[Bug middle-end/22347] New: Return value register not correctly computed for indirect function call

[rguenth at gcc dot gnu dot org]

double __attribute__((sseregparm)) mysin(double);
double __attribute__((sseregparm)) (*mysinfp)(double) = mysin;
double bar(double x)
{
  return mysinfp(x);
}

results in mysinfp as sibling call inside bar, wrongly thinking we
return on the FP stack from mysinfp.  This may happen in other
cases / on other targets in similar situations, but I couldn't come
up with a testcase that does not use sseregparm to change the
return value ABI.

rth kindly suggested how to possibly fix this:
http://gcc.gnu.org/ml/gcc/2005-07/msg00255.html

-- 
           Summary: Return value register not correctly computed for
                    indirect function call
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P2
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rguenth at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org
GCC target triplet: i686-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22347