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Re: complex arithmetic in gcc (and various standards)
Hi Gaby
| > My question was a slightly different one. To me it is not clear whether the
| > standard allows the treatment of (r,0) as r in complex operations. For
| > example: is it allowed to handle (r,0)*(x,y) as r*(x,y)?
|
| I don't think so; at least, it might affect negative 0.
Hmm, how?
I'm not sure if the following is exactly Joseph' point, but I'd like to
know your opinion about it anyway: if you look to Comment #19 in the
audit trail of PR 28408, I noticed that, due to the rule about signed
zero (with default rounding):
(+0) + (-0) = +0
the result of the "same" multiplication considered as complex * complex
(vs complex * real) has a different sign for the zero imaginary component.
Paolo.