diff options
Diffstat (limited to 'src/time/gpu/nanosleep.cpp')
| -rw-r--r-- | src/time/gpu/nanosleep.cpp | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/src/time/gpu/nanosleep.cpp b/src/time/gpu/nanosleep.cpp index e84fe622100e..dd669ff46c75 100644 --- a/src/time/gpu/nanosleep.cpp +++ b/src/time/gpu/nanosleep.cpp @@ -12,29 +12,31 @@ namespace LIBC_NAMESPACE { -constexpr uint64_t TICKS_PER_NS = 1000000000UL; +constexpr uint64_t TICKS_PER_SEC = 1000000000UL; LLVM_LIBC_FUNCTION(int, nanosleep, (const struct timespec *req, struct timespec *rem)) { if (!GPU_CLOCKS_PER_SEC || !req) return -1; - uint64_t nsecs = req->tv_nsec + req->tv_sec * TICKS_PER_NS; + uint64_t nsecs = req->tv_nsec + req->tv_sec * TICKS_PER_SEC; + uint64_t tick_rate = TICKS_PER_SEC / GPU_CLOCKS_PER_SEC; uint64_t start = gpu::fixed_frequency_clock(); -#if defined(LIBC_TARGET_ARCH_IS_NVPTX) && __CUDA_ARCH__ >= 700 - uint64_t end = start + nsecs / (TICKS_PER_NS / GPU_CLOCKS_PER_SEC); +#if defined(LIBC_TARGET_ARCH_IS_NVPTX) + uint64_t end = start + (nsecs + tick_rate - 1) / tick_rate; uint64_t cur = gpu::fixed_frequency_clock(); // The NVPTX architecture supports sleeping and guaruntees the actual time // slept will be somewhere between zero and twice the requested amount. Here // we will sleep again if we undershot the time. while (cur < end) { - __nvvm_nanosleep(static_cast<uint32_t>(nsecs)); + if (__nvvm_reflect("__CUDA_ARCH") >= 700) + LIBC_INLINE_ASM("nanosleep.u32 %0;" ::"r"(nsecs)); cur = gpu::fixed_frequency_clock(); nsecs -= nsecs > cur - start ? cur - start : 0; } #elif defined(LIBC_TARGET_ARCH_IS_AMDGPU) - uint64_t end = start + nsecs / (TICKS_PER_NS / GPU_CLOCKS_PER_SEC); + uint64_t end = start + (nsecs + tick_rate - 1) / tick_rate; uint64_t cur = gpu::fixed_frequency_clock(); // The AMDGPU architecture does not provide a sleep implementation with a // known delay so we simply repeatedly sleep with a large value of ~960 clock @@ -56,11 +58,11 @@ LLVM_LIBC_FUNCTION(int, nanosleep, // Check to make sure we slept for at least the desired duration and set the // remaining time if not. - uint64_t elapsed = (stop - start) * (TICKS_PER_NS / GPU_CLOCKS_PER_SEC); + uint64_t elapsed = (stop - start) * tick_rate; if (elapsed < nsecs) { if (rem) { - rem->tv_sec = (nsecs - elapsed) / TICKS_PER_NS; - rem->tv_nsec = (nsecs - elapsed) % TICKS_PER_NS; + rem->tv_sec = (nsecs - elapsed) / TICKS_PER_SEC; + rem->tv_nsec = (nsecs - elapsed) % TICKS_PER_SEC; } return -1; } |