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-rw-r--r--src/common/x64/cpu_wait.cpp11
1 files changed, 8 insertions, 3 deletions
diff --git a/src/common/x64/cpu_wait.cpp b/src/common/x64/cpu_wait.cpp
index 11b9c4d83..ea16c8490 100644
--- a/src/common/x64/cpu_wait.cpp
+++ b/src/common/x64/cpu_wait.cpp
@@ -26,21 +26,26 @@ constexpr auto PauseCycles = 100'000U;
#ifdef _MSC_VER
__forceinline static void TPAUSE() {
- _tpause(0, FencedRDTSC() + PauseCycles);
+ static constexpr auto RequestC02State = 0U;
+ _tpause(RequestC02State, FencedRDTSC() + PauseCycles);
}
__forceinline static void MWAITX() {
+ static constexpr auto EnableWaitTimeFlag = 1U << 1;
+ static constexpr auto RequestC1State = 0U;
+
// monitor_var should be aligned to a cache line.
alignas(64) u64 monitor_var{};
_mm_monitorx(&monitor_var, 0, 0);
- _mm_mwaitx(/* extensions*/ 2, /* hints */ 0, /* cycles */ PauseCycles);
+ _mm_mwaitx(EnableWaitTimeFlag, RequestC1State, PauseCycles);
}
#else
static void TPAUSE() {
+ static constexpr auto RequestC02State = 0U;
const auto tsc = FencedRDTSC() + PauseCycles;
const auto eax = static_cast<u32>(tsc & 0xFFFFFFFF);
const auto edx = static_cast<u32>(tsc >> 32);
- asm volatile("tpause %0" : : "r"(0), "d"(edx), "a"(eax));
+ asm volatile("tpause %0" : : "r"(RequestC02State), "d"(edx), "a"(eax));
}
#endif