func (z *Big) mulBig(x, y *Big) *Big {
scale, ok := checked.Add32(x.scale, y.scale)
if !ok {
z.form = inf
return z
}
z.mantissa.Mul(&x.mantissa, &y.mantissa)
z.compact = c.Inflated
z.scale = scale
z.form = finite
return z
}
func (z *Big) mulCompact(x, y *Big) *Big {
scale, ok := checked.Add32(x.scale, y.scale)
if !ok {
z.form = inf
return z
}
prod, ok := checked.Mul(x.compact, y.compact)
if ok {
z.compact = prod
} else {
z.mantissa.Mul(big.NewInt(x.compact), big.NewInt(y.compact))
z.compact = c.Inflated
}
z.scale = scale
z.form = finite
return z
}
func (z *Big) mulHalf(comp, non *Big) *Big {
if comp.isInflated() {
panic("decimal.Mul (bug) comp.isInflated() == true")
}
if comp.scale == non.scale {
scale, ok := checked.Add32(comp.scale, non.scale)
if !ok {
z.form = inf
return z
}
z.mantissa.Mul(big.NewInt(comp.compact), &non.mantissa)
z.compact = c.Inflated
z.scale = scale
z.form = finite
return z
}
return z.mulBig(&Big{
mantissa: *big.NewInt(comp.compact),
scale: comp.scale,
}, non)
}