attotime &attotime::operator*=(UINT32 factor)
{
// if one of the items is attotime::never, return attotime::never
if (seconds >= ATTOTIME_MAX_SECONDS)
return *this = never;
// 0 times anything is zero
if (factor == 0)
return *this = zero;
// split attoseconds into upper and lower halves which fit into 32 bits
UINT32 attolo;
UINT32 attohi = divu_64x32_rem(attoseconds, ATTOSECONDS_PER_SECOND_SQRT, &attolo);
// scale the lower half, then split into high/low parts
UINT64 temp = mulu_32x32(attolo, factor);
UINT32 reslo;
temp = divu_64x32_rem(temp, ATTOSECONDS_PER_SECOND_SQRT, &reslo);
// scale the upper half, then split into high/low parts
temp += mulu_32x32(attohi, factor);
UINT32 reshi;
temp = divu_64x32_rem(temp, ATTOSECONDS_PER_SECOND_SQRT, &reshi);
// scale the seconds
temp += mulu_32x32(seconds, factor);
if (temp >= ATTOTIME_MAX_SECONDS)
return *this = never;
// build the result
seconds = temp;
attoseconds = (attoseconds_t)reslo + mul_32x32(reshi, ATTOSECONDS_PER_SECOND_SQRT);
return *this;
}
attotime attotime_mul(attotime _time1, UINT32 factor)
{
UINT32 attolo, attohi, reslo, reshi;
UINT64 temp;
/* if one of the items is attotime_never, return attotime_never */
if (_time1.seconds >= ATTOTIME_MAX_SECONDS)
return attotime_never;
/* 0 times anything is zero */
if (factor == 0)
return attotime_zero;
/* split attoseconds into upper and lower halves which fit into 32 bits */
attohi = divu_64x32_rem(_time1.attoseconds, ATTOSECONDS_PER_SECOND_SQRT, &attolo);
/* scale the lower half, then split into high/low parts */
temp = mulu_32x32(attolo, factor);
temp = divu_64x32_rem(temp, ATTOSECONDS_PER_SECOND_SQRT, &reslo);
/* scale the upper half, then split into high/low parts */
temp += mulu_32x32(attohi, factor);
temp = divu_64x32_rem(temp, ATTOSECONDS_PER_SECOND_SQRT, &reshi);
/* scale the seconds */
temp += mulu_32x32(_time1.seconds, factor);
if (temp >= ATTOTIME_MAX_SECONDS)
return attotime_never;
/* build the result */
return attotime_make(temp, (attoseconds_t)reslo + mul_32x32(reshi, ATTOSECONDS_PER_SECOND_SQRT));
}
attotime attotime_div(attotime _time1, UINT32 factor)
{
UINT32 attolo, attohi, reshi, reslo, remainder;
attotime result;
UINT64 temp;
/* if one of the items is attotime_never, return attotime_never */
if (_time1.seconds >= ATTOTIME_MAX_SECONDS)
return attotime_never;
/* ignore divide by zero */
if (factor == 0)
return _time1;
/* split attoseconds into upper and lower halves which fit into 32 bits */
attohi = divu_64x32_rem(_time1.attoseconds, ATTOSECONDS_PER_SECOND_SQRT, &attolo);
/* divide the seconds and get the remainder */
result.seconds = divu_64x32_rem(_time1.seconds, factor, &remainder);
/* combine the upper half of attoseconds with the remainder and divide that */
temp = (INT64)attohi + mulu_32x32(remainder, ATTOSECONDS_PER_SECOND_SQRT);
reshi = divu_64x32_rem(temp, factor, &remainder);
/* combine the lower half of attoseconds with the remainder and divide that */
temp = attolo + mulu_32x32(remainder, ATTOSECONDS_PER_SECOND_SQRT);
reslo = divu_64x32_rem(temp, factor, &remainder);
/* round based on the remainder */
result.attoseconds = (attoseconds_t)reslo + mulu_32x32(reshi, ATTOSECONDS_PER_SECOND_SQRT);
if (remainder >= factor / 2)
if (++result.attoseconds >= ATTOSECONDS_PER_SECOND)
{
result.attoseconds = 0;
result.seconds++;
}
return result;
}
attotime &attotime::operator/=(UINT32 factor)
{
// if one of the items is attotime::never, return attotime::never
if (seconds >= ATTOTIME_MAX_SECONDS)
return *this = never;
// ignore divide by zero
if (factor == 0)
return *this;
// split attoseconds into upper and lower halves which fit into 32 bits
UINT32 attolo;
UINT32 attohi = divu_64x32_rem(attoseconds, ATTOSECONDS_PER_SECOND_SQRT, &attolo);
// divide the seconds and get the remainder
UINT32 remainder;
seconds = divu_64x32_rem(seconds, factor, &remainder);
// combine the upper half of attoseconds with the remainder and divide that
UINT64 temp = (INT64)attohi + mulu_32x32(remainder, ATTOSECONDS_PER_SECOND_SQRT);
UINT32 reshi = divu_64x32_rem(temp, factor, &remainder);
// combine the lower half of attoseconds with the remainder and divide that
temp = attolo + mulu_32x32(remainder, ATTOSECONDS_PER_SECOND_SQRT);
UINT32 reslo = divu_64x32_rem(temp, factor, &remainder);
// round based on the remainder
attoseconds = (attoseconds_t)reslo + mulu_32x32(reshi, ATTOSECONDS_PER_SECOND_SQRT);
if (remainder >= factor / 2)
if (++attoseconds >= ATTOSECONDS_PER_SECOND)
{
attoseconds = 0;
seconds++;
}
return *this;
}
