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Fix scheduler overflow when a device executes for more cycles than there are in a second

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This commit is contained in:
AJR 2017-06-27 12:36:30 -04:00
parent 2ea5c18289
commit 3387442694
1 changed files with 9 additions and 1 deletions
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10
src/emu/schedule.cpp
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@ -498,7 +498,15 @@ void device_scheduler::timeslice()
exec->m_totalcycles += ran;
// update the local time for this CPU
attotime deltatime(0, exec->m_attoseconds_per_cycle * ran);
attotime deltatime;
if (ran < exec->m_cycles_per_second)
deltatime = attotime(0, exec->m_attoseconds_per_cycle * ran);
else
{
u32 remainder;
s32 secs = divu_64x32_rem(ran, exec->m_cycles_per_second, &remainder);
deltatime = attotime(secs, u64(remainder) * exec->m_attoseconds_per_cycle);
}
assert(deltatime >= attotime::zero);
exec->m_localtime += deltatime;
LOG((" %d ran, %d total, time = %s\n", ran, s32(exec->m_totalcycles), exec->m_localtime.as_string(PRECISION)));