diff options
Diffstat (limited to 'src/core/core_timing_util.cpp')
-rw-r--r-- | src/core/core_timing_util.cpp | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/src/core/core_timing_util.cpp b/src/core/core_timing_util.cpp new file mode 100644 index 000000000..73dea4edb --- /dev/null +++ b/src/core/core_timing_util.cpp @@ -0,0 +1,63 @@ +// Copyright 2008 Dolphin Emulator Project / 2017 Citra Emulator Project +// Licensed under GPLv2+ +// Refer to the license.txt file included. + +#include "core/core_timing_util.h" + +#include <cinttypes> +#include <limits> +#include "common/logging/log.h" + +namespace CoreTiming { + +constexpr u64 MAX_VALUE_TO_MULTIPLY = std::numeric_limits<s64>::max() / BASE_CLOCK_RATE; + +s64 usToCycles(s64 us) { + if (us / 1000000 > MAX_VALUE_TO_MULTIPLY) { + LOG_ERROR(Core_Timing, "Integer overflow, use max value"); + return std::numeric_limits<s64>::max(); + } + if (us > MAX_VALUE_TO_MULTIPLY) { + LOG_DEBUG(Core_Timing, "Time very big, do rounding"); + return BASE_CLOCK_RATE * (us / 1000000); + } + return (BASE_CLOCK_RATE * us) / 1000000; +} + +s64 usToCycles(u64 us) { + if (us / 1000000 > MAX_VALUE_TO_MULTIPLY) { + LOG_ERROR(Core_Timing, "Integer overflow, use max value"); + return std::numeric_limits<s64>::max(); + } + if (us > MAX_VALUE_TO_MULTIPLY) { + LOG_DEBUG(Core_Timing, "Time very big, do rounding"); + return BASE_CLOCK_RATE * static_cast<s64>(us / 1000000); + } + return (BASE_CLOCK_RATE * static_cast<s64>(us)) / 1000000; +} + +s64 nsToCycles(s64 ns) { + if (ns / 1000000000 > MAX_VALUE_TO_MULTIPLY) { + LOG_ERROR(Core_Timing, "Integer overflow, use max value"); + return std::numeric_limits<s64>::max(); + } + if (ns > MAX_VALUE_TO_MULTIPLY) { + LOG_DEBUG(Core_Timing, "Time very big, do rounding"); + return BASE_CLOCK_RATE * (ns / 1000000000); + } + return (BASE_CLOCK_RATE * ns) / 1000000000; +} + +s64 nsToCycles(u64 ns) { + if (ns / 1000000000 > MAX_VALUE_TO_MULTIPLY) { + LOG_ERROR(Core_Timing, "Integer overflow, use max value"); + return std::numeric_limits<s64>::max(); + } + if (ns > MAX_VALUE_TO_MULTIPLY) { + LOG_DEBUG(Core_Timing, "Time very big, do rounding"); + return BASE_CLOCK_RATE * (static_cast<s64>(ns) / 1000000000); + } + return (BASE_CLOCK_RATE * static_cast<s64>(ns)) / 1000000000; +} + +} // namespace CoreTiming |