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[windows] return x86 microsleep for mingw only 

Signed-off-by: lizzie <lizzie@eden-emu.dev>
This commit is contained in:
lizzie 2026-02-14 16:13:27 +00:00
parent 19e2dba35a
commit 0f71f7e249
1 changed files with 33 additions and 2 deletions
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35
src/core/core_timing.cpp
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@ -282,8 +282,39 @@ void CoreTiming::ThreadLoop() {
const auto next_time = Advance();
if (next_time) {
// There are more events left in the queue, wait until the next event.
auto wait_time = *next_time - GetGlobalTimeNs().count();
event.WaitFor(std::chrono::nanoseconds(wait_time));
if (auto wait_time = *next_time - GetGlobalTimeNs().count(); wait_time > 0) {
#if defined(_WIN32) && defined(ARCHITECTURE_x86_64) && defined(__MINGW64__)
while (!paused && !event.IsSet() && wait_time > 0) {
wait_time = *next_time - GetGlobalTimeNs().count();
if (wait_time >= timer_resolution_ns) {
Common::Windows::SleepForOneTick();
} else {
auto const& caps = 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);
asm volatile("tpause %0" : : "r"(RequestC02State), "d"(edx), "a"(eax));
} else if (caps.monitorx) {
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{};
asm volatile("monitorx" : : "a"(&monitor_var), "c"(0), "d"(0));
asm volatile("mwaitx" : : "a"(RequestC1State), "b"(PauseCycles), "c"(EnableWaitTimeFlag));
} else {
std::this_thread::yield();
}
}
}
if (event.IsSet()) {
event.Reset();
}
#else
event.WaitFor(std::chrono::nanoseconds(wait_time));
}
#endif
} else {
// Queue is empty, wait until another event is scheduled and signals us to
// continue.