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Fix system time wraparound

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Implement utils::udiv128, utils::div128
This commit is contained in:
Nekotekina 2019-08-30 19:47:31 +03:00
parent 7f99de36c1
commit 81a110f346
2 changed files with 60 additions and 3 deletions
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11
rpcs3/Emu/Cell/lv2/sys_time.cpp
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@ -3,6 +3,7 @@
#include "Emu/System.h"
#include "Emu/Cell/ErrorCodes.h"
#include "Utilities/asm.h"
#ifdef _WIN32
@ -196,8 +197,12 @@ s32 sys_time_get_current_time(vm::ptr<s64> sec, vm::ptr<s64> nsec)
LARGE_INTEGER count;
verify(HERE), QueryPerformanceCounter(&count);
// get time difference in nanoseconds
const u64 diff = (count.QuadPart - s_time_aux_info.start_time) * 1000000000ull / s_time_aux_info.perf_freq;
const u64 diff_base = count.QuadPart - s_time_aux_info.start_time;
// Get time difference in nanoseconds (using 128 bit accumulator)
const u64 diff_sl = diff_base * 1000000000ull;
const u64 diff_sh = utils::umulh64(diff_base, 1000000000ull);
const u64 diff = utils::udiv128(diff_sh, diff_sl, s_time_aux_info.perf_freq);
// get time since Epoch in nanoseconds
const u64 time = s_time_aux_info.start_ftime * 100u + (diff * g_cfg.core.clocks_scale / 100u);
@ -237,7 +242,7 @@ s32 sys_time_get_current_time(vm::ptr<s64> sec, vm::ptr<s64> nsec)
{
// Correct value if borrow encountered
tv_sec -= 1;
tv_nsec = 1'000'000'000ull - (stv_nsec - tv_nsec);
tv_nsec = 1'000'000'000ull - (stv_nsec - tv_nsec);
}
else
{