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This commit is contained in:
lizzie 2026-02-15 01:00:49 +00:00
parent ccd132be8f
commit 8b11016bec
1 changed files with 10 additions and 4 deletions
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14
src/core/core_timing.cpp
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@ -294,12 +294,18 @@ void CoreTiming::ThreadLoop() {
if (wait_time >= timer_resolution_ns) {
Common::Windows::SleepForOneTick();
} else {
auto const& caps = GetCPUCaps();
// 100,000 cycles is a reasonable amount of time to wait to save on CPU resources.
// For reference:
// At 1 GHz, 100K cycles is 100us
// At 2 GHz, 100K cycles is 50us
// At 4 GHz, 100K cycles is 25us
constexpr auto PauseCycles = 100'000U;
auto const& caps = Common::GetCPUCaps();
if (caps.waitpkg) {
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);
const auto tsc = Common::X64::FencedRDTSC() + PauseCycles;
const auto eax = u32(tsc & 0xFFFFFFFF);
const auto edx = u32(tsc >> 32);
asm volatile("tpause %0" : : "r"(RequestC02State), "d"(edx), "a"(eax));
} else if (caps.monitorx) {
static constexpr auto EnableWaitTimeFlag = 1U << 1;