diff options
| author | Michał Janiszewski <janisozaur@users.noreply.github.com> | 2021-02-12 11:30:26 +0100 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2021-02-12 13:30:26 +0300 |
| commit | ea5a5bbff491fd625c6e3458f6edd680b8bd5452 (patch) | |
| tree | 2802b5552f8f79850d2c4c6bd9c050d0a398d794 | |
| parent | 8df87f6c879cbcabd17c5cfcec7b89687df36953 (diff) | |
| download | google-benchmark-ea5a5bbff491fd625c6e3458f6edd680b8bd5452.tar.gz | |
Add MSVC ARM64 support for reading clocks (#1052)
Lacks CMake support, see https://github.com/google/benchmark/pull/1090
| -rw-r--r-- | src/cycleclock.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/src/cycleclock.h b/src/cycleclock.h index 89de86f..6843b69 100644 --- a/src/cycleclock.h +++ b/src/cycleclock.h @@ -36,7 +36,7 @@ // 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) +#if defined(COMPILER_MSVC) && !defined(_M_IX86) && !defined(_M_ARM64) extern "C" uint64_t __rdtsc(); #pragma intrinsic(__rdtsc) #endif @@ -114,6 +114,12 @@ inline BENCHMARK_ALWAYS_INLINE int64_t Now() { // 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) |