26-Nov-2013 09:06, Daniel Murphy пишет:
"Dmitry Olshansky" <dmitry.o...@gmail.com> wrote in message
news:l6tfm8$2hnj$1...@digitalmars.com...
Can't it just check for the real part being exactly zero and special- case
multiplication for that?
There is no such thing as exactly zero in floating point. Only -0 and +0.
Well, let it be magnitude, "exactly" implies as good zero test as we
need. I'm still of the opinion that a few predictable branches like
`if(rhs.re.isZero)` won't kill it.
Regardless, the point is that built-ins hardly help here at all as you
may just as well get an "exactly" 0+1i for some complex computation, and
the result won't suddenly change type to i{real,double,float}.
--
Dmitry Olshansky
