/third-party/benchmark/src/cycleclock.h +++ /dev/null @@ -1,225 +0,0 @@ -// ---------------------------------------------------------------------- -// CycleClock -// A CycleClock tells you the current time in Cycles. The "time" -// is actually time since power-on. This is like time() but doesn't -// involve a system call and is much more precise. -// -// NOTE: Not all cpu/platform/kernel combinations guarantee that this -// clock increments at a constant rate or is synchronized across all logical -// cpus in a system. -// -// If you need the above guarantees, please consider using a different -// API. There are efforts to provide an interface which provides a millisecond -// granularity and implemented as a memory read. A memory read is generally -// cheaper than the CycleClock for many architectures. -// -// Also, in some out of order CPU implementations, the CycleClock is not -// serializing. So if you're trying to count at cycles granularity, your -// data might be inaccurate due to out of order instruction execution. -// ---------------------------------------------------------------------- - -#ifndef BENCHMARK_CYCLECLOCK_H_ -#define BENCHMARK_CYCLECLOCK_H_ - -#include <cstdint> - -#include "benchmark/benchmark.h" -#include "internal_macros.h" - -#if defined(BENCHMARK_OS_MACOSX) -#include <mach/mach_time.h> -#endif -// For MSVC, we want to use '_asm rdtsc' when possible (since it works -// with even ancient MSVC compilers), and when not possible the -// __rdtsc intrinsic, declared in <intrin.h>. Unfortunately, in some -// environments, <windows.h> and <intrin.h> have conflicting -// declarations of some other intrinsics, breaking compilation. -// Therefore, we simply declare __rdtsc ourselves. See also -// http://connect.microsoft.com/VisualStudio/feedback/details/262047 -#if defined(COMPILER_MSVC) && !defined(_M_IX86) && !defined(_M_ARM64) -extern "C" uint64_t __rdtsc(); -#pragma intrinsic(__rdtsc) -#endif - -#if !defined(BENCHMARK_OS_WINDOWS) || defined(BENCHMARK_OS_MINGW) -#include <sys/time.h> -#include <time.h> -#endif - -#ifdef BENCHMARK_OS_EMSCRIPTEN -#include <emscripten.h> -#endif - -namespace benchmark { -// NOTE: only i386 and x86_64 have been well tested. -// PPC, sparc, alpha, and ia64 are based on -// http://peter.kuscsik.com/wordpress/?p=14 -// with modifications by m3b. See also -// https://setisvn.ssl.berkeley.edu/svn/lib/fftw-3.0.1/kernel/cycle.h -namespace cycleclock { -// This should return the number of cycles since power-on. Thread-safe. -inline BENCHMARK_ALWAYS_INLINE int64_t Now() { -#if defined(BENCHMARK_OS_MACOSX) - // this goes at the top because we need ALL Macs, regardless of - // architecture, to return the number of "mach time units" that - // have passed since startup. See sysinfo.cc where - // InitializeSystemInfo() sets the supposed cpu clock frequency of - // macs to the number of mach time units per second, not actual - // CPU clock frequency (which can change in the face of CPU - // frequency scaling). Also note that when the Mac sleeps, this - // counter pauses; it does not continue counting, nor does it - // reset to zero. - return mach_absolute_time(); -#elif defined(BENCHMARK_OS_EMSCRIPTEN) - // this goes above x86-specific code because old versions of Emscripten - // define __x86_64__, although they have nothing to do with it. - return static_cast<int64_t>(emscripten_get_now() * 1e+6); -#elif defined(__i386__) - int64_t ret; - __asm__ volatile("rdtsc" : "=A"(ret)); - return ret; -#elif defined(__x86_64__) || defined(__amd64__) - uint64_t low, high; - __asm__ volatile("rdtsc" : "=a"(low), "=d"(high)); - return (high << 32) | low; -#elif defined(__powerpc__) || defined(__ppc__) - // This returns a time-base, which is not always precisely a cycle-count. -#if defined(__powerpc64__) || defined(__ppc64__) - int64_t tb; - asm volatile("mfspr %0, 268" : "=r"(tb)); - return tb; -#else - uint32_t tbl, tbu0, tbu1; - asm volatile( - "mftbu %0\n" - "mftb %1\n" - "mftbu %2" - : "=r"(tbu0), "=r"(tbl), "=r"(tbu1)); - tbl &= -static_cast<int32_t>(tbu0 == tbu1); - // high 32 bits in tbu1; low 32 bits in tbl (tbu0 is no longer needed) - return (static_cast<uint64_t>(tbu1) << 32) | tbl; -#endif -#elif defined(__sparc__) - int64_t tick; - asm(".byte 0x83, 0x41, 0x00, 0x00"); - asm("mov %%g1, %0" : "=r"(tick)); - return tick; -#elif defined(__ia64__) - int64_t itc; - asm("mov %0 = ar.itc" : "=r"(itc)); - return itc; -#elif defined(COMPILER_MSVC) && defined(_M_IX86) - // Older MSVC compilers (like 7.x) don't seem to support the - // __rdtsc intrinsic properly, so I prefer to use _asm instead - // when I know it will work. Otherwise, I'll use __rdtsc and hope - // the code is being compiled with a non-ancient compiler. - _asm rdtsc -#elif defined(COMPILER_MSVC) && defined(_M_ARM64) - // See https://docs.microsoft.com/en-us/cpp/intrinsics/arm64-intrinsics?view=vs-2019 - // and https://reviews.llvm.org/D53115 - int64_t virtual_timer_value; - virtual_timer_value = _ReadStatusReg(ARM64_CNTVCT); - return virtual_timer_value; -#elif defined(COMPILER_MSVC) - return __rdtsc(); -#elif defined(BENCHMARK_OS_NACL) - // Native Client validator on x86/x86-64 allows RDTSC instructions, - // and this case is handled above. Native Client validator on ARM - // rejects MRC instructions (used in the ARM-specific sequence below), - // so we handle it here. Portable Native Client compiles to - // architecture-agnostic bytecode, which doesn't provide any - // cycle counter access mnemonics. - - // Native Client does not provide any API to access cycle counter. - // Use clock_gettime(CLOCK_MONOTONIC, ...) instead of gettimeofday - // because is provides nanosecond resolution (which is noticable at - // least for PNaCl modules running on x86 Mac & Linux). - // Initialize to always return 0 if clock_gettime fails. - struct timespec ts = {0, 0}; - clock_gettime(CLOCK_MONOTONIC, &ts); - return static_cast<int64_t>(ts.tv_sec) * 1000000000 + ts.tv_nsec; -#elif defined(__aarch64__) - // System timer of ARMv8 runs at a different frequency than the CPU's. - // The frequency is fixed, typically in the range 1-50MHz. It can be - // read at CNTFRQ special register. We assume the OS has set up - // the virtual timer properly. - int64_t virtual_timer_value; - asm volatile("mrs %0, cntvct_el0" : "=r"(virtual_timer_value)); - return virtual_timer_value; -#elif defined(__ARM_ARCH) - // V6 is the earliest arch that has a standard cyclecount - // Native Client validator doesn't allow MRC instructions. -#if (__ARM_ARCH >= 6) - uint32_t pmccntr; - uint32_t pmuseren; - uint32_t pmcntenset; - // Read the user mode perf monitor counter access permissions. - asm volatile("mrc p15, 0, %0, c9, c14, 0" : "=r"(pmuseren)); - if (pmuseren & 1) { // Allows reading perfmon counters for user mode code. - asm volatile("mrc p15, 0, %0, c9, c12, 1" : "=r"(pmcntenset)); - if (pmcntenset & 0x80000000ul) { // Is it counting? - asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r"(pmccntr)); - // The counter is set up to count every 64th cycle - return static_cast<int64_t>(pmccntr) * 64; // Should optimize to << 6 - } - } -#endif - struct timeval tv; - gettimeofday(&tv, nullptr); - return static_cast<int64_t>(tv.tv_sec) * 1000000 + tv.tv_usec; -#elif defined(__mips__) || defined(__m68k__) - // mips apparently only allows rdtsc for superusers, so we fall - // back to gettimeofday. It's possible clock_gettime would be better. - struct timeval tv; - gettimeofday(&tv, nullptr); - return static_cast<int64_t>(tv.tv_sec) * 1000000 + tv.tv_usec; -#elif defined(__loongarch__) - struct timeval tv; - gettimeofday(&tv, nullptr); - return static_cast<int64_t>(tv.tv_sec) * 1000000 + tv.tv_usec; -#elif defined(__s390__) // Covers both s390 and s390x. - // Return the CPU clock. - uint64_t tsc; -#if defined(BENCHMARK_OS_ZOS) && defined(COMPILER_IBMXL) - // z/OS XL compiler HLASM syntax. - asm(" stck %0" : "=m"(tsc) : : "cc"); -#else - asm("stck %0" : "=Q"(tsc) : : "cc"); -#endif - return tsc; -#elif defined(__riscv) // RISC-V - // Use RDCYCLE (and RDCYCLEH on riscv32) -#if __riscv_xlen == 32 - uint32_t cycles_lo, cycles_hi0, cycles_hi1; - // This asm also includes the PowerPC overflow handling strategy, as above. - // Implemented in assembly because Clang insisted on branching. - asm volatile( - "rdcycleh %0\n" - "rdcycle %1\n" - "rdcycleh %2\n" - "sub %0, %0, %2\n" - "seqz %0, %0\n" - "sub %0, zero, %0\n" - "and %1, %1, %0\n" - : "=r"(cycles_hi0), "=r"(cycles_lo), "=r"(cycles_hi1)); - return (static_cast<uint64_t>(cycles_hi1) << 32) | cycles_lo; -#else - uint64_t cycles; - asm volatile("rdcycle %0" : "=r"(cycles)); - return cycles; -#endif -#elif defined(__e2k__) || defined(__elbrus__) - struct timeval tv; - gettimeofday(&tv, nullptr); - return static_cast<int64_t>(tv.tv_sec) * 1000000 + tv.tv_usec; -#else -// The soft failover to a generic implementation is automatic only for ARM. -// For other platforms the developer is expected to make an attempt to create -// a fast implementation and use generic version if nothing better is available. -#error You need to define CycleTimer for your OS and CPU -#endif -} -} // end namespace cycleclock -} // end namespace benchmark - -#endif // BENCHMARK_CYCLECLOCK_H_ |