time: making IsZero more efficient #76001
Description
In time, for any values of wall and ext, the results of IsZero2 and IsZero are exactly the same, but IsZero2 is simpler and more efficient. Can IsZero2 replace IsZero?
func (t Time) IsZero2() bool {
return t.wall == 0 && t.ext == 0
}
Line 262 in 29d43df
func (t Time) IsZero() bool {
return t.sec() == 0 && t.nsec() == 0
}
// nsec returns the time's nanoseconds.
func (t *Time) nsec() int32 {
return int32(t.wall & nsecMask)
}
// sec returns the time's seconds since Jan 1 year 1.
func (t *Time) sec() int64 {
if t.wall&hasMonotonic != 0 {
return wallToInternal + int64(t.wall<<1>>(nsecShift+1))
}
return t.ext
}