complex arithmetic in gcc (and various standards)

[Paolo Carlini]

Hi Jan,

>	Hello,
>
>I was recently bitten by gcc's handling of complex multiplication. My program 
>is in C++, but since std::complex<T> uses C99's complex types, my questions 
>below apply to C as well.
>
I only want to say more explicitely that apparently both C and C++ are 
affected, and in *inconsistent* ways wrt optimization. In other terms, 
it looks like the front-ends are also involved: e.g., compare the 
original testcase in libstdc++/28408 vs the C version I added in Comment #7.

Paolo.