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x64: cpu_wait: Remove magic values

This commit is contained in:
Morph 2023-06-28 01:19:41 -04:00
parent 3d868baaa4
commit 2b68a3cbbf
1 changed files with 8 additions and 3 deletions
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11
src/common/x64/cpu_wait.cpp
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@ -26,21 +26,26 @@ constexpr auto PauseCycles = 100'000U;
#ifdef _MSC_VER #ifdef _MSC_VER
__forceinline static void TPAUSE() { __forceinline static void TPAUSE() {
_tpause(0, FencedRDTSC() + PauseCycles); static constexpr auto RequestC02State = 0U;
_tpause(RequestC02State, FencedRDTSC() + PauseCycles);
} }
__forceinline static void MWAITX() { __forceinline static void MWAITX() {
static constexpr auto EnableWaitTimeFlag = 1U << 1;
static constexpr auto RequestC1State = 0U;
// monitor_var should be aligned to a cache line. // monitor_var should be aligned to a cache line.
alignas(64) u64 monitor_var{}; alignas(64) u64 monitor_var{};
_mm_monitorx(&monitor_var, 0, 0); _mm_monitorx(&monitor_var, 0, 0);
_mm_mwaitx(/* extensions*/ 2, /* hints */ 0, /* cycles */ PauseCycles); _mm_mwaitx(EnableWaitTimeFlag, RequestC1State, PauseCycles);
} }
#else #else
static void TPAUSE() { static void TPAUSE() {
static constexpr auto RequestC02State = 0U;
const auto tsc = FencedRDTSC() + PauseCycles; const auto tsc = FencedRDTSC() + PauseCycles;
const auto eax = static_cast<u32>(tsc & 0xFFFFFFFF); const auto eax = static_cast<u32>(tsc & 0xFFFFFFFF);
const auto edx = static_cast<u32>(tsc >> 32); 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 #endif