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Defend clocks_to_attotime and attotime_to_clocks against the possibility of the device clock being 0 (nw)

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This commit is contained in:
AJR 2017-04-21 14:33:35 -04:00
parent 9f12134990
commit a0bf95bc4d
1 changed files with 7 additions and 2 deletions
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9
src/emu/device.cpp
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@ -360,7 +360,9 @@ void device_t::calculate_derived_clock()
attotime device_t::clocks_to_attotime(u64 numclocks) const
{
if (numclocks < m_clock)
if (m_clock == 0)
return attotime::never;
else if (numclocks < m_clock)
return attotime(0, numclocks * m_attoseconds_per_clock);
else
{
@ -378,7 +380,10 @@ attotime device_t::clocks_to_attotime(u64 numclocks) const
u64 device_t::attotime_to_clocks(const attotime &duration) const
{
return mulu_32x32(duration.seconds(), m_clock) + u64(duration.attoseconds()) / u64(m_attoseconds_per_clock);
if (m_clock == 0)
return 0;
else
return mulu_32x32(duration.seconds(), m_clock) + u64(duration.attoseconds()) / u64(m_attoseconds_per_clock);
}