complex numbers

[Paolo Carlini]

> As you mentinon it if have missed the specilization at the end of
> std_complex.h. Sorry. I still think that we should have and other
> implementation for complex<floating_point>, but I cannot change the code
> of __complex__ T in the complier.

Interestingly, it looks like the discussed improved algorithm is
*already* implemented, just not used!

Have a look to expand_complex_division in gcc/tree-complex.c, then
gcc/toplev.c for flag_complex_divide_method.

Andreas, just for curiosity, are you willing to rebuild your gcc
with flag_complex_divide_method = 1 and report???

Thanks,
Paolo.