Re: Irix calling conventions for complex numbers

[Richard Sandiford <rsandifo at redhat dot com>]

David, thanks for all your work on this!

I should probably mention that it's been very difficult for me test to
_Complex stuff on irix.  For one thing, I've only got access to 6.5.12m,
which doesn't seem to provide many of the complex libm functions.  Even a
simple testcase like this:

> #include <stdio.h>
>
> extern double creal (double _Complex);
> extern double cimag (double _Complex);
> extern double _Complex cpow (double _Complex, double _Complex cpow);
>
> int main()
> {
>   _Complex double t, t1;
>   t = 2 + 3.0i;
>   t1 = cpow (t, 2);
>   printf ("%f\t%f\n", creal (t),  cimag (t));
>   printf ("%f\t%f\n", creal (t1), cimag (t1));
> }

fails to compile for me due to lack of cpow() in libm.

Also, the version of MIPSpro I use isn't much help for compat.exp-style
testing since it (a) doesn't include the Fortran compiler and (b) doesn't
handle _Complex properly.  Any attempt to use _Complex results in:

### Compiler Error during Front End Driver phase:
### Invalid machine type BETYPE_0 in Make_Complex
cc INTERNAL ERROR:  /usr/lib32/cmplrs/fec returned non-zero status 1

But I suspect from your description that we're mishandling the argument
passing side of things (as opposed to the return value).  I'll try to
look into it soon.

Richard