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common: wall_clock: Fix integer overflow with StandardWallClock.

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- Previous optimized impl. resulted in an integer overflow, so revert.
- This is our slow/fallback path that should never be really be used, so the optimization in unimportant.
This commit is contained in:
bunnei 2021-02-19 18:04:23 -08:00
parent 728ee181eb
commit 3acb265c9e
2 changed files with 28 additions and 7 deletions
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15
src/common/wall_clock.cpp
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@ -20,9 +20,7 @@ using base_time_point = std::chrono::time_point<base_timer>;
class StandardWallClock final : public WallClock {
public:
explicit StandardWallClock(u64 emulated_cpu_frequency_, u64 emulated_clock_frequency_)
: WallClock(emulated_cpu_frequency_, emulated_clock_frequency_, false),
emulated_clock_factor{GetFixedPoint64Factor(emulated_clock_frequency, 1000000000)},
emulated_cpu_factor{GetFixedPoint64Factor(emulated_cpu_frequency, 1000000000)} {
: WallClock(emulated_cpu_frequency_, emulated_clock_frequency_, false) {
start_time = base_timer::now();
}
@ -45,11 +43,16 @@ public:
}
u64 GetClockCycles() override {
return MultiplyHigh(GetTimeNS().count(), emulated_clock_factor);
std::chrono::nanoseconds time_now = GetTimeNS();
const u128 temporary =
Common::Multiply64Into128(time_now.count(), emulated_clock_frequency);
return Common::Divide128On32(temporary, 1000000000).first;
}
u64 GetCPUCycles() override {
return MultiplyHigh(GetTimeNS().count(), emulated_cpu_factor);
std::chrono::nanoseconds time_now = GetTimeNS();
const u128 temporary = Common::Multiply64Into128(time_now.count(), emulated_cpu_frequency);
return Common::Divide128On32(temporary, 1000000000).first;
}
void Pause([[maybe_unused]] bool is_paused) override {
@ -58,8 +61,6 @@ public:
private:
base_time_point start_time;
const u64 emulated_clock_factor;
const u64 emulated_cpu_factor;
};
#ifdef ARCHITECTURE_x86_64