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attotime from_hz(double): simpler calculation if more than 1Hz (nw)

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hap 2018-11-07 22:45:16 +01:00
parent 64e4d5eaba
commit ba8aba7ba3
1 changed files with 12 additions and 1 deletions
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13
src/emu/attotime.h
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@ -140,7 +140,18 @@ public:
static attotime from_hz(u32 frequency) { return (frequency > 1) ? attotime(0, HZ_TO_ATTOSECONDS(frequency)) : (frequency == 1) ? attotime(1, 0) : attotime::never; }
static attotime from_hz(int frequency) { return (frequency > 0) ? from_hz(u32(frequency)) : attotime::never; }
static attotime from_hz(const XTAL &xtal) { return (xtal.dvalue() > 1.0) ? attotime(0, HZ_TO_ATTOSECONDS(xtal)) : from_hz(xtal.dvalue()); }
static attotime from_hz(double frequency) { if (frequency > 0.0) { double i, f = modf(1.0 / frequency, &i); return attotime(i, f * ATTOSECONDS_PER_SECOND); } else return attotime::never; }
static attotime from_hz(double frequency)
{
if (frequency > 1.0)
return attotime(0, HZ_TO_ATTOSECONDS(frequency));
else if (frequency > 0.0)
{
double i, f = modf(1.0 / frequency, &i);
return attotime(i, f * ATTOSECONDS_PER_SECOND);
}
else
return attotime::never;
}
// math
attotime &operator+=(const attotime &right);