[Bug c/16446] New: Irix calling conventions for complex numbers

["billingd at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

It is likely that the calling conventions for complex numbers are wrong for 
mips-sgi-irix6.5.

Here is my test program.  It is modelled on some of the test cases
in gcc.dg.  The fact that the output is (1.000,0.000) makes me wonder.
Host is an Origin 300 running IRIX 6.5.22m

#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));
}


Built with 2004-07-0x HEAD 

/disk4/billingd/obj/gcc-j/gcc/xgcc -B/disk4/billingd/obj/gcc-j/gcc 
  -I/disk4/billingd/obj/gcc-j/gcc/include -o use_cpow use_cpow.c -lm

Output is:

2.000000        3.000000
1.000000        0.000000

Comment from Richard Sandiford is that "we're mishandling the argument
passing side of things (as opposed to the return value)."

See the discussion:
http://gcc.gnu.org/ml/gcc/2004-07/msg00300.html
http://gcc.gnu.org/ml/gcc/2004-07/msg00366.html
http://gcc.gnu.org/ml/gcc/2004-07/msg00369.html

-- 
           Summary: Irix calling conventions for complex numbers
           Product: gcc
           Version: 3.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: billingd at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: mips-sgi-irix6.5
  GCC host triplet: mips-sgi-irix6.5
GCC target triplet: mips-sgi-irix6.5
OtherBugsDependingO 16322
             nThis:


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16446