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time: Use compile time division for TimeSpanType conversion

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This commit is contained in:
Morph 2023-04-23 00:09:49 -04:00
parent 8e56a84566
commit 9dcc7bde8b
5 changed files with 15 additions and 11 deletions
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13
src/core/hle/service/time/clock_types.h
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@ -3,6 +3,8 @@
#pragma once
#include <ratio>
#include "common/common_funcs.h"
#include "common/common_types.h"
#include "common/uuid.h"
@ -74,18 +76,19 @@ static_assert(std::is_trivially_copyable_v<ContinuousAdjustmentTimePoint>,
/// https://switchbrew.org/wiki/Glue_services#TimeSpanType
struct TimeSpanType {
s64 nanoseconds{};
static constexpr s64 ns_per_second{1000000000ULL};
s64 ToSeconds() const {
return nanoseconds / ns_per_second;
return nanoseconds / std::nano::den;
}
static TimeSpanType FromSeconds(s64 seconds) {
return {seconds * ns_per_second};
return {seconds * std::nano::den};
}
static TimeSpanType FromTicks(u64 ticks, u64 frequency) {
return FromSeconds(static_cast<s64>(ticks) / static_cast<s64>(frequency));
template <u64 Frequency>
static TimeSpanType FromTicks(u64 ticks) {
using TicksToNSRatio = std::ratio<std::nano::den, Frequency>;
return {static_cast<s64>(ticks * TicksToNSRatio::num / TicksToNSRatio::den)};
}
};
static_assert(sizeof(TimeSpanType) == 8, "TimeSpanType is incorrect size");

2
src/core/hle/service/time/standard_steady_clock_core.cpp
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@ -10,7 +10,7 @@ namespace Service::Time::Clock {
TimeSpanType StandardSteadyClockCore::GetCurrentRawTimePoint(Core::System& system) {
const TimeSpanType ticks_time_span{
TimeSpanType::FromTicks(system.CoreTiming().GetClockTicks(), Core::Hardware::CNTFREQ)};
TimeSpanType::FromTicks<Core::Hardware::CNTFREQ>(system.CoreTiming().GetClockTicks())};
TimeSpanType raw_time_point{setup_value.nanoseconds + ticks_time_span.nanoseconds};
if (raw_time_point.nanoseconds < cached_raw_time_point.nanoseconds) {

2
src/core/hle/service/time/tick_based_steady_clock_core.cpp
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@ -10,7 +10,7 @@ namespace Service::Time::Clock {
SteadyClockTimePoint TickBasedSteadyClockCore::GetTimePoint(Core::System& system) {
const TimeSpanType ticks_time_span{
TimeSpanType::FromTicks(system.CoreTiming().GetClockTicks(), Core::Hardware::CNTFREQ)};
TimeSpanType::FromTicks<Core::Hardware::CNTFREQ>(system.CoreTiming().GetClockTicks())};
return {ticks_time_span.ToSeconds(), GetClockSourceId()};
}

4
src/core/hle/service/time/time.cpp
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@ -240,8 +240,8 @@ void Module::Interface::CalculateMonotonicSystemClockBaseTimePoint(HLERequestCon
const auto current_time_point{steady_clock_core.GetCurrentTimePoint(system)};
if (current_time_point.clock_source_id == context.steady_time_point.clock_source_id) {
const auto ticks{Clock::TimeSpanType::FromTicks(system.CoreTiming().GetClockTicks(),
Core::Hardware::CNTFREQ)};
const auto ticks{Clock::TimeSpanType::FromTicks<Core::Hardware::CNTFREQ>(
system.CoreTiming().GetClockTicks())};
const s64 base_time_point{context.offset + current_time_point.time_point -
ticks.ToSeconds()};
IPC::ResponseBuilder rb{ctx, (sizeof(s64) / 4) + 2};

5
src/core/hle/service/time/time_sharedmemory.cpp
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@ -21,8 +21,9 @@ SharedMemory::~SharedMemory() = default;
void SharedMemory::SetupStandardSteadyClock(const Common::UUID& clock_source_id,
Clock::TimeSpanType current_time_point) {
const Clock::TimeSpanType ticks_time_span{Clock::TimeSpanType::FromTicks(
system.CoreTiming().GetClockTicks(), Core::Hardware::CNTFREQ)};
const Clock::TimeSpanType ticks_time_span{
Clock::TimeSpanType::FromTicks<Core::Hardware::CNTFREQ>(
system.CoreTiming().GetClockTicks())};
const Clock::SteadyClockContext context{
static_cast<u64>(current_time_point.nanoseconds - ticks_time_span.nanoseconds),
clock_source_id};