mirror of
https://github.com/yuzu-mirror/yuzu.git
synced 2024-09-07 05:49:08 +01:00
common: wall_clock: Check precision against the emulated CPU and CNTFRQ
In addition to requiring nanosecond precision, using the native clock requires that the hardware TSC has a precision greater than the emulated CPU and its clock counter.
This commit is contained in:
parent
4e766280c4
commit
6267110b69
2 changed files with 12 additions and 8 deletions
|
@ -65,16 +65,20 @@ private:
|
|||
|
||||
#ifdef ARCHITECTURE_x86_64
|
||||
|
||||
std::unique_ptr<WallClock> CreateBestMatchingClock(u32 emulated_cpu_frequency,
|
||||
u32 emulated_clock_frequency) {
|
||||
std::unique_ptr<WallClock> CreateBestMatchingClock(u64 emulated_cpu_frequency,
|
||||
u64 emulated_clock_frequency) {
|
||||
const auto& caps = GetCPUCaps();
|
||||
u64 rtsc_frequency = 0;
|
||||
if (caps.invariant_tsc) {
|
||||
rtsc_frequency = EstimateRDTSCFrequency();
|
||||
}
|
||||
|
||||
// Fallback to StandardWallClock if the hardware TSC does not have nanosecond precision.
|
||||
if (rtsc_frequency <= WallClock::NS_RATIO) {
|
||||
// Fallback to StandardWallClock if the hardware TSC does not have the precision greater than:
|
||||
// - A nanosecond
|
||||
// - The emulated CPU frequency
|
||||
// - The emulated clock counter frequency (CNTFRQ)
|
||||
if (rtsc_frequency <= WallClock::NS_RATIO || rtsc_frequency <= emulated_cpu_frequency ||
|
||||
rtsc_frequency <= emulated_clock_frequency) {
|
||||
return std::make_unique<StandardWallClock>(emulated_cpu_frequency,
|
||||
emulated_clock_frequency);
|
||||
} else {
|
||||
|
@ -85,8 +89,8 @@ std::unique_ptr<WallClock> CreateBestMatchingClock(u32 emulated_cpu_frequency,
|
|||
|
||||
#else
|
||||
|
||||
std::unique_ptr<WallClock> CreateBestMatchingClock(u32 emulated_cpu_frequency,
|
||||
u32 emulated_clock_frequency) {
|
||||
std::unique_ptr<WallClock> CreateBestMatchingClock(u64 emulated_cpu_frequency,
|
||||
u64 emulated_clock_frequency) {
|
||||
return std::make_unique<StandardWallClock>(emulated_cpu_frequency, emulated_clock_frequency);
|
||||
}
|
||||
|
||||
|
|
|
@ -53,7 +53,7 @@ private:
|
|||
bool is_native;
|
||||
};
|
||||
|
||||
[[nodiscard]] std::unique_ptr<WallClock> CreateBestMatchingClock(u32 emulated_cpu_frequency,
|
||||
u32 emulated_clock_frequency);
|
||||
[[nodiscard]] std::unique_ptr<WallClock> CreateBestMatchingClock(u64 emulated_cpu_frequency,
|
||||
u64 emulated_clock_frequency);
|
||||
|
||||
} // namespace Common
|
||||
|
|
Loading…
Reference in a new issue